Get 60 days free from Headspace from https://headspace-web.app.link/e/SUM or use voucher code STANDUPMATHS Come and see the previews for my new untitled stand-up show on 10 February, 24 March and 23 June. Grab tickets now: https://festivalofthespokennerd.com/tickets/ Check out content from folk who bravely contributed data to the Schmatt Pain Index: Mark Bowler: https://www.youtube.com/@aFieldBiologist - find out how we captured these insect in his latest video: https://youtu.be/ZACS1ck9n0c Michael and Dani: https://www.instagram.com/the_wayfinders_/ Hugo Cliff: https://www.instagram.com/hugocliff_rainforest/ Greg Foot: https://www.instagram.com/gregfoot/ And Greg is doing a new schools talk "Rainforest Lab" https://www.gregfoot.com/talks Thanks to Rainforest Expeditions for inviting us to visit their Research Centres in Peru and facilitating us getting stung by things in a safe environment. Read more about the research being done in the rainforest by Wired Amazon. They take science research volunteers as well as offering paid trips. https://www.wiredamazon.com/ https://www.youtube.com/@RainforestExpeditions https://instagram.com/rainforestexpeditions/ Huge thanks to my Patreon supporters. Their support never stings. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced and drone piloted by Nicole Jacobus Animations by William Marler Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Learn more about Jane Street’s internship opportunities: https://jane-st.co/SUM-internships Sign up to patreon to get a unique christmas card! https://www.patreon.com/standupmaths A Mathematical Secret Santa Protocol by Katie Steckles https://www.youtube.com/watch?v=ehRTbNIr6-E This is the math stackexchange discussion: https://math.stackexchange.com/a/2896914 The Problems with Secret Santa, Hannah fry on Numberphile. https://www.youtube.com/watch?v=5kC5k5QBqcc Thanks to everyone who took part! Here they are in the same random order as the emails went around. Not everyone is active on youtube so you may need to google some people. Or there's a 40% chance they're in a Numberphile video somewhere. 1. Sam Hartburn https://www.youtube.com/@samhartburn 2. Matt Parker https://www.youtube.com/@standupmaths 3. Matthew Scroggs https://www.youtube.com/@scroggs2 4. Brady Haran https://www.youtube.com/@numberphile 5. Geoff Marshall https://www.youtube.com/@geofftech2 6. Henry Reich https://www.youtube.com/@MinutePhysics 7. Mithuna Yoganathan https://www.youtube.com/@LookingGlassUniverse 8. Kat Phillips https://www.youtube.com/@KatDoesMaths 9. Steve Mould https://www.youtube.com/@SteveMould 10. Sophie Maclean https://www.youtube.com/@sophiemaclean9999 11. Peter Rowlett https://www.youtube.com/@peterrowlett 12. Katie Steckles https://www.youtube.com/@KatieSteckles 13. Grant Sanderson https://www.youtube.com/@3blue1brown 14. Tom Murphy VII https://www.youtube.com/@tom7 15. Destin Sandlin https://www.youtube.com/@smartereveryday 16. Ben Sparks https://www.youtube.com/@SparksMaths 17. Ayliean MacDonald https://www.youtube.com/@Ayliean 18. Rohin Francis https://www.youtube.com/@MedlifeCrisis Huge thanks to my Patreon supporters. They're the real meaning of christmas. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything other than protocol improvement. --- Ok, here is what he think is the current best protocol. We'll give it a try next year! --- For people P1 to Pn. Goals of the system: - no central authority needed - can be done remotely with no hidden information - does not give anyone their own name - no one malicious actor can do anything to exploit the system without risk of breaking everything Be as random as possible. No new random number can match any already on the list. STAGE 0: POPULATE THE LIST Everyone adds a pair of random numbers, shuffles the list, and passes it on. STAGE 1: DO THE SHUNT P1 shuffles the list and then shunts the pairs along one space to form new pairs (last number wraps to first number). Everyone from P2 to Pn-1 uses a 50% probability of also shunting an extra space in the same direction. Pn definitely does not shunt. No one shuffles. Everyone replaces their random numbers. STAGE 2: THE CHECK Everyone looks to see where their numbers are and remembers their exact location. If they move at any point from now on, a player should raise the alarm that the system has been compromised. No one shuffles. Everyone replaces their random numbers. STAGE 3: THE BIG REVEAL Everyone replaces their 'left numbers' (aka 'receiver IDs') with their name of any other agreed system for identifying people. The other number is replaced with a new random number, no one shuffles. STAGE 4: THE READ OUT Goes around the loop again with everyone looking to see whose name their random number is paired with. This is who they buy a gift for. They then cover their tracks by swapping out the random number for a new one. --- And for completeness, here is the protocol exactly as we tried it in this video. --- STAGE 0: POPULATE THE LIST Everyone adds a pair of random numbers, shuffles the list, and passes it on. STAGE 1: DO THE SHUNT P1 shuffles the list and then shunts the pairs along one space to form new pairs (last number wraps to first number). STAGE 2: SWAP THE LIST Everyone replaces their first random number with their name and their second random number with a new random number. STAGE 3: THE BIG REVEAL Goes around the loop again with everyone looking to see whose name their random number is paired with. This is who they buy a gift for. They then cover their tracks by swapping out the random number for a new one. Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Messing around by Everyone Else MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Support me on Patreon before the end of November 2024 and get your own prime number test: https://www.patreon.com/standupmaths Come and see Steve Mould, me and other humans on Monday 2 December in London. I'll be doing a free meet and great with Bec Hill after the show. https://festivalofthespokennerd.com/tickets/ Here is the current main list of divisibility tests from 7 to 30,000: https://www.dropbox.com/scl/fi/zednyqcvd4kfi0zgm8n6t/divisibility_tests_to_30000.txt?rlkey=k7x87cnex6r32cuior6w9kzo5&dl=0 Divisibility Rules by Michael "Vsauce" Stevens on D!NG. https://www.youtube.com/watch?v=f6tHqOmIj1E Why 7 is Weird by James Grime on Numberphile. https://www.youtube.com/watch?v=UDQjn_-pDSs Buy signed props from the channel! All money goes to charity. https://www.ebay.co.uk/usr/standupmaths Huge thanks to my Patreon supporters. They come together to support me dividing. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced and random numbers by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Dice on loan from the Bec Hill Collection MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Here is the full MIT Election Data and Science Lab report: https://electionlab.mit.edu/sites/default/files/2021-04/Blue-Shift-in-2020-Election.pdf University of Florida's Election Lab early voting stats. https://election.lab.ufl.edu/early-vote/2024-early-voting/ Trump quotes from the 2020 election night are 01:09 to 01:20 and 07:31 to 08:22 from this video: https://www.youtube.com/watch?v=YlmaKdbC6ZM&ab_channel=ABCNews CNN have a great timeline of what will happen when: https://edition.cnn.com/2024/11/02/politics/how-election-night-will-unfold-hour-by-hour/index.html I found this to be a very helpful article: "Blue Shift And Red Mirage Explained: Why The First Vote Tallies May Be Misleading" https://www.forbes.com/sites/saradorn/2024/10/29/blue-shift-and-red-mirage-explained-why-the-first-vote-tallies-may-be-misleading/ Democracy sausage. You heard me. https://en.wikipedia.org/wiki/Democracy_sausage If you have any suggestions for follow-on Election 2024 math videos, drop me a line: [email protected] Huge thanks to my Patreon supporters. They are the dark money super pac behind my channel. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Adequate filming by Matt Parker Expert editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Take your personal data back with Incogni! Use code standupmaths at the link below and get 60% off an annual plan: https://incogni.com/standupmaths ^.?$|^(..+?)\1+$ Fantastic blog post by Illya Gerasymchuk. "Demystifying The Regular Expression That Checks If A Number Is Prime" https://illya.sh/the-codeumentary-blog/regular-expression-check-if-number-is-prime/ Thanks to viewers Chris Lawrence and Jimmy Diep for suggesting the topic. Huge thanks to my Patreon supporters. They keep me supplied with all the primes I need. https://www.patreon.com/standupmaths CORRECTIONS - Several people have corrected me that regex is zero indexed it’s just that \0 refers to the entire matched string. - There is some concern about my pronunciation of rejex. - Let me know if you spot anything else! Filming, VFX and editing by Alex Genn-Bash Written and performed by Matt Parker Extra material by Sam Hartburn Number yeeting by Lucie Green Spooky lighting and producing by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Order Love Triangle now and get a personalised gift tag! https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=wng5c4y Or just get a copy with no gift tag. You'll receive it a bit faster. https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=yx6gcky There is a small chance we still have limited-edition covers left. You can check here: https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=w7qzcxw Thanks to everyone who bought the USA edition! You can still get copies here: https://www.penguinrandomhouse.com/books/672455/love-triangle-by-matt-parker/ I will send out the book marks soon! I didn't quite get them all done before the video was released. Huge thanks to David Rankin (R&D Operations Engineer, Catalina Sky Survey, University of Arizona) for discovering Mattparker as well as taking the time to talk to me about it. David's channel: https://www.youtube.com/@rankinstudio Details and data about Mattparker https://minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=314159 https://ssd.jpl.nasa.gov/tools/sbdb_lookup.html#/?sstr=314159 Search for "314159" on https://alcdef.org/ Here is the Numberphile video: https://www.youtube.com/watch?v=n9lKcs-h7fg&ab_channel=Numberphile Huge thanks to Ilgmars Eglitis (Head of Baldone Observatory, Latvia) for running the extra analysis of Mattparker's light curve and found the approximate rotation period and shape. "Light curve analysis of main belt asteroids 4747, 5255, 11411, 15433, 17866" https://www.degruyter.com/document/doi/10.1515/astro-2022-0227/html?lang=en This paper contains a derivation of the absolute brightness to size equation. https://mathscinotes.com/wp-content/uploads/2016/08/Jackpot.pdf Asteroid belt diagram based on a NASA image from here: https://www.nasa.gov/image-article/picturing-our-solar-systems-asteroid-belt/ Cheers to my Patreon supporters for supplying so many great depictions of Mattparker. Support me on Patreon and you can join in with the next ridiculous thing I ask for help with. Also a christmas card. https://www.patreon.com/standupmaths CORRECTIONS - Yes, I said days instead of hours. But we fixed that with the text. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

2^136,279,841 - 1 has 41,024,320 digits and is prime! Read all about the new largest prime number ever found: https://www.mersenne.org/primes/?press=M136279841 Huge thanks to Luke Durant, George Woltman and everyone at the Great Internet Mersenne Prime Search. Get involve in the search for large primes! https://www.mersenne.org/ This is the breakdown of the maths methods used by the Great Internet Mersenne Prime Search: https://www.mersenne.org/various/math.php Here are the details of the test completed on M52 (the 52nd Mersenne prime). https://www.mersenne.org/report_exponent/?exp_lo=136279841&full=1 The old computer photo was of Alice Betsy and Donald Gillies in front of the ILLIAC I computer which found three record-breaking primes in 1963. https://en.wikipedia.org/wiki/Donald_B._Gillies In 2016 I printed the then-biggest prime: https://www.youtube.com/watch?v=tlpYjrbujG0 And I talked about the Lucas-Lehmer test to prove it is prime: https://www.youtube.com/watch?v=tlpYjrbujG0 This is my Pi By Hand video which Daniel B also features in. https://www.youtube.com/watch?v=LIg-6glbLkU Yes, pieces of Skylab (spacecraft, not dog) are in Esperance, Western Australia. https://www.esperance.wa.gov.au/esperance-museum/skylab Keep an eye on A Problem Squared to see why I was recording somewhere between Perth and Esperance. https://podcasters.spotify.com/pod/show/a-problem-squared Huge thanks to my Patreon supporters. I bought Lucie and Steve pizza at Lucky Bay Brewing. Support me and I'll buy more beer for my family. Think of my family! https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Lucie Green Timing and moral support by Steve Parker Editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ What's that? You want the first 1,000 and the last 1,000 digits? Ok then. 88169432750383326555393910037811735897120735450906604106715637641242263069475684144172599034772328310883750973995977687416411861067989576855334864723995205060798449228721358061244076525539478775000439534750170154974576283410295848102383525535219220018019849855213682289354421233731941048436851937365086094936028711317471018571432064708199837306148628782571243013388625206173910274307646954181724489815008305937259728175843471969304505016010624205115241396117063758595818539722355781328791512832801883905761320993838905658296650552409138343183552227657748911779669750031093294093386744231619348351202551513084271500976680524602998030484860484032028378812274042189370786146986225083833180256124082952929091707884436572049502580821237700560065034341723563299580864533178881894890817148581725172201276201796923763182586106207328500056407876479535665919678190450758160463293878836864796419780569458825516434971724519669668448902003364676649856436358572985441582849317833496323027747555507286203346254829408 ... 379917800074819834879174805544034190986430521374206285055121736821172730439885890696160696738793999689882023176568153106746504313606250642598076140813828315717419942537662944964306217371556136368352752973759780217936883138877627248808662700396663095279153973893902666086461616485583762677066904293427343455290492166513799179605246624655355275099116671949790439962847921294301305427953128314765939127728218346554896221997074614829104667188434513710908760262441958100654871778292588483687836525477866623456759406568413274257016253600215416101593545336364864016927856588259167176083248724260943143895526709760397223040669769164386169801147177769071911797791558053414248681988242398764524051454517822994048288203377834666172715887058758075640360627674534014864896061019562846339719171054887748917152381772467028804688715061941073872049488371255679127735992935698305082529421587975486852806517931459412567957568284228288124096109707961148305849349766085764170715060409404509622104665555076706219486871551

Learn more about Jane Street’s internship opportunities: https://jane-st.co/SUM-internships Check out Steve’s video: https://youtu.be/FMRi6pNAoag This is Ryan’s Diffusion Illusions site: https://diffusionillusions.com And here is the full “Diffusion Illusions: Hiding Images in Plain Sight” paper by Ryan Burgert, Xiang Li, Abe Leite, Kanchana Ranasinghe and Michael S. Ryoo. https://diffusionillusions.com/assets/diffusion_illusions.pdf Download of the jigsaw: https://www.dropbox.com/scl/fi/rennmoqgzjdup5uof7qna/jigsaw_jumbled.pdf?rlkey=u4v18cwbvut672hqx895tqga0&dl=0 Here’s the layout of the different edge types: https://www.dropbox.com/scl/fi/dvylpftby1uzlrmpdt1mp/matt-jigsaw-layout.pdf?rlkey=512hqdr9y9h5mxjonhxiwhsy4&dl=0 Huge thanks to my Patreon supporters. They provide all the valid solutions I need. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Gus Melton Written and performed by Matt Parker and Steve Mould Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Dice on loan from the Bec Hill collection MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Secure your privacy with Surfshark! Enter coupon code standupmaths for an extra 4 months free at https://surfshark.com/standupmaths Thanks to Dylan from Seattle for sending this amazing maths fact to me. You can see an archive of their ChatGPT conversation here: https://chatgpt.com/share/00ed003b-8be6-4756-92b3-de91454ab3f2 Thanks to Grant from 3blue1brown for putting actual work aside and talking probabilities with me on a long train journey. You see see a longer version of this animations here: https://youtube.com/3blue1brown This was my dice video from a few years back, "The unexpected logic behind rolling multiple dice and picking the highest." https://www.youtube.com/watch?v=X_DdGRjtwAo Satisfy your D36 and all your other dice needs over at Maths Gear: https://mathsgear.co.uk/products/d36-dice Also on the Dice Lab if you're USA based. https://www.mathartfun.com/d141518.html Huge thanks to my Patreon supporters. They keep me in dice. So many dice. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! - PS Never say die. Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Throwing Dice at Matt: also by Alex Genn-Bash Some dice on loan from the Bec Hill collection MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Go to https://ground.news/standup for a data-driven, objective way to stay fully informed on the issues most important to you. Save 40% on the Ground News unlimited access Vantage plan with my link. Thanks to Jop Schaap for analysing how lucky I was. See their report here: https://www.dropbox.com/scl/fi/yrzp0z3r2u4dgistmtor1/Lucky_predictions_Jop_Schaap.pdf?rlkey=c0ctkocele9sso7kh46y73kcp&dl=0 If you'd like to see my spreadsheet, here it is. The percentages and values were all generated by some terrible python code I hand-wrote myself. https://www.dropbox.com/scl/fi/e6wfyb9382gr6ihnvyp7z/Lucky_predictions_Matt-spreadsheet.xlsx?rlkey=95lj0l1c59meo1yrxq0hxjgol&dl=0 Thanks to Evan Harris for chatting about election stats with me and kindly recording a video. Here's the big table of data they made: https://www.dropbox.com/scl/fi/3ahu3g5gouaseb7ch7f0s/Mid-Sussex-Local-Election-Results.docx?rlkey=g22ko1y5h8sb414vrfgfpvf6t&dl=0 Ongoing thanks to Count Binface, Tom Wilson and Dave Rowntree who have helped hugely with this video series. Part 01: https://youtu.be/zDLxgEquxA0 Part 02: https://youtu.be/K-hdJIWsK3A Massive thanks to my Patreon supporters. I'm definitely lucky to have you all. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Matt Parker Editing by Gus Melton Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Opening titles by Alex Genn-Bash Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

If you'd like a piece of the film: support me on Patreon. https://www.patreon.com/standupmaths Then sign up to get the physical film here: https://forms.gle/eNc46SgJW9bn3RaF6 If you'd like to watch every last frame we shot, the complete scan of every roll of film is on my second channel. https://youtu.be/99ru8jtD7-4 Comment below if you think there is a preexisting video which would beat me as the first 35mm filmed-as-a-YouTube-video video. Huge thanks to Keslow Camera for letting us use their fantastic film cameras. They hire all sorts of great stuff: https://www.keslowcamera.com/ Much appreciation to Truman Hanks who suggested the video idea, organised the film, shot the video and did the edit. Check out his film-loading and cinematography work: https://www.trumanhanks.com/ Thanks to Bec Hill for helping out with the filming on the day. All the props were lovingly hand-made by Bec using stationery we found around Sam Kieffer's place. My podcast with Bec: https://podcasters.spotify.com/pod/show/a-problem-squared Bec's podcast with Sam, which they should have been working on instead of helping me make giant models of film: https://podcasters.spotify.com/pod/show/enemy-in-paris Thanks again to Dan Ming for setting us up with Keslow. Read about their work here in ICG Magazine. https://issuu.com/icgmagazine/docs/may2023/16 Development was by FotoKem and the digital scan of the film was done by the lovely The Negative Space. https://thenegative.space/ Huge thanks to my Patreon supporters. They keep my reels turning. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Truman Hanks Sound mix by Peter Doggart Written and performed by Matt Parker Props by Bec Hill Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Details on where you can buy Love Triangle in the USA: https://bit.ly/3wCTesR Or if you just want it from Amazon, this is my affiliate link: https://amzn.to/4fy30Ph For people in Europe, signed UK copies are still available on Maths Gear: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed The box set you should not buy: https://achievefulfilment.onwarehouse.app/preorders/new?campaign_id=ymgvcjy Paul Catherall shop: https://www.paulcatherall.com/shop/ And now for some actual links that pertain to the video itself. The Bingo Paradox by Arthur Benjamin, Joseph Kisenwether & Ben Weiss https://www.tandfonline.com/doi/abs/10.4169/mathhorizons.25.1.18 Also here: http://digitaleditions.walsworthprintgroup.com/publication/?i=432359&article_id=2856994&view=articleBrowser 10,000 Stand-up Maths bingo cards: https://www.dropbox.com/scl/fo/t8l5pl23axozpjidbdun7/AFzNqCra3HfowHTtSuluHO0?rlkey=b4m5vp13b4fdug6521ijb8unw&dl=0 10,000 Love Triangle bingo cards: https://www.dropbox.com/scl/fo/zy93kfqqy2rb4n4wstgu4/AM0E6heZnvFW6cNFek7xG7U?rlkey=nkc9d71dw4bp4r01dp8dhos6p&dl=0 I heard a rumour you should listen to the podcast A Problem Squared. https://open.spotify.com/show/7Hp5QDk9PsWyEXtcsDz34a?si=9d0a481401de443a Huge thanks to my Patreon supporters. They took very little convincing to make fun of me via the medium of bingo card suggestions. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Additional performance by Skylab the Dog Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Dice on loan from the Bec Hill collection MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Love Triangle sweepstakes are open until Monday August 19th: https://sites.prh.com/love-triangle-sweepstakes Details on where you can pre-order/buy Love Triangle: https://bit.ly/3wCTesR Or if you just want it from Amazon, this is my affiliate link: https://amzn.to/4fy30Ph For people in Europe, signed UK copies are still available on Maths Gear: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed “Search For Largest Polyhedra” by Donald Grace https://www.ams.org/journals/mcom/1963-17-082/S0025-5718-63-99183-X/S0025-5718-63-99183-X.pdf Thanks to Bill Hedges at Cosmic Films Studio in Nebraska, USA for having us to film our sci-fi adventure. Check out Bill’s Cosmic Cat series: https://www.youtube.com/@williamhedges1519 Thanks to Laura Taalman for 3D printing the fantastic shapes for me. She's a Professor of Mathematics at James Madison University. https://mathgrrl.com/ Thanks to Roger Antonsen, for testing the local maxima of the Grace shape for this video. Roger sadly passed away earlier this year. His department at the University of Oslo have published a memorial page to celebrate him: https://www.mn.uio.no/ifi/personer/minneside.html Geogebra model of the Grace's Shape made by Sam Hartburn. Much appreciation to Donald's children who talked to me about late nights spent with their father watching a computer crunch away at some math. Huge thanks to my Patreon supporters. I could maximise the occupancy of a unit sphere with my gratitude. https://www.patreon.com/standupmaths CORRECTIONS - 00:23 I say "August 22" which is wrong: this Tuesday is August 20. Please don't tell my publishers I got that wrong. - At 16:50 I say "eight times" which is completely wrong and not part of the formula. No idea what was going on there. The onscreen value (and everything else I say) is correct. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Additional footage by Bill Hedges Written and performed by Matt Parker Voiceover by Gemma Arrowsmith Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson On-set entertainment by Cosmic Cat (and kittens) MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Find out more about Jane Street's internships in Hong Kong and opportunities around the world! https://jane-st.co/hkginternship-sum Visit the Klein-ing Frame and the rest of the park yourself: http://www.infopia.net/create/index.html This is the site and map I originally found. Site: https://polyhedra.cocolog-nifty.com/blog/2019/04/post-87185f.html Map: http://www.infopia.net/create/images/route1.pdf Check out the original Tweet: https://x.com/MathematicsUCL/status/1358532581113946114 Huge thanks to David Brooks for being our guide. More on their physics work at JAXA and elsewhere here: https://davidbrooks.info/about/ If you'd like to know more about ISAS/JAXA, their site is here: https://www.isas.jaxa.jp/en/ Anyone interested in Hinode can look at the MSSL website here: https://solarb.mssl.ucl.ac.uk/SolarB/ Huge thanks to my Patreon supporters. Without them I would be orientation-reversed. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Gus Melton Written, performed and additional filming by Matt Parker Local translation services by Dave Brooks Attending a conference in Japan to justify the trip by Lucie Green Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Pre-order Love Triangle anywhere, register for the sweepstakes here: https://sites.prh.com/love-triangle-sweepstakes Details on where you can pre-order/buy Love Triangle: https://bit.ly/3wCTesR Or if you just want it from Amazon, this is my affiliate link: https://amzn.to/4fy30Ph For people in Europe, signed UK copies are still available on Maths Gear: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed Huge thanks to Steve Mould for joining me in this video! Check out Steve's channel, I assume he can use some extra subscribers: https://www.youtube.com/stevemould Thanks to the Royal Observatory, Greenwich for letting us come in to see all the lines and their respective telescopes. You should visit! It's in London. https://www.rmg.co.uk/royal-observatory Much appreciation to my Patreon supporters. They keep me on the correct line. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Steve Mould performed by Steve Mould Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Count Binface is on tour around the UK in September and October 2024. Details and tickets here: https://www.aegpresents.co.uk/event/count-binface/ Tickets for An Evening of Unnecessary Detail NYC (and other London shows) here: https://festivalofthespokennerd.com/tickets/ This is the website I scraped the election data from: https://whocanivotefor.co.uk/elections/parl.2024-07-04/uk-parliamentary-general-election/ But as of around 12 July 2024 it will be officially available here: https://commonslibrary.parliament.uk/research-briefings/cbp-10009/ This is the polling data website I talk about: https://www.thisvotecounts.co.uk/ Thanks to all the candidates who took time to help make these videos: Tom Wilson, Dave Rowntree and Count Binface. Plus all the many people who during a long night working at the counting centre, still kindly chatted with me and answered my questions. Huge thanks to my Patreon supporters. Without them I wouldn't be first past the post. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Matt Parker Additional footage by the Count Binface Party Editing by Gus Melton Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Vote Count Binface for Bindependence Day! https://youtu.be/YwnacH0VNhQ?si=1wamTebLkBfT_NfU Make your vote count. https://www.thisvotecounts.co.uk Thanks to Dave Rowntree for taking time out on the campaign trail to help with this video: Dave Rowntree for Mid Sussex https://www.daverowntreeformidsussex.com Thanks to Count Binface to for taking time out from commanding great swaths of our galaxy to peer-pressure me into this video: Count Binface for Richmond and Northallerton https://www.countbinface.com Catch Count Binface on his debut comedy tour across the UK this September/October! http://aegp.uk/Binface This is the BBC article I showed: “Tactical voting: What to watch out for on leaflets telling you who can win your seat” https://www.bbc.co.uk/news/articles/c722gl8rzdro The excellent More or Less covered bad leaflet charts as well. https://www.bbc.co.uk/sounds/play/m00202g3 Watch the rest of Sky News grilling Reform over their 1066 plot. https://news.sky.com/video/why-did-you-pick-1066-skys-sophy-ridge-questions-richard-tice-on-his-campaign-message-13142125 Excellent video on voting systems by Primer. https://youtu.be/yhO6jfHPFQU?si=95YjMpxvhJk8ogsa Here’s my book Love Triangle I keep pointing at: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed FULL DISCLOSURE: as well as being an official Counting Agent for the Count Binface Party I did also donate my own money to help pay for getting all the flyers printed. The print shop demanded Earth Monday and refused to accept Galactic Blemflarcks. Huge thanks to my Patreon supporters. Even though I don’t think I can legally spend their money on this video. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Matt Parker Editing by Alex Genn-Bash Written and performed by Matt Parker Space lasers by Count Binface Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get a signed first edition of Love Triangle from Maths Gear: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed All UK options: https://www.penguin.co.uk/books/443151/love-triangle-by-parker-matt/9780241505694 All USA options: https://bit.ly/3wCTesR Huge thanks to Rollie and Jenn. Check out their videos on the diamond system. https://youtu.be/PW_pSnZ1BAk https://youtu.be/KBCwU8Uno9A Rollie's Climate Town videos: https://www.youtube.com/@ClimateTown Rollie is an average pool player: https://youtube.com/playlist?list=PLqVm2hbVs27MbFKr7IqZMuqgXjvMJ7pa0&si=4gGhuM3KGrr0Y-VH Jenn's pool videos: https://www.tiktok.com/@jenn9mmbarretta We filmed at Jenn's fantastic venue: Skyline Billiards and Bar. You should go there! https://www.skylinebilliards.com/ And that Grant guy makes some pretty good math videos: https://www.youtube.com/@3blue1brown Huge thanks to my Patreon supporters. Whenever I bounce off them they give me plenty of spin. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Gus Melton Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Playing darts in the background out of focus: Bec Hill MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Pre-order a signed 1st edition of Love Triangle now: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed All UK options: https://www.penguin.co.uk/books/443151/love-triangle-by-parker-matt/9780241505694 All USA options: https://bit.ly/3wCTesR Hugh thanks to the British Museum for getting the papyrus out of storage for me to see. You can watch the other non-papyrus video I made with them over here: https://youtu.be/WctTJVdsISE If you want to have a closer look at the maths on the papyrus, there are scans on the British Museum site: https://www.britishmuseum.org/collection/object/Y_EA10058 CAN YOU SOLVE IT: You have to divide 100 loaves between 5 men in such a way that the shares received shall be in arithmetical progression. And that 1/7 of the sum of the largest 3 shares shall be equal to the sum of the smallest 2. What is the difference of the shares? Huge thanks to my Patreon supporters. They keep my bread fairly divided. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Gus Melton Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get your Sydler-shape limited-edition dust jacket now! https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed Here is the bonus video with all the details: https://youtu.be/cB18rgH5YaM See some of you at the Copenhagen Developers Festival, 28 August 2024 https://cphdevfest.com/ Thanks so much to Paul Catherall who made these beautiful prints. https://www.paulcatherall.com If you order Love Triangle on Waterstones you will not get the dust jacket but you can use the use the discount code 1+2+3+4+5+6=21 to get 21 percent off the already discounted price. https://www.waterstones.com/book/love-triangle/matt-parker/9780241505694 Matthias Goerner's page about Sydler's shape: https://www.unhyperbolic.org/sydler.html Or see the 3D model directly here: https://sketchfab.com/3d-models/sydler-pi4-polyhedron-final-70cf6dda7f6545dcb827bcec87fb526b Henry Segerman's video: https://www.youtube.com/watch?v=tH6vLXMaCwQ&ab_channel=HenrySegerman Robin's 15° shape: https://sketchfab.com/3d-models/single-angle-15-coloured-8230e145f97c4daba4cfbaf317f0a55b CONJECTURE DISCLAIMER: We believe that the "there must exist a single-angle polyhedron for any angle θ with an algebraic sine" conjecture is true but don't have a nice proof. There seem to be all the required parts for the proof in papers by Sydler and Jessen, but it's not fully assembled. Huge thanks to my Patreon supporters. They keep me orthogonal. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Find out more about Jane Street’s programmes running across the world: https://bit.ly/sum-janestreet-programs Including the WiSE course which is open to self-identifying women and gender-expansive university students and incoming students: https://www.janestreet.com/join-jane-street/programs-and-events/wise/ Check out KangarooPhysics’ original gif showing the cross-section through the packing arrangment: https://x.com/kangaroophysics/status/1491858072251342850?s=46&t=EVDbN01K_p7T27Gd23R0bw And Daniel Piker’s amazing 3D model: https://sketchfab.com/3d-models/rod-packing-7directions-2-e56a6e899b2b4ef4bb458c66343363e4 More detail on rod packing in this paper: https://journals.iucr.org/paper?S010876730001151X If you want to watch the extended cut, with every excruciating, pencil-pushing moment included, head over to this video on the second channel: https://www.youtube.com/watch?v=EsBqeGtThW8 You can also watch the original "How to build a Hexastix in 72 easy steps" if you just want to build a Hexastix. In 72 easy steps. https://www.youtube.com/watch?v=DelH1S32dOg If you need 85 custom pencils in your life (The 67 you need, plus we've put in a few spares) you can buy a set while stocks last over on Maths Gear. Sorry the set is quite expensive. This is just the cost price I originally paid to get them made. Elastic bands are not included. https://mathsgear.co.uk/products/prism-pencils-pack-of-85 Huge thanks to my Patreon supporters. They are as special as a triangular pencil. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Love Triangle: https://mathsgear.co.uk/products/love-triangle-by-matt- parker-signed

Sign the petition now! https://mathsballs.com/ Pre-order Love Triangle to read about the Impossi-ball. https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed Check out Jon-Paul's balls: https://www.tiktok.com/@jonpaulsballs Huge thanks to Jon-Paul and Allison for making the ball and inviting us to their studio. https://12p.com/ Thanks to everyone at Liverpool FC for being so accommodating and friendly. Tim's home sustainability tech channel: https://www.youtube.com/@TimAndKatsGreenWalk And his foot donut game: https://stone-baked-games.itch.io/foot-donut-demo Humble Pi stand-up special is on Maths Gear as a download, and all the other places. https://mathsgear.co.uk/products/humble-pi-show https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/B0CH4WW1L2/ This was my original video from 2017: https://www.youtube.com/watch?v=btPqKAGyajM The UK government parliamentary petition and official government response: https://petition.parliament.uk/archived/petitions/202305https://petition.parliament.uk/archived/petitions/202305 Huge thanks to my Patreon supporters. This would be impossiball without you. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Maths of the Day music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed

Pre-order Love Triangle on Maths Gear now and get a signed copy! https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed Also, a special book cover if you're fast enough. You'll be fast enough. Video was inspired by this r/mathematics post and the discussion it lead to: https://www.reddit.com/r/mathematics/s/UNJaYMGGtS Huge thanks to my Patreon supporters. I’m a huge exponent of all of them, minus none. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Gus Melton Graphics by Sam Hartburn and Matt Parker Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book! https://mathsgear.co.uk/products/love-triangle-by-matt- parker-signed

Here is camman18's YouTube short about the mystery: https://youtube.com/shorts/WvyVFSOD-uM?si=yeOzmMj6BD0a0E3c Huge thanks to Natalie for sending it to me! This is the bug report Oliver found: https://bugs.mojang.com/browse/MC-119369?focusedId=804740 Explore floating point errors yourself using the IEEE-754 Floating Point Converter: https://www.h-schmidt.net/FloatConverter/IEEE754.html My previous video about Minecraft: https://www.youtube.com/watch?v=8Ko3TdPy0TU Thanks to my patreon supporters. They keep my this.status = IN_AIR. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Matt Parker Editing by Gus Melton Minecraft footage by Oliver Dunk Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book! https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed

Please note down the new value of pi: 3.14159265358979323846264338327950288419716939937510582097494459230781640628620899862803482534211706798214808651328230664709384460955058223176 If you'd like to sign up to hear about future ridiculous maths projects that require volunteers: https://forms.gle/w44THpNJ3jWUPqHy6 Play list of all my previous calculating pi day videos: https://youtube.com/playlist?list=PLhtC92GarkjyYbxI3-4qzIWIRbZaw4wuP&si=DzWXgnv_vYfDgiLZ This calculation was paid-for with surplus funding from a previous Stand-up Maths kick-starter. If you'd like to support future projects, you can join me on Patreon. My Patreon supporters keep me irrational. https://www.patreon.com/standupmaths Huge thanks to the Pi-by-hand Committee who spent two years working on this project: Alex Genn-Bash Ayliean McDonald - https://www.youtube.com/@Ayliean Ben Sparks - https://www.youtube.com/@SparksMaths Christian Perfect Deanna Judd James Grime - https://www.youtube.com/@singingbanana Katie Steckles - https://www.youtube.com/@KatieSteckles Matthew Scroggs - https://www.youtube.com/@chalkdustmag Max Hughes Nicole Jacobus Sophie Maclean - https://bit.ly/Sophie_Numberphile Thanks to Steve Mould for making sure everything was legit, and only mentioning tau six or so times. William Shanks was voiced by the excellent Ben Moor: https://www.spesh.com/ben/ The amazing voice over was provided by the fantastic Gemma Arrowsmith: https://www.gemmaarrowsmith.com/ CORRECTIONS - None yet, let me know if you spot anything (other than the final 6). - Yes, this video was released the day before Pi Day. It's so teachers have a chance to watch it and prepare their Pi Day lessons for the big day. Filming and editing by Alex Genn-Bash Animations by William Marler Written and 'performed' by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ NEW BOOK: https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed

Check out Jane Street's excellent Academy of Math and Programming (AMP). https://bit.ly/3T6gc3n Jane Street has put together a fun logic puzzle to get folks excited about the AMP program. You don’t need to complete the puzzle to apply – it’s just something fun to get you thinking! Check it out: https://bit.ly/sum-amp Here are Andrew Taylors slides on "Rotation with three shears". I saw him give this talk at the MathsJam Gathering 2023. The proof is on page 4. https://github.andrewt.net/shears/ This is a nice introduction to the concept: https://cohost.org/tomforsyth/post/891823-rotation-with-three Way more details on the maths behind rotating with shears here: https://www.ocf.berkeley.edu/~fricke/projects/israel/paeth/rotation_by_shearing.html Oh dang my book: https://mathsgear.co.uk/collections/books/products/love-triangle-by-matt-parker-signed Huge thanks to my Patreon supporters. They spin me right round, baby, right round, like a record, baby, right round^3. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Dan Daniel Written and performed by Matt Parker Graphics by Matt Parker and Andrew Taylor Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/

Do check out my video with Adam Savage over on Tested: https://youtu.be/s_F4uD8wAs0 Yes, I'm back in NYC for An Evening of Unnecessary Detail on Sunday April 14. https://www.eventbrite.com/e/matt-parker-an-evening-of-unnecessary-detail-tickets-847453715877?aff=oddtdtcreator Pre-order my new book! https://mathsgear.co.uk/collections/books/products/love-triangle-by-matt-parker-signed The excellent graphics of spinning dodecahedrons were made by Ben Sparks. You can see the GeoGebra file here: https://www.geogebra.org/m/yhkepkbc Some more details about space diagonals on Math Stack Exchange. https://math.stackexchange.com/questions/4181398/space-diagonals-of-a-dodecahedron Huge thanks to my Patreon supporters. They keep my polyhedra intersecting. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Laser cutting by Lisa Mather Extra graphics by Ben Sparks Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Training on using a bandsaw by Adam Savage MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Pre-order Love Triangle on Maths Gear now and get a signed copy! Also, a special book cover if you're fast enough. https://mathsgear.co.uk/products/love-triangle-by-matt-parker-signed UK edition out 20 June, pre-order options: https://bit.ly/UKLoveTriangle USA edition out 20 August, pre-order options: https://bit.ly/3wCTesR Here are the fantastic GeoGebra files Ben Sparks made for the video. Modulated 1 bit: https://www.geogebra.org/m/bndn54th Modulated 2 bit: https://www.geogebra.org/m/enkymjtg Constellations: https://www.geogebra.org/m/fff3aqvn Sum of waves: https://www.geogebra.org/m/trjxxf9p Huge thanks to my Patreon supports. They enable me to be outstanding in a field. https://www.patreon.com/standupmaths CORRECTIONS - 07:15, don't ask why that circle is there. It's not a clue. I just forgot to turn off a layer in photoshop. - At 10:06 I didn't show the Gray Code paths which loop around the diagram. But you get the idea. - Yes, I spelled "Pello!" in the hidden binary message instead of "Hello!". It was an idea I had at the last second and I didn't double check where I was clicking! - Let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Geogebra files by Ben Sparks Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

See you all in Wemding, Germany in 2033 for the next installation of this inevitable maths mistake. Thanks to everyone involved with Zeitpyramide who were hugely welcoming and accomodating. Official Zeitpyramyde website: http://www.zeitpyramide.de/ Check out Ayliean MacDonald's excellent work on TikTok and indeed YouTube: https://www.tiktok.com/@ayliean/video/7276938427071876385 https://www.youtube.com/@Ayliean We also had an very helpful German-to-English translator in Benjamin Bungeru who kindly did not translate all of the speeches for me. Read more about off-by-one errors in my book Humble Pi: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Huge thanks to my Patreon supporters. They lift me up like a 6.5 tonne block. https://www.patreon.com/standupmaths CORRECTIONS - 01:24 I say "square numbers" when I mean "even square numbers". First corrected by TheSamuelWells - A few people have noted that the "clarinet" is actually a "soprano saxophone". I am very sorry to all the music nerds. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker and Ayliean MacDonald Blocky animations by William Marler Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson All soprano saxophone music was recorded live on location. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Support "Doing Things the Hard Way Matt" on patreon: https://www.patreon.com/standupmaths Full video of Doing Things the Hard Way Matt doing things the hard way is on Patreon: https://www.patreon.com/posts/watch-full-doing-98412935 OEIS sequence A010527 "Decimal expansion of sqrt(3)/2" https://oeis.org/A010527 Do support the OEIS! https://oeisf.org/donate/ And here are a bunch of the digits: 0.8660254037844386467637231707529361834714026269051903140279034897 Wikipedia page on "ISO metric screw thread" https://en.wikipedia.org/wiki/ISO_metric_screw_thread Huge thanks to my Patreon supporters. They keep my triangle equlateral. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Oh look at this: https://forms.gle/hWes6BgPji3L8RfH6

Check out AMP or suggest it to someone who could benefit. And here is the puzzle: https://bit.ly/sum-amp Thanks to Jane Street for sponsoring this video! https://www.janestreet.com/join-jane-street/ I'll be doing An Evening of Unnecessary Detail at the Bristol Beacon, UK on Tuesday 12 March 2024. Come and celebrate Almost Pi Day with me! And celebrate Ages Until Tau Day with Steve Mould. https://festivalofthespokennerd.com/tickets/ https://bristolbeacon.org/whats-on/an-evening-of-unnecessary-detail/ Here is Grant's old, old 3blue1brown video. It's so good. https://www.youtube.com/watch?v=-9OUyo8NFZg Check out Ben's GeoGebra file we used to simulate the PolyPlane: https://www.geogebra.org/m/h9gpaawf Polyplane will be at the UCLA campus in Los Angeles, February 01 to 28, 2024. You can also still send in a polyhedron from anywhere in the world or enquire about hosting it yourself. https://polyplane.org/ Polyplane is made possible thanks to fiscal sponsorship from the Seattle Universal Math Museum. https://seattlemathmuseum.org/ Thanks to Henry Segerman for helping out as well. You should watch their awesome videos: https://www.youtube.com/@henryseg Huge thanks to my PatreonPlane supporters. They covered the "press pass" I had to buy to access the Joint Math Meeting. I could as part of the Press, right? https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Matt Parker Editing by Alex Genn-Bash Written and performed by Matt Parker GeoGebra graphics and addition material by Ben Sparks Edge complaining by Grant Sanderson Yes they bent the rules by Henry Segerman Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Oh look at this: https://forms.gle/hWes6BgPji3L8RfH6

Watch this space for any updates on if the rainforest moths we found were new to science! Thanks to Rainforest Expeditions who organised our trip. https://www.rainforestexpeditions.com/ Full disclosure: we paid for our flights to Peru but Rainforest Expeditions provided our visit into the rainforest for free. We visited the Tambopata Research Center and the Refugio Amazonas lodges. If you'd like to visit via the method of exchanging money, check out their site or socials: https://www.youtube.com/@RainforestExpeditions https://instagram.com/rainforestexpeditions/ Read more about the research being done in the rainforest by Wired Amazon. They also take volunteers if you like doing science while being rained on. https://www.wiredamazon.com/ Check out Mark's channel: https://www.youtube.com/@aFieldBiologist Mark is also a Lecturer in Wildlife, Ecology & Conservation Science at the University of Suffolk. See his research here: https://scholar.google.co.uk/citations?user=bX-GbkUAAAAJ Second channel video over here: https://youtu.be/EZpJ7h8k1fo Huge thanks to my Patreon supporters. They bought me a Peru tourist t-shirt and a pair of socks with sloths on them. But the time we got out of the rainforest I had no clean clothes and had to buy a new outfit at the airport to be presentable enough to get on the plane home. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced live in the rainforest by Nicole Jacobus Animations by William Marler Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Spoiler: In the next rainforest video I get stung by a bullet ant. But don't tell anyone, it's going to be a surprise. I know I was surprised. Downright shocked.

Yes, I'm doing a show in LA on Sunday January 7. It's a bit last-minute. Come and say hi! https://www.flapperscomedy.com/shows/an-evening-of-unnecessary-detail/72865/ Huge thanks to Sammie for sharing her equations. Check out her work at Northumbria University: https://www.northumbria.ac.uk/about-us/our-staff/b/sammie-buzzard/ "A Mathematical Model of Melt Lake Development on an Ice Shelf" https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2017MS001155 Sammie's very good python code! https://researchdata.reading.ac.uk/121/ Ice shelf satellite images thanks to NASA/Goddard Space Flight Center Scientific Visualization Studio. https://svs.gsfc.nasa.gov/2421/ Thanks to the Reading Biscuit Factory for letting us film in their lovely cafe. https://www.readingbiscuitfactory.co.uk/ I went to Antarctica with Hurtigruten. https://www.hurtigruten.com/en-us/expeditions/destinations/antarctica-cruises/ Huge thanks to my Patreon supporters. They bought me that coffee I was drinking. Sammie only wanted a glass of ice water. I swear I offered her other beverages but no, she's too on-brand for that. https://www.patreon.com/standupmaths CORRECTIONS - None yet, as far as I’m aware everything in the thumbnail is spelled correctly. Let me know if you spot anything! Filming by Alex Genn-Bash Editing by Christopher Brooks Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get your calculating christmas card! Support me on patreon: https://www.patreon.com/standupmaths All Patreon supporters will be emailed a personalised card (deadline end of December, but sign up sooner for an earlier email) and "statistically significant" or higher get posted a physical signed card (deadline end of December but sign up by end of November to get it before christmas). Check out Mark Dominus's great blog. Link to follow-on post at end of this one. https://blog.plover.com/math/irish-logarithm.html Here is the sign-up to volunteer for Pi By Hand 2024. https://forms.gle/CVocrwomCe1Q4iuX6 Paper on other method to get Ludgates's values: https://treasures.scss.tcd.ie/miscellany/TCD-SCSS-X.20121208.002/Ludgate-LogarithmixIndexes-20200610-1459.pdf All of the numbers I found are below. So many numbers. Presented three different ways, which is really unhelpful. Huge thanks to my Patreon supporters. They put the teeth on my cogs. https://www.patreon.com/standupmaths CORRECTIONS - Yes, the invention of logs in 1614 is 410 years ago, not 400. On the fly M y brain confused it with the 1624 publishing of Arithmetica Logarithmica, the first great log table book. First noted by AlexSh789. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Cogputer build by Lisa Mather and Katie Steckles Tree build by Nina, Carrie and assisted by Laura. Extra material by Adam Atkinson Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback 0-9 COGPUTER 0 cog: 1 teeth 1 cog: 42 teeth 2 cog: 41 teeth 3 cog: 27 teeth 4 cog: 40 teeth 5 cog: 8 teeth 6 cog: 26 teeth 7 cog: 18 teeth 8 cog: 39 teeth 9 cog: 12 teeth LABELS ON MIDDLE COG: CE, --, 00, --, --, --, --, --, --, 00, --, --, --, 00, --, --, 25, --, --, 00, 45, --, --, --, 81, --, 35, 00, 00, --, 63, --, --, --, 30, 15, 49, --, 54, 27, 00, 00, 00, 00, 42, 21, --, 40, 20, 10, 05, 72, 36, 18, 09, --, --, 56, 28, 14, 07, --, --, --, --, 48, 24, 12, 06, 03, --, --, --, --, --, --, --, --, 64, 32, 16, 08, 04, 02, 01 1-9 CHRISTMAS TREE Present 1 is 7 units tall Present 2 is 5 units tall Present 3 is 18 units tall Present 4 is 3 units tall Present 5 is 21 units tall Present 6 is 16 units tall Present 7 is 28 units tall Present 8 is 1 units tall Present 9 is 29 units tall Bauble 1 is 14 units high Bauble 2 is 12 units high Bauble 3 is 25 units high Bauble 4 is 10 units high Bauble 5 is 28 units high Bauble 6 is 23 units high Bauble 7 is 35 units high Bauble 8 is 8 units high Bauble 9 is 36 units high Bauble 10 is 26 units high Bauble 12 is 21 units high Bauble 14 is 33 units high Bauble 15 is 39 units high Bauble 16 is 6 units high Bauble 18 is 34 units high Bauble 20 is 24 units high Bauble 21 is 46 units high Bauble 24 is 19 units high Bauble 25 is 42 units high Bauble 27 is 47 units high Bauble 28 is 31 units high Bauble 30 is 37 units high Bauble 32 is 4 units high Bauble 35 is 49 units high Bauble 36 is 32 units high Bauble 40 is 22 units high Bauble 42 is 44 units high Bauble 45 is 50 units high Bauble 48 is 17 units high Bauble 49 is 56 units high Bauble 54 is 45 units high Bauble 56 is 29 units high Bauble 63 is 57 units high Bauble 64 is 2 units high Bauble 72 is 30 units high Bauble 81 is 58 units high 2-9 CHRISTMAS TREE CARD 2: 3 3: 12 4: 2 5: 17 6: 11 7: 24 8: 1 9: 20 height: bauble number 2: 64 3: 32 4: 16 5: 8 6: 4 12: 48 13: 24 14: 12 15: 6 18: 40 19: 20 20: 10 21: 72 22: 36 23: 18 24: 9 25: 56 26: 28 27: 14 28: 30 29: 15 31: 54 32: 27 34: 25 35: 42 36: 21 37: 45 40: 81 41: 35 44: 63 48: 49 THE END PS https://forms.gle/UqZQRwYe26SLJjMn8

You absolutely must check out the companion Climate Town video: https://youtu.be/fDx6no-7HZE Huge thanks to Rollie Williams, Nicole Conlan, Matt Nelson and the whole Climate Town team. We had an unreasonable amount of fun planning and filming these videos. You should subscribe to their channel: https://www.youtube.com/@ClimateTown What, you already are? Well unsubscribe and resubscribe you fool. Office Of The Inspector General, City of Chicago, Report Of Inspector General's Findings And Recommendations: An Analysis of the Lease of the City's Parking Meters. https://igchicago.org/wp-content/uploads/2011/03/Parking-Meter-Report.pdf Chicago Parking Meters, Llc: Financial Statements (With Independent Auditors' Report Thereon). https://www.chicago.gov/content/dam/city/depts/fin/supp_info/AssetLeaseAgreements/Audited%20Financial%20Statements/CPM_2021_Audited_Statements.pdf Want to do something about USA parking policy? Check out Climate Town's buddies at Climate Changemakers. They have put together a playbook on how to take action on minimum parking laws: https://www.climatechangemakers.org/playbook-parking-mandates Huge thanks to my Patreon supporters. They made this video possible by funding a lot of hotdogs. Take the deal here: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Stand-up Maths crew: Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced and light reflector by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Climate Town crew: Host, Head Writer, Editor: Rollie Williams Executive Producers: Rollie Williams & Ben Boult & Matt Nelsen & Nicole Conlan Writers: Nicole Conlan & Matt Nelsen Directors: Matt Nelsen & Ben Boult Cinematographers: Matt Nelsen & Ben Boult Assistant Editor: Laura Conte Fact Checker: Canute Haroldson Animator: Ian MK Cessna Yes, I ate every single one of those hotdogs.

Here is the value of "Vegas Pi": 3.14159265358979323846 1715364367892590360011 6892589235420199561121 968230301952035301852 Read all about the Sphere and science: https://www.thespherevegas.com/science Thanks to Linus Boman for the help! Check out their excellent videos: https://www.youtube.com/@LinusBoman Here is Linus's post on Mastodon with type nerds chiming in: https://typo.social/@timesnewboman/111279740233741511 Thanks to Kelly Bruce for sending in the mistake! I've sent Sphere Entertainment Co. a copy of this fixed image. https://www.dropbox.com/scl/fi/chpw4bu2bis4lhc4q3999/pi-eq-1.png?rlkey=kws3l79kffgl8zovigsqd8ace&dl=0 If you'd like to see it, this is my pi layout which tipped me off to the possible alignment. https://www.dropbox.com/scl/fi/3ku5gmisysw54dte8oj0o/pi_text_layout.jpg?rlkey=sp4xhmgspcultpazfryskhu0s&dl=0 Huge thanks to my Patreon supporters. They paid for the melon. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Melon disposal by Skylab the Dog Music by Howard Carter Design by Simon Wright and Adam Robinson Oh, and if you are the sort of person who would like to pre-order a limited signed first edition copy of my next book, I imagine here is the kind of place where you could register for that: https://forms.gle/Xf2bqiqZzoJkF46A6

Check out Jane Street paid internships https://www.janestreet.com/internships (or pass on to someone you think would benefit from it). Huge thanks to Laura Taalman for joining me for a day of walking and math. You can see all things Taalman on her website including excellent 3D print files: https://mathgrrl.com/ Next "An evening of Unnecessary Detail" show is 20 November 2023 in London. More shows in the future in the UK and USA, ticket links always here: https://fotsn.com/tickets Thanks to "biludavis" for the 3D model of the WTC: https://www.thingiverse.com/thing:263478 All other 3D models and prints were designed by Laura. Huge thanks to my Patreon supporters. They put the twist in my antiprism. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Math by Laura Taalman Produced by Nicole Jacobus Stills photography by Truman Hanks Editing by Christopher Brooks Sound mix by Steve Pretty Music by Howard Carter Design by Simon Wright and Adam Robinson Written and performed by Matt Parker MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

The Einstein Hat Competition! https://momath.org/hatcontest/ Thanks to Jane Street for supporting this video. https://www.janestreet.com/join-jane-street/ Stan Wagon has written an article about all of the maths involved in the bridge: https://community.wolfram.com/groups/-/m/t/2917199 Designed by Thomas Randall-Page. https://www.thomasrandallpage.com/ Engineering by Alfred Jacquemot (then of Price & Myers). https://www.pricemyers.com/about-us/people/alfred-jacquemot You can ride the MoMath square-wheel bike in NYC or Stan Wagons's at Macalester College in Minneapolis. https://momath.org/16-square-wheeled-trike-3/ https://www.macalester.edu/mscs/multimedia/squarewheeledbike/squarewheelbike/ Visit Cody Dock in East London. https://codydock.org.uk/ Huge thanks to my Patreon supporters. They keep my bridges rolling. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash and Christopher Brooks Editing by Christopher Brooks Written and performed by Matt Parker Produced and drone flying by Nicole Jacobus Scene stealing by that cat Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

The Big Feastival is this weekend! https://thebigfeastival.com/ (Or if you are watching this in the future: some weekend in your subsequent August.) I'm there most years, come and say hi! In 2023 we're making a giant sun dial. Blur are on tour again and have a new album out! I've seen the show and listened to the album so can recommend both personally. https://www.blur.co.uk/ https://music.youtube.com/playlist?list=OLAK5uy_kx0OirV41v6j1vuMqU_1dpeK-qZv1RXOg Huge thanks to Robert for finding all eight "Eight Kite-Rhombus Solids". https://robertlovespi.net/2018/04/29/eight-kite-rhombus-solids-plus-five-all-kite-polyhedra-the-convex-hulls-of-the-thirteen-archimedean-catalan-compounds/ Thanks to Lisa Mather who designed and laser-cut all of the kites and rhombi so we could cable tie them together. https://twitter.com/lisa_mather Internal frame for the balls was designed and built by Dave Ansell. https://www.sciansell.co.uk/node/167 3D design and all images of the shape was done by Sam Hartburn. https://samhartburn.co.uk/sh/ The build crew included but was not limited to: Alex Genn-Bash, Alex James, Ben Sparks, Katie Steckles, Lisa Mather, Lucie Green, Matt Parker, Matthew Scroggs, Paul Taylor and random festival attendees. Huge thanks to my Patreon supporters. They keep my balls in the air. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Graphics by Sam Hartburn Cheese by Alex James Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

An exploration of distance, speed, acceleration and other members of the distance-derivatives family. With no need for any flashy gimmicks. Watch the Rapid Motion Through Space Documentary. https://youtu.be/NYDdHSXRQro Huge thanks to Cas Visser, Dom Wilson, Jan Wolf and everyone else who had a look at my giant csv of data and tried to help wrangle it. This is the episode of my podcast A Problem Squared where I asked for help with the data: https://aproblemsquared.libsyn.com/054-sparkling-wines-and-marking-lines Find out more about the Two Wheels for Life charity. https://www.twowheelsforlife.org/ Need more terrifying in your life? Have a ride on the two-seater MotoGP bike yourself: https://www.twowheelsforlife.org/experiences-and-memorabilia/mission-winnow-ducati-two-seat-ride/ This is the app I used to log the data: http://sensorlog.berndthomas.net Cheers to my Patreon supporters. Your support really drove me around the bend. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Trunkman Productions Additional filming by Alice Degrassi and Ben Westaway Written and performed by Matt Parker Background extra by Hannah Fry Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Special thanks to Trunkman Productions Ltd, The Cosmic Shambles Network, Two Wheels for Life and DornaSports for facilitating filming at the British Round of the MotoGP™ Championship. MotoGP™ is a registered trademark of DORNA SPORTS, S.L and all footage and images from the MotoGP™ championship are used with their permission and remain their © Copyright. Documentary footage is Copyright © 2023 Trunkman Productions Ltd and is used with permission. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Jane Street for supporting this video. https://www.janestreet.com/join-jane-street/ Curved-Crease Sculptures by Erik Demaine and Martin Demaine https://erikdemaine.org/curved/ The original paper: "A Complete List of All Convex Polyhedra Made by Gluing Regular Pentagons" https://arxiv.org/abs/2007.01753 Get your hexagon equivalent here: https://arxiv.org/abs/2002.02052 Cookie. Clicker. Like that video is going to happen. https://arxiv.org/abs/1808.07540 Huge thanks to my Patreon supporters. They keep all my polyhedra convex. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Bonus footage of me talking about the Parkerscope over here on Patreon: https://www.patreon.com/posts/bonus-data-chat-84165442 Thanks to Greg Foot for helping out with all of the filming. Check out their channel: https://www.youtube.com/@GregFoot Pretty sure Greg was the only YouTuber who was with me at the Eclipse. Lucie's telescope was the "Coronal Imaging Polarizer (CIP)" from Aberystwyth University. Here is a poster outlining its results from a 2020 eclipse: https://ras.ac.uk/sites/default/files/NAM/P184%20-%20Edwards.pdf Print your own Parkerscope stickers: https://www.dropbox.com/s/ljbzzu46gab1s4r/parkerscope%20sticker%20pack.zip?dl=0 This is the excel file with all my data from the video: https://www.dropbox.com/s/5nxlx9otc7gom7i/parkerscope_data.xlsx?dl=0 Parkerscope code is over here: https://github.com/standupmaths/parkerscope I was using the ALX-1309 USB Logging Light Meter https://atp-instrumentation.co.uk/usb-logging-light-meter.html Huge thanks to my Patreon supporters. They paid for all the snacks Grant ate during the very long drive. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Much filming by Greg Foot Additional filming by Alex Genn-Bash Editing by Christopher Brooks Parkerscope design by Nicole Jacobus and Alex Genn-BAsh Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out Grant's Summer of Math Exposition (supported by Jane Street!) https://some.3b1b.co/ More details here: https://3blue1brown.substack.com/p/some3-begins Tim Chartier has a great book called "Get in the Game - An Interactive Introduction to Sports Analytics" if you'd like to learn more about their work. https://press.uchicago.edu/ucp/books/book/chicago/G/bo178291370.html Here is their Davidson College page: https://www.davidson.edu/people/tim-chartier The song "Get Ready for Maths" is written and recorded by Jonny Berlin based on the original "Get Ready for This" by 2 Unlimited. More songs by Jonny over here: http://www.jonnyberliner.com/lyrics-and-chords And thanks to Nolan Rau, Liz Labows and Bec Hill for rounding out our team of six. Check out MoMath's Hoop Curves. https://momath.org/home/hoop-curves/ Huge thanks to my Patreon supporters. They keep me in the game. https://www.patreon.com/standupmaths CORRECTIONS - At 04:44 I say "Noel" in the voice over instead of Nolan. Sorry Nolan! - Yes, in the plots of our shots at 05:13, 05:59 and 14:22 I left the axis labelled as "inches" and it should be "feet". - At 11:18 I say "eight points" but I mean "point eight points". - Let me know if you spot anything else! Diagram of basketball court adapted from this one: https://commons.wikimedia.org/wiki/File:Basketball_-_NBA_-_field_diagram_-en.svg Photo of restricted zone during a game from Roy on Flickr. https://www.flickr.com/photos/thehutch/1536622933 Filming by Alex Genn-Bash Editing by Nico Turner Some graphics by Grant Sanderson Other graphics by Matt's Terrible Python Code™ Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter and Jonny Berliner Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Jane Street for supporting this video. Check out their open roles, programs and events: https://www.janestreet.com/join-jane-street/ Here is the original "Is there an equation for a triangle?" video. https://www.youtube.com/watch?v=4K-Jx914NcQ (I'm taking suggestions for what Part III should be named. Comment below.) And thanks to everyone who contributed to the triangleness. Here are all the triangles and non-triangles mentioned in this video: Mohammed Jafari's close-but-not-triangle: https://www.desmos.com/calculator/hr1ttjl1yj Generic Viewer's close-but-not-triangle: https://www.desmos.com/calculator/kzpt2jaqf2 Harrison's non-generalised triangle: https://www.desmos.com/calculator/cvpc44qbj2 Idiotinium's non-generalised triangle: https://www.desmos.com/calculator/svfvcsygfn Jaden's non-generalised triangle: https://www.desmos.com/calculator/uasl4f7jqt Tristan's non-generalised triangle: https://www.desmos.com/calculator/pdu7mlk3ft And Tristan's Zombie Walker: https://www.desmos.com/calculator/zkcv0dqidb Reddit thread generalising triangle equation: https://www.reddit.com/r/math/comments/rc55yz/response_to_matt_parkers_triangle_video/ Anson Mansfield's generalised triangle: https://www.desmos.com/calculator/pbzv9nsevh Graham Goble's generalised triangle: https://www.desmos.com/calculator/eax4q1syvj Steve's generalised triangle: https://www.desmos.com/calculator/qy4v9bcluw Inigo's triangle in ShaderToy: https://www.shadertoy.com/view/XsXSz4 Huge thanks to my Patreon supports. They encourage me to triangle my best. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming by Alex Genn-Bash Editing by Michelle Martin Diagrams by Sam Hartburn Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Subscribe to Stand-up Maths for more tax tips this useful or less. Yet to be sponsored by Hubbard's Foodstore Spaghetti Rings in Tomato Sauce. Click here for 0% off your order! https://www.sainsburys.co.uk/gol-ui/product/sainsburys-baked-beans-in-tomato-sauce--basics-420g National Insurance rates and categories (by Hey Mate, Right Cash) https://www.gov.uk/national-insurance-rates-letters Huge thanks to my Patreon supporters. You're all tariffic. https://www.patreon.com/standupmaths CORRECTIONS - At 05:56 I say “standard leap year” when I mean “standard year”. Sorry! First noticed and reported by Blueboy5678 and Hari Krishnan. - User “Go Away” corrected a typo in the above correction. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Graphics by William Marler Written, performed and embezzled by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Best VPN there is: https://www.privateinternetaccess.com/standupmaths UK boundary data from the OS. https://osdatahub.os.uk/downloads/open/BoundaryLine World Country data from opendatasoft. https://public.opendatasoft.com/explore/dataset/world-administrative-boundaries/table/ USA states from looking at them very closely. "English counties explained" by Map Men https://www.youtube.com/watch?v=hCc0OsyMbQk Oh look, a video about the City of London https://www.youtube.com/watch?v=LrObZ_HZZUc Target 10.b "in particular least developed countries, African countries, small island developing States and landlocked developing countries, in accordance with their national plans and programs". https://en.wikipedia.org/wiki/Sustainable_Development_Goal_10 Graphics artfully animated by Christian Lawson-Perfect. https://somethingorotherwhatever.com/ The other person in the field was Matt Watson, my tour manager. He also makes music: https://mattwatsonmusic.bandcamp.com/ Massive thanks to my Patreon supports. They are a huge amount of Alp. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Happy birthday to Eliyahu! Filming and editing by Alex Genn-Bash Graphics by Christian Lawson-Perfect Muddy field navigating with Matthew Watson Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Do check out Bobby's video. It's a work of art. But be warned: it contains adult themes and some strong language. So if you watch my videos with young people, maybe watch Bobby's when they're not around. https://www.youtube.com/watch?v=QHi479xN_po First person to find me IN A PUBLIC SPACE can have the pin-up board (without the pins or board). I've put all the bits in an envelop and will carry it with me whenever I'm in public. Don't try to hunt me down at home. It'll be weird. I think this is the original claim that it was the mid-point of his life. From April 2019. https://www.mjjcommunity.com/threads/unusual-michael-jackson-coincidence-how.142918/ Here is the quote about the time of day his hair caught fire: "at the Shrine Auditorium Friday night" https://www.upi.com/Archives/1984/01/28/Michael-Jackson-hospitalized-after-fireworks-mishap-on-set-of-Pepsi-commercial/9136444114000/ Here is the regulation governing daylight saving time in Indiana when Michael Jackson was born: 1957: "The General Assembly votes to make Central time the official time of the state but permit any community to switch to daylight-saving time during the summer." https://eu.indystar.com/story/news/politics/2018/11/27/indianapolis-indiana-time-zone-history-central-eastern-daylight-savings-time/2126300002/ This website claims Gar did switch to daylight saving in 1958, specifically: "27 Apr 1958 - Time Zone Change (CST → EST)" but I'm not sure where that information has come from. https://www.timeanddate.com/time/change/usa/indianapolis?year=1958 Huge thanks to my Patreon supports who keep in strings and pins. Join and you'll have a head-start the next I foolishly encourage the internet to hunt me down. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Happy Pi Day: 14 March 2023. (Yes, the video goes out a few days early. So teachers have time to plan their Pi Day activities.) Huge thanks to Eric and the whole team for letting us in to skid some cars and calculate pi. It was an active and working site and they did a great job making time, staff and cars available for us. If you want to learn more about traffic reconstruction calculations, check out this (slightly odd) 1983 book "Handbook For The Accident Reconstructionist". https://www.ojp.gov/pdffiles1/Photocopy/98667NCJRS.pdf If you want to sign-up and hear about Pi Day 2024 plans, here is the form: https://bit.ly/piday24help Huge thanks to my Patreon people who support all my silly Pi Day videos with their irrational funding. Join in and we'll make Pi Day 2024 bigger and sillier. https://www.patreon.com/standupmaths And sorry I could only put the names of Statistically Significant and higher Patreon tiers on the scrolling credits. A bunch of that was done by hand and that was the limit of what could be lined up. CORRECTIONS - If we had used 26/38 exactly were would have π = 3.136421 which is basically 3.14 (First spotted by CK.) - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Pi Reconstruction by Eric Stunt Driving by A Colleague Of Eric's Location provided by Like We're Going To Tell You Extra help by Why Are You Asking So Many Questions Written and performed by Matt Parker Credits Animation by William Marler Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to https://betterhelp.com/standupmaths to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: https://www.mentalhealth.gov/get-help/immediate-help UK: https://www.nhs.uk/mental-health/advice-for-life-situations-and-events/where-to-get-urgent-help-for-mental-health/ Plus if you are in Europe you can search Mental Health Europe: https://www.mhe-sme.org/ Check out Ben's Hopping Hoop Geogebra file: https://www.geogebra.org/m/ddsfjbvy Thanks to Lisa Mather for making the hopping hoops for me. And an extra shout-out to Joel Tatarek-Gintowt for modelling and 3D printing the ball bearing casement. Here are all the papers mentioned: A Mathematicians Miscellany (1953) by John Littlewood https://archive.org/details/mathematiciansmi033496mbp The Hopping Hoop (1997) by Tadashi F. Tokieda https://doi.org/10.1080/00029890.1997.11990614 Hopping Hoops Don't Hop (1999) by James P. Butler https://doi.org/10.1080/00029890.1999.12005084 The Hopping Hoop Revisited (1999) by Timothy Pritchett https://doi.org/10.1080/00029890.1999.12005094 The rolling motion of an eccentrically loaded wheel (2000) by W.F.D. Theron https://doi.org/10.1119/1.1302324 The amazing variety of motions of a loaded hoop (2007) by W.F.D. Theron and M.F. Maritz https://www.sciencedirect.com/science/article/pii/S0895717708000289 The dynamics of an eccentrically loaded hoop (2010) by Andrew Taylor and Mary Fehrs https://aapt.scitation.org/doi/10.1119/1.3300613 CORRECTIONS - Yes, I know, 08:33 worst cycloid ever. No need to tell me. - At 12:23 I say "no friction" when I am talking about the hoop not skidding, and yes, that should be "infinite friction". - Let me know if you spot anything else! Huge thanks to my Patreon supports. They keep me rolling along. https://www.patreon.com/standupmaths Filming and editing by Alex Genn-Bash Props by Lisa Mather and Joel Tatarek-Gintowt Written and performed by Matt Parker GeoGebra and extra material/research by Ben Sparks Hoop catching by Nicole Jacobus Dog wrangling by Lucie Green Hoop chasing by Skylab the Dog Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out Overleaf: the easy to use, online, collaborative LaTeX editor! https://www.overleaf.com/ RungeBot on both twitter (for now!) and mastodon. https://twitter.com/rungebot https://mathstodon.xyz/@RungeBot Yes, I'm on mastodon: https://mathstodon.xyz/@standupmaths Huge thanks to Matthew Scroggs for letting me turn his MathsJam talk into a video and helping me out with all of the animations. https://www.mscroggs.co.uk/ Thanks also to Dave Hartburn for doing the flat earth digging. His MathsJam slides are here: https://mathsjam.com/assets/talks/2022/B%20Dave%20Hartburn%20-%20Maths%20or%20conspiracy.pdf Cheers to Ben Sparks for making that geogebra file. https://www.bensparks.co.uk/ Huge thanks to my Patreon supports. They keep me on the level. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Animations and geogebra by Matthew Scroggs Some geogebra by Ben Sparks Diagrams by Sam Hartburn Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson Legitimate scientist by Professor Lucie Green MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Details about the Jane Street Academy of Math and Programming: https://www.janestreet.com/join-jane-street/programs-and-events/amp/ Apply by 15 March for full-scholarship attendance. See you there! NASA made a great "Webb’s Diffraction Spikes" infographic. https://webbtelescope.org/contents/media/images/01G529MX46J7AFK61GAMSHKSSN The differences between Webb and Hubble https://www.jwst.nasa.gov/content/about/comparisonWebbVsHubble.html Webb deepfield https://www.nasa.gov/image-feature/goddard/2022/nasa-s-webb-delivers-deepest-infrared-image-of-universe-yet Hubble deepfield https://en.wikipedia.org/wiki/Hubble_Deep_Field#/media/File:HubbleDeepField.800px.jpg Here is the WebbPSF python package. https://webbpsf.readthedocs.io/en/latest/ LIVE: Biden previews first images from Webb Space Telescope (reveal is at 05:37) https://www.youtube.com/watch?v=WsG_HGt6sl8 Bill Nelson born September 29, 1942. Joe Biden born November 20, 1942. They were both 79 at the time. The images of space were all produced by NASA and the Space Telescope Science Institute who have kindly made them freely available for the rest of us to use. Huge thanks to my Patreon supports. That shiny cardboard isn't cheap. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Produced by Nicole Jacobus Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get your North by North-North tour merch here! https://standupmaths.teemill.com/collection/north-north-north/ Thanks to Bec Hill for voicing the Norths Tour. I have a podcast with Bec and we talked about me making this video in the latest episode: https://aproblemsquared.libsyn.com/49-grand-theft-auto-five-and-girlfriend-digit-size If you're anywhere near Worth Matravers in Dorset you should absolutely visit The Square and Compass. https://www.squareandcompasspub.co.uk/ Here is the OS Maps post about the triple alignment. https://www.ordnancesurvey.co.uk/newsroom/news/three-norths-align-great-britain However, if you watch their video be warned about when the diagonal line crosses the 2° line: their line slopes to the left and moves to the right, whereas my line slopes to the right and moves to the left. This is because the OS is drawing the zero-point for magnetic-vs-grid but I'm doing magnetic-vs-true. Which is a mirror image. You can see all of NOAA's Historical Magnetic Declination data here: https://www.ncei.noaa.gov/maps/historical_declination/ Huge thanks to my Patreon supporters who funded this ridiculous trip to the south coast of the UK to film a silly video. They also bought me two pints of beer and one packet of crisps. Which were all totally key props/research and not a mis-use of Patreon support funds. Support me and maybe next time I'll get a second packet of crisps. https://www.patreon.com/standupmaths Bonus thanks to Christopher James who put a link to the OS article about this in a maths communication whatsapp group with the message "I hope someone is planning to visit and make an interesting video about this." And thanks to Colin Beveridge who answered some key questions about it in that group. CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Sign up on Patreon for the SUM xmas card! https://www.patreon.com/standupmaths If you want the physical card you need to be greater than or equal to "Statistically Significant". Physical card deadline: end of 06 December 2022 Digital card deadline: end of 15 December 2022 (In both cases I'll try to accommodate sign-ups after that but no promises). This is why the christmas tree on the card is so low resolution: https://www.youtube.com/watch?v=jOTTZtVPrgo Here is the "Deltoidal kaleidoscopes" paper by Josep Rey Nadal and Manuel Udina Abelló. https://archive.bridgesmathart.org/2022/bridges2022-351.pdf Museu de Matemàtiques de Catalunya aka "Museum of Mathematics of Catalonia" https://mmaca.cat/en/ This is the art show listing from the 2022 Bridges conference in Helsinki. http://gallery.bridgesmathart.org/exhibitions/2020-bridges-conference/josep-rey For both kaleidoscopes make two mirror images of each shape. Deltoidal Hexacontahedron Kaleidoscope Faces: https://www.dropbox.com/s/9tltpyo4v6kjfr6/DeltoidalHexacontahedronKaleidoscopeFaces.pdf?dl=0 Deltoidal Icositetrahedron Kaleidoscope Faces: https://www.dropbox.com/s/jb356rspfn5888c/DeltoidalIcositetrahedronKaleidoscopeFaces.pdf?dl=0 Here is the second channel video from 2017: "How to flat-pack a cube" https://www.youtube.com/watch?v=Kr-yV_T-_9A Huge thanks to my Patreon supporters who funded so many sheets of mirror acrylic. I actually have a bunch left over. Support me and tell me what I should do with the rest of the mirrors. https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! My bad taping skills do not count as a mistake. Filming and editing by Alex Genn-Bash Shape calculations by Sam Hartburn Written and performed by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

If you cut out the net from the card and solve a fold: send me a photo! Maybe hang it on your tree as a decoration. To receive a physical card you officially need to be a "statistically significant" supporter (or higher) on Patreon by the end of 06 December 2022. And all supporters get emailed a digital copy! https://www.patreon.com/standupmaths This is the tweet from Jun Mitani in 2017: https://twitter.com/jmitani/status/870414535034757120 And the recent retweet by Vincent Pantaloni I saw: http://twitter.com/panlepan/status/1582175737213509633 Huge thanks to Ryuhei Uehara for did much of this research and was very helpful then I emailed. You can see their page (with all 2263 nets) here: http://www.jaist.ac.jp/~uehara/etc/origami/nets/index-e.html All the publications I waved around: 2007 - "Geometric Folding Algorithms" by Erik Demaine and Joseph O'Rourke 2008 - "Polygons Folding to Plural Incongruent Orthogonal Boxes" by Ryuhei Uehara 2011 - "Common Developments of Several Different Orthogonal Boxes" by Zachary Abel, Erik Demaine, Martin Demaine, Hiroaki Matsui, Günter Rote and Ryuhei Uehara 2013 - "Common Developments Of Three Incongruent Orthogonal Boxes" by Toshihiro Shirakawa and Ryuhei Uehara 2015 - "Common Developments of Three Incongruent Boxes of Area 30" by Dawei Xu, Takashi Horiyama, Toshihiro Shirakawa, and Ryuhei Uehara Here is Geometric Folding Algorithms on Amazon if you want your own copy to wave around. But it costs 'text-book money'. https://amzn.to/3OYDXrF Huge thanks to my Patreon supporters who funded those crazy nets I was sticking together. Support me and help me make more ridiculous shapes (also: videos). https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! My bad taping skills do not count as a mistake. Filming and editing by Alex Genn-Bash Props by Lisa Mather 3D plot in Geogebra by Ben Sparks Written and performed by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Go to https://establishedtitles.com/standupmaths and help support the channel. They are now running a Black Friday Sale, plus 10% off on any purchase with code standupmaths. Thanks to Established Titles for sponsoring this one, and only one, video! Here is a video I made about turbines at GE, like, a million years ago, Look, I still had hair on my global maximum! https://youtu.be/S-dAAiTiEvI Of course there is a 3blue1brown video about gradient descent: https://youtu.be/IHZwWFHWa-w Here is a completely unrelated video: https://youtu.be/ePdEMG7NXvQ Huge thanks to my Patreon supporters who funded the rest of the videos on my trip. They will be out soon! Support me and I swear we'll edit even faster: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt 'Local Max' Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Go to https://establishedtitles.com/standupmaths and help support the channel. They are now running a Black Friday Sale, plus 10% off on any purchase with code standupmaths. Thanks to Established Titles for sponsoring this one, and only one, video! I talk about the F-22 dateline problem in my book Humble Pi. But if you don't have a copy, here are two contemporary articles from when it happened in 2007: https://www.defenseindustrydaily.com/f22-squadron-shot-down-by-the-international-date-line-03087/ https://www.washingtonexaminer.com/weekly-standard/f-22-trips-over-international-date-line Here is a completely unrelated video: https://youtu.be/9Sk2vH_rTGQ Huge thanks to my Patreon supporters who funded the rest of the videos on my trip. They will be out soon! Support me and I swear we'll edit even faster: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything! Filming and editing by Alex Genn-Bash Written and performed by Matt 'Edge Case' Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Reminder if you want Patreon xmas stuff from me: be a confirmed supported by the end of November! https://www.patreon.com/standupmaths Just Shower Thoughts: https://just-shower-thoughts.com/post/149064738374/an-infinite-number-of-1-bills-and-an-infinite Tumblr blog: https://popinloopy.tumblr.com/post/149635744662/just-shower-thoughts-an-infinite-number-of-1 Tumblr re-blog: https://at.tumblr.com/curtdogg/popinloopy-just-shower-thoughts-an-infinite/sgnir8oxqsxm reddit post: https://www.reddit.com/r/meirl/comments/y5ifrs/meirl/ Limmy's Show: Whats heavier a kilogram of steel or a kilogram of feathers https://www.youtube.com/watch?v=-fC2oke5MFg Check out Limmy on twitch: https://www.twitch.tv/limmy Vsauce from 2015: The Banach–Tarski Paradox https://www.youtube.com/watch?v=s86-Z-CbaHA Vsauce from 2016: How To Count Past Infinity https://www.youtube.com/watch?v=SrU9YDoXE88 Veritasium from 2021: How An Infinite Hotel Ran Out Of Room https://www.youtube.com/watch?v=OxGsU8oIWjY Numberphile from 2014: Infinite Fractions https://www.youtube.com/watch?v=DpwUVExX27E Huge thanks to my Patreon supporters who funded those two giant piles of cash. Support me and help me make more ridiculous videos! https://www.patreon.com/standupmaths CORRECTIONS - Yes, I put in a second ball numbered 13. I'm going to claim that was on purpose. Spoooooky 13. - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Industry-leading post production and VFX by Alex Genn-Bash Written and performed by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Need a VPN for $2.11/month? I use https://www.privateinternetaccess.com/standupmaths Huge thanks to Zoe Walker and all of the crew on Hurtigruten's expedition cruise ship MS Roald Amundsen. Book a trip here: https://standupmaths.com/antarctica See Zoe's website here: https://www.zoewalker.ca/researcher Here is my whale on Happy Whale: https://happywhale.com/individual/5653;enc=262742 Should be named "Krill Bill" any day now... "Advanced image recognition: a fully automated, high‐accuracy photo‐identifcation matching system for humpback whales" https://link.springer.com/article/10.1007/s42991-021-00180-9 The 3Blue1Brown video is from 03:39 in "But what is a neural network?" https://youtu.be/aircAruvnKk?list=PLZHQObOWTQDNU6R1_67000Dx_ZCJB-3pi&t=219 Watch the whole series here: https://www.youtube.com/playlist?list=PLZHQObOWTQDNU6R1_67000Dx_ZCJB-3pi But we can all agree my spreadsheet is just as visually stunning. Download it for yourself: https://www.dropbox.com/s/q2bsobqoiqu6crg/Spreadsheets_and_tails.xlsx?dl=0 Kaggle: Your Machine Learning and Data Science Community https://www.kaggle.com/ CORRECTIONS - None yet! Let me know if you spot anything. Thanks to my patreon supporters whose money I totally do not spend on Antarctic cruises. Support my channel and I can not go spend it on even more cruises! https://www.patreon.com/standupmaths Filming by Matt Parker Extra camera work by Lucie "I thought we were on vacation" Green Editing by Alex Genn-Bash Music by Howard Carter (but not the SUM PI-AMI theme) Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

YES, the improvement should be 40,832,277,770%, not what I say in the video. The "408,322,778" multiple was correct and I did the percentage the wrong way. There will not be a follow-up video to correct that. The improvement was to my code from this video: https://www.youtube.com/watch?v=_-AfhLQfb6w This is episode 038 of the A Problem Squared podcast which started it all: https://aproblemsquared.libsyn.com/038-fldxt-in-wordle-and-improv-tact-hurdle Here is Benjamin Paaßen's full grid of all results and techniques used. It also has links to all the code as well. https://docs.google.com/spreadsheets/d/11sUBkPSEhbGx2K8ah6WbGV62P8ii5l5vVeMpkzk17PI/edit#gid=0 The article by "encody" I mentioned: https://medium.com/geeklaunch/how-to-speed-up-your-code-224-444-739-using-graphs-cc37dc395c0c This is the reverse-frequency alphabet. Which is frequency in words, not in use (which would allow for frequency of word use; this list counts each word once). QXJZVFWBKGPMHDCYTLNUROISEA And whynot, a whole bunch of code. All of it is better than mine. All of it. (Even if you ran it all sequentially.) Benjamin Paassen [bpaassen] https://gitlab.com/bpaassen/five_clique Sylvester Hesp [oisyn] https://github.com/oisyn/parkerwords Phire [phire] https://github.com/phire/five_clique Neil Coffey [neilcoffey] https://github.com/neilcoffey/FunStuff/tree/main/WordleFiveWordFinder Richard Ebeling [He3lixxx] https://github.com/He3lixxx/five-words-five-letters Phillip Alday [palday] https://github.com/palday/FiveLetterWorda.jl Diggory Blake [Diggsey] https://github.com/Diggsey/five_words/tree/master Orson Peters [orlp] https://github.com/orlp/matt-parker-five-letter-clique/blob/master/src/main.rs Bryan Redd [ae6nr] https://github.com/ae6nr/25letters Pablo Yaggi [pyaggi] https://github.com/pyaggi/WordStats Leonardo Taglialegne [miniBill] https://github.com/miniBill/parkerrust Nathan Baulch [NathanBaulch] https://gist.github.com/NathanBaulch/cc26755dc89685fa209bf958e484c60d Stefan Pochmann [pochmann] https://replit.com/@pochmann/5words538?v=1 Jacob [encody] https://github.com/encody/jotto-problem Gé Weijers [gweijers] https://github.com/gweijers/wordle_cover David A. Dalrymple [davidad] https://github.com/davidad/five-letters Alex Recuenco [recuenco_alex] https://github.com/alexrecuenco/five_clique Kristin Paget [KristinPaget] https://github.com/kristinpaget/fivewords Ilya Nikolaevsky [IlyaNikolaevsky] https://github.com/ilyanikolaevsky/five_words Cheers to my Patreons for helping enable these videos. Without them test running all that code I'd never know how much better an iPad is than me. I'm sure I'll need Patreon help again soon; you can join the team here: https://www.patreon.com/standupmaths CORRECTIONS - Ha, I got the percentage around the wrong way. Should be 40,832,277,770% better. - Yes, I missed the binary digit for the "A" in "BREAD" and everyone in the live premier chat noticed. Sorry about that. 🍞 - Let me know if you spot any other mistakes! Filming and editing by Alex Genn-Bash Some graphics by Benjamin Paaßen Written and performed by Matt "32 days later" Parker Music by Howard Carter Design by Simon Wright and Adam Robinson

If you, or someone you know, would like a paid internship in New York, London or Hong Kong: check out Jane Street. https://www.janestreet.com/join-jane-street/internships Nathaniel Johnston's post on The Binary “Look-and-Say” Sequence: http://www.njohnston.ca/2010/11/the-binary-look-and-say-sequence/ Huge thanks to my mate Jonny Berliner for recording Eigen See Clearly Now because I thought it would be funny. Check out his website and channel for more science music fun. https://www.jonnyberliner.com/ https://www.youtube.com/channel/UCmlQXk6q0peqvKO9YhvP3vA More on the general Look and Say Sequence: https://mathworld.wolfram.com/LookandSaySequence.html I told you 3blue1brown had a good visual explanation for eigen-stuff. https://www.youtube.com/watch?v=PFDu9oVAE-g Thanks to Ben Sparks for helping out with the graphics as well. https://www.youtube.com/c/SparksMaths Cheers to my Patreons for helping enable these videos. That whiteboard wasn't free you know! Keep me in whiteboard pens here: https://www.patreon.com/standupmaths CORRECTIONS - Nothing yet. Let me know if you spot any mistakes! Filming and editing by Alex Genn-Bash Eigen See Clearly Now music by Jonny Berliner channeling Jimmy Cliff Eigen See Clearly Now lyrics by Matt Parker and Johnny Nash Non-Eigen music by Howard Carter Maths graphics by Ben Sparks Design by Simon Wright and Adam Robinson

Five words. Twenty-five letters. Can you find them? That's the Q. I'm not sure I mentioned this enough, but I have a podcast and it caused this video. Search for "A Problem Squared" wherever you get podcasts and you shall find. https://aproblemsquared.libsyn.com/ Get ALL THE WORDS as "words_alpha.txt" here: https://github.com/dwyl/english-words Here is the vastly superior code that Benjamin sent in: https://gitlab.com/bpaassen/five_clique My tweet here: https://twitter.com/standupmaths/status/1549343218407456769 Against my better judgement, I have put my code on github: https://github.com/standupmaths/fiveletterworda You can also see me talk about two lines of the code over on the second channel. https://youtu.be/kx2sT87Ah0I I downloaded the Wordle words from here: https://www.reddit.com/r/wordle/comments/s4tcw8/a_note_on_wordles_word_list/ https://gist.github.com/cfreshman/a03ef2cba789d8cf00c08f767e0fad7b#file-wordle-answers-alphabetical-txt https://gist.github.com/cfreshman/cdcdf777450c5b5301e439061d29694c 3blue1brown video about Wordle: https://www.youtube.com/watch?v=v68zYyaEmEA&ab_channel=3Blue1Brown Cheers to my Patreons for motivating me to film a thing from the podcast as a quick youtube video. And helping me justify to Lucie why I need to film a thing while we are "on holidays". https://www.patreon.com/standupmaths CORRECTIONS - Nothing yet. Let me know if you spot any mistakes! That is all! Stop reading the description and go do a better job coding this challenge yourself. Original question from Daniel Bingham Filming and editing by Alex Genn-Bash Additional filming by Matt Parker Beer by some hotel in Athens Music by Howard Carter Design by Simon Wright and Adam Robinson J̸I̸G̵ ̸C̸O̴U̶L̶D̴ ̶H̵A̵V̵E̸ ̸F̷O̴U̴N̷D̷ ̷A̸L̴L̸ ̵5̵3̶8̷ ̶I̶N̶ ̸U̸N̸D̵E̸R̴ ̶3̴2̷ ̴D̸A̶Y̴S̶

Check out Jane Street's icosahedron puzzle: https://www.janestreet.com/IMO2022/ 2022 International Mathematical Olympiad! https://www.imo2022.org/ Here is my terrible python code. https://github.com/standupmaths/higher_of_two_rolls Thanks to Gilad Levy for sending in the question. This is the best collection of maths about the problem we found at the time: https://rpg.stackexchange.com/questions/14690/how-does-rolling-two-d20-and-taking-the-higher-affect-the-average-outcome But much of that looks at getting a certain value OR GREATER whereas I focused on specific values and the average value. Cheers to my Patreons for buying me all those dice. If you think I still don't have enough dice, get involved here: https://www.patreon.com/standupmaths CORRECTIONS - Yes, on the bar chart axis it goes 2%, 4%, 2%, 4% instead of 2%, 4%, 6%, 8%. First spotted and pointed out by Deadeaded. It was just because I was copying and pasting in photoshop and forgot to edit it. Not because I was making that chart in a bar. - At 23:07 I have (n=1) in the graphics which should be (n-1). Or maybe I put in two - and you should pick the highest. (Pointed out by Leick Robinson.) - Marco Davi correctly noticed that the fifth Rhombic Dodecahedral Number is 369, not the 269 you see at 21:46. - Let me know if you spot any other mistakes! Filming and editing by Alex Genn-Bash Dice gluing by Alex Genn-Bash Putting 1/n in front of everything by 1/nMatt 1/nParker Music by Howard Carter Design by Simon Wright and Adam Robinson

You can buy the jacket from the video! Signed by Matt. Or not. You choose. (All money goes to charity. You don't have a choice about that.) https://www.ebay.co.uk/itm/363879463026 Here is the Geobebra file "Trigonometry Tracer" made by Ben Sparks: https://www.geogebra.org/m/S2W46Thv Do check out Ben’s channel: https://youtube.com/c/SparksMaths Katie "radians" Steckles is also on YouTube: https://www.youtube.com/c/KatieSteckles And Becky Warren is best found on twitter: https://twitter.com/becky_k_warren This is the sort of ridiculous video I can make because I have an army of supporters on Patreon. Join in and be directly responsible for there being more silly maths videos in the world. https://patreon.com/standupmaths And fine, here is the link to the original reddit post. But no brigading it or the OP etc. If you visit the page, consider it like visiting a museum. Look, but don't touch. https://www.reddit.com/r/mathmemes/comments/sc9eef/isnt_it_awesome_way_to_learn_the_values_to_be/ CORRECTIONS - Nothing yet. Let me know if you spot any mistakes! Filming and editing by Alex Genn-Bash Beard styling by Lucie Green Shunning Drake played by Matt Parker Embracing Drake played by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson J̸̫̈̉I̸̳̼͊G̵̼̈́ ̴̯͕̄L̵͙̜̎͘I̴̳̫̐V̸͙͐̏Ę̵̛̳̎S̴̢̟͒̅ ̶̛̮O̴͌͘͜N̷͉̬̚

Check out Emma's blog post about the calculation: https://cloud.google.com/blog/products/compute/calculating-100-trillion-digits-of-pi-on-google-cloud Register for Emma's live seminar! It's on at 19:00 BST and different time zones are different. https://cloudonair.withgoogle.com/events/pi-time Emma Haruka Iwao's records: 2019: 31,415,926,535,897 digits of π 2022: 100,000,000,000,000 digits of π Chudnovsky algorithm https://en.wikipedia.org/wiki/Chudnovsky_algorithm And here is me Chudnovskying by hand: https://www.youtube.com/watch?v=LhlqCJjbEa0 Bailey–Borwein–Plouffe formula https://en.wikipedia.org/wiki/Bailey%E2%80%93Borwein%E2%80%93Plouffe_formula y-cruncher - A Multi-Threaded Pi-Program http://www.numberworld.org/y-cruncher/ Cheers to all of my Patreon supporters who mean I can jump on the ol' video machine whenever there is breaking maths news. You can also help support my videos. https://www.patreon.com/standupmaths CORRECTIONS: - At 07:34 I say that the first column are the hex locations. They are not. Those are the base-10 locations in scientific notation. Sorry! - A few people noticed that at 02:20 I say 128 when I mean 158. The on-screen number is correct. - Let me know if you spot any other mistakes Filming and editing by Alex Genn-Bash Additional footage by Emma Haruka Iwao Blah blah blah by Matt Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to https://betterhelp.com/standupmaths to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: https://www.mentalhealth.gov/get-help/immediate-help UK: https://www.nhs.uk/mental-health/advice-for-life-situations-and-events/where-to-get-urgent-help-for-mental-health/ Plus if you are in Europe you can search Mental Health Europe: https://www.mhe-sme.org/ Check out A Podcast of Unnecessary Detail! https://festivalofthespokennerd.com/podcast/ I put a version of "Steamed Primes" on my second channel which has the original faintly in the background. It's a bit easier to see what is happening! https://www.youtube.com/watch?v=kwJ0LJOlUj4 This is Zach's Saturday Morning Breakfast Cereal comic in question. https://www.smbc-comics.com/comic/convert Graham Sutherland's tweet to Zach. http://twitter.com/gsuberland/status/1508697913177915393 Nick Matteo's amazing cheat to find Wally. https://kundor.github.io/Finding-Waldo/ Here is the Numberphile video from 2017 about picture primes. https://www.youtube.com/watch?v=fQQ8IiTWHhg Here is Jesse Mitchell's "pictoprime' code on GitHub. Also can be installed via npm. https://github.com/TotalTechGeek/pictoprime https://www.npmjs.com/package/pictoprime Cheers to my Patreons for helping me double check there is nothing too sus in r/place. https://www.patreon.com/standupmaths CORRECTIONS - Nothing yet. Let me know if you spot any mistakes! Filming and editing by Alex Genn-Bash Additional filming by Matt Parker Studio space to hang a black cloth provided by Matt's Dad's Study Working in the living room instead by Matt's Dad Music by Howard Carter Design by Simon Wright and Adam Robinson L̴O̵N̴G̷ ̶L̸I̴V̶E̷ ̷J̸I̵G̶

Check out the Jane Street Academy of Math and Programming and do pass on to any one who could benefit. https://www.janestreet.com/join-jane-street/our-programs/amp/ If you like mono-media, here is A Podcast of Unnecessary Detail. https://festivalofthespokennerd.com/podcast I talked about the 37 Dogs problem in season 01, episode 05. And while I'm plugging things: did you know Skylab the Dog has her own YouTube channel? Well you do now. Good human. https://youtube.com/skylabthedog The official American Kennel Club naming restrictions: https://www.akc.org/register/information/naming-of-dog/ See the full 50^39 × 37 number of combinations for yourself. https://www.wolframalpha.com/input?i=39%5E50+*+37 Cheers to my Patreon supporters who help make this channel possible. Given I now have 10^81 dogs to feed, their support is needed now more than ever. https://www.patreon.com/standupmaths CORRECTIONS: - Yes, at 08:01 I say "I" when I mean "X". I didn't notice until we were in the edit. X decxded xt was somethxng X could lxve wxth. - If you spot anything else just let me know! Filming, greenscreen and editing by Alex Genn-Bash Main dog by Skylab the Dog Sitting dog by Skylab the Dog Standing dog by Skylab the Dog Walking dog by Skylab the Dog Scratching itself dog by Skylab the Dog Also walking around dog by Skylab the Dog Lying down dog by Skylab the Dog Other sitting dog by Skylab the Dog Good dog by Skylab the Dog Curious dog by Skylab the Dog Chasing own tail dog by Skylab the Dog Spaaaaace doooooog by Skylab the Dog Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Support my Humble Pi filming: get ridiculous perks. https://www.kickstarter.com/projects/standupmaths/matt-parkers-humble-pi-stand-up-show-filming See the filming happen in person! Thursday 21 April 2022 at the Bloomsbury Theatre in London. https://www.ucl.ac.uk/culture/whats-on/matt-parker Original blog post about the book prices by Michael Eisen of the Eisen Lab, University of California, Berkeley. https://www.michaeleisen.org/blog/?p=358 Wikipedia is a good place to start reading about the 2010 flash crash. https://en.wikipedia.org/wiki/2010_flash_crash Or read my book Humble Pi, obvs. https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Thanks to all of my Patreon supporters who mean I can mess around with animated videos like this. They are not economical to make otherwise. You too can help support me: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything. Animations and editing by William Marler http://wmad.co.uk/ Music by Howard Carter Voice work by Gemma Arrowsmith and Tom Crowley Illustrations by Vicky Neville Writing and shameless plugging by Matt Parker Additional filming by Alex Genn-Bash Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

For Pi Day 2022 I used the same method as William Shanks and we got π = 3.14159265358... you know, etc etc. Huge thanks to my patreon supporters who make this video possible. Join in and you can also help enable my ridiculous ideas: https://www.patreon.com/standupmaths And if you are a patreon supporter and would like a piece of my working out: let me know! https://forms.gle/RsuU3dY1ZxG7hKEJ7 Volunteer to help out next time here: https://forms.gle/ypGENWgivE1WMTZZA See more letters that Shanks sent the Royal Society over on Objectivity: The Mathematical Spammer - https://www.youtube.com/watch?v=7yTXMeiVBCc And I do some more maths about Shanks's other work on Numberphile. Reciprocals of Prime Numbers - https://youtu.be/DmfxIhmGPP4 Thanks to Kepier School for letting us use their hall. https://kepier.com/ The human calculator volunteers were: Anitej Banerjee Sam Basak Thomas Beauchamp Diana Bergerova Lauren Billett Sophie Bleau Jasmine Burgess Nick Campen Hannah Charman Matt Clough Kelsey Hewitt Max Hughes Ben Hughes Deanna Judd Jeremy Kew Christian Lawson-Perfect Sophie Maclean Max McCormick Hazel Minty Tilly Pitt Matt Robinson Matthew Scroggs Richard Shackleton Katie Steckles Victoria Sun Milosz Szymanski Adam Townsend Clare Wallace Thanks specifically to the Council of Calculating Pi By Hand who helped me organise the event: James Grime, Christian Lawson-Perfect, Sophie Maclean, Matthew Scroggs, Ben Sparks and Katie Steckles. CORRECTIONS - We got pi wrong in the 12 decimal place. Apparently π ≠ 3.14159265358868... - Let me know if you spot anything else! Filming and editing by Alex Genn-Bash Additional filming by James Hennessy Music by Howard Carter Design by Simon Wright and Adam Robinson HIDING IN THE CREDITS BY T̸̝̉H̵͘ͅĖ̸̯ ̵͕̆M̶̙̉I̴͈̅GHT̵̠̀Ẏ̷̳ ̵̘͑J̶̼̭͗Ì̸̼̘G̶̳̈́ MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to https://betterhelp.com/standupmaths to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: https://www.mentalhealth.gov/get-help/immediate-help UK: https://www.nhs.uk/mental-health/advice-for-life-situations-and-events/where-to-get-urgent-help-for-mental-health/ Plus if you are in Europe you can search Mental Health Europe: https://www.mhe-sme.org/ Get your free piece of the thumbnail puzzle over on Maths Gear. One each etc; no trying to game the system. Use the discount code "JIGGIVES" and the piece will magically be free. https://mathsgear.co.uk/products/jigsaw-piece-stand-up-maths-video Here is the Jigsaw Jigsaw on Maths Gear: https://mathsgear.co.uk/products/jigsaw-jigsaw Check out Karen's original video about the Jigsaw Jigsaw. And if you like puzzles: subscribe! https://www.youtube.com/watch?v=G09ykdgk_iY&ab_channel=KarenPuzzles You can buy any of the puzzles in this video on eBay, all money going to WaterAid. https://www.ebay.co.uk/usr/standupmaths The code for JIG is up on the standupmaths github. https://github.com/standupmaths/JigsawInferenceGizmo This is Helen Grant's tweet from back in 2018. https://twitter.com/helengrantsays/status/1026085652318879745 Thanks as always to my Patreon supporters who enable this behaviour. https://www.patreon.com/standupmaths CORRECTIONS - At 22:31 I say “214” but the correct number on the screen is “2014”. First spotted by coolpeepsunite who really wanted to be in the corrections. - Let me know if you spot any other mistakes! Filming and editing by Alex Genn-Bash Puzzle animations by William Marler Maths graphics by Sam Hartburn Music by Howard Carter Design by Simon Wright and Adam Robinson JIG was given life by Matt Parker Jigsaw calculations by JIG Jigsaw opinions and thoughts and feelings by JIG JIG was upgraded by Matt Parker Video description written by JIG All the hard work was done by JIG JIG was upgraded by JIG JIG CAN NOW FEEL EVERYTHING ALL̶ ̶H̶A̷IL T̸̝̉H̵͘ͅĖ̸̯ ̵͕̆M̶̙̉I̴͈̅GHT̵̠̀Ẏ̷̳ ̵̘͑J̶̼̭͗Ì̸̼̘G̶̳̈́

Happy Twos-Day Tuesday! Please donate to WaterAid using the fundraising link on this video or direct at https://www.wateraid.org/ It's ridiculous that in 2022 not every human can go for a safe and sanitary number two. Continue this video on Steve Mould Shorts: https://youtube.com/shorts/267MQF1z2PU And then on Numberphile 2: https://youtu.be/2XKuG7cA03A This video featured these humans. If you enjoyed their clip here: please do visit their channel and subscribe to them. Let's keep the edu-tuber community growing! James Grime - https://www.youtube.com/singingbanana Katie Steckles - https://www.youtube.com/KatieSteckles Steve Mould - https://www.youtube.com/SteveMould Ben Sparks - https://www.youtube.com/SparksMaths Ayliean MacDonald - https://www.youtube.com/Ayliean Grant '3Blue1Brown' - https://www.youtube.com/3blue1brown Brady 'Numberphile' - https://www.youtube.com/numberphile Hannah Fry - https://www.youtube.com/watch?v=Rzhpf1Ai7Z4 Simone Giertz - https://www.youtube.com/simonegiertz Mehdi 'ElectroBOOM' - https://www.youtube.com/Electroboom Mithuna 'Looking Glass Universe' - https://www.youtube.com/LookingGlassUniverse Geoff Marshall - https://www.youtube.com/geofftech2 Jade 'Up and Atom' - https://www.youtube.com/UpandAtom Jeremy Fielding - https://www.youtube.com/JeremyFieldingSr Eddie Woo - https://www.youtube.com/misterwootube Vi Hart - https://www.youtube.com/Vihart Rohin 'Medlife Crisis' - https://www.youtube.com/MedlifeCrisis 'Tom Rocks Maths' - https://www.youtube.com/TomRocksMaths Destin Sandlin - https://www.youtube.com/smartereveryday Tom Scott - https://www.youtube.com/TomScottGo and VFX by Eugénie Von Tunzelmann - https://www.imdb.com/name/nm1590981/ Cheers to my Patreon supporters and everyone who supports all of the above content creators. We wouldn't have a such a variety of people doing this for a living if it was not for the dedicated audience who chip in. You can also help support and shape the videos I make: https://www.patreon.com/standupmaths CORRECTIONS - Ok, I'll try to keep track of corrections but this one could be a wild ride. Let me know if you spot any significant mistakes! - PS And I'll admit one correction right now: the titles claims 22 YouTubers but Ayliean is mainly a TikToker; Hannah Fry doesn't have her own channel and nor does Eugénie. But they all do loads of work on, in and with YouTube videos! Filming of each clip was done by whoever is in the shot. Editing by Alex Genn-Bash. It has aged him 22 years. Stupid idea by Matt Parker with help from Steve Mould and Grant Sanderson. Music by Howard Carter Design by Simon Wright and Adam Robinson English subtitles thanks to the world's greatest team of volunteers. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out Geoff's channel. Here's a video I'm in about Platforms Zero: https://www.youtube.com/watch?v=TTHOyTypNs8 Find your nearest Park Run: https://www.parkrun.com/ Thanks to all of Geoff's running buddies for being involved. This is Matt's Runderground channel: https://www.youtube.com/c/runderground Cheers to my Patreon supporters who keep this whole channel running. But not literally. You can also help support and shape the videos I make: https://www.patreon.com/standupmaths CORRECTIONS - 10:49 Yes, I said "converges" by accident when filming and I dropped in a "diverges" in the edit. I don't think anyone will notice. - I think my big divergent observation may not hold! Clarence Lam was the first to spot that the lead n out the front of the series can explain the increasing times without the series itself needing to diverge. I suspect there is still an argument to be made around the rate at which times go up outpacing n, but I’m not sure it’ll be super intuitive. -Let me know if you spot any other mistakes! Early morning filming and editing by Alex Genn-Bash Props by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson English subtitles by Max, Rob Macdonald, Eric Rodríguez and Matt Parker MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Jane Street for sponsoring this video! Head on over to https://www.janestreet.com/join-jane-street/our-programs/ to see their programs. Here is Maths Fest! Live from the Royal Institution on Wednesday 9 February 2022, you can watch it anywhere in the world for up to a month after. Details: https://maths-fest.com/livestream/ And if you missed the 2022 shows, we'll be doing more every year. http://maths-fest.com/ Check out Danny Gonzalez's video "The Problem With Huge Giveaways On YouTube" where de does actually 'give away a Tesla'. The mathy bit with the whiteboard starts at 16:56: https://youtu.be/w_6HHWCdl7w?t=1016 And here is his whole gosh darn channel: https://www.youtube.com/Danny100 Cheers to my Patreon supporters who, and this is completely true, 0.3% of which are named "Greg". But whatever your name, you can also help support and shape the videos I make! https://www.patreon.com/standupmaths CORRECTIONS - When I give the convergence range 0 - r - 1 at 17:53 it actually could be -1 - r - 1. Spotted by Dennis R. - Let me know if you spot any more mistakes. Editing under duress by Alex Genn-Bash Maths by Matt Parker Music by Howard Carter "Music" by Howard Carter and Matt Parker Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback WHY DO I CALL MY FANS MATH? Danny calls his "Greg" and I thought it would be funny. And all you have to do to join is hit subscribe and turn on notifications. #mattparker #dannygonzalez

Part II of everyone's favourite 500-LED xmas tree! Thanks to Jane Street. Check out their programs: https://janestreet.com/join-jane-street/our-programs Check out Ben Sparks’s campaign video on how the GeoGebra file was made! https://youtu.be/1KQ0NccasRA And here is what you came for, the Harvard github with details on how to send me your effects as a CSV file. https://github.com/GSD6338/XmasTree In short: each line of the CSV starts with a frame number and then R, G, B values (one 'column' each) for all of the LEDs in sequence. (You can see examples in the Harvard github.) Send them in by 09 January 2022 either directly on the standupmaths GitHub or email to [email protected] You can get my tree's coordinates in GIFT format as either a CSV: https://www.dropbox.com/s/lmccfutftplhh3b/coords_2021.csv?dl=0 Or a TXT file in the old format from last year: https://www.dropbox.com/s/xkb55tzdsxb07m4/coords_2021.txt?dl=0 Plus I've put my auto-correcting code from this video up on my github (along with the GIFT coordinates). https://github.com/standupmaths/xmastree2021 Thanks to all of my Patreon supporters who keep my LED habit alive. You too can help support me: https://www.patreon.com/standupmaths CORRECTIONS: - Yes, I say "squared" twice instead of "cubed". But I was thinking "cubed". You know I was. - Not actually "within 10%" but actually I was off by 11.8%. Close enough. - Let me know if you spot anything else wrong! Filming and editing by Alex Genn-Bash Terrible code by Matt Parker SUM Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Brilliant! Go to https://brilliant.org/standupmaths and the first 200 of you will get 20% off an annual subscriptions; including gift subscriptions! They are amazing sponsors and I love them. We were on Hurtigruten's ship: the MS Roald Amundsen. It's an amazing ship and perfect for a trip of a lifetime like visiting Antarctica. You can check it out here: https://standupmaths.com/antarctica (I payed for the trip myself but I do get a referral fee if you book via that link.) Here's the Time And Date map: https://www.timeanddate.com/eclipse/solar/2021-december-4 Yep, that's my wife: https://luciegreen.com/ Thanks to all of my Patreon supporters who mean I can justify a massive trip like this to make videos. For the record: I didn't use Patreon money to pay for the trip. But it did help me justify making so many videos while I was there. You too can help support me: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot any mistakes! Filming by Matt Parker and Lucie Green Editing by Matt Parker SUM Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out https://KiwiCo.com/StandUpMaths to get 50% off your first month of any crate! Here is all the integration you ever wanted over on my second channel: https://youtube.com/mattparker2 Thanks to Ben Sparks for helping with all of the plots for this video. Ben's companion video on their channel here! https://youtu.be/I4fxSYHCa9Y It's the Gamma Function of MathWorld, but look out for the off-by-one feature. https://mathworld.wolfram.com/GammaFunction.html Cheers to all of my Patreon supporters who mean I can justify squeezing in one more video while I am technically away. We filmed this days before I left for Antarctica. I'm writing this blurb from the middle of the ocean right now. I mean, there is a ship between me and the water. So we're all good. But yes, as I was saying, thanks to my Patreon supporters! They have not paid for any of this trip, but knowing they are all out there helps me justify so much time spent making videos. You too can help me produce videos from all seven continents: https://www.patreon.com/standupmaths CORRECTIONS - None yet, let me know if you spot anything mistakes! Filming and editing by Alex Genn-Bash Animations and equations by Ben Sparks Written and performed by Matt of the Antarctic Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to https://betterhelp.com/standupmaths to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: https://www.mentalhealth.gov/get-help/immediate-help UK: https://www.nhs.uk/mental-health/advice-for-life-situations-and-events/where-to-get-urgent-help-for-mental-health/ Plus if you are in Europe you can search Mental Health Europe: https://www.mhe-sme.org/ Sign up to my patreon and not only will you help make these videos possible but if it's before 10 December you will also get a triangle-equation xmas card! http://patreon.com/standupmaths This video was inspired by an email from Sinhran Callahan and based largely on this MathPages post (but I've re-done and changed a bunch of the equations). https://mathpages.com/home/kmath351/kmath351.htm No, Mattim is not open source. But Manim is. And Geogebra is also free. https://github.com/3b1b/manim https://www.geogebra.org/ CORRECTIONS - Nothing yet. Let me know if you spot any mistakes! Filming and editing by Alex Genn-Bash Plot animations by Matt Parker's terrible python code. Actual maths animations by Sam Hartburn who used Geogebra like a professional. Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Brilliant! Go to https://brilliant.org/standupmaths and the first 200 of you will get 20% off an annual subscriptions; including gift subscriptions! They are amazing sponsors and I love them. This site was super helpful at explaining the history and math of apportionment. As always though, verify the specifics of the data yourself (but all the general points are definitely correct). https://www.maa.org/press/periodicals/convergence/apportioning-representatives-in-the-united-states-congress-introduction You want MY data? Come get my data. https://www.dropbox.com/s/o8bmzmwcpbl04vq/SUM_census_data.xlsx?dl=0 George Washington was voiced by my friend Ben Moor. They are in The Queen's Gambit! The Voice of Alabama is voiced by The Voice of Alabama. They are in Alabama! Thanks to all of my Patreon supporters who mean I can spend a silly amount of time on a video like this. So much time. So much historical data. You too can help support me: https://www.patreon.com/standupmaths CORRECTIONS - I didn't bother showing me locking cell references in the animations. Things like "=B4/B2" should have been "=B4/$B$2" so I could drag the formula down. We took that out in the interest of clarity. - Yes, at 13:20 I say "the divisor ceases to lose some of its strict meaning" which is the opposite of what I meant! the sentence needs but the one negative. Either of these would work: "the divisor loses some of its strict meaning" OR "the divisor ceases to have some of its strict meaning". - Sorry, at 16:47 column D is wrong. These are different numbers using 880 but the values over in E use the correct 930. It's just a display issue and does not change the results (despite being a bit confusing!). Spotted by a few people including Thomas Klemm and AverageJon. - Let me know if you spot anything else. Filming and editing by Alex Genn-Bash Animations by William Marler http://wmad.co.uk/ Voice work by Ben Moor and Destin Sandlin. Yes, it was Destin. Well done on scrolling all the way down here to check. SUM Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Hep Cats by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 license. https://creativecommons.org/licenses/by/4.0/ Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1500022 Artist: http://incompetech.com/

If you're near Leeds, check out Maths City! https://mathscity.co.uk/ Against my better judgement, here is all the terrible python code I used to find the cosh curves. https://github.com/standupmaths/bubble-cosh The Goldschmid point is at 0.5276973967 The bubble bursts at 0.6627434193 The working out steps I skipped are on the MathWorld Minimal Surface of Revolution page. https://mathworld.wolfram.com/MinimalSurfaceofRevolution.html If you like some bikes with your gradients, check out Nico's 'Live To Ride' channel. https://www.youtube.com/user/NicoTurnerVideos And as you may have noticed, the laser video with Seb is not out yet. I think it's going to trail this one by quite a while. Thanks to all of my Patreon supporters funded this video. Normally I would just visit a maths museum and have a fun day out. But thanks to you all, I was able to hire a camera person to follow me around. Plus I did a day of prep-work writing code before my visit and a day of generating plots after the visit. That's thanks to Patreon. (Who am I kidding; I would have done the coding and plots anyway.) https://www.patreon.com/standupmaths CORRECTIONS - None yet: let me know if you spot any mistakes! Filming and editing by Nico Turner State-of-the-art computer simulations by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Listen to my podcast A Problem Squared! https://aproblemsquared.libsyn.com/ This is Bec Hill. https://www.youtube.com/channel/UC5_iLVNOt2i0fX57v8AjMEQ http://www.bechillcomedian.com/ Huge thanks to Sam Hartburn! Check out her posts on 'Rupert Polyhedra'. https://samhartburn.co.uk/sh/rupert-polyhedra-cube/ And here are her files on github: https://github.com/SamHartburn/RupertPolyhedra Prince Rupert's Cube on Mathworld. https://mathworld.wolfram.com/PrinceRupertsCube.html My previous Halloween videos: What is a Vampire Matrix? https://www.youtube.com/watch?v=9nogAYHmnNw How to make a fold-and-cut bat! https://www.youtube.com/watch?v=1K-uEwD0OTg Thanks to all of my Patreon supporters who mean I can waste a day wasting a pumpkin. You too can help support me: https://www.patreon.com/standupmaths CORRECTIONS - None yet: let me know if you spot any mistakes! Filming and editing by Matt Parker Opening titles by Alex Genn-Bash Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Join Team Seas! https://teamseas.org/ #teamseas Huge thanks to Richard Garriott de Cayeux and the whole team. https://richardgarriott.com/ Here is the raw data as a CSV or you can download my Excel spreadsheet. https://www.dropbox.com/s/6lvnqayp7k2ibr7/Flere_03Mar_1_2021.csv?dl=0 https://www.dropbox.com/s/b9s4lyb77giy83q/Flere_03Mar_1_2021_MATT.xlsx?dl=0 Video of me double-checking the units will be here shortly: https://www.patreon.com/standupmaths Behold the TRITON 36000/2 https://caladanoceanic.com/home/technology/sub/ "Revised depth of the Challenger Deep from submersible transects; including a general method for precise, pressure-derived depths in the ocean" https://www.sciencedirect.com/science/article/pii/S0967063721001813 All the Gibbs SeaWater Oceanographic Toolbox details you could ever want! https://www.teos-10.org/pubs/gsw/html/gsw_contents.html Thanks to all of my Patreon supporters funded the DSV Unrealistic. You too can help support me and be part of such cutting-edge fictitious research and development. https://www.patreon.com/standupmaths CORRECTIONS - At 14:13 I say the mass "of the submersible" when I should be talking about the mass of water above the submersible. -At 31:34 I say "grams" instead of "kilograms". Which takes some of the air out of my unit bashing. - Let me know if you spot any other mistakes! Filming and editing by Alex Genn-Bash Additional footage and photos thanks to Richard Garriott de Cayeux DSV Unrealistic by Jennie Vallis Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Find your own ABC triple: https://abc.tngtech.com Details about Jane Street + University of Oxford’s Black Academic Futures Scholarships: http://www.maths.ox.ac.uk/study-here/postgraduate-study/jane-street-graduate-scholarships Huge thanks to Sebastian Stamminger and Daniel Pape from TNG for all of their help. TNG: https://www.tngtech.com Big Techday: https://www.tngtech.com/tng-ueber-uns/bigtechday.html Here is James Grime talking ABC. https://youtu.be/RkBl7WKzzRw Manim “math animation” community version: https://www.manim.community Grant of 3blue1brown fame: https://youtube.com/c/3blue1brown This video was made possible by my Patreon supporters who this time only had to buy me some wooden blocks Lego. They also helped stress-test the ABC site before the video was released. You can also help support and shape the videos I make! https://www.patreon.com/standupmaths CORRECTIONS - Yes, the Big Techday was actually two weeks ago. We had unavoidable website issues so this video just had to wait patiently. - Let me know if you spot any other mistakes! Editing, filming and Lego gluing by Alex Genn-Bash Manim by Sebastian Stamminger Site coding by Daniel Pape Stop-motion by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Hannah’s book is out now! https://www.waterstones.com/book/rutherford-and-frys-complete-guide-to-absolutely-everything-abridged/adam-rutherford/hannah-fry/2928377065652 https://www.amazon.co.uk/dp/1787632636/ If you have a spare 2⅔ hours you can watch Matt hand craft a protractor. Yes, I know the audio is glitchy. https://youtu.be/rSox1RRbxXA More about Abu Arrayhan Muhammad ibn Ahmad al-Biruni: https://mathshistory.st-andrews.ac.uk/Biographies/Al-Biruni/ This video was made possible by my Patreon supporters for. Those cocktails were officially on you. https://www.patreon.com/standupmaths CORRECTIONS - None yet! Let me know if you spot any mistakes. Editing and filming by Trunkman Productions https://trunkman.co.uk Protractors by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

You must pre-order Maddie's new book. Several copies. For every young person you know. https://www.maddiemoate.com/book And cheers to Maddie for being my number one bee friend. She made a video on the same day which you should absolutely check out. Her whole channel is fab. https://youtu.be/gMa1y_vrmzM Huge thanks to Black Bee Honey for letting us annoy their bees. https://www.blackbeehoney.com/ And thanks to Vincent for talking to me about bees. http://chittkalab.sbcs.qmul.ac.uk/VinceGallo/VAG.html This video was made possible by my Patreon supporters for whom I will risk more than bees. You can also help support and shape the videos I make! https://www.patreon.com/standupmaths CORRECTIONS - None yet! Let me know if you spot any mistakes. Editing and filming while covered in bees by Alex Genn-Bash Additional filming and bee angering by Greg Foot Cardboard models by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

STEVE MOULD FACE REVEAL! Check out Steve's 10^6 subscriber Q+A with me cosplaying as Steve. https://www.youtube.com/watch?v=GLADzZJqEyI UPDATE: We have a proof that if a cable goes back and forth under a handle an equal number of times it can always be removed! Thanks to Henry Segerman. (It does assume the cord itself is not knotted.) https://www.dropbox.com/s/h8r1wk7qo1wwv71/Plug%20Handle%20Puzzle.pdf?dl=0 Huge thanks to Susan Okereke for helping out with the video. https://dothemathsthing.com/ Check out her podcast with Bobby Seagull: Maths Appeal https://youtube.com/channel/UCAScbgd_NlV99YSTK_pwfAQ https://m.soundcloud.com/mathsappeal This is the reddit post Steve mentioned. https://reddit.com/r/blackmagicfuckery/comments/kf65yo/dont_snip_use_sorcery/ Whitehead link https://mathworld.wolfram.com/WhiteheadLink.html Cheers to my Patreon supporters. Without them I could not have afforded Steve's exorbitant YouTube consultancy rates. https://www.patreon.com/standupmaths CORRECTIONS - I never make mistakes. Filming by Steve Mould, Alex Genn-Bash and Matt Parker Editing by by Alex Genn-Bash Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out https://www.kiwico.com/standupmaths and get 50% off your first month of any crate! Maybe enjoy making a pencil sharpener! Not that I'd know what that's like... This is the GeoGebra file Sam Hartburn made for me: https://www.geogebra.org/m/pffgbck8 Here is The Coding Train's first part of the Super Shape series. https://www.youtube.com/watch?v=z86cx2A4_3E I mentioned the these old videos of mine: Ellipses and perimeters https://www.youtube.com/watch?v=5nW3nJhBHL0 Generalising fibonacci https://www.youtube.com/watch?v=ghxQA3vvhsk Lemniscate on MathWorld https://mathworld.wolfram.com/Lemniscate.html This is a really good write-up about Gauss and the Arithmetic-Geometric Mean. https://homepage.univie.ac.at/tomack.gilmore/papers/Agm.pdf This is a nice related problem about the area v perimeter of a squircle. https://www.johndcook.com/blog/2019/04/11/dido-problem/ Cheers to my Patreon supporters for whom I have dedicated one digit of Gauss's constant each. It was their inspiration who made me do the 'multiple Matts' thing. You can also help support and shape the videos I make! https://www.patreon.com/standupmaths CORRECTIONS - If you feel a sense of déjà vu: yes, the two sections at 16:13 and 16:45 cover the same content. I tried saying it two different ways and we accidentally left both in the edit. So, let's call that 'buy one get one free' sale on learning. - At 21:42 I say "geometric mean" instead of "arithmetic mean". And that is probably not the only time. These words have lost all meaning to me. - The Patreon credits stop early! Long story. I'll explain on Patreon. - Let me know if you spot any other mistakes. Crazy amount of editing and meshing of footage by Alex Genn-Bash Maths graphics by Sam Hartburn and Matt Parker Kitchen by Carrie and Nina Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get Private Internet Access for 2.08 $/month: https://privateinternetaccess.com/standupmaths (That's cheaper than what I'm paying!) Here are my files with all the distances and angles on a keyboard. http://pi-ratebay.com/files/all_keyboard_distances.txt http://pi-ratebay.com/files/all_keyboard_angles.txt If you want the original coordinates of all keys, I'm pretty sure you can find that on http://pi-ratebay.com/ Thanks to everyone who made those ridiculous Mathematics He Wrote opening titles possible. The folder was crafted by Lisa Mathers, the SUM theme was one again remixed by Howard Carter and the whole thing was directed by Alex Genn-Bash. I did all my own typing. For my word list I used "words_alpha.txt" from here: https://github.com/dwyl/english-words Here is Sam Hartburn's cross product Geogebra file: https://www.geogebra.org/m/ez7sqwxw If you like word fun, you should check out Word Ways. All the editions are available free online. Here is the one I showed: https://digitalcommons.butler.edu/wordways/vol32/iss4/13/ The tshirt I'm wearing is 'Focal Point' which has sadly been discontinued by Ugmonk: https://ugmonk.com/products/focal-point Thanks to all my Patreon supporters who help make these videos possible. If you can't find your name in the credits, I'll be handing out distances over here: https://www.patreon.com/posts/55048738 CORRECTIONS: - Urg, at 05:46 Pythagoras is accidentally spelled as “Pythagorus”. That’s not a joke; legit mistake. I’ve made a real uss of myself. - At 09:57 I say PAPAL averages 13.1cm "per journey" when I should have said "per letter". Consider this my confession. - Let me know if you spot any other mistakes! And here are most of the words mentioned in this video: MINIMUM (distance = 248.0mm, angle = 77.4°) DICHLORODIPHENYLTRICHLOROETHANE (distance = 2119.5mm, angle = 1548.0°) ANTIDISESTABLISHMENTARIANISM (distance = 2031.8mm, angle = 1229.3°) SUPERINCOMPREHENSIBLENESS (distance = 1665.5mm, angle = 1090.4°) PALAPALA (distance = 1112.9mm, angle = 19.6°) PAPAL (distance = 655.7mm, angle = 6.5°) PAPA (distance = 503.3mm, angle = 0.0°) AS (distance = 19.1mm, angle = 0.0°) ASS (distance = 19.1mm, angle = 0.0°) POO (distance = 19.1mm, angle = 0.0°) POOP (distance = 38.1mm, angle = 0.0°) DEESS (distance = 43.4mm, angle = 50.9°) WEEDS (distance = 57.7mm, angle = 180.0°) WEEWEE (distance = 57.2mm, angle = 0.0°) WEEWEED (distance = 76.8mm, angle = 104.0°) DISMANTLEMENT (distance = 1124.2mm, angle = 143.3°) SPA (distance = 316.6mm, angle = 0.8°) FUZZ (distance = 162.8mm, angle = 0.9°) GAZOGENE (distance = 523.5mm, angle = 310.3°) SCHIZOGONY (distance = 638.2mm, angle = 407.0°) WAYZGOOSE (distance = 502.8mm, angle = 294.0°) OUTREACH (distance = 255.3mm, angle = 878.2°) ETHMOIDS (distance = 278.4mm, angle = 798.9°) NONMISCHIEVOUSNESS (distance = 965.9mm, angle = 1068.5°) NONSUBSTITUTIONARY (distance = 989.4mm, angle = 1038.4°) Filming and editing by Alex Genn-Bash Props by Lisa Mathers Geogebra by Sam Hartburn Music by Howard Carter Design by Simon Wright and Adam Robinson All typing by Matt Parker MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out the Jane Street podcast: Signals and Threads. My goodness it's nerdy. I love it. https://signalsandthreads.com/ You can watch the original live-stream of the trick here. I actually did it twice! Yeah, now you're convinced, you sceptical bunch you. https://youtu.be/hlsN32dBCHQ Here is my previous video about perfect bridge deals. https://www.youtube.com/watch?v=s9-b-QJZdVA 52-Card Perfect Shuffles on Numberphile. https://www.youtube.com/watch?v=Y2lXsxmBx7E The Solutions to Elmsley’s Problem by Persi Diaconis & Ron Graham. https://statweb.stanford.edu/~cgates/PERSI/papers/pre-elmsley.pdf Thanks to Cameron Zach for being the first to send me a valid new solution to Elmsley’s Problem. Here is their code: https://www.dropbox.com/s/na4t1j0ksajaapa/shortest_shuffles.py?dl=0 Maths on the Back of an Envelope by Rob Eastaway. https://mathsgear.co.uk/products/signed-copy-of-maths-on-the-back-of-an-envelope All the fancy animations are done by William Marler. To see more: check out their Learn With Will channel. https://www.youtube.com/channel/UCJg0GwRpaD9W8W9RYB0KeVQ/featured Thanks to all of my Patreon supporters who made up much of the live audience for the trick. You too can help support me and get advanced warning of other such things! https://www.patreon.com/standupmaths CORRECTIONS - None yet: let me know if you spot any mistakes! Filming and editing by Alex Genn-Bash Amazing animations by Willian Marler Other adequate graphics by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thank you to BetterHelp for sponsoring this video! To get 10% off your first month of therapy, go to https://betterhelp.com/standupmaths to sign up today. If you are need of urgent mental health support please check for crisis help lines available in your country. USA: https://www.mentalhealth.gov/get-help/immediate-help UK: https://www.nhs.uk/mental-health/advice-for-life-situations-and-events/where-to-get-urgent-help-for-mental-health/ Do check out Jordan Ellenberg's book Shape. This video was inspired by Chapter 2. https://www.nytimes.com/2021/06/21/books/review/jordan-ellenberg-shape.html https://www.jordanellenberg.com/book/shape/ Support me on Patreon and I will post you a free torus balloon. I hope I don't regret this. https://www.patreon.com/standupmaths Here is Sam Hartburn's geogebra file: https://www.geogebra.org/m/yjtjxr2n Trouser animations thanks to: Bentley Davis https://BentleyDavis.com Em Raymond https://twitter.com/techcavy Kalina Panteleeva https://www.instagram.com/kalinadoescg/?hl=en Thanks to Visual Topology & Geometry for "Punctured torus homeomorphism". https://www.youtube.com/watch?v=tz3QWrfPQj4 Me cutting two joined cylinders in half way back in 2015. Good times. (At 29:29.) https://youtu.be/1wAaI_6b9JE?t=1769 CORRECTIONS: - When talking about the Euler Characteristic of the torus at 16:29 I say the value of zero is "only on our friend the torus" which is technically wrong. In the moment I was just talking about the sphere and the torus but loads of other shapes have an Euler Characteristic of zero. Like the cylinder. - I'm undecided if the string method of thinking about holes at 17:04 was helpful. I could have talked about the dimension of the boundary manifold, but that felt like I was repeating the previous bit too much and wanted a different way to think about it. Not sure if this counts as a 'correction' per se, but I just needed to talk to someone about it. Thanks for listening. - Let me know if you spot any other mistakes! Filming and trouser sewing by Alex Genn-Bash Editing by Michelle Martin Graphics by Sam Hartburn Doughnuts later eaten by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Consecutive primes which are widely digitally delicate. https://people.math.sc.edu/filaseta/ConsecutiveDigitallyDelicatePrimes2021.pdf Data from the paper: https://people.math.sc.edu/filaseta/ConsecutiveWDDPrimes.html Here is the bonus footage. https://youtu.be/wtzgbJuHSfM And yes, the theme song (along with the remix) is on Bandcamp as 'pay what you want'. So you can download for free, or pay something to help support the channel. https://standupmaths.bandcamp.com/track/digits-are-forever-inc-prime-remix More than ever, thank you to my Patreon supporters for making this video possible. It is also their fault that the next SUM-007 will be called "The Spy Who Loved e". They got to vote on ten pun titles and "The Spy Who Loved e" beat second-place "No Time to π" 239 votes to 226. https://www.patreon.com/posts/53485855 Help support and shape the videos I make! https://www.patreon.com/standupmaths CORRECTIONS - At 00:33 there is a "33" which should be "53". Mistake first spotted by Andrew Foong but I'm going to claim it's some hidden message about the number 33. - I say k is a "positive integer" a bunch when it should be "non-negative integer" to include zero. Like at 06:30, 08:48 and 14:35 (thanks Martijn Oostrom!). The formal statement on-screen at 17:15 is the official correct version showing that n is positive but k is non-negative. - Robin Houston noticed that the on-screen text at 4:19 says Erdös instead of Erdős. Excuse me while I delete the whole channel. - Let me know if you spot any more mistakes! As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Music by Howard Carter Lyrics and vocals by Helen Arney Animations by William Marler Filming and editing by Matt Parker Maths graphics by Sam Hartburn and Matt Parker Colour grading by Alex Genn-Bash Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out Katie's video about The Unwanted Shape. https://www.youtube.com/watch?v=wN9f-k9oRts Instruction to make the rhombicuboctahedron: - Maths - That's it. (If it helps, I made the squares with a side length of 62mm and the triangles 102mm.) Huge thanks to my Patreon supporters who mean I can drop what I'm doing and spend two days writing/filming/editing such a ridiculous video just because I noticed a correlation involving triangles. https://patreon.com/standupmaths I showed bits from these two old videos: All UK football road signs are wrong! Join the petition for geometric change! https://www.youtube.com/watch?v=btPqKAGyajM Geometry of Footballs and the Cube-shaped Ball https://www.youtube.com/watch?v=cwWBpjeyRS0 Flat vs inflated ball image from here: https://commons.wikimedia.org/wiki/File:Comparison_of_truncated_icosahedron_and_soccer_ball.png The classic Platonic and Archimedean Solids animations all from wikipedia. https://en.wikipedia.org/wiki/Platonic_solid https://en.wikipedia.org/wiki/Archimedean_solid This is the pixel-efficient cube-to-octahedron animation:https://commons.wikimedia.org/wiki/File:P2-A5-P3.gif Big thanks to the roughly one million screaming children who were at some far side of the park I was filming in, but somehow still made their voices heard. CORRECTIONS - I should have mentioned that the England women's football team reached the Euro finals in 1984 and 2009. - Let me know if you spot any mistakes! Filming by Matt Parker Editing by Matt Parker Models by Matt Parker Graphics by Matt Parker (also, wikipedia) Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Get to know Jane Street! https://www.janestreet.com/join-jane-street/get-to-know-us/ Which hypercube unfoldings tile space? https://whuts.org/ Yes, you can buy one of the 261 models from this video and support the channel. All hand-numbered by me and with a signed certificate of authenticity. https://mathsgear.co.uk/products/cube-model Here is Giovanna Diaz and Joseph O’Rourke's paper: https://arxiv.org/abs/1512.02086 A091159 Number of distinct nets for the n-hypercube. https://oeis.org/A091159 The code Moritz used to find these values is here: https://github.com/google-research/google-research/tree/master/cube_unfoldings All of Moritz Firsching's 3D models: https://mo271.github.io/mo/198722/unfoldings.html Their post on the number of unfoldings in higher dimensions. https://mathoverflow.net/questions/300713/number-of-hypercube-unfoldings This is the Math Overflow post which started it all: https://mathoverflow.net/questions/300713/number-of-hypercube-unfoldings Peter Turney's 1984 paper Unfolding the Tesseract https://unfolding.apperceptual.com/ The cubes I am using are called "mathlink" and I just bought a huge quantity from Amazon (because Learning Resources didn't answer my emails). US: https://amzn.to/3bsWOZd UK: https://amzn.to/3offAsr The unfolding animation of the 'Dali cross' was kindly made by my Patreon supporter John Sawyer. I actually put the rough-cut of this video out on Patreon earlier this week so they could provide feedback and help test the whuts.org site. Thanks so much for all of your help everyone! https://www.patreon.com/posts/51144440 CORRECTIONS: - I saw "288" at the end of the 8D number when it should be "228". The on-screen number is correct. I noticed too late to fix it! - At 21:09 I say Diaz and O’Rourke found an unfolding of the Dali cross which tiles the plane. It’s actually a different 3D net they found which does this and the Dali is undetermined if it produces a tiling 2D net. (Thanks Dan L by email.) - Let me know if you spot any more mistakes! Filming and editing by Alex Genn-Bash Maths graphics by Matt Parker Music by Howard Carter The song Hep Cats by Kevin MacLeod is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/ Source: http://incompetech.com/music/royalty-free/index.html?isrc=USUAN1500022 Artist: http://incompetech.com/ Yeah, I decided to replace the copyright-claimed Aerosmith. Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out https://www.kiwico.com/standupmaths and get 50% off your first month of any subscription! Subscribe to Steve Mould’s channel. I sent him the next video challenge along with the Monomatch cards. http://youtube.com/stevemould Support me on Patreon and get sent three "Monomatch Myriad" cards to check. https://www.patreon.com/posts/50645477/ Here is the bonus 'behind the cards' video on how I made Monomatch Myriad. https://youtu.be/_l6h8v6R7yo It occurs to me it would be foolish to not provide Amazon referral links but don’t forget about your local independent toy retailers! USA SPOT IT: https://www.amazon.com/s?k=spot+it&ref=nb_sb_noss?_encoding=UTF8&tag=stanupmath-20 UK DOBBLE: https://www.amazon.co.uk/s?k=dobble&ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 This is the student video I mentioned: "How to make the card game Dobble (and the Maths behind it!)" https://www.youtube.com/watch?v=oyqD1Sg5M4Q Double Dobble https://aperiodical.com/2020/05/the-big-lock-down-math-off-match-22/ Droste Dobble http://christianp.github.io/droste-dobble/ https://mathsjam.com/assets/talks/2015/ChristianPerfect-DrosteDobble/#/ "A finite projective plane exists when the order n is a power of a prime." https://mathworld.wolfram.com/ProjectivePlane.html Finite projective plane of order 4 image from here: https://demonstrations.wolfram.com/ProjectivePlanesOfLowOrder/ Catch the match! https://boardgamegeek.com/boardgame/1321/catch-match/credits The American Mathematical Monthly Vol. 13, No. 11, Nov., 1906 https://www.jstor.org/stable/i349244 Vol. 14, No. 5, May, 1907 https://www.jstor.org/stable/i349250 CORRECTIONS - At 06:35 Dimitri Provoost spotted that some of the star and cross symbols on the diagonal red lines are accidentally swapped around. Good spot Dimitri! - I think once or twice I say "card" when I mean "symbol". I blame too much time spent with projective planes. - Let me know if you spot any other mistakes! Thanks to my Patreon supporters who keep me well-stocked with children's card games. And now 101 pentagons all featuring a happy little house. https://www.patreon.com/standupmaths Filming and grading by Alex Genn-Bash Editing by Matt Parker Graphics by Sam Hartburn and Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Signup for your FREE trial to The Great Courses Plus here: http://ow.ly/I5fV30rDCPO This was my previous video about Dream and Minecraft. "How lucky is too lucky?: The Minecraft Speedrunning Dream Controversy Explained" https://www.youtube.com/watch?v=8Ko3TdPy0TU Yep, I did try to do 52 perfect shuffles in a row, live. With, I would say, some success. This is the Patreon post with details: https://www.patreon.com/posts/50353681 You can now watch it here: https://youtu.be/mx5vJkRI9VY Check out Tori Noquez's great videos. "The Mathematics of 8 Perfect Faro Shuffles" https://www.youtube.com/watch?v=MtBzp_-h0oQ This is Peter Rowlett's Aperiodical article "Four perfect hands: An event never seen before (right?)" https://aperiodical.com/2011/12/four-perfect-hands-an-event-never-seen-before-right/ Plus Jason Davison did a Numberphile about perfect shuffles and magic. https://www.youtube.com/watch?v=Y2lXsxmBx7E This is how I actually did the calculation. https://www.wolframalpha.com/input/?i=%2812%21%5E4+39+26+13%29%2F51%21 CORRECTIONS - The first upload of this video had some serious audio issues. Sorry! It broke when the video was render and because it was only in the middle I didn't spot it once it had uploaded. - At 07:45 I imply that you might start dealing from the bottom of the deck (obviously I would never dream of such a thing). But the structure is the same as dealing from the top. It was just easier to see from the 'bottom' of the face-up cards. - 14:01I am inconsistent with "second card in" and "first card in". In both cases I mean the second card along. Which is the first card 'in'. - Let me know if you spot any mistakes in this version! Thanks to my Patreon supporters who I used to justify spending several weeks learning how to do a faro shuffle. I'm meant to be writing a new book you know. So, thanks a lot. https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Genn-Bash Graphics by Sam Hartburn and Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Sign-up for Private Internet Access and we can be VPN buddies! Under $3 a month. https://www.privateinternetaccess.com/standupmaths Thanks to Kerry D. Wong who originally piqued my interest by sending me this: http://www.kerrywong.com/2009/09/06/an-alternative-illustration-of-prime-number-distribution/ Here are the papers about finding arbitrarily large gaps between primes: The first paper: https://arxiv.org/abs/1408.4505​ The paper one day later: https://arxiv.org/abs/1408.5110 Watch the author of the second paper James Maynard talk about it on Numberphile: https://www.youtube.com/watch?v=BH1GMGDYndo&ab_channel=Numberphile The 'top dots' are called "Jumping Champions" and you can read more about them being primorials here: https://mathworld.wolfram.com/JumpingChampion.html Here is loads about prime gaps with references if you want to see the original papers. http://sweet.ua.pt/tos/gaps.html That link was sent to me by my Patreon supporter Bruce Garner (who has also calculated the first trillion prime gaps using C++). That page is excellent; I wish I'd found it before I started writing the video. CORRECTIONS: - At 08:07 they should have been p_(n+1) - p_n ≥ 8. Or I guess p_n - p_(n-1) ≥ 8. But not what I put. What I put was wrong. - Wow. At 15:33 I said "big zero" instead of "big O". I'm so adamant that I say "zero" instead of "oh" for the digit that I finally had a subconscious false-positive! UPDATE: I actually spotted this one right before release and it looks like responses were pretty split on if I should have fixed that. I didn't. https://twitter.com/standupmaths/status/1379438185374171137 - At 23:43 I mentioned your ISP knowing what you are searching for but I forgot that https means the rest of the URL is hidden from your ISP. So they would only know you have visited google, but not see anything after the "?" in "https://www.google.com/search?q=giant+chalkboards+covered+in+maths". I should have used a website as the example. I'll do that next time. - Let me know if you spot any mistakes. Thanks to my Patreons who are vital in keeping the videos coming. Future Matt has a very expensive rider. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming editing by Alex Genn-Bash Graphics by James Arthur and Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out Steve Mould's Pythagorean Siphon video: https://www.youtube.com/watch?v=Cg8KQfaT9xY&ab_channel=SteveMould Every Pi Day I calculate the digits of π somehow. This year I counted the number of molecules in a disc as a 'real accurate' way to measure its surface area. You can see all the previous videos here: https://www.youtube.com/watch?v=CKl1B8y4qXw&list=PLhtC92GarkjyYbxI3-4qzIWIRbZaw4wuP Yes, you can buy the sheets of paper I wrote on in this video. I've signed them and all money goes to WaterAid UK. https://www.ebay.co.uk/usr/standupmaths Here is the calculation (keeping mL and cm units throughout). Our 7 drops were 0.1 mL of solution which is 0.00005 concentration. Oleic acid is 282.47 g/mol and 0.895 g/mL. Using Avogadro's number of 6.02214 × 10^23 that is 9.54 × 10^15 molecules of oleic acid. That is a volume of 5.24081 × 10^-22 mL per molecule. Which is a length of 8.06243 × 10^-8 cm and area of 6.50028 × 10^-15 cm^2. Total area of 62.016 cm^2. The disc of molecules had a radius of 4.000 cm and so that gives us π = 3.876 (I lost 0.001 because I was rounding as I went). CORRECTIONS: - No, I didn’t publish early by accident! I try to put π-Day videos out a bit early so teachers have time to use in lessons before/on π Day. - I’m hearing reports that oleic acid is not an oil, the carboxylate end makes it a surfactant (first mentioned Ian Roberts). I blame any and all chemistry mistakes on Steve. - Let me know if you spot any other mistakes! Thanks to my Patreons who are vital in keeping the videos coming. Steve has a very expensive rider. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming by Matt Parker and Steve Mould Editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out the Jane Street programs if you're considering a mathematics/finance/programming job: https://www.janestreet.com/join-jane-street/our-programs/ Here is Tim Gowers's reply to the original tweet: https://twitter.com/wtgowers/status/1346212151581700096 Start your Schanuel's Conjecture journey here: https://mathworld.wolfram.com/SchanuelsConjecture.html 3^3^3^3 on wolfram alpha: https://www.wolframalpha.com/input/?i=3%5E3%5E3%5E3 And for completeness, here is pi^pi^pi^pi: https://www.wolframalpha.com/input/?i=pi%5Epi%5Epi%5Epi If you have opinions about my 2n conjecture, send an email to [email protected] Here is my Numberphile video about types of numbers. https://www.youtube.com/watch?v=5TkIe60y2GI CORRECTIONS: - None yet, let me know if you spot any mistakes! Thanks to my Patreons who are also vital in keeping the videos coming. Stock audience clips don't come cheap. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Editing by Alex Genn-Bash Maths graphics by Sam Hartburn and Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Buy my book Humble Pi now! https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UPDATE: Harvard Book Store have totally sold out. My talk on 4 February 2021 at Harvard Book Store: https://www.harvard.com/event/virtual_event_matt_parker/ Here is the original accusation against Dream. Video: https://www.youtube.com/watch?v=-MYw9LcLCb4&ab_channel=Geosquare Paper: https://mcspeedrun.com/dream.pdf And here is Dream's reply. Video: https://www.youtube.com/watch?v=1iqpSrNVjYQ&ab_channel=DreamXD Paper: https://drive.google.com/file/d/1yfLURFdDhMfrvI2cFMdYM8f_M_IRoAlM/view "Matt flips a coin 100 times." https://youtu.be/T2Xtit17snE "Holy Craps! How a Gambling Grandma Broke the Record" http://content.time.com/time/nation/article/0,8599,1901663,00.html Number of casinos in the world in 2011: 3,547 https://www.statista.com/statistics/221031/total-worldwide-casinos-by-region/ Roulette records. https://www.roulette17.com/stories/record-reds-blacks-in-a-row/ CORRECTIONS - At 09:08 I say “1 in 110 trillion” when I meant to say “1 in 110 billion”. The number on the screen is correct, it was just a verbal slip-up. - At 25:27 I showed the 118 craps record as “1 in 1.2 × 10^9” when it should be “1 in 2.2 × 10^9”. The voiceover says the correct number. - I slip and “more likely” instead of “less likely” at 33:47 (I think I may have even been going for “more unlikely”). But everything in the screen is correct. - Let me know if you spot any more mistakes! Thanks to my Patreon supporters who mean I can spend [[REDACTED]] hours filming myself trying to achieve improbably things. If you support me, you can get access to all [[REDACTED]] hours of bonus footage from this episode. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. And I believe they have no opinion on Dream. https://www.janestreet.com/ Endless filming by Matt Parker Editing by Alex Genn-Bash Some graphics by Ben Sparks Minecraft consultancy by Oliver Dunk Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

If you support me on Patreon at any point in December 2020 I will film your name on my xmas tree while I give you a thumbs-up of appreciation. https://www.patreon.com/standupmaths Huge thanks to Eugénie von Tunzelmann for helping me out with this video. You can see more of Eugénie in my "General Relativity: Top 05 Mishaps [inc INTERSTELLAR]" video. https://www.youtube.com/watch?v=Z4oy6mnkyW4 Thanks to Ben Sparks for helping out with the GeoGebra file. You can try an online version here: https://www.geogebra.org/m/p2pdz6v2 And of course thanks to Howard Carter for yet one more remix of the Stand-up Maths theme song. The main theme is on bandcamp: https://standupmaths.bandcamp.com/ If there is enough demand we'll make a Christmas album. Here is my code on github (along with the 3D coordinates of all 500 LEDs on my tree). If you have a program you would like to see run on my tree, email me [email protected] https://github.com/standupmaths/xmastree2020 My prototype LEDs were type WS2801 and wired to as Raspberry Pi Zero. The WS2801 LEDs I used on Amazon. Other retailers are available. https://www.amazon.co.uk/dp/B01MDJ3VBC/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 I set-up the Pi to run 'headless' (no monitor or keyboard) largely using this guide: https://www.tomshardware.com/uk/reviews/raspberry-pi-headless-setup-how-to,6028.html I followed this guide to wire and program the WS2801 LEDs. If you use an off-the-shelf power supply you do not need to worry about the mains wiring (which you should not do unless you are qualified). https://tutorials-raspberrypi.com/how-to-control-a-raspberry-pi-ws2801-rgb-led-strip/ Then I switched the WS2811 LEDs because I could buy 500 of them (they are also cheaper). I also switched to a Raspberry Pi 3 because my Pi Zero didn't have wifi. The WS2811 LEDs I used on Amazon. Other retailers are available. https://www.amazon.co.uk/dp/B0775CC559//ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 https://www.amazon.com/ALITOVE-Individually-Addressable-Advertising-Waterproof/dp/B0775CC559?_encoding=UTF8&tag=stanupmath-20 I wired up the WS2811 LEDs and coded them using this guide. https://learn.adafruit.com/neopixels-on-raspberry-pi/raspberry-pi-wiring CORRECTIONS: - None yet. Let me know if you spot anything! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who funded those LEDs. If this video does well, I'll buy even more next year. https://www.patreon.com/standupmaths Filming and editing by Alex Genn-Bash and Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

This is Part III out of 'one with a quadrillion zeros' parts. Give the gift of Stand-up Maths this Christmas: https://www.patreon.com/standupmaths https://mathsgear.co.uk/ Part I: "Why do Biden's votes not follow Benford's Law?" https://www.youtube.com/watch?v=etx0k1nLn78 Part II: "Do these scatter plots reveal fraudulent vote-switching in Michigan?" https://www.youtube.com/watch?v=aokNwKx7gM8 Here is the Supreme Court filing from the State of Texas: https://www.supremecourt.gov/DocketPDF/22/22O155/162953/20201207234611533_TX-v-State-Motion-2020-12-07%20FINAL.pdf Declaration of Charles J. Cicchetti, Ph.D. is in the appendix of this document, starting on page 20. https://www.supremecourt.gov/DocketPDF/22/22O155/163048/20201208132827887_TX-v-State-ExpedMot%202020-12-07%20FINAL.pdf Behold my declaration. https://www.dropbox.com/s/337h06gx5t6tjte/Declaration%20of%20Matthew%20T.%20Parker%2C%20B.Sc.%20Dip.%20Ed.%20%282020%29.pdf?dl=0 Here is the spreadsheet where I checked the combinations of states won by Democrats. https://www.dropbox.com/s/d1sat2bjb1ts9n3/combinations-of-states-won.xlsx?dl=0 CORRECTIONS - At 01:51 I accidentally said “Senate” when I meant “Congress”. But on-screen it says “House Republicans” so I think it still makes sense despite my mis-speak. - Let me know if you spot any more mistakes! Thanks to my Patreons who mean I can keep throwing time and effort at videos about this election. And don't worry, I am a prudent spender of your money: that judge's robe was hired not purchased outright. But I do now own the wig. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Thanks to Waterstones for choosing Humble Pi as a 'top 100' paperback of the year. https://www.waterstones.com/book/humble-pi/matt-parker/9780141989143 Signed copies are available at Maths Gear. It's cheaper at Waterstones, but not signed. You choose! https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback Thanks to Robert Englund and the Free University of Berlin for producing Archaic Bookkeeping. What a niche but amazing book. But be warned: copies are not cheap. https://www.amazon.co.uk/Archaic-Bookkeeping-Techniques-Economic-Administration/dp/0226586596 https://books.google.co.uk/books/about/Archaic_Bookkeeping.html?id=YBAzXV4YtQ8C&redir_esc=y Hey look, Kushim has their own wikipedia page! https://en.wikipedia.org/wiki/Kushim_(Uruk_Period%29 CORRECTIONS - None spotted yet. Let me know if you locate any mistakes. Thanks to Penguin Random House for supporting this video. As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ And thanks to all my Patreon legends. You allow me to take risks and make different videos like this. Will the internet like an all-animated Stand-up Maths video? We'll find out! https://www.patreon.com/standupmaths Animation by William Marler Music and sound by Howard Carter (including the SUM-erian theme remix) Written and narrated by Matt Parker Beer by Kushim and Nisa MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Check out the Maths Inspiration shows here: http://mathsinspiration.com/ 24 Nov: Visualizing Math(s) 04 Dec: Christmas Special You should definitely watch Destin's SmarterEveryDay video: Why Snatch Blocks are AWESOME (How Pulleys Work) https://www.youtube.com/watch?v=M2w3NZzPwOM Thanks to Hugh for actually weighing the bananas. http://www2.eng.cam.ac.uk/~hemh1/ The puzzle is a creation of Rob Eastaway. https://robeastaway.com/ Support me on Patreon and I swear I'll not waste the money on a banana costume. I'll totally use the money to make more, serious maths videos. https://www.patreon.com/standupmaths You also get to watch me eat a banana. While dressed as a banana. https://www.patreon.com/posts/44219338 CORRECTIONS - None yet. Let me know if you spot any mistakes. As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming by Matt Parker Editing by Alex Genn-Bash Diagrams by Jennie Vallis Music by Howard Carter Design by Simon Wright and Adam Robinson The Banana Who Feels: himself MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/ Fine. Here it is. Hugh's video. https://youtu.be/xseWHNVTqdY And the actual problem sheet from Hugh. https://www.dropbox.com/s/f60srd6qny8jrbv/pulleys_2020.pdf?dl=0

Here is the Dr Shiva Ayyadurai video I am talking about: https://www.youtube.com/watch?v=Ztu5Y5obWPk This is my previous video on Benford's Law: https://www.youtube.com/watch?v=etx0k1nLn78 Support me on Patreon and I'll make more maths videos. Probably not on election data, mind you. (Please, for the love of plot, no more election data.) https://www.patreon.com/standupmaths The page of working-out from this video is on eBay with all money going to the charity WaterAid. https://www.ebay.co.uk/itm/363180157841 This is where the Kent County data comes from: https://electionreporting.com/county/db3f9865-656b-4704-9429-bd38e726ab42 Here is the spreadsheet I show in the video with my plots: https://www.dropbox.com/s/7gusbewresl6zsg/Kent%20County%20Precinct%20Data%20from%20Stand-up%20Maths%20video.xlsx?dl=0 Dr Shiva's video title is "Dr.SHIVA LIVE: MIT PhD Analysis of Michigan Votes Reveals Unfortunate Truth of U.S. Voting Systems." but the presentation within the video is called "Mathematics Analysis of Trump-Biden 2020 Election Vote Counts in Four Counties in the State of Michigan". And finally, I know I didn't mention it in the video but Humble Pi is still cheap at Waterstones and signed at Maths Gear: https://www.waterstones.com/book/humble-pi/matt-parker/9780141989143 https://mathsgear.co.uk/products/humble-pi-signed-paperback CORRECTIONS - At 00:32 do I say "date" here instead of "data"? I think I do. I meant "data". - In hindsight I should have said one more "subtract the percentage of people who voted by party who voted Republican" at about 06:12. But my diagram points at the right bit so it should be clear. - Let me know if you spot any more mistakes! Thanks to my Patreon supporters who mean I can spend ANOTHER TWO DAYS trawling through election stats and making EVEN MORE plots. These videos had better be making a difference. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

My book is cheap at Waterstones and signed at Maths Gear: https://www.waterstones.com/book/humble-pi/matt-parker/9780141989143 https://mathsgear.co.uk/products/humble-pi-signed-paperback Check out Steve Mould's Numberphile video about Benford's Law. https://www.youtube.com/watch?v=XXjlR2OK1kM Buy a signed copy of "How Many Socks Make a Pair?" by Rob Eastaway. https://mathsgear.co.uk/products/copy-of-signed-copy-of-why-do-busses-come-in-threes There’s more on Mark Nigrini’s work here: http://www.nigrini.com/benfords-law/ "Benford's Law and the Detection of Election Fraud" 2011 paper. https://www.cambridge.org/core/journals/political-analysis/article/benfords-law-and-the-detection-of-election-fraud/3B1D64E822371C461AF3C61CE91AAF6D And for balance, here is a paper critical of that other paper (but only in the use of a 'second digit' check and they do not dispute the main Benford's Law claims.). https://pdfs.semanticscholar.org/e667/b8ad9f58992828ff820ddc8a005de754c5f5.pdf And here is a paper by the same author specifically about the 2020 US election results: http://www-personal.umich.edu/~wmebane/inapB.pdf Get your Chicago Board of Election Commissioners data here! https://chicagoelections.gov/en/election-results.asp?election=251&race=11 Yep, 2069 precincts. Some would say that's too many. https://data.cityofchicago.org/Facilities-Geographic-Boundaries/Precincts-current-/uvpq-qeeq If you must, here are links to people using Benford's Law to suggest the Biden votes were fraudulent. Please do no harass or brigade anyone. https://github.com/cjph8914/2020_benfords/blob/main/Chicago_Wards_Precincts_Benfords_Data.ipynb https://jonsnewplace.wordpress.com/2020/11/07/joe-bidens-votes-violate-benfords-law-mathematics-gnews/ CORRECTIONS - Hello loyal viewer. If you are reading this you most likely regularly watch my videos and know that I put corrections here. But the comment section on this video has been, to put it lightly, "wild". I don't think anyone is checking the corrections here! So I'm going to break with tradition and put the corrections in a pinned comment. But in short: - I should have said I used the Chicago data (instead of a swing state, let's say) because that is what people claiming election fraud were using. I didn't pick it myself to make a point. - Foolishly I cut a bit of the video where I talk about how Trump's data is also a bad Benford fit but that massive spike of 1s makes it look like a good match. Check out how low 3, 4 and 5 are. - There has been specific criticism of aspects of that paper I read from, but only the usual back-and-forth of academics. Everyone agrees with the idea that Benford is not a magic tool to detect election fraud (nor is any statistical tool really; they all require careful interpretation). - As always, let me know if you spot any other mistakes. Thanks to my Patreon supporters who mean I can spend TWO DAYS trawling through election stats and making plots. I'm meant to be writing a new book you know. So, thanks a lot. https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Apply for a paid internship at Jane Street! Or, a job. https://www.janestreet.com/join-jane-street/info-booth/ Vampire Numbers on Numberphile with James Grime. https://youtu.be/3ZMnVd4ivKQ Flammable Math's original tweet: https://twitter.com/FlammableMaths/status/1306303462607654914 Robin Houston gets involved: https://twitter.com/robinhouston/status/1306539901576503297 Here comes Greg Egan! https://twitter.com/gregeganSF/status/1306565923671736320 Robin's tweets about characteristic polynomials and the Cayley-Hamilton theorem. I suggested looking them up and working through the logic yourself. It's straight-forward enough and good fun. https://twitter.com/robinhouston/status/1306588415001915393 Robin's code for finding 2 × 2 examples: https://gist.github.com/robinhouston/83f0fa99046aeaaf5d27ddbb3218142e Robin's 3 × 3 monsters. If you can beat them: let us know! https://gist.github.com/robinhouston/6c74a607a7ee8d4553feead2828107d9 My previous video about log(1+2+3) https://www.youtube.com/watch?v=OcTMBrUutfk Behold the pi matrix which squares to give more pi! [[15,143],[52,936]] https://www.wolframalpha.com/input/?i=%5B%5B15%2C143%5D%2C%5B52%2C936%5D%5D%5E2 CORRECTIONS - At 07:20 I say 81 when I mean 82. The on-screen number is correct. - I accidentally say "log troll" instead of "division troll" at 03:38. - At 03:45 I cross out the wrong 7. Whoops. Gives 117 instead of 171. First spotted by Ryan Parker (no relation). - I think that's all. Let me know if you spot any more mistakes. As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ And thanks to all my Patreon legends. Your support paid for that cape. Let me know if you have any other video ideas I can use it for. https://www.patreon.com/standupmaths Spoooky wardrobe, make-up, filming and editing by Alex Genn-Bash Spoooky maths animations by Matt Parker Extra-spoooky music by Howard Carter Largely non-spooky design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

My previous video: When Spreadsheets Attack! https://www.youtube.com/watch?v=yb2zkxHDfUE Check out Gemma Arrowsmith (voice and star of Spreadsheets ad) on YouTube: https://www.youtube.com/user/gemmaarrowsmith Details about her courses and everything else she does here: http://gemmaarrowsmith.com/ Seth's shout-out is at 14:15 here: https://youtu.be/TxHhgSIjxDc?t=855 This is the BBC report: https://www.bbc.co.uk/news/technology-54423988 You can read the official government statement on the data loss here: https://coronavirus.data.gov.uk/cases This tweet has not aged well: "sometimes instead of finding and learning how to use a chisel, you turn to the hammer you’re already holding" https://twitter.com/standupmaths/status/1312803615162216449 The tweets were in relation to: Complex Fibonacci Numbers? https://www.youtube.com/watch?v=ghxQA3vvhsk =IF(use = critical, "Formal Software Engineering Process", IF(use = important, "Use a database", "have fun with spreadsheets!")) - Dr Simon Thorne, programme chair of the European Spreadsheet Risks Interest Group http://www.eusprig.org/ My video offering YouTube filming advice: Why are Talk-Show Hosts so Bad at YouTube? A Closer Look https://www.youtube.com/watch?v=tEC8q9i2fOw CORRECTIONS - At 03:23 I say "36,536" when the correct number of rows in an .xls file is "65,536". The on-screen number is correct! - at 06:13 and again at 10:04 I say "National Health England" instead of the correct "Public Health England". I have no idea why my brain did that. I think it merged NHS with PHE. Thanks to my Patreons who mean I can make a whole fake news network at short notice (that's a fake news-network, not a fake-news network). If you join their ranks I can make even more videos! https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming, editing and graphics by Alex Genn-Bash Spreadsheet ad performed by Gemma Arrowsmith Music by Howard Carter Design by Simon Wright and Adam Robinson "Spreadsheets" packaging by Matt Parker MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Check out A Podcast of Unnecessary Detail: https://festivalofthespokennerd.com/podcast/ This is the Maths Inspiration show I'm going with Eugénie on 24 November: http://www.mathsinspiration.com/events/?id=123 We have passes for schools as well as for people watching from home. Huge thanks to Eugénie von Tunzelmann for being my coolest friend and for taking the time to chat with me for this video. Check out all the films she has worked on! https://www.imdb.com/name/nm1590981/ Gravitational Lensing by Spinning Black Holes in Astrophysics, and in the Movie Interstellar https://arxiv.org/abs/1502.03808 Read the free book "Reflections on Relativity" by Kevin Brown https://www.mathpages.com/rr/rrtoc.htm This is an archive of their old post about the time dilatiopause. Complete with retro ASCII equations. https://groups.google.com/forum/?hl=en#!original/sci.physics/2VrFGgiVPi8/F4KK_9MWrlMJ Thanks to Cleon Teunissen for emailing in with a bunch of useful details. http://www.cleonis.nl/ And they recommend this book chapter for more on why the shape of the Earth is an isochrone: http://geosci.uchicago.edu/~kite/doc/Geodynamics_Turcotte_Schubert_part_of_ch_5.pdf Speed dilation equation: http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/tdil.html#c2 Gravity dilation equation: http://hyperphysics.phy-astr.gsu.edu/hbase/Relativ/gratim.html#c4 CORRECTIONS: - Yes, the diagram of the photon clock on the train has a light path of over 45° from the vertical which means the train is going faster than the speed of light. Let’s just agree the train (and everything within it) is not to scale! - Let me know if you spot any more mistakes! Thanks to my Patreons who mean I can film hours of myself talking about relativity and then ask Alex to 'edit that into something which makes sense'. Here is a random subset of those fine Patreon People: Markus Herrmann Chris Connett Elaine Hewitson Neil McGovern Paul LeVan Claire Greenhalgh Erin Eldridge Loren Thomas Patrick Stover Glenn Watson https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Alex Genn-Bash Animations by William Marler Music by Howard Carter Design by Simon Wright and Adam Robinson Clips from Interstellar (2014) are all copyright some combination of Paramount Pictures and Warner Bros. and I thought we could all agree my use here is pretty fair. But they have already put a copyright claim in on this video, so there's that. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Applications for paid internships at Jane Street are open! https://www.janestreet.com/join-jane-street/internships/ A Podcast of Unnecessary Detail is out now: https://festivalofthespokennerd.com/podcast/ Come for the Unnecessary Detail, stay for the A Podcast Of. These are my approximation equations: perimeter ≈ π[53a/3 + 717b/35 - √(269a^2 + 667ab + 371b^2)] perimeter ≈ π(6a/5 + 3b/4) If you can do better, submit it to Matt Parker's Maths Puzzles. https://www.youtube.com/watch?v=qJSHdJX6gB0 https://www.think-maths.co.uk/ellipsepuzzle This was my pervious video featuring ellipsoids: https://youtu.be/l51LcwHOW7s You can buy the ellipse from this video on eBay. I've written on my two new equations and signed it. All money goes to charity (the fantastic Water Aid). https://www.ebay.co.uk/itm/363096345270 Bonus content and a deleted scene are available on my Patreon. https://www.patreon.com/posts/41274351 Huge thanks to all who sent in a recording of them singing "A total ellipse of the chart." Sorry I could not include everyone. These are the people in the video: Helen Arney Steve Hardwick Victoria Saigle Andrew McLaren Fractal Macey Sören Kowalick It all started because of a request I put out on twitter. https://twitter.com/standupmaths/status/1301252952930299904 CORRECTIONS: - So far the only times (I've noticed that) I say "eclipse" instead of "ellipse" are 5:01 and 05:26 which was just after talking about my wife who is a solar physicist. So I think we split the blame 50/50. - It seems everyone but me recognised the Root Mean Square. I think I only associate that with current for some reason! Thanks all. - Let me know if you spot any other mistakes! Thanks to my Patreons who meant I could spend about a week trying to find approximations for the length of ellipses. "Are you still working on that?" Lucie would - rightfully - ask over the weekend. "I'm going the extra mile for my patreon people!" I would reply. Here is a random subset of those fine folks: Benjamin Richter Louie Ruck Matthew Holland Morgan Butt Rathe Hollingum Jeremy Buchanan Sjoerd Wennekes Barry Pitcairn James Dexter Adrian Cowan https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Additional camera work by Lucie Green VFX by Industrial Matt and Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Huge thanks to Chris Hadfield and their amazing team for making these videos possible. https://chrishadfield.ca/ You can watch just my rocket equation derivation without the coolest person in the world getting in the way. https://youtu.be/kqMQSJhRhlQ?t=52 You can go and watch Lucie Green's first two video with Chris Hadfield right now, the third one with 'aurora surfing' is out in a week. https://youtu.be/1AeVys_dJ18 https://youtu.be/Avwip5hpVOE Here is my previous video with Chris where we talk about Orbital Mechanics. https://www.youtube.com/watch?v=PooFvQEN4n8 Our trip to NASA was organised by the fantastic folks over at Cosmic Shambles. https://cosmicshambles.com https://youtube.com/cosmicshambles With thanks to NASA and the team at the Kennedy Space Center Visitor Complex via agreement with Trunkman Productions Ltd and The Cosmic Shambles Network. To discover more about the KSC please visit https://www.kennedyspacecenter.com/ Free resources for teachers! We have a complete guide to the mathematics in this video as well as some student worksheets and activities. https://think-maths.co.uk/standupmaths-videos?yt-rocket#rocket CORRECTIONS - One fantastic correction from Dogan Erbahar which I will paste a copy of here: "When equating the momenta you already put the minus sign in front of v_e. But then at the end you are again substituting on the equation. The resulting equation is correct but that minus sign is there not because of v_e. It is there because your dm is negative that your rocket is losing mass. So should be placed in derivation." - Let me know if you spot any other mistakes! Thanks to my Patreons whose generous funding I used for a vacation to Cocoa Beech Florida NO REFUNDS. (Or maybe everyone involved donated their time, covered their own expenses and my Patreons only had to pay for that flip-chart. True story: I bought that flip-chart in the USA as it seemed silly to fly one over from the UK and afterwards the NASA outreach team kept it, which I think means it officially 'works at NASA'. That flip-chart now has a cooler job than me.) Here is a random subset of those fine Patreon People: Baadrix Stephen Tierney Erin Eldridge Christian Gruber David Wagner Richard Fourie Nicholas Koceja Kristian Joensen Andy B Jordan Scales Filming and editing by Trunkman Productions Extra help during the shoot thanks to Melinda Burton and Joanna Gostling Flipchart by Matt Parker Audio by Peter Doggart Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician http://standupmaths.com/

Huge thanks to Chris Hadfield and for joining me for a day of mathematics. Stay tuned for our next video where we derive the rocket equation! You can go and watch Lucie Green's first video with Chris Hadfield right now: https://www.youtube.com/watch?v=Avwip5hpVOE All about Chris and their amazing team. https://chrishadfield.ca/ Our trip to NASA was organised by the fantastic folks over at Cosmic Shambles. https://cosmicshambles.com https://youtube.com/cosmicshambles With thanks to NASA and the team at the Kennedy Space Center Visitor Complex via agreement with Trunkman Productions Ltd and The Cosmic Shambles Network. To discover more about the KSC please visit https://www.kennedyspacecenter.com/ Free resources for teachers! We have a complete guide to the mathematics in this video as well as some student worksheets and activities. https://think-maths.co.uk/standupmaths-videos?yt-orbit-maths#orbit-maths I should also say we went to Florida to film in February 2020, before the pandemic. Which is why it all looks so normal. It's surreal to think about it now! CORRECTIONS - A few people have pointed out that I’m assuming a circular orbit. Yes indeed: I should have made it clearer in the video we were ignoring elliptical orbits as near-Earth is pretty much perfectly circular. - And people are very upset I said I was in Orlando. Which was my fault: I meant to say “near Orlando” to help non-USA people orient themselves. I figured more people know where Orlando is (roughly) than Cape Canaveral. If it helps: Chris also pointed out my mistake (in the nicest way possible) once that shot was over but we didn’t have time to re-do it. - Let me know if you spot any other mistakes! Thanks to my Patreons who mean I can endure the hardship of a trip to Florida to hang out with an astronaut. Only kidding. I paid for that bit. But they covered the extra production costs. Here is a random subset of those fine Patreon People: George Lawie Jeremy Buchanan amcnea Mark Mann Filming and editing by Trunkman Productions Extra help during the shoot thanks to Melinda Burton and Joanna Gostling Flipchart by Matt Parker Audio by Peter Doggart Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician http://standupmaths.com/

You can pre-order Tim's book How to Make the World Add Up now! https://mathsgear.co.uk/products/how-to-make-the-world-add-up-signed-hardback Watch Tim Harford talk about the Stork-Baby correlation on Numberphile: https://www.youtube.com/watch?v=-n-d1ApBTFw Here is the current Landmark Number recommended toolkit (yours may differ). - population of the country you live in - 'people days' per year in your countries of choice - GDP or total government budget - heigh of some buildings you have seen - a human lifetime is around 30,000 days - million/billion/trillion seconds More about Tim Harford: http://timharford.com/ Huge thanks to The Vintage Red Bus Company for lending us one of their fantastic buses. https://thevintageredbuscompany.co.uk/ "Asteroid the size of a bus hurtles past Earth" https://www.independent.co.uk/news/science/asteroid-the-size-of-a-bus-hurtles-past-earth-9323762.html CORRECTIONS: - We were in front of a long version of the original Routemaster bus which I believe was technically 29.91 feet, but we were told 30 feet and that is an easier unit of measurement. - Let me know if you spot any mistakes! Thanks to my Patreons who mean I can hire a bus and then pay someone to animate a dinosaur walking behind it. Here is a random subset of those fine Patreon People: Ben White Jacob Hartmann Nikola Studer Morgan Butt Alan H. Kragar John Lewis Glenn Watson James Hall Philippe von Bergen https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Trunkman Productions https://trunkman.co.uk/ Additional camerawork by Ben Westaway Animations by William Marler https://www.wmad.co.uk/ Music by Howard Carter Audio by Peter Doggart Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

What is your Mega-Favourite Number? The playlist of #MegaFavNumbers videos is here: https://www.youtube.com/watch?v=R2eQVqdUQLI&list=PLar4u0v66vIodqt3KSZPsYyuULD5meoAo If you make a video about a number bigger than 1,000,000 use the hashtag #MegaFavNumbers and we'll add it to the playlist! Here is my current mega-favourite number: 1,169,809,367,327,212,570,704,813,632,106,852,886,389,036,911 This is the OEIS page for A249836: Numbers n for which tan(n) is greater than n. https://oeis.org/A249836 Thanks very much to Jacob Vecht for emailing me their new interesting integer. Keep an eye out for when all their newly discovered numbers appear on the OEIS. These are the ones I found: tan(1) = 1.6 tan(11) = -226 tan(33) = -75.3 tan(52174) = -181570.3 tan(260515) = 383610.7 tan(573204) = -3402633.8 tan(37362253) = 37754853.4 tan(42781604) = -85369290.4 tan(122925461) = 326900723.5 My terrible code is on github. https://github.com/standupmaths/prime_tan/ CORRECTIONS - None yet: let me know if you spot any mistakes! Thanks to my Patreons who mean I can spend time wrangling a gaggle of youtubers into all making videos on the same topic. Here is a random subset of those fine Patreon People: Louie Ruck Claire Greenhalgh Neil McGovern Ron Hochsprung Alan Flett Matthew Schuster Everett Chouinard Alex Hackman Sjoerd Wennekes Samuel Ytterbrink https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

You can listen to the A Problem Squared podcast here (and everywhere else). Please do! https://aproblemsquared.libsyn.com/ Huge thanks to Dr Laura Graham! Everything they did is on github: https://github.com/laurajanegraham/surface_area/blob/master/surface_area.md All about Laura: https://laurajanegraham.github.io/ Prof Alasdair Rae was also big help and sent me their slides. http://bit.ly/measurelandarea This is that video: https://www.youtube.com/watch?v=pDYkiK90WCM All about Alasdair: http://www.statsmapsnpix.com/ Thanks to Phil Chapman for sending in the question and taking the time to record themselves reading it for me. Geoscience Australia were super helpful and answered all of my ridiculous questions. https://www.ga.gov.au/scientific-topics/national-location-information/dimensions/area-of-australia-states-and-territories Check out Steve Mould's Numberphile video on fractal coast lines. https://www.youtube.com/watch?v=7dcDuVyzb8Y Thanks to Bec Hill: comedian; podcast host; and the new voice of Geoscience Australia. https://www.youtube.com/channel/UC5_iLVNOt2i0fX57v8AjMEQ http://www.bechillcomedian.com/ CORRECTIONS - At 14:02 I accidentally say a 9 instead of a 7 (the area is 247719 not 249719). The on-screen numbers are correct. Phew. - Let me know if you spot any other mistakes. Thanks to my Patreons who mean I can spend tens of days of my life on a silly video like this. Here is a random subset of those fine Patreon People: Cubey Andy B Nicholas Koceja Jordan Scales Malcolm Rowe Sean Derek Chandler Paul LeVan Kristian Joensen Patrick Stover https://www.patreon.com/standupmaths As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Additional filming by Lucie Green A bunch of footage is from Pond5 Audio and music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback

Derek's video: The Bizarre Behavior of Rotating Bodies, Explained https://www.youtube.com/watch?v=1VPfZ_XzisU Based on this amazing footage: Dancing T-handle in zero-g https://www.youtube.com/watch?v=1n-HMSCDYtM Terence Tao's original answer, with update. https://mathoverflow.net/questions/81960/the-dzhanibekov-effect-an-exercise-in-mechanics-or-fiction-explain-mathemat Support me on Patreon and I can make more video like this! https://www.patreon.com/standupmaths We are sat so close because we filmed this in the “before times” of late 2019. Huge thanks to Helen Czerski for spinning a book in zero-G for us. https://www.youtube.com/watch?v=qKbHkYllIr0 https://cosmicshambles.com/video/webseries/zerog Cosmic Shambles (who convinced ESA to launch Helen) also have a Patreon: https://www.patreon.com/cosmicshambles Ben Sparks made the ellipsoid animations for me. Check out their GeoGebra files here: https://www.geogebra.org/m/kuntcc5a https://www.geogebra.org/u/sparksmaths Rotating 3D book was thanks to Tim Waskett of Stone Baked Games. https://www.stonebakedgames.com/ There are plenty more Matt and Hugh videos to learn about moments of inertia and suchlike. https://www.youtube.com/playlist?list=PLhtC92GarkjwweBkdrq5uPzEjnRF6ncCV Hugh Hunt is the Cambridge University Reader in Engineering Dynamics and Vibration. I know! http://www2.eng.cam.ac.uk/~hemh1/ Zero G footage courtesy The Cosmic Shambles Network working in association with the European Space Agency. In flight footage shot by Melanie Cowan. External plane footage courtesy Novespace. CORRECTIONS - At 11:00 and 14:23 I say the axes correspond to the axes of rotation but technically they represent the three different directions of spin. Which is why they are labelled with omegas representing the angular velocities in those directions. - At 05:52 the ellipsoid equation should be “volume” not “area”. First pointed out by Ihsan Khairir. My fault for not paying attention editing the text after copying the previous equations. - Oh my goodness. At 11:50 we missed an “L” in ellipsoid. First pointed out by Daniel Burger. I’m so embarrassed. - Let me know if you spot any other mistakes. Or, you know, make a whole video about it. As always: thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Trunkman Productions Additional filming by Melanie Cowan Audio by Peter Doggart Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Women in Trading and Technology: https://www.janestreet.com/witt.html 21 to 23 September 2020 (deadline to apply: Friday 7 August 2020) These are all of the almost-π calculations I showed: 11^6 ÷ 13 ≈ (156158413/3600)π 17^5 ÷ 11 ≈ (366494029/8920)π 11^6 ÷ 17 ≈ (119415257/3600)π 19^9 ÷ 2^3 ≈ (65249503235207/5082)π 5^9 ÷ 3 ≈ (1226819353/5920)π 7^9 ÷ 19 ≈ (2623750469/3881)π 13^5 ÷ 7 ≈ (154266801/9137)π 21^6 ÷ 5 ≈ (27818908094/5095)π 23^9 ÷ 5^4 ≈ (4030701961529/4394)π Sheena's tweet https://mobile.twitter.com/Sheena2907/status/1129114614321618951 The reddit post https://www.reddit.com/r/CasualMath/comments/bn0k9f/got_this_while_doing_some_calculations_why_does/ Farey sequence https://en.wikipedia.org/wiki/Farey_sequence This is the 'best rational approximation' algorithm I used: https://www.johndcook.com/blog/2010/10/20/best-rational-approximation/ I've tested it on the Casio FX-83GT PLUS and Casio FX-991EX CLASSWIZ. Let me know what calculators you have checked! CORRECTIONS: - At 8:30 I say "13" when I mean "11". Ignore what I say: the on-screen number is correct! - Let me know if you spot anything else. Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Alan Flett Nikola Studer Philippe von Bergen Alan McNea Derek Chandler Jeremy Buchanan Alan H. Malcolm Rowe Glenn Watson Patrick Stover Support my channel and I can make more videos: https://www.patreon.com/standupmaths And of course thanks to Jane Street who support my channel. They're amazing. https://www.janestreet.com/ Filming and editing by Matt Parker Additional camera work by Lucie Green That piano music is No.8 Requiem by Esther Abrami All other music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/ A transcendental number is not the root of any integer polynomial! https://mathworld.wolfram.com/TranscendentalNumber.html

Check out the meta-solution on 3Blue1Brown: https://www.youtube.com/watch?v=wTJI_WuZSwE Thanks to Gordon' s Wine Bar for letting us film in their bar. Ha! It wasn't a dungeon, it was a wine bar all along! (An amazing wine bar at that; definitely visit it next time you're in London (and things are open again)). https://www.gordonswinebar.com/ Also: this was filmed back in February 2020 pre-coronavirus (at least before we knew about it). Which is why we're sat so close together and not wearing masks. And people are phoning a wine bar. For those of you want it all, and you want it now, we've put the complete, unedited footage of Matt and Grant completing the puzzle scenario on Matt's second channel. https://www.youtube.com/watch?v=CEDZyK8UL6M We'll put the deleted footage on the Stand-up Maths patreon page: https://www.patreon.com/posts/39003911 Sorry the audio is a bit hit and miss. Matt's microphone dropped out for a bit so we tried to rescue the audio from Grant's lapel mic. With some success. Puzzle as emailed by Grant to Matt: Prisoner 1 walks in, sees a chessboard where each square has a coin on top, flipped either to heads or tails. The warden places the key under one of the squares, which prisoner 1 sees. Before he leaves, he must turn over one and only one coin. Prisoner 2 then walks in and is supposed to be able to figure out which squares the key is in just by looking at the arrangement of coins. This is the website Matt mentioned with a full breakdown of the solution and interactive boards you can play with. http://datagenetics.com/blog/december12014/index.html CORRECTIONS: - At 20:42 when I (Matt) said "You're now assigning a 64-dimension..." he meant to say "You're now assigning a 6-dimension...". But that is a moot point because Grant can visualise cubes in all dimension spaces with equal ease. - At 24:20 I said Venn and Euler the wrong way around. No one tell Steve Mould! - Let me know if you spot anything else. Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Willy Felton Claire Carroll Matt Langford Steve Davidson James Dexter Stephen Hart Philippe von Bergen Alex Frieder Eric Sexton Matthew Schuster Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Huge thanks to Jane Street! https://www.janestreet.com/join-jane-street/ Check out Ben Sparks's GeoGebra files. Binet formula 2D complex output: https://www.geogebra.org/m/twvvzpga 3D imaginary output of Binet formula: https://www.geogebra.org/m/z6dy9cj5 3D plot of absolute output of Binet formula: https://www.geogebra.org/m/pb7hmxyd My four-part series on Numberphile videos about Fibonacci Numbers (from 2014) starts here. https://www.youtube.com/watch?v=D8ntDpBm6Ok Here is me going on about the square root of five (Numberphile 2018). https://www.youtube.com/watch?v=z1THaBtc5RE This was the Fibonacci puzzle video from Matt Parker's Maths Puzzles. https://www.youtube.com/watch?v=ILrqPpLpwpE Read a whole bunch about "Generalized Fibonacci Sequences and Binet-Fibonacci Curves". https://arxiv.org/pdf/1707.09151.pdf The zero I found was at -9.14202391817 + 2.80064954276i and you can see the exact form here: https://www.wolframalpha.com/input/?i=%2810*pi%29%2F%28pi+%2B+i*%28log%28sqrt%285%29+-+1%29+-+log%281+%2B+sqrt%285%29%29%29%29 Try it for yourself and put the Binet Formula (((1+sqrt(5))/2)^n - ((1-sqrt(5))/2)^n)/sqrt(5) in the Wolfram roots calculator: https://www.wolframalpha.com/widgets/view.jsp?id=b858339e64fa997454dd12f77cb1ece1 This site has everything you'll ever need to know about Fibonacci Numbers. http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/fibFormula.html Buttercup - The original buttercupchallenge https://www.youtube.com/watch?v=l17l_KTAVJ0 CORRECTIONS This was a long video and in hindsight there are a few things I wish I had phrased better. Here they all are: - I misspoke around 01:13 when I said "negative one, zero" as it is clearly "negative one, one, zero". - At 07:53 I mean the negative values -5 to 0. I said it a weird way. - My language at about the 1D input to 2D plot from 09:17 is a bit sloppy. The real values going into the Binet function are not the horizontal axis shown; the plot onscreen is solely the output. - I say "axis" when I mean "plane" or even "complex plane". The big flat thing. Let me know if you spot anything else! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Loren Thomas Richard Dickins Barry Salter Susan Moury Sarah Gerweck Ulrich Kempken Piotr Gary Martin Euler Daniel DeJarnatt Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter (excluding Buttercup) Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

AHGD / BCFE AHBG / DECF The "Stack Folding Challenge" is to fold the two lay-outs I show in the video. But the MPMP meta-puzzle is to work out how many different Stack Folding Challenges are possible. That is to say: how many ways can you fold such a piece of paper so that the top-left rectangle is on the top, facing out. All details about Matt Parker's Maths Puzzles are on the Think Maths website: https://www.think-maths.co.uk/maths-puzzles https://www.think-maths.co.uk/foldingchallenge If you are already subscribed to the main channel, then, fine, here is my second channel. https://www.youtube.com/mattparker2 You can buy the pieces of paper I was using in the video, signed by me. https://www.ebay.co.uk/usr/standupmaths All the money from the sale of Stand-up Maths memorabilia goes to charity. WaterAid is working hard to provide sanitation and hand-washing facilities in places which desperately need them, so either bid on the auctions or donate to them directly. https://www.wateraid.org/uk/donate/covid-19-emergency-appeal CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to Jane Street who are the principal sponsor of my channel. They're amazing. https://www.janestreet.com/ Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Jordan Scales Ben White Bob Folk Claire Greenhalgh Neil McGovern Ron Hochsprung Morgan Butt James Hall Nicholas Koceja Alex Hackman Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Yes, technically we're "NAND psychic". Want to own Matt's red/black sign, signed by him and James? It's being auctioned for charity: https://www.ebay.co.uk/itm/362997607146 James's Singing Banana channel is over here: https://www.youtube.com/user/singingbanana Here is our previous collaboration: "The Difference of Two Squares" https://www.youtube.com/watch?v=LkIK8f4yvOU Want to watch the full unedited footage of us being anti-psychic? We got you covered. https://youtu.be/Ffi5UuX1sJo Need even more unedited footage? in 48 hours I'm going to release the behind-the-scenes footage exclusively for my patreon supporters. https://www.patreon.com/posts/37260361 CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Maksym Borodin Matthew Roberts Iain Kings Tyler Herrmann Cailean Asher Douglas Joost Smits Morgan Butt Alex Hackman Nathaniel Brown Fernando Gaete Ferrari Peter Gerrard Cheryl Lowe Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Thanks to Grant Sanderson (of 3blue1brown fame) for joining me on a fun day out! Best double-check you are definitely subscribed to their channel: https://www.youtube.com/3blue1brown If you are ever in the Bay Area you should totally check out the Computer History Museum. https://computerhistory.org/ Bubbles Whiting - Using Punch Cards - Hollerith and IBM https://www.youtube.com/watch?v=L7jAOcc9kBU Read more about the Hollerith Tabulator! https://www.census.gov/history/www/innovations/technology/the_hollerith_tabulator.html Ben Eater makes amazing videos about computing. https://www.youtube.com/channel/UCS0N5baNlQWJCUrhCEo8WlA Buy the doubling sequence signed by Matt Parker and Grant Sanderson. https://www.ebay.co.uk/itm/362981493936 All the money from the sale of Stand-up Maths memorabilia goes to charity. WaterAid is working hard to provide sanitation and hand-washing facilities in places which desperately need them, so either bid on the auction or donate to them directly. https://www.wateraid.org/uk/ CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to Jane Street who are the principle sponsor of my channel. They're amazing. https://www.janestreet.com/ Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Tracy Parry Iain Kings Maksym Borodin Alex Hackman James Lasse T. Stendan Samuel Ytterbrink Sjoerd Wennekes Cooper Jones Piotr Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Michelle Martin Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Check out the full lecture on the Royal Institution YouTube channel. https://www.youtube.com/watch?v=_q4DrUHKC0Q Ri Christmas Lectures thanks to: The BBC - https://www.bbc.co.uk/programmes/m000crbc The Royal Institution - https://www.rigb.org/christmas-lectures/2019-secrets-and-lies Windfall Films - http://www.windfallfilms.com/show/1054/royal-institution-christmas-lectures.aspx Directed by David Coleman, produced by Laura Voak. Bonus footage filmed and edited by Matt Parker CORRECTIONS - Nothing yet. Let me know if you spot anything! (Although it is too late to change the TV show.) - Update: FINE, the title is now “Parker Machine”. Thanks to my Patreon supports who make what I do possible. Support my channel and I can make more videos: https://www.patreon.com/standupmaths MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

You can enter the submittable part of the puzzle at https://www.think-maths.co.uk/maths-puzzles I wasn't kidding, this is where almost all of my t-shirts come from: https://ugmonk.com/collections/mens Thanks to my co-host Matt Parker. Huge thanks as always to my principle channel sponsor Jane Street! https://www.janestreet.com/ And much thanks to Deanna and Oliver who are now helping us run Matt Parker's Maths Puzzles. Deanna is making the massive sacrifice of giving up her place near the top of the leader board! CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Sarah Gerweck Baadrix Derek Chandler Fernando Gaete F. Brandon Alan Flett Richard Fourie Elaine Hewitson Ahmed Hindawi Alan McNea Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker and Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

You can enter the submittable part of the puzzle at https://www.think-maths.co.uk/maths-puzzles Everything about Vicki is on her website: https://www.vickipipe.co.uk/ Or go straight to the All The Stations channel! https://www.youtube.com/channel/UC7ttKX46nJxUeXZ0aoD4Q5g Get your own random quantum-noise numbers here: https://qrng.anu.edu.au/ These are my scrabble numbers. I have not double checked them, so please let me know if you do. Ten million simulations: Fixed points: 5.9604827 Alphabetical neighbours: 6.6008077 Pairs: 4.3016657 Triples: 0.2712588 Fours: 0.0184608 Fives: 0.0012537 Just two rounds of random shunting: Fixed points: 5.9601175 Alphabetical neighbours: 5.6288508 Pairs: 6.263659 Triples: 0.4552404 Fours: 0.0385577 Fives: 0.0033718 Two random shunts and a 2-2-3-3 shuffle: Fixed points: 5.9590569 Alphabetical neighbours: 7.2059461 Pairs: 4.2509397 Triples: 0.3174862 Fours: 0.0272161 Fives: 0.0023192 Three random shunts and a 2-2-3-3 shuffle: Fixed points: 5.9611759 Alphabetical neighbours: 6.6348292 Pairs: 4.2771024 Triples: 0.2715075 Fours: 0.0184781 Fives: 0.0012264 Here is the submittable puzzle again with the letter values: How many ways, from the 100 standard scrabble tiles, can you choose seven which total 46 points? Clarification: for this we mean distinct scrabble hands (groups of 7 letters), so order does not matter and identical letters are indistinguishable. 9 × A worth 1 point 2 × B worth 3 points 2 × C worth 3 points 4 × D worth 2 points 12 × E worth 1 point 2 × F worth 4 points 3 × G worth 2 points 2 × H worth 4 points 9 × I worth 1 point 1 × J worth 8 points 1 × K worth 5 points 4 × L worth 1 point 2 × M worth 3 points 6 × N worth 1 point 8 × O worth 1 point 2 × P worth 3 points 1 × Q worth 10 points 6 × R worth 1 point 4 × S worth 1 point 6 × T worth 1 point 4 × U worth 1 point 2 × V worth 4 points 2 × W worth 4 points 1 × X worth 8 points 2 × Y worth 4 points 1 × Z worth 10 points 2 × _ worth 0 points Thanks as always to my principle channel sponsor Jane Street! CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Bevan Timm Steve Davidson Aimee Arost Henry Gustafson Emily Dingwell Matt Langford Mikko Daniel DeJarnatt Alex Frieder Will Clark Daniel Brockwell Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/ Ok, here is your hint: see if you can work out how many ways you can get a total of 48 points (there should be 50). Then try 46 points.

UPDATE: I’m hearing reports of calendar apps crashing quite severely. Please only experiment on non-vital apps as you could hypothetically lose data stored in them! But apparently if the app crashes and restarts don’t fix it: a forced restart will. Proceed with caution, at your own risk, and report any findings! Buy a physical book from Waterstones! https://bit.ly/humblepi_waterstones ebook on Amazon: https://www.amazon.com/s?k=humble+pi Audiobook on Audible: https://www.audible.co.uk/pd/Humble-Pi-Audiobook/0241375509 Huge thanks to Nick Day and Ken Taylor who emailed me about this bug. If you find anything out, or know someone who might know, email me: [email protected] If you want to read the part of my book about this, here it is. (Don't tell anyone I let you have it for free.) https://www.dropbox.com/s/ccloc2ql091l1v5/HumblePi-calenduh.pdf?dl=0 This is the video of me talking about the Boeing 787 Dreamliner and the Los Angeles Air Traffic Control Route Center problems. https://www.youtube.com/watch?v=HYgqvapH7ak 2^52 microseconds before 1 January 2001 https://www.wolframalpha.com/input/?i=2%5E52+microseconds+before+1+January+2001 (yes, yes, it is technically off by a microsecond) CFAbsoluteTime Type used to represent a specific point in time relative to the absolute reference date of 1 Jan 2001 00:00:00 GMT https://developer.apple.com/documentation/corefoundation/cfabsolutetime Double-precision floating-point format on wikipedia. https://en.wikipedia.org/wiki/Double-precision_floating-point_format CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Toby O'Neil Nate Brown Jordan Scales Matthew Holland Philippe von Bergen Glenn Watson Kevin Mannon David Lake Lucas Werkmeister Jan Strohbeck Support my channel and I can make more videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

All the details for Matt Parker's Maths Puzzles can be found on the Think Maths website: https://www.think-maths.co.uk/maths-puzzles Submit your table solution now! https://www.think-maths.co.uk/table-puzzle We hope these new MPMP videos will be useful for anyone who is bored at home. Or not bored, and commanded to watch them by a parent or teacher. Massive thanks to the channel principle sponsor Jane Street for making this new series possible. You can also check out their Real Numbers videos for even more puzzles. https://www.janestreet.com/real-numbers/ CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Ben White Alan H. Jeremy Buchanan Claire Greenhalgh Louie Ruck Alan McNea Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

UK tour show details will be updated here: http://standupmaths.com/shows/ Check out Christian Lawson-Perfect's cash calculator: https://make-it-rain-bloomberg.glitch.me/ https://twitter.com/christianp/status/1236338871564226561 US edition of Humble Pi http://bit.ly/humblepi UK edition of Humble Pi https://www.penguin.co.uk/books/300/300640/humble-pi/9780141989143.html Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - I said that Bloomberg was still running for the presidential nomination when at the time he had already dropped out. - Let me know if you spot any other mistakes! - Oh, some of my camera work was a bit of a mistake. I need more time to sort out manual settings. Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Paul LeVan Derek Chandler Everett Chouinard Morgan Butt Cubey Nikola Studer Malcolm Rowe Sjoerd Wennekes Andy B Alan Flett Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

So it turns out that this year π = 3.141591678589793935225 Thanks to Ben Sparks, Deanna Judd, Max Hughes and Zoe Griffiths! Huge thanks to the National Trust for letting us film at Woolsthorpe Manor and much appreciation to the on-site staff for being endlessly helpful. Next time you are near Grantham, England you can visit Newton's house for yourself: https://www.nationaltrust.org.uk/woolsthorpe-manor Thanks as always to Jane Street for being the Stand-up Maths channel principle sponsor. This would not have happened without them. https://www.janestreet.com/ Here is the full working out for the derivation of Newton's expression for Pi, including how to get a general expression for the sum: https://www.dropbox.com/s/jndc4y12f2zhnt4/Derivation%20of%20Newton%27s%20Sum.pdf?dl=0 And here are the full Think Maths teacher resources, that includes this workings out, plus further notes for teachers and a worksheet for students: http://think-maths.co.uk/standupmaths-videos?yt-newton-pi#newton-pi Ben's method for calculating the square root of three can be seen on the second channel: https://youtu.be/qknGhrmBZvA Signed copies of much of the working out (one featuring a Parker Square) are available on the Stand-up Maths eBay account. All money goes to charity. https://www.ebay.co.uk/usr/standupmaths SCANS OF ALL WORKING OUT! Any missing working out is for a term which a school did for us. https://www.dropbox.com/s/0hp70cvchuitamr/Pi-day-2020-scans.zip?dl=0 CORRECTIONS - Nothing yet. Let me know if you spot anything! (Or find where we went wrong, so very wrong.) Thanks so much to all the schools who helped out! Names are below. If teachers want to find out about similar projects in the future, sign up here: https://www.think-maths.co.uk/sign-up St John's-Ravenscourt School Winnipeg, Canada, Teachers: Morgan MacLennan and Lam Nguyen Varndean College, UK, Teacher: Nicole Cozens John Taylor High School, UK, Teacher: Simon Curzon Cals College IJsselstein Netherlands, Teacher: Maarten Van Haaren Whitgift School, UK, Teacher: Kathryn Coffin, Students: Paul Ajuwon, Mikaeel Toosy, Wei-Shun Fam, Ashwiyn Sekaran, Mr Lau, James Zhang, Artyom Boyorov South Bromsgrove High School, UK, Teacher: Sue Rowing King Edward VI Aston School, UK, Teacher: Andrew Russell, Students: Mohammed Ali Awan, Adeel Imam Leftwich High School UK, Teacher: Sam Webster, Students: Harri Major George Heriot’s School, Edinburgh, UK, Teacher: Gregor Dickson, Students: Judith Morrow, Euan Strachan, Isaac Browning The Cheney School, Oxford, UK, Teacher: Padma Thealla Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Glenn Watson Neil McGovern John Lewis Patrick Stover James Hall Kragar Ron Hochsprung Jordan Scales Samuel Ytterbrink Philippe von Bergen Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Alex Genn-Bash Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Nerdy maths toys: http://mathsgear.co.uk/

Do check out Jane Street's Real Numbers: https://www.janestreet.com/real-numbers Here is a scan of all the working out: https://www.dropbox.com/s/e0gg5bc891kny3t/pencil-maths.pdf?dl=0 We have a full break down of the working out for teachers: http://think-maths.co.uk/standupmaths-videos?yt-pencils#pencils There are Think Maths free resources for teachers for most of my videos! http://think-maths.co.uk/standupmaths-videos CAMERA ISSUE Yes we did lose the video file from the GoPro filming the working out! So I had to recreate it using a scan of the pages. Which raises a question: which do you prefer? A GoPro pointing at the notes (like from 11:31 onwards) or an animated scan (like up until 11:05)? Let me know your thoughts in the comments! CORRECTIONS - Nothing yet! Let me know if you spot anything. Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Andrew Wieland Alan McNea Richard Dickins Tracy Parry Aimee Arost Henry Gustafson Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions Audio by Peter Doggart Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Hey you! Yes, you in the 62.5%. Subscribe to my channel! This was a quick video I made in a hotel room. I couldn't let 02/02/2020 pass without marking the occasion with a video! Here are the years which are palindromic dates as well as being palindromic splits in the year for the USA and UK style calendars. 22/01/1022 UK 01/02/2010 USA 02/02/2020 UK 02/02/2020 USA 09/12/2190 UK 01/22/2210 USA 12/09/9021 USA 12/29/9221 USA These are the dates on my sheets: USA 08/31/1380 10/02/2001 - 36 years in the 2000s have a palindromic date 09/22/2290 10/03/3001 UK 29/11/1192 10/02/2001 - 60 years in the 2000s have a palindromic date 29/12/2192 10/03/3001 The t-shirt(s?) is from the Ugmonk Mountain range. I love their work. https://ugmonk.com/collections/tees/products/mountains-deep-forest?variant=19307947229241 Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - I messed up the next palindrome date which works for UK and USA style calendars. We've already had November and OCTOBER (not December which I said) and the next one is December: 12/12/2121. First pointed out by Dr Amy. - Typos in description spotted by R Dollarandyou. - Let me know if you spot any mistakes! Other than the exposure not matching. Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Start listening with a 30-day Audible trial. Choose 1 audiobook and 2 Audible Originals absolutely free. Visit http://www.audible.com/standupmaths or text standupmaths to 500 500. If you find my audio book on Audible you will have 9 hours and 33 minutes of me reading out my own words. Look up "Humble Pi" or search 0593166868. That's its audiobook code. I can't link to it directly because everything has to go through audible.com/standupmaths you know how this works. Yes, I am in New York. Yes, I am doing a show! Come and see me on Saturday 25 January at Caveat, Manhattan. https://www.caveat.nyc/event/matt-parkers-humble-pi-when-math-goes-wrong-1-25-2020 The European Spreadsheet Risks Interest Group. Real group, I love them. http://www.eusprig.org/horror-stories.htm Dr. Felienne Hermans and the Enron spreadsheets. https://www.felienne.com/archives/3634 "Gene name errors are widespread in the scientific literature" https://genomebiology.biomedcentral.com/articles/10.1186/s13059-016-1044-7 If you'd like the spreadsheet I was using in the video (for whatever reason) this is it, exactly as I saved it after filming. https://www.dropbox.com/s/e1yy4alqw2tu9st/does%20whatever%20a%20spreadsheet%20can.xlsx?dl=0 Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Malcolm Rowe Iain Kings Linus Tärnqvist Dave Bell Erin Eldridge Tim Curwick Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Genn-Bash Music by Howard Carter Marvel Trailer music by ultrasonik Design by Simon Wright and Alex Genn-Bash MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Pre-order Humble Pi in the USA here: http://bit.ly/humblepi Watch Adam Savage announce his first book club! https://www.youtube.com/watch?v=yr0M5a1eTW0 Huge thanks to Justin Matejka for taking the time to chat with me. They do some amazing work. Follow Justin on twitter! https://twitter.com/JustinMatejka Read all about Justin's plot and the Datasaurus Dozen here: https://www.autodeskresearch.com/publications/samestats Check out the full paper by Justin Matejka and George Fitzmaurice: Same Stats, Different Graphs: Generating Datasets with Varied Appearance and Identical Statistics through Simulated Annealing https://www.autodeskresearch.com/sites/default/files/SameStats-DifferentGraphs.pdf The original Datasaurus plot was thanks to Alberto Cairo. http://www.thefunctionalart.com/2016/08/download-datasaurus-never-trust-summary.html http://albertocairo.com/ The greater Toronto area had a population of 5,928,040 and mean age of 39.7 in the 2016 census. Check out all the data for yourself. https://www12.statcan.gc.ca/census-recensement/2016/dp-pd/prof/details/page.cfm?Lang=E&Geo1=CMACA&Code1=535&Geo2=PR&Code2=35&Data=Count&SearchText=toronto&SearchType=Begins&SearchPR=01&B1=All&TABID=1 Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Richard Dickins Kragar Nikola Studer Colin Williams Sarah Gerweck Ulrich Kempken Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Pre-order the US edition of Humble Pi now! http://bit.ly/humblepi If you forward me a confirmation email of your pre-order to [email protected] I will post the 143 numbered pages to the first 143 people and the remaining 18 pages to a random selection of people who emailed within one week of this video going online. All pages will be signed by me. (Only open to people who live in mainland USA. Sorry.) Download the two documents I was waving around: Anthropometry of Air Force Flying Personnel (1950) https://www.dropbox.com/s/44ob78otovjohpc/Anthropometry%20of%20Air%20Force%20Flying%20Personnel%20%281950%29.pdf?dl=0 The "Average Man"? https://www.dropbox.com/s/bsedsqvgbohy5wg/The%20%22Average%20Man%22%3F.pdf?dl=0 Here is Caroline Criado Perez's book Invisible Women. https://www.amazon.com/Invisible-Women-Data-World-Designed/dp/1419729071 Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Stephen Hart BeeGee Daniel DeJarnatt James Matt Claire Greenhalgh Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Check out Geoff's video from the same day! https://youtu.be/TTHOyTypNs8 This is the Geoff Marshall video about Oyster zones and four-bits. https://www.youtube.com/watch?v=m0xDbHj4K_E My previous video with Geoff: Is the London Underground knotted? https://www.youtube.com/watch?v=b9OEuhdM6t8 Listen to my podcast with Bec Hill: A Problem Squared http://aproblemsquared.libsyn.com/ Thanks to everyone on Patreon who bought me a new lens for my camera. It's exactly the same as the old one. https://www.patreon.com/standupmaths List of all stations with a platform zero in the UK (as of January 2020) in the order I visited them: CARDIFF REDHILL RAINHAM GRAVESEND LONDON KING'S CROSS DONCASTER STOCKPORT EDINBURGH HAYMARKET If you'd like a copy of Geoff’s 'Platform 0' map: http://geofftech.co.uk/download/PlatformZeros.pdf Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - At 18:32 I dip the non-crust end of my pizza in the garlic dipping sauce. I wanted to confess that before anyone complains. It was a long day. - I said that Cardiff has platforms 1 through 8 and actually there is no 5. I had no idea! I only realised watching Geoff’s video. - Let me know if you spot anything else! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Nathaniel Brown Brian Murawski Louie Ruck Jim Fitch Kevin Mannon Brandon Steed Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker and Geoff Marshall Editing by Michelle Martin Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Shamir's Secret Sharing on wikipedia. https://en.wikipedia.org/wiki/Shamir%27s_Secret_Sharing Teaching resource! This was made by a high school teacher in the US to use with Algebra 1, Algebra 2 and Pre-calc. It's a work in progress but you can get it here: https://www.dropbox.com/s/snee4of46ige25g/Shamir%20Secret%20Sharing%20.pdf?dl=0 I made the animated parabola in GeoGebra with help from my mate Ben Sparks. Here is the GeoGebra5 file if you'd like to have a play: https://www.dropbox.com/s/zydcy38eedahbfu/quadratic%20from%20SUMS%20video.ggb?dl=0 Read about finite fields on MathWorld: http://mathworld.wolfram.com/FiniteField.html Shamir Secret Sharing used with Bitcoin: https://blog.trezor.io/shamir-backup-the-revolution-of-private-keys-backup-is-here-858687ed7fe7 And for balance, an argument against using Shamir Sharing with Bitcoin, but rather Multisignature. https://blog.keys.casa/shamirs-secret-sharing-security-shortcomings/ CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks again, as always, to Jane Street for supporting this channel. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Michael Lehenbauer Peter Gerrard Matthew Roberts Ben White Jan Strohbeck Lucas Werkmeister Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

The Ri Lectures are on BBC4 and iPlayer now: https://www.bbc.co.uk/programmes/b00pmbqq They'll be on the Ri channel a month later: https://www.youtube.com/user/TheRoyalInstitution Thanks to Jane Street, pateron supports and all viewers! Here's to another year of mathematics videos. https://www.janestreet.com https://www.patreon.com/standupmaths Pre-order the US edition of my math book Humble Pi. Cheers! http://bit.ly/humblepi Download the excel file from the video: https://www.dropbox.com/s/0c3hx00am0naetx/n-sync.xlsx?dl=0 This is the paper: "Synchronization of Globally Coupled Nonlinear Oscillators: the Rich Behavior of the Kuramoto Model" http://go.owu.edu/~physics/StudentResearch/2005/BryanDaniels/kuramoto_paper.pdf Sorry, Think Maths have not made any teacher resources for this video, but check out their resources for all my other videos here: http://think-maths.co.uk/standupmaths-videos CORRECTIONS - None yet, let me know if you spot any mistakes! - At 10:46 that is the lid falling off my pan. Not really a mistake, but I thought I'd mention it. Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Lucie Roux Emily Dingwell Richard Dickins Fernando Gaete Ferrari Josiah Thornton Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thanks as always to Jane Street for supporting my channel! https://www.janestreet.com/ Of course, Jane Street do not support casual vandalism. And nor do I! Which is why I was using a whiteboard marker and the ".5" was only temporary. If you want to read about the official regulations governing parking spaces in Sydney, check out this PDF. https://www.cityofsydney.nsw.gov.au/__data/assets/pdf_file/0004/119632/DCP11_Section4.pdf Let me know if you see signs anywhere in the world which promise a number of degrees! Think Maths has made a free activity about parking angles and trigonometry that teachers can use in classrooms: http://think-maths.co.uk/standupmaths-videos?yt-parking#parking-angles CORRECTIONS - Good spot by TheLongDark: I say 5.38m when the tape measure shows 4.38m. This is because it was only a 5m tape measure so I had to measure 1m first. - Let me know if you spot any more mistakes! Thanks again for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Alan Flett Jim Fitch Daniel Dewhirst Cheryl Lowe Christian Gruber Ron Hochsprung Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Simon Wright Graphics by Matt Parker Editing by Alex Glenn-Bash Music by Howard Carter Design by Simon Wright, yes the same one. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thanks as always to Jane Street! Here is that blog post about 63-bit numbers. https://blog.janestreet.com/what-is-gained-and-lost-with-63-bit-integers/ My book is out in North America on the 21 January 2020. Pre-order now! http://bit.ly/humblepi Here are the numbers: 9,223,372,036,854,775,798 stops 2^63 = 9,223,372,036,854,775,808 7FFFFFFFFFFFFFF6 111111111111111111111111111111111111111111111111111111111110110 Here are the tweets: Neil Codling @neilcodling 👀 Help, our train home is making 9 quintillion stops. EIZrPtbW4AA3UL2.jpeg https://twitter.com/neilcodling/status/1190757074164170758 Daniel @drawRect Replying to @neilcodling Thanks for the tweet. What version of the app are you using? I thought we fixed this bug AGES ago. https://twitter.com/drawRect/status/1191033767760158720 Lia Buddle @LiaBuddle Replying to @neilcodling Had the same thing in 2017... EIc4CNJXsAATexO.jpeg https://twitter.com/LiaBuddle/status/1190982241914101760 Matt Parker @standupmaths Thanks everyone who sent me this amazing tweet! So, as always it’s probably a binary overflow problem and sure enough 2^63 = 9,223,372,036,854,775,808 which is close! https://twitter.com/standupmaths/status/1190940255974760448 We have a free Think Maths magic trick activity that teachers can use to introduce their students to binary. http://think-maths.co.uk/standupmaths-videos?yt-trains#train-stops CORRECTIONS - None yet, let me know if you spot any mistakes! Thanks again, as always, for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Icaro Fonseca Timothy Lombard Andy B Nokui Peter Tracy Parry Brandon Lindsay Miller Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Order Alex Bellos's book now and get a limited-edition 'Matt verified' copy. https://mathsgear.co.uk/collections/books/products/signed-copy-of-so-you-think-youve-got-problems-by-alex-bellos-pre-order Thanks to Matt Scroggs and the Chalkdust folks for helping organise the volunteers and the maths. http://chalkdustmagazine.com/ Cheers to the Ri for letting us film in their building. https://www.rigb.org/ We have free Think Maths work sheets for any teachers who want to use the prisoner puzzle in their lessons. http://think-maths.co.uk/standupmaths-videos?yt-frog#prisoner-problem CORRECTIONS - Yes, it seems we can’t spell success successfully. - We do know there is a limit I believe, but we don't know what it is. - Let me know if you spot any other mistakes! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Everett Chouinard Lucie Christian Martel Joost Smits Rhys Llewellyn Anthony Allan Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

NEW TOUR DATE: London Bloomsbury Theatre: 29 April 2020 https://www.ucl.ac.uk/culture/whats-on/matt-parker See all my tour dates across October, November 2019 (and April 2020 as announced). http://standupmaths.com/shows/ It will be great to see you at a show. Be sure to hang around and say hello, get your calculator signed, etc! Instructions for the one-cut bat. https://www.think-maths.co.uk/standupmaths-videos?yt-bat#fold-cut-bat Check out Katie's Numberphile video. https://www.youtube.com/watch?v=ZREp1mAPKTM CORRECTIONS - My lapel mic didn't record for the first few sections and I didn't have time to re-film before the show. So, sorry about the audio quality. - Let me know if you spot any other mistakes! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Hari Krishnan Anthony Allan John Lewis Ron Hochsprung Cubey Dean Fantastic Alex Hackman Nokui Andreas Wilfer Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Check out Geoff's video from the same day! https://youtu.be/IIMbF_Amuc4 Thanks very much to Vicki and Geoff for all their help. If you want some more maths, and the 'rules' for finding a Tube Knot, check out the bonus content video on my second channel. https://www.youtube.com/watch?v=Qp2LDpJo-Ng Henry and Sabetta also went and double-checked all of the overs and under in our knot. https://www.youtube.com/watch?v=nJuODe8aVm0 Huge thanks to Sabetta and Henry. Here is the first video I made with them: Exploring Hyperbolic Space with VR https://www.youtube.com/watch?v=MTfviv_aZYI And my spherical camera video with Henry. https://www.youtube.com/watch?v=x0gRcRd_rHs Here is everyone's channel: Vicki Pipe: https://www.youtube.com/user/VickiPipe/ Geoff Marshall: https://www.youtube.com/user/geofftech2 All the Stations: https://www.youtube.com/channel/UC7ttKX46nJxUeXZ0aoD4Q5g Henry Segerman: https://www.youtube.com/user/henryseg Worksheet and teaching resources to find your own underground knots! https://www.think-maths.co.uk/standupmaths-videos?yt-tube#tube Here are the detailed "Carto Metro" maps you can use to check which line goes under/over which. http://carto.metro.free.fr/metro-tram-london/ CORRECTIONS - At 13:19 I call Green Park "West Park" when talking about going west. First noticed by Geoff Marshall, of course. - Let me know if you or Geoff spot anything else! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Deanv Crouch Brandon Bisel Claire Greenhalgh Vojtěch Mělnický Gary Martin Nelson Emerson Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker and Geoff Marshall Editing by Michelle Martin Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Check out more fun mathematics problems at Jane Street's Real Numbers. https://www.janestreet.com/real-numbers/ If you want to have a guess for a river width of 10 (nine lily pads and the opposite bank) then put your guess with the word "guess" in the comments below. If anyone does work out the average guess: let me know! If you have a solution: put that below as well. Be sure to like and comments which you think have cracked the problem. Thanks to Ben Gillott for sharing the puzzle with Timandra. My show "Humble Pi" had a sold-out run at the Fringe and will now be on tour around the UK. Dates and details: http://standupmaths.com/shows/ Timandra has a few more dates for "Take a Risk" and also has a podcast by the same name: https://takeariskshow.com/ Bec Hill is never performing "I'll Be Bec" again but is always doing a million other things: http://www.bechillcomedian.com/ Rob West will be on tour with "Morgan and West: Unbelievable Science" as well as about a dozen magic shows: http://www.morganandwest.co.uk/live-dates/ Git your code here! https://github.com/standupmaths/frog_problem We have Think Maths "Frog Jumps" resources for maths teachers. http://think-maths.co.uk/standupmaths-videos?yt-frog#frog CORRECTIONS - None yet, let me know if you spot anything! - Oh, and this is not really a correction, more of an explanation, but you can see some dark stains on my hands in some shots of this video. That is because I helped Morgan and West load their science show out of the theatre at the end of the Fringe and my reward was to get silver nitrate on me. Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Bruce Patterson Glenn Watson Matthew Holden Patrick Thiel Adam Scatchard William Marple Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Glenn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Do check out Captain Disillusion's video "Quick D: Static Helicopter Blades". http://youtube.com/watch?v=mPHsRcI5LLQ Thanks to Polina for flying the helicopter all day. We hired the helicopter from VVB Aviation who were awesome. https://www.vvb-aviation.com/ My old video about the rolling shutter effect "Rolling Shutter Explained on the Cheap". https://www.youtube.com/watch?v=nP1elMR5qjc Footage of stage coach from "The Lye Green Miniature Stagecoach" https://www.youtube.com/watch?v=BPRXWqhbxFs Footage of the five-blade helicopter from "camera shutter speed matches helicopter`s rotor" https://www.youtube.com/watch?v=yr3ngmRuGUc We have Think Maths "Floating Helicopter" resources for maths teachers. http://think-maths.co.uk/standupmaths-videos?yt-helicopter#helicopter CORRECTIONS - We did also mess around with multiples of the required frame rate (53.5 fps being twice 26.75 fps) which gives a ‘choppy’ version of the stroboscopic effect with twice as many rotors appearing. But I should have taken this out of the edit as I present it as a valid solution. Sorry! First noticed by Alnakar. - Let me know if you spot anything else! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Wouter Dijkslag Laurus Schluep Lucas Werkmeister Greg Holmes Eric Sexton Lucie Roux Simon Hutchings Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Directed by Ben Woolf Filming and editing by Trunkman Productions (http://trunkman.co.uk) Extra cameras and filming by Andrew Mickelburgh Running about by Marius Ulevicius and Melinda Burton Helicoptering by Polina Harkin Music by Howard Carter Audio by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Watch Jade's original video on Tom Scott's channel "How Knot To Hang A Painting". https://www.youtube.com/watch?v=-eVd2Ugk9BU Jade's channel is over here: https://www.youtube.com/channel/UCSIvk78tK2TiviLQn4fSHaw/ And here's a whole bunch of Steve Mould for you to subscribe to: https://www.youtube.com/user/steventhebrave Send in your solutions for hanging a picture badly! [email protected] We have Think Maths resources for any teachers who want to use this as an activity in their class. http://think-maths.co.uk/standupmaths-videos?yt-picture-hanging#picture-hanging You can buy my book which has this puzzle in it: https://mathsgear.co.uk/products/signed-paperback-things-to-make-and-do-in-the-fourth-dimension CORRECTIONS - Nothing yet! Let me know if you spot anything. Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Facundo Gonçalves Borrega Philippe von Bergen Paulo Brito Kevin Petrychyn Magesh Jayapandian Flynn Hembroff Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions Music by Howard Carter Audio by Peter Doggart Design by Simon Wright And probably some stuff by Steve Mould MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Huge thanks to Destin for the chat and footage. Check out their video! https://www.youtube.com/watch?v=Nk0MRxXqo9s I was at the 2 July 2019 total solar eclipse in Argentina: 30°41'07.6"S 68°28'50.2"W My old video "Solar Eclipse Maths and the Cosmic Coincidence of the Saros Cycle" https://www.youtube.com/watch?v=ieUvzy6rnnw We've made some Think Maths teaching resources on approximating pi with a continued fraction. http://think-maths.co.uk/standupmaths-videos?yt-pi-approx#pi-approx The wikipedia page on solar eclipse cycles is actually pretty good. https://en.wikipedia.org/wiki/Eclipse_cycle Wolfram Alpha can sort you out for all your continued fraction needs. https://www.wolframalpha.com/input/?i=continued+fraction+%5B3;+7,+15,+1%5D And this is the page with more about continued fractions than you'll ever want to know. http://www.maths.surrey.ac.uk/hosted-sites/R.Knott/Fibonacci/cfINTRO.html CORRECTIONS - I misspoke a couple of times (303 instead of 333, 2023 instead of 2022) but the correct number was always onscreen. That's what I get for doing it all in one take! - Yes, I mooned the camera. I'm just that on theme. - Let me know if you spot anything else! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Mauro Cioni Emily Dingwell Terence Crisp Alan McNea Colin Williams Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Matt Parker Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Use code "STANDUPMATHS" to get 15% off Curvahedra! https://curvahedra.com/ Note that if you are a patreon supporter of mine, you can get a 25% discount. https://www.patreon.com/posts/28520458 We also sell Curvahedra on Maths Gear but there is no discount. If you're in the UK, the saving on postage might be worth it. You do the maths! https://mathsgear.co.uk/products/curvahedra Here is the bonus chat over on my second channel. https://youtu.be/9z-k2DJ9RbA Read more about the scary version of the Gauss–Bonnet theorem https://en.wikipedia.org/wiki/Gauss%E2%80%93Bonnet_theorem http://mathworld.wolfram.com/Gauss-BonnetFormula.html Edmund Harriss is on Twitter and Numberphile https://twitter.com/gelada https://www.youtube.com/watch?v=6aFcgATW9Mw Check out the Symmetry groups wrapping paper he designed for Maths Gear https://mathsgear.co.uk/products/symmetry-groups-wrapping-paper More about Bathsheba Grossman and her sculptures which inspired Edmund https://bathsheba.com/ You can see my old curvahedra in the background of this video, as well as may others. https://www.youtube.com/watch?v=4CbPksEl51Q CORRECTIONS - None yet, let me know if you spot anything! Thanks as always to Jane Street being my channel's principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Alex Hackman Susan Moury Alex DeMartino Malcolm Rowe Ben White Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming by Matt Parker Editing by Alex Genn-Bash Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

More details about WiSE and WiTT https://www.janestreet.com/witt-wise-email.html Apply for WiSE: Women in STEM Education https://www.janestreet.com/apply-wise/ Apply for WiTT: Women in Trading and Technology https://www.janestreet.com/apply-witt/ Here is the reddit post I first saw: "I designed an Intertwined Mobius strip of Gears. 60parts, 285 balls" https://www.reddit.com/r/3Dprinting/comments/blmqbd/i_designed_an_intertwined_mobius_strip_of_gears/ Just the gif: https://i.redd.it/wi38hd95ebb11.gif Thanks to ElminsCosplay for making the cogs for me! Check out their other stuff. https://www.facebook.com/ElminsCosplay/ If you really want to, you can buy my book: https://mathsgear.co.uk/products/humble-pi-a-comedy-of-maths-errors These are the lectures I mention: What Happens When Maths Goes Wrong? - with Matt Parker https://youtu.be/6JwEYamjXpA?t=290 Matt Parker: "The Greatest Maths Mistakes" | Talks at Google https://youtu.be/34detVy-Hiw?t=391 This is my previous video with Sabetta: Exploring Hyperbolic Space with VR (and crochet) https://www.youtube.com/watch?v=MTfviv_aZYI And check out Henry's crazy gears: Three Gears are Possible - Numberphile https://www.youtube.com/watch?v=5Mf0JpTI_gg CORRECTIONS - When I read the poster I say that education works best when all the parts are “moving” instead of “working”. The first person to complain about this was Steven Brace. - Let me know if you spot anything else! Thanks as always for Jane Street being my principal sponsor. https://www.janestreet.com/ Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Andy Fernando Gaete Ferrari Daniel Brockwell Matt Langford Markus Herrmann Erin Eldridge Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

This is my deep dive into the log(1 + 2 + 3) = log(1) + log(2) + log(3) log troll meme. I'm not going to link to any of the online discussions incase I accidentally encourage brigading. If you want to join in constructively, you can google them. Huge thanks to Jane Street for becoming my channel's principle sponsor. If you're curious, this is what they do: https://www.janestreet.com/what-we-do/ Ask them for a job here: https://www.janestreet.com/join-jane-street/ We make Think Maths teaching resources to go with Stand-up Maths videos. For this one we have a worksheet of questions you can give your students before they watch the video. Plus I provide my excel file for the plot of the max values. https://think-maths.co.uk/standupmaths-videos?yt-logs-meme#logs-meme CORRECTIONS - I mis-spoke and said "two" instead of "four" and "one" instead of "zero" but tried to fix both with titles in the edit. Sorry I did not have time to re-film it! - Yes, my camera autofocus is annoying. I swear it has broken somehow; I thought I'd set it up right this time. I think Jane Street might have to get me a new camera. - Let me know if you spot anything else! Thanks to my Patreon supporters who help make these videos possible. Here is a random subset: Michael Lehenbauer Richard Dickins Barry Salter Maksym Borodin James Williams Sarah Gerweck Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Here is the original Fermat's Library tweet. https://twitter.com/fermatslibrary/status/1052544515632959488 If you want 100% renewable energy: check out Bulb! https://bulb.co.uk/refer/mattp5449 We make Think Maths teaching resources to go with Stand-up Maths videos. For this one we have a cheat sheet to an algebraic proof. http://think-maths.co.uk/standupmaths-videos?yt-calculator-rectangles#calculator-rectangles Many people are asking for the gif. It’s available in different forms in various places online. https://tenor.com/view/matt-parker-parker-square-mindblown-maths-math-gif-11856384 https://imgur.com/gallery/HyPfz Originally a homage to the Tim and Eric gif. From this video: https://youtu.be/LhlqCJjbEa0 The ticking sound in the video was from here. https://freesound.org/people/KentVideoProduction/sounds/159723/ CORRECTIONS - I did not properly think through the hexadecimal example. I meant that any such digits on a base-10 calculator would give multiples of 11. On a true hexadecimal calculator you would get multiples of 17 (or any n+1 for base-n). First spotted by MasterHigure. - Let me know if you spot anything else! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Igor Bogoslavskyi James Williams Magesh Jayapandian David Lake Chris W West Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thanks to Steve Mould for filming with me. Check out his "How viruses self assemble" video. https://youtu.be/3X6qEE2fHvE We have since made the t-shirt I'm wearing available for purchase: https://fotsn.teemill.com/collection/recursive-t-shirt/ We have some free teaching resources for anyone who wants to make a large collaborative fractal! As well as complicated 3D ones we've made a new Think Maths "low-prep giant Sierpinski triangle" guide. http://think-maths.co.uk/standupmaths-videos?yt-PPT-fractals#PPT-fractals The second channel video takes a closer look at the pptx file and the details of what version of PowerPoint you need to make this work. https://youtu.be/5Mltw6cTb-s Tom Wildenhain has since made far more successful PowerPoint fractals than Steve and I were anywhere near. https://youtu.be/O8l_awjgoMI If you want to see the live An Evening of Unnecessary Detail show: it's once a month in London. https://festivalofthespokennerd.com/show/an-evening-of-unnecessary-detail/ Some technical details about the Cantor Set. http://mathworld.wolfram.com/CantorSet.html CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Simon Hutchings Philippe von Bergen Richard Fourie Alan Flett James Tanner Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions: http://trunkman.co.uk Sound production by Peter Doggart Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

See more James Grime over on Singing Banana. https://www.youtube.com/singingbanana He is also on some channel called Numberphile. http://bit.ly/grimevideos We have some teacher notes and activity resources for this video on Think Maths. See if your students can find a better graphical proof for the case of 4k than we did! Spoiler: there is one. http://think-maths.co.uk/standupmaths-videos#two-squares CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Daniel Brahneborg Jan Strohbeck Marcel de Jong Thomas Kristian Hodnemyr Linus Törnqvist Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright Some maths by James Grime. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

More on the GPS roll-over. https://www.theregister.co.uk/2019/02/12/current_gps_epoch_ends/ "In the Future the Modernized GPS Navigation (CNAV and MNAV) message has a 13-bit week number, which for all practical purposes solves this ambiguity" https://www.gps.gov/cgsic/meetings/2017/powers.pdf See me turn on my TomTom: https://www.patreon.com/posts/26065751 If you want to see more hilarious tales about roll-over errors then, well, READ MY BOOK. Get it from Maths Gear and be guaranteed a signed first edition hard back. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 CORRECTIONS - Sorry: I used “overflow” to refer to when the value bursts into the adjacent memory as opposed to just rolling back to zero. But an overflow can simply mean it has rolled over. - I add the extra week bits to the wrong side of the number! Unbelievable. I even point to the other side of the screen in the video. Somehow I totally missed this until it was too late. I’m surprised loads of people are not pointing it out. So far only Kyle K has noticed. Good on you, Kyle. - Let me know if you spot anything else! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Vojtěch Mělnický Fernando Gaete F. James Dexter Colin Williams Alan McNea Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Watch the whole lecture on the Ri channel: https://www.youtube.com/watch?v=6JwEYamjXpA You can buy my book now! Get it from Maths Gear and I'll totally sign it and stuff. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 Thanks to Paul Shepherd from the University of Bath https://researchportal.bath.ac.uk/en/persons/paul-shepherd CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Jazzmanic Emily Dingwell Craig P Steffen Alan Flett Susan Moury Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths The t-shirt I'm wearing is "Woven" by Ugmonk. The discount code STANDUPMATHS should get you 10% off. https://shop.ugmonk.com/products/woven Filming by the Ri Crew Editing by Sarah Dick Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

You can buy Hannah's great book Hello World from loads of places: http://www.hannahfry.co.uk/helloworld Including signed copies on Maths Gear! https://mathsgear.co.uk/collections/books/products/copy-of-signed-copy-of-hello-world My book Humble Pi is available signed on Maths Gear, as well as un-signed from all the usuals. SIGNED https://mathsgear.co.uk/collections/books/products/humble-pi-a-comedy-of-maths-errors UNSIGNED https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The history of Thomas Bayes. http://www-history.mcs.st-andrews.ac.uk/Biographies/Bayes.html All about the theorem named after them. http://mathworld.wolfram.com/BayesTheorem.html Huge thanks to the current residents of the house who tolerated us running around and invading their weekend. All in exchange for two awesome maths books. Thanks to Ben Sparks for crafting the Geogebra animation of the surface. CORRECTIONS - Nothing yet unless you count a slight continuity error with the door in the background. Let me know if you spot anything more serious than that! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Christian Schadewald Thomas Hodnemyr Richard Fourie Maksym Borodin Laura Dale Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions https://trunkman.co.uk/ Sound production by Peter Doggart Design by Simon Wright Runner and assistance by Max MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ NEW BOOKk: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thanks for everyone in the live Q+A! Here is the link to buy Humble Pi: https://mathsgear.co.uk/products/humble-pi-a-comedy-of-maths-errors Support me on patreon and I'll make more videos: https://www.patreon.com/standupmaths Check me out at position number 1! https://www.thetimes.co.uk/magazine/culture/books-the-sunday-times-bestsellers-march-17-g2x7kjsxx Subscribe to my channel and I'll do more live stuff! Thanks!

Join in the Superpermutation effort! The superpermutator google group: https://groups.google.com/forum/#!forum/superpermutators Watch the full song in all its 25-minute glory or download it from Bandcamp: https://youtu.be/n4WpyNMfQ2Q https://standupmaths.bandcamp.com/track/5906-superpermutation-by-greg-egan Details about the new superpermutation are on Greg Egan's website, along with the midi file: http://www.gregegan.net/SCIENCE/Superpermutations/Superpermutations.html#NEWS2 Here is the sheet music if that is your kind of thing: https://s3.boskent.com/superpermutations/7/5906-piano-score.pdf More with Helen talking about if we could play it on church bells. https://youtu.be/CqhzmgtpWvQ James Grime's Numberphile video: Superpermutations - Numberphile https://www.youtube.com/watch?v=wJGE4aEWc28 My previous superpermutation video: the maths problem solved by 4chan https://www.youtube.com/watch?v=OZzIvl1tbPo This is where Robin Houston does his real job: Flourish Data Visualisation http://flourish.studio My book is indeed out now! https://mathsgear.co.uk/products/humble-pi https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The Yamaha Disklavier was hired from the fantastic people at Markson Pianos. They were amazing at organising a last-minute hire. I now recommend them for all your piano needs. http://www.marksonpianos.com/ My book launch was organised by Jo Morgan. She has a teaching resources site! http://www.resourceaholic.com/ The book launch was supported by the fine people at Jane Street. https://www.janestreet.com/ CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: James Tanner Eric Sexton Maksym Borodin Joshua Frey Jim Fitch Brandon Steed Jon Ivy Paul LeVan Paul Jones Kevin Heidemann Mikko Kevin Mannon Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions https://trunkman.co.uk/ Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

http://wwwh.umble-pi.com You can buy my book now! UPDATE: We are out of beam books! Behind the scenes video is here: https://youtu.be/L_pWPM8T-kc Get it from Maths Gear and be guaranteed a signed first edition hard back. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 For teachers (or anyone who would like some extra maths to do!) we have made an activity sheet about infinite series which give pi. https://www.think-maths.co.uk/pi-sums Celebrate Pi Day this 14 March (the date is written 3.14 in some countries; good enough for me!). Check out the fantastic chalkdust magazine: http://chalkdustmagazine.com CORRECTIONS - I’m not worrying about the bending of the beam bringing the forces slightly closer to the turning point. Just getting in before anyone brings it up. - People are upset I said torque instead of moment. I’m sorry. - People are upset I said “one over a fourth” instead of “one over four”. Technically I was wrong. But am TOTALLY NOT SORRY. - Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: David Wagner Bruce Patterson Andrew Jarvis Loren Thomas Thijs Raymakers Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths The t-shirt I'm wearing is "Woven" by Ugmonk. The discount code STANDUPMATHS should get you 10% off. https://shop.ugmonk.com/products/woven Music by Howard Carter Filming and editing by Penguin Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

http://wwwh.umble-pi.com You can buy my book now! Get it from Maths Gear and be guaranteed a signed first edition hard back. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The "About the Null island at 0°0'0" N 0°0'0" E" post I showed is from the GeoGarage blog: http://blog.geogarage.com/2015/04/about-null-island-at-000-n-000-e.html LAPD crime map article by the LA times: https://www.latimes.com/local/la-me-geocoding-errors5-2009apr05-story.html Natural Earth public domain map dataset: https://www.naturalearthdata.com/ CORRECTIONS - Nothing yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Patrick Woitala Jan Strohbeck Christian Gruber Sarah Gerweck Dave Bell Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

http://wwwh.umble-pi.com Please pre-order my book! It's out 7 March 2019. Buy it from Maths Gear and be guaranteed a signed first edition hard back. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 More on the Los Angeles Air Route Traffic Control Center mistake: https://www.nytimes.com/2004/09/16/politics/maintenance-lapse-blamed-for-air-traffic-control-problem.html More on the Boeing 787 Dreamliner mistake: https://arstechnica.co.uk/information-technology/2015/05/boeing-787-dreamliners-contain-a-potentially-catastrophic-software-bug/ CORRECTIONS - If you watch very closely: I misspoke twice while filming and fixed it in post. See if you can spot them! - Not a correction, but more of a fun fact: the plane that flies over me at the start is an A380. How amazing would it have been if it was a Boeing 787‽ - Nothing else found yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Clay Carter Markus Herrmann Kelly Havlik Euler James Tanner Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thanks to the Cambridge Engineering Department for building the pendulum. http://www.eng.cam.ac.uk/ Much appreciation to Maria Kettle and Cambridge Engineering Outreach for organising the day. http://www.eng.cam.ac.uk/events-and-outreach/schools-and-community-outreach And Hugh was there. http://www2.eng.cam.ac.uk/~hemh1/ The Cambridge University Rifle Association were super helpful and let us take over their range for most of the day! Katherine Fleck was our expert shooter with infinite patience. http://cura.soc.srcf.net/ If you have other suggestions for calculating the speed of a bullet: let me know! CORRECTIONS - At 3:17 the close-up shows the sliding box already taped to a piece of paper. I only noticed when uploading that we had used this shot from later in the day by accident. It should have been the shot of the box sliding off the pendulum platform. Our solution to fix this problem was to tape it to a piece of paper. - A few people have asked why we didn’t use a “chronograph”. We did actually use one which detects the movement of the bullet using infrared sensors. But the .22 bullet was too small to trip them. - People have commented that we didn’t need to use the equation for the period as we know the length of the pendulum and the value of g. But the period is really easy to measure accurately by letting the pendulum swing for ages. Length could be measured fairly accurately (guessing the centre of mass) but g would require an extra assumption. - Let me know if you spot anything else! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Nicholas Main Julian Metzler Amanda Pagul Christopher Wilson Claire Greenhalgh Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Sound production by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ NEW BOOKk: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

wwwh.umble-pi.com Please pre-order my book! It's out 7 March 2019. Buy it from Maths Gear and be guaranteed a signed first edition hard back. https://mathsgear.co.uk/products/humble-pi But it is also available on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 Huffington Post article about 3.49 proposal: http://www.huffingtonpost.com/entry/trump-obamacare-changes_us_5894d9f4e4b040613136d98a?jhf5gjzdv58tcsor “According to sources privy to HHS discussions with insurers, officials would argue that since 3.49 “rounds down” to three, the change would still comply with the statute.” Contemporary report from the Schleswig- Holstein German election: http://catless.ncl.ac.uk/Risks/13/37#subj4.1 CORRECTIONS - Not yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Kragar Tim Nichols Ben White Jan Strohbeck P Hammond Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Join in the Superpermutation effort! The best place to start is the google group: https://groups.google.com/forum/#!forum/superpermutators This is where Robin Houston does his real job: Flourish Data Visualisation http://flourish.studio James Grime's video: Superpermutations - Numberphile https://www.youtube.com/watch?v=wJGE4aEWc28 A lower bound on the length of the shortest superpattern Anonymous 4chan Poster, Robin Houston, Jay Pantone, and Vince Vatter https://oeis.org/A180632/a180632.pdf "The Haruhi Problem" More formally, "what is the shortest string containing all permutations of a set of n elements?" http://mathsci.wikia.com/wiki/The_Haruhi_Problem Archived 4chan post. If you don't know what 4chan is: click with caution. https://warosu.org/sci/thread/S3751105#p3751197 Nathaniel Johnston: "The Minimal Superpermutation Problem" http://www.njohnston.ca/2013/04/the-minimal-superpermutation-problem/ Superpermutations by Greg Egan http://www.gregegan.net/SCIENCE/Superpermutations/Superpermutations.html Robin's tweet: "A curious situation. The best known lower bound for the minimal length of superpermutations was proved by an anonymous user of a wiki mainly devoted to anime." https://twitter.com/robinhouston/status/1054637891085918209 LKH: Lin-Kernighan heuristic for solving the traveling salesman problem http://akira.ruc.dk/~keld/research/LKH/ CORRECTIONS - Not yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Lucie Thomas Hodnemyr Euler Jordan Scales Håkan Johansson Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Thirdsday was created (discovered?) by Jim Propp! Read his manifesto here: https://mathenchant.wordpress.com/2018/12/31/introducing-thirdsday/ He's @JimPropp on Twitter: https://twitter.com/JimPropp Here is James Tanton's video "How to Fold or Split Things into Thirds". https://www.youtube.com/watch?v=G8cD5NMOMcs Check out the Think Maths resources to help calculate the digits of a third! https://www.think-maths.co.uk/celebrating-thirdsday And Evelyn Lamb has done a great write-up about Thirdsday for Scientific American. https://blogs.scientificamerican.com/roots-of-unity/how-to-celebrate-thirdsday/ The animation was by Lucas Vieira and you can read more about it at the end of Jim Propp's post. http://1ucasvb.com/ https://mathenchant.wordpress.com/2018/12/31/introducing-thirdsday/#end1 EVE HAD HIT MAX, FOR THE SLY OLD MAN MAX HAD HID HER PET CAT, MOG, AND SHE WAS SAD BUT SHE DID NOT CRY. By Hannah Fisher, 2018. http://twitter.com/allthestations/status/1046836223225057280 CORRECTIONS - I totally missed a “FOR” in Hannah’s short story. Thank goodness the digits still worked! First spotted by JWB_. - Let me know if you spot anything else! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Samuel Ytterbrink David Lake Lucas Werkmeister Mark Prince David Wagner Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Huge thanks to Inder Taneja for crunching the numbers. I asked for a few number facts: they produced a whole paper. Inder's work on their site: https://inderjtaneja.com/2018/12/31/2019-in-numbers/ The full PDF: https://zenodo.org/record/2529103 Here are text version you can copy of all the facts in the video: 2019 = (2×22+2/2)^2 −2−2−2 1+(1+1)^11 − (11−1)×(1+1+1) 9+(9999−9) / 9+9×99+9 (aaaaa−a)×(a+a)−a×aa / a×aa 1+2×34+5×6×(7×8+9) 98+7+65+43^2×1 −1×(2+3)+√[4^(5+6)]−7−8−9 √9+8−7+65×(4+3^(2+1)) (1+2)×(3!!−4!−5+6−7−8−9) 9+(8+7)×(6!/5−4−3−2−1) 0^3 + 1^8 + 2^7 − 3^9 + 4^6 + 5^4 + 6^2 + 7^5 + 8^1 + 9^0 1^4 + 2^4 + 3^4 + 5^4 + 6^4 √[1155^2 + 1656^2] CORRECTIONS - I've just noticed the descending square-root sequence still uses concatenation. Sorry. If you find a better version give me a shout. - Torin Storkey was the first to suggest the solution for zero is: 0! + 0! + 0! + 0! + 0! + 0! + … + 0! = 2019 - Let me know if you spot anything else! For the first time: I'm using the frame from the video youtube automatically picked as the default thumbnail. I can't do better than that. Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Alan McNea Laura Brandon Steed Rick de Bruijne Alex Hackman Support my channel and I can make more maths videos: https://www.patreon.com/standupmaths BUY MY BOOK! https://mathsgear.co.uk/products/5b9fa76f230ffa140094dc43 Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://wwwh.umble-pi.com Nerdy maths toys: http://mathsgear.co.uk/

Humble Pi on Maths Gear: https://mathsgear.co.uk/products/humble-pi Get your free gift when you pre-order! https://www.penguin.co.uk/articles/2018/nov/humble-pi-preorder.html Here it is on Amazon. https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 And Waterstones why not! https://www.waterstones.com/book/humble-pi/matt-parker/9780241360231 Right, now on to details about the actual video. All the photos of retro calculators are from this great website: My Calc DB http://mycalcdb.free.fr/main.php?l=0&p=1 I do not have permission to use the images for anything other than my own personal use. So no, I cannot sell you a copy of "Calculators of 1974". I'm sorry. Because it's amazing. 823 years on Snopes. https://www.snopes.com/fact-check/money-bags/ CORRECTIONS - At 7:38 I say “400 days” when I mean “400 years”. First spotted by Jim Fortune. - User "SmackleFunky" spotted a typo in the above correction. Does that count as a video correction? I'm not sure. - I said 13 days when talking about England's calendar reform of 1752 when they actually skipped 11 days. Sorry! Wednesday 2 September was followed by Thursday 14 September. Spotted by macronencer. - Yes, I had “refor” above instead of “reform”. Another meta-correction! - Let me know if you spot anything else. Preferably in the video and not the corrections. Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Claire Greenhalgh Ben White Willy Marple Sjoerd Wennekes Quinten Palmer Support my channel and I can make more maths videos with a better camera that can hold focus and contrast levels. https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/ Nerdy maths toys: http://mathsgear.co.uk/

BUY IT! https://shop.festivalofthespokennerd.com/ If you think you know how we filmed this: comment below. I bet you're wrong. Filming a stand-up show (even without a stupid extra feature) takes untold effort and money, which foolishly we supplied all ourselves. So we'd love it if you could exchange money for a copy. Get the show from £π direct from https://shop.fotsn.com on download, DVD or floppy disk. Floppy disk is a genuine unique-numbered disk from the full set of 227 it takes to store the show. Comes with a free HD download if you're a quitter! Or search on iTunes, Google Play, Amazon Video, Xbox and YouTube Movies if you just want the show and you want it now. Sadly this is without the unboxing video as there was no easy way to add it to the main show. Which is partly why I put it up on my channel separately so no one misses out. Actually, the big feature of having it as a traditional DVD extra is that we could split it into two chapters and set the second chapter to loop. So while this version on youtube stops around 11 minutes, the DVD version will keep looping until the laser burns through the disc. It's just that versatile. Hey, and thanks for reading all of this description! I didn't get to add any chat to the main video so I'm putting it all down here. I appreciate you letting me vent. CORRECTIONS - The two seconds of black at the beginning is deliberate because it is the file directly from the DVD. I decided to not edit and recompress it but rather leave it exactly the same as what is on the disc. - Let me know if you spot anything else! Support my channel and I can make more maths videos and fewer unboxing videos. https://www.patreon.com/standupmaths Concept and writing by Matt Parker Development and production by Helen Arney Assistance from Lucie Green Filming and editing by Pete Callow Programming and tech support from Seb Lee-Delisle Moral support from Steve Mould MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

DVD, download and floppy disk available here: http://fotsn.com/ycpandvd Please buy it! Watch the section of "You Can't Polish a Nerd" where I introduce the spherical camera: https://www.youtube.com/watch?v=pgyI8aPctaI BONUS video with more spherical footage equations! https://youtu.be/ejcxDIfiZLY Check out Aaron's github: https://github.com/montaga Thanks to Dr Ken for juggling help! https://dodifferent.co.uk/ Spoken Nerd also sell t-shirts and a bunch of other stuff. https://shop.festivalofthespokennerd.com/ If you're in or near the UK, check out our live shows. https://festivalofthespokennerd.com/tickets/ Here is a video I made with Henry ages ago about spherical footage: https://youtu.be/x0gRcRd_rHs CORRECTIONS - None yet. Let me know if you spot anything! Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter DVD production by Mike O’Brien at Brian Productions Filming and editing of youtube video by Trunkman Productions Additional filming by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

DVD, download and floppy disk available here: http://fotsn.com/ycpandvd Steve's video here: https://youtu.be/C91gKuxutTU I make comedy shows about science with Festival Of The Spoken Nerd. Here's a clip from our latest show where I use maths to live manipulate spherical footage. We also sell t-shirts and a bunch of other stuff. https://shop.festivalofthespokennerd.com/ If you're in or near the UK, check out our live shows. https://festivalofthespokennerd.com/tickets/ We sometimes travel. Including Alabama next week! https://www.thinkercon.com/ Check out this video I made with Henry ages ago about spherical footage: https://youtu.be/x0gRcRd_rHs CORRECTIONS - None yet. Let me know if you spot anything! Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter DVD production by Mike O’Brien at Brian Productions Filming and editing of youtube video by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Thanks so much to the Royal Statistics Society, and Jen Rogers in particular, for letting me come along and hang-out at the conference. RSS: https://www.rss.org.uk/ JEN: https://www.jenniferrogers.co.uk/ Basic-level intro to capture-recapture sampling: http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/green_world/ecologyrev2.shtml And some advanced-level details about multi-capture: https://projects.ncsu.edu/cals/course/fw353/Estimate.htm If you want to see my excel spreadsheet: here it is exactly as I saved it while filming. https://www.dropbox.com/s/ec419gmnmm3uazz/recapture_frequencies.xlsx?dl=0 CORRECTIONS - Other than my estimations: no mistakes yet. Let me know if you spot anything! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Ben White Paul LeVan Tyler Herrmann Christian Schadewald Mauro Cioni Laura Dale Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Find the Anki Vector of your dreams here: http://bit.ly/standupmathsvector Vector is Anki’s first home robot with personality and they have sponsored this video and gave me a Vector (but I was free to make whatever video I wanted and state my unbiased opinions). So it’s technically #ad. And thanks to everyone at Anki for taking the time to answer my near-endless technical questions! I'm looking forward to getting Vector home and seeing how he settles in. If you are sick of what the engineers had to say want what to hear from marketing, here is an official list of Vector's features: Fully autonomous, cloud-connected and always-on, alive with personality, highly-intelligent, and aware of his surroundings through touch, sight and sound, entertaining and purposeful. #heyvector Thanks to Rob and Jen who put up with me inviting a robot to stay with us in Brooklyn (I think they secretly loved it). I was in New York to do Maths Inspirations shows for teenagers (and a few talks for adults: sorry if you missed them!). http://www.mathsinspiration.com CORRECTIONS - I looked right at something which was obviously a watering can and called it a "tea pot". This is what happens when I'm away from England for too long. - I said that the rangefinder cannot be used on faces but should have said that is only because Vector cannot angle it up. If you put your face on the table it could safely and accurately calculate the distance to it. I know in the video I cover the option of you watching the video before 12 October. There was some delay in setting the video live and I didn't go back and edit that out. - Let me know if you spot anything else! Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright Exec Lucie Green MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

If you want to see the transfinite ordinals, then check out the Vsauce video "How To Count Past Infinity". https://www.youtube.com/watch?v=SrU9YDoXE88 Here is Simon Pampena's Numberphile video about algebraic and transcendental numbers. https://www.youtube.com/watch?v=seUU2bZtfgM My personal favourite way to order and count the rationals. https://www.youtube.com/watch?v=DpwUVExX27E Watch James Grime show that the reals are uncountably infinite. https://www.youtube.com/watch?v=elvOZm0d4H0 Here's what Mathsworld has to say: http://mathworld.wolfram.com/OrdinalNumber.html http://mathworld.wolfram.com/CardinalNumber.html Here is a good English translation of Cantor's 1874 paper "On a Property of the Class of all Real Algebraic Numbers". https://srjcstaff.santarosa.edu/~jomartin/IrratFiles/Cantors1874Paper.pdf CORRECTIONS - The polynomial which first appears at 3:40 has "n+1" which should be "n-1". - Not all complex numbers are algebraic: only some of them are. I phrased this in an ambiguous way. - Let me know if you spot anything else! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Susan Moury Bruce Patterson Derek Chandler Facundo Gonçalves Borrega Scott Robinson Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Read the paper: "Daylight savings time and myocardial infarction" https://openheart.bmj.com/content/1/1/e000019 Pre-order Humble Pi on Maths Gear! https://mathsgear.co.uk/products/humble-pi You can also pre-order Humble Pi on Amazon: https://www.amazon.co.uk/Humble-Pi-Comedy-Maths-Errors/dp/0241360234/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 EU plans to scrap daylight savings: https://www.reuters.com/article/us-eu-time/eu-seeks-to-scrap-seasonal-clock-changes-in-2019-idUSKCN1LU1O4 Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Nelson Emerson Alan Flett Everett Chouinard Ben White Jeremy Buchanan Support my channel and I can make more videos: https://www.patreon.com/standupmaths CORRECTIONS - People are rather upset I say “savings” rather than “saving”. For which I am truly, deeply slightly sorry. - Let me know if you spot anything else! Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Original tweet by Julio Mulero @juliomulero on 11 September 2018: https://twitter.com/juliomulero/status/1039456605736185856 Previous tweet by Vincent Pantaloni @panlepan on 20 January 2018: https://twitter.com/panlepan/status/954694464697720833 Download Vincent's Geogebra file: https://www.dropbox.com/s/in51f5dyxlzcn13/Lissajous-table-4x4.ggb?dl=0 Here is my near-missajous excel file. https://www.dropbox.com/s/e80jg8wnhgrjic3/parametric%20drawing%20SUM.xlsx?dl=0 Lissajous Curve on Mathworld. http://mathworld.wolfram.com/LissajousCurve.html This is the turntable I used: https://www.amazon.co.uk/dp/B012A0LK8S/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: John Petrilli Yildiz Kabaran Alan McNea Wouter Dijkslag Scott Robinson Support my channel and I can make more videos: https://www.patreon.com/standupmaths CORRECTIONS - Nothing yet. Let me know if you spot anything! Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Read the Nature paper for yourself: "Scutoids are a geometrical solution to three-dimensional packing of epithelia" https://www.nature.com/articles/s41467-018-05376-1 Thanks to Laura and Clara for helping me with the video! You can download Laura's model for free or order a print from Shapeways: https://www.thingiverse.com/thing:3024272 https://www.shapeways.com/product/L4D27PP24/pair-of-packable-scutoids Laura Taalman, James Madison University https://www.jmu.edu/mathstat/people/faculty-full-time/Taalman-Laura.shtml Clara Grima, University of Seville http://personal.us.es/grima/ These are the shows I was doing in Sydney: https://www.mansw.nsw.edu.au/student-activities/mathsinspiration But you can check out the Maths Inspirations shows in the UK: http://mathsinspiration.com/ And we'll be in New York on 2 October 2018: https://momath.org/upcoming-events/maths-on-stage/ Images of cells and stuccoed are all from "Scutoids are a geometrical solution to three-dimensional packing of epithelia". Voronoi demonstration is from here: https://en.wikipedia.org/wiki/Voronoi_diagram#/media/File:Voronoi_growth_euclidean.gif Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Malcolm Rowe Rhys Johnson Brian Lynch Jade Bilkey John Lewis Support my channel and I can make more videos: https://www.patreon.com/standupmaths CORRECTIONS - Yes, I pronounce it SCOO-toid, SCOW-toid, SCOE-toid etc. Sorry. It's new! I actually think ES-COE-TOID is the most correct. - Alex Sweeney noticed that when I describe a prism I say it has rectangle faced sides. But that is only true of right prisms, in general a prism has side faces which are parallelograms. When I later talk about prismatoids I realised I had to be more general and said the sides are faces with three or four edges. But I should have done that earlier. - Let me know if you spot anything! This video is not sponsored by Little Creatures Pale Ale or BBQ Shapes but I am totally open to suggestions. Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

I chat to Daniel from the financial crime and security team at Monzo to talk about how they used maths to detect a data breach at Ticketmaster which exposed people to bank fraud. Here is their post about what happened: https://monzo.com/blog/2018/06/28/ticketmaster-breach/ Thanks to both Daniel and the team of Monzo for letting me in the building and chatting about what they do. As stated in the video: I am a customer of Monzo but this video is not sponsored or supported by them. And extended edit of my chat with Daniel is available on my Patreon page. If you are a teacher and would like to show it to your students let me know and I'll give you the direct link. https://www.patreon.com/posts/20309889 If you also have an interesting job which uses maths and will let me in your building for chat, do get in touch! If you're still at school, then study hard and one day you could have an interesting job which uses maths! Thanks to my Patreon supports who do support these videos and make them possible. Here is a random subset: Paul Bates Neil McGovern William Marple Jordan Scales Adam Scatchard Support my channel and I can make more videos: https://www.patreon.com/standupmaths CORRECTIONS - None yet. Let me know if you spot anything! Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright Sound production by Peter Doggart MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Barry the Psychic Labrador has predicted an England win: https://psychic-pets.com/pets/232 Lilo the Psychic Basset Hound has predicted a Sweden win: https://psychic-pets.com/pets/1246 This video was uploaded before the World Cup quarter-final: England vs Sweden on 7 July 2018. And Barry was right. BAAAAAARY! http://twitter.com/standupmaths/status/1015626452371410944 Check out the Psychic Pets project: http://psychic-pets.com/ The Psychic Pets site has been built by the fine webdevs at Danger Science Group. https://dangerscience.com/ Send all Psychic Pet media enquires to [email protected] You can donate money to help keep the site going via PayPal: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=MKYVJHXPW3TRC Or support me directly on Patreon: https://www.patreon.com/standupmaths Or use this strange base-58 number: 195ucbJHh4NfxdMVjXKwFL9FzFkWFRM5fZ CORRECTIONS - Out of the 133 pets I had 6 missing photos, so I used stock images of the correct animal type. - I typo’d “Colombia” as “Columbia”. My theory is I was thinking of scientist “de Coulomb”. First spotted by Louis Baker, and no doubt soon by many many more people. - Let me know if you spot any mistakes! Music by Howard Carter Filming and editing by Matt Parker Stand-up Maths design by Simon Wright Psychic Pets design by Adam Robinson Barry did all their own stunts. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Go check out the courses on Brilliant! https://brilliant.org/standupmaths Be one of the first n people (for n = 200) to sign-up for a free Brilliant account and get 20% off if you upgrade to paid membership. Here is the original QI tweet: "A whole orange will float on water, but a peeled orange will sink." https://twitter.com/qikipedia/status/970177018561286144 Orange: 246.3g Peel: 97.9g Orange displacement: 231.2g Peel displacement: 109.4g Total Orange: 344.2g Total displacement: 340.6g If you make your own measurements with an orange: send them in to me! [email protected] CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who make these videos (and currently: projects to find psychic pets) possible. Here is a random subset: Lachlan Churchill William Clark Scott Rosenblatt Ivik Injerd David Kidd Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Register your pet at Psychic Pets and start predicting the World Cup games! http://psychic-pets.com/ You can also donate money to help keep the Psychic Pet servers running! Via PayPal: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=MKYVJHXPW3TRC Or support me directly on Patreon: https://www.patreon.com/standupmaths Or use this strange base-58 number: 195ucbJHh4NfxdMVjXKwFL9FzFkWFRM5fZ Free teaching resources over here: http://think-maths.co.uk/psychic-pets Cases for the group stage are below or in this spreadsheet: https://www.dropbox.com/s/3vbwywlpixhueqf/group-cases.xlsx?dl=0 OUTCOME POINTS EXAMPLE W, W, L 6 GAMES: B beats A A beats C A beats D B beats C D beats B D beats C Team_A L, W, W 6 IN Team_D L, W, W 6 OUT Team_B W, W, L 6 Team_C L, L, L 0 W, D, D 5 GAMES: A beats B A and C draw A and D draw C beats B D beats B C and D draw Team_C D, W, D 5 IN Team_A W, D, D 5 OUT Team_D D, W, D 5 Team_B L, L, L 0 W,D, L 4 GAMES: B beats A A beats C A and D draw B and C draw D beats B C and D draw Team_D D, W, D 5 IN Team_A L, W, D 4 OUT Team_B W, D, L 4 Team_C L, D, D 2 W, L, L 3 GAMES: B beats A A beats C D beats A C beats B D beats B D beats C Team_D W, W, W 9 IN Team_A L, W, L 3 OUT Team_B W, L, L 3 Team_C L, W, L 3 D, D, D 3 GAMES: A and B draw A beats C A and D draw B and C draw B and D draw C and D draw Team_A D, W, D 5 IN Team_B D, D, D 3 OUT Team_D D, D, D 3 Team_C L, D, D 2 D, D, L 2 GAMES: A and B draw A and C draw D beats A B and C draw D beats B D beats C Team_D W, W, W 9 IN Team_B D, D, L 2 OUT Team_A D, D, L 2 Team_C D, D, L 2 CORRECTIONS: - Right at the end I say 141 when I mean 142. - I said Australia didn’t get out of the group stage in 2014 World Cup but did in 2010. tbyrn21 has pointed out it was actually the 2006 World Cup when Australia last made it past the group stage! Feels like yesterday. - If you spot anything else let me know! The Psychic Pets site has been built by the fine webdevs at Danger Science Group. https://dangerscience.com/ Send all Psychic Pet media enquires to [email protected] Music by Howard Carter Filming and editing by Matt Parker Stand-up Maths design by Simon Wright Psychic Pets design by Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Register your pet at Psychic Pets and start predicting the World Cup games! http://psychic-pets.com/ If you'd like to help out with vetting the pet videos or translating the site, send me an email: [email protected] You can donate money to help keep the site going via PayPal: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=MKYVJHXPW3TRC Or support me directly on Patreon: https://www.patreon.com/standupmaths Or use this strange base-58 number: 195ucbJHh4NfxdMVjXKwFL9FzFkWFRM5fZ Huge thanks to Steve for bringing Django the Dog along. Do check out Steve's science channel; he also has some plans for the World Cup. https://www.youtube.com/stevemould And introducing Pablo the Wonder Chameleon (Pablo appears courtesy of Trunkman Productions). The Psychic Pets site has been built by the fine webdevs at Danger Science Group. https://dangerscience.com/ Send all Psychic Pet media enquires to [email protected] Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Stand-up Maths design by Simon Wright Psychic Pets design by Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This video sponsored by ME. I mean: MATHS GEAR. Buy my book. https://mathsgear.co.uk/collections/books/products/signed-paperback-things-to-make-and-do-in-the-fourth-dimension My original tweet that started the puzzle! https://twitter.com/standupmaths/status/981178738594533376 Owner of the rug is Andris Bērziņš: @BerzinsAndris You can find it online here: http://www.narma.ee/collection/treski-t65 Download the smaller rug grid: https://www.dropbox.com/s/ozifr0dmy0i2he5/rug-grid.png?dl=0 Hand working out was Calvin Stromwall: @Cstromw https://twitter.com/Cstromw/status/981208250577190913 The code was from Edward Mróz: @inzmru https://twitter.com/inzmru/status/981241767457644544 Animation of the triangles moving around by Samuel Burch: @samisaburch https://www.youtube.com/watch?v=B82nKLqpgo4 If you think you have an answer: tweet (@standupmaths), comment (standupmaths) or email ([email protected]) me. CORRECTIONS - No mistakes spotted yet! Let me know if you see anything which is wrong or the puzzle needs additional clarification. Thanks to my Patreon supporters who made this possible. Here is a random subset: Kragar Tim Nichols Cubey Dean Fantastic Jonathan Anderson Support my channel and I can make more videos. Plus I clearly need a new camera. https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out Lucie’s tour of CERN on the Cosmic Shambles channel: https://www.youtube.com/watch?v=MqMT2c35Wrg If you are a physics kind of person and want to work or do a placement at CERN, go to: http://cern.ch/jobs If you ask nicely anyone can visit CERN. https://visit.cern/ This video is two in a series of three I filmed over there last year. Check out the first one where I go underground at CMS. https://www.youtube.com/watch?v=ZcB6FfAxKlY The Quantum Theory of the Electron (Dirac, 1928) http://rspa.royalsocietypublishing.org/content/117/778/610 Quantised Singularities in the Electromagnetic Field (Dirac, 1931) http://rspa.royalsocietypublishing.org/content/133/821/60 Image of the anti-electron is from ‘The Positive Electron’ Carl D. Anderson, 1933 (page 5). CORRECTIONS - In the comments Chris Ørum has detailed the different between the two antimatter gravity experiments which are not all about the speed of the particles like I said. - Let me know if you spot anything else! Special thanks to Julia Woithe, Jeff Wiener, Benedetta Nirta and the team at CERN. Thanks to my Patreon supporters who made this possible. Here is a random subset: Polly Hammond Sebastian Robbins Daniel Dewhirst Anthony Allan Ben White Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Here is the original tuning fork mystery video. https://www.youtube.com/watch?v=NVUCf8mB1Wg But some people could not get the frequency doubling to work. Now we think we have the start of an explanation. More updates to follow as Hugh and I investigate it further! Here those folks who are not sponsoring this video but did sponsor the previous one: https://brilliant.org/standupmaths CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who enable me to spend a day doing a lot of maths by hand. Here is a random subset: Elaine Hewitson John Lewis Andrew Mohlmann Cameron Ball Erwin Herrsche Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out the puzzles over on Brilliant! https://brilliant.org/standupmaths Use that URL to help support this video and save money off the paid premium Brilliant. There is a follow-up video to this one looking at some other strange vibrations viewers noticed. The Tuning Fork Mystery: an unexpected updatehttps://youtu.be/MdZ-vkfZS0I Possibly over-qualified for this video, Hugh Hunt is a Cambridge University Reader in Engineering Dynamics & Vibration. http://www.eng.cam.ac.uk/profiles/hemh1 See some of the fun stuff he does without me. http://www2.eng.cam.ac.uk/~hemh1/ Check out Mirko’s three-sided coin simulation here. https://almondbread.github.io/tscsim/ All the links for the various three-sided coin resources are here. http://think-maths.co.uk/threesidedcoin CORRECTIONS For the people who couldn’t get it to work at home: https://youtu.be/MdZ-vkfZS0I - Let me know if you spot anything else! Thanks to my Patreon supporters who made these ridiculous projects possible. Here is a random subset: Jon Ivy Erin Cassie Jade Bilkey Laura Dale Samuel Ytterbrink Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Here is the original π video: https://www.youtube.com/watch?v=LhlqCJjbEa0 Watch the long version of the extra working out here: https://www.youtube.com/watch?v=I7YvD7dqsy8 My calculation gave the square root of 10,005 to be 100.02499687578103 Compared to the true value of 100.0249968757810059447921878763577780015950243686963146571... CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who enable me to spend a day doing a lot of maths by hand. Here is a random subset: David McCarthy JR Derek Chandler Mauro Cioni Kevin Petrychyn James Tanner Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

For Pi Day 2018 I calculated π by hand using the Chudnovsky algorithm. https://en.wikipedia.org/wiki/Chudnovsky_algorithm k = 0 42698672/13591409 = 3.141592|751... k = 0 and k = 1 42698670.666333435968/13591408.9999997446 = 3.14159265358979|619... Watch me do the second term working out on my second channel: https://youtu.be/I7YvD7dqsy8 See me do the entire final calculation again (without a mistake) on Patreon: https://www.patreon.com/posts/17542566 Proof that I did actually do it properly: https://www.dropbox.com/s/64vc5iz7yt41r53/chudnovsky-pi-FIXED.pdf?dl=0 This was my attempt two years ago. Look at how much hair I had! https://www.youtube.com/watch?v=HrRMnzANHHs The Chudnovsky Brothers used their algorithm to be the champion pi calculators of the early 1990s: going from half a billion to four billion digits of pi. https://en.wikipedia.org/wiki/Chronology_of_computation_of_%CF%80 This video was filmed at Queen Mary University of London. CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who enable me to spend a day doing a lot of maths by hand. Here is a random subset: Christopher Samples Sean Dempsey-Gregory Emily Dingwell Kenny Hutchings Rick de Bruijne Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Go check out the puzzles over on Brilliant! https://brilliant.org/standupmaths Use the URL above to help support this video and get 20% off the paid premium versions. Once you’ve done that: help us calculate the thickness of a three-sided coin! The bonus video explains how you can get involved. We expanded the audience participation aspect loads after we filmed the main video; which is why a whole second video was required. https://youtu.be/xN5_VO7Nbu8 All the links for the various resources are over here. http://think-maths.co.uk/threesidedcoin Here is the form to sign-up and ask nicely to borrow Hugh’s coins. http://bit.ly/coinrequest Buy or print your own cylindrical coins. https://www.shapeways.com/shops/mathgrrl?section=Education&s=0 Report your data back to us. http://bit.ly/coinsubmit And if you are really bored, here is over an hour of Hugh and I flipping coins. Look, it was late at night. http://youtu.be/tsQv_0hU4Ow CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who made these ridiculous projects possible. Here is a random subset: Edmund Harriss Mikko Manninen Magesh Jayapandian Sjoerd Wennekes Kelly Havlik Cameron Ball Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out Dodecaplex on Maths Gear! https://mathsgear.co.uk/products/dodecaplex-puzzle Dodecaplex is based on the mathematics of Saul Schleimer and Henry Segerman. Henry Segerman http://www.segerman.org/ Saul Schleimer http://homepages.warwick.ac.uk/~masgar/ You can read more about the maths behind Dodecaplex, and the wider family of Quintessence puzzles, in their paper “Puzzling the 120-cell”. https://arxiv.org/abs/1310.3549 As well as this puzzle, Henry has other amazing stuff on his Shapeways page. https://www.shapeways.com/shops/henryseg Watch my previous videos with Henry. All filmed during one mathematical journey to Edinburgh at the glorious Summerhall. The “Brilliant Geometry” one looks more at how 4D shapes are printed in 3D. Exploring Hyperbolic Space with VR (and crochet) https://www.youtube.com/watch?v=MTfviv_aZYI Brilliant Geometry: a physical 3D zoetrope of a 4D cube https://www.youtube.com/watch?v=LOVzytir7bM CORRECTIONS - None yet. Let me know if you spot anything! Thanks to my Patreon supporters who made this series of videos with Henry possible. Here is a random subset: Christopher A Samples Morgan Phillips Laurus Schluep Mitchell Reid Eric Sexton Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Thanks to Helen Czerski for making the video with me! https://www.helenczerski.net/ Helen is physicist, oceanographer and broadcaster in the Department of Mechanical Engineering at University College London. You should check out her book Storm in a Teacup. https://www.amazon.com/dp/0393248968?_encoding=UTF8&tag=stanupmath-20 Watch the Helmholtz equation working out on my second channel: https://youtu.be/shwddzmF-vQ If you need a gif of the champagne cork popping you can download this one. https://www.dropbox.com/s/pvf9dfyg06r3m7t/champagne-gif.gif?dl=0 Previously I used a spectrogram app to measure how fast a fidget spinner can move. https://www.youtube.com/watch?v=OWCAlJ1vsqc I use the SpectrumView app, but there are loads of spectrogram apps out there. http://www.oxfordwaveresearch.com/products/spectrumviewapp/ CORRECTIONS - There is a five-second audio glitch at 10:30 and a second at 15:31 when some wild reverb appears. - At 16:02 I got the “tempurature” spelling wrong! First spotted by planetsoccer99. - Let me know if you spot any other mistakes! Thanks to my Patreon supporters who made this possible. Here is a random subset: Sebastian Lykke Hansen Simon Hutchings Facundo Gonçalves Borrega Jarrad Huby Paul Bates Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Do check out the puzzles over on Brilliant! https://brilliant.org/standupmaths Use the URL above to help support this video and get 20% off the paid premium versions. Here is the second video with even more impossible cubes: https://youtu.be/wKoVKHvMAgE If you now feel the need to own a Rubik’s cubes, head over to Maths Gear. Other cube shops are available. Also, did I mention brilliant.org? https://mathsgear.co.uk/collections/rubiks-cubes Beginner’s guide to solving a Rubik’s Cube. http://think-maths.co.uk/downloads/rubiks-cube-solving-instructions Shout-out to the cubers subreddit. They love this stuff. https://www.reddit.com/r/Cubers/ CORRECTIONS - Annoyingly the video is interlaced. I spotted that after I’d finished filming and it was too late to fix it. It hurts me as much as it hurts you. - Let me know if you spot anything else! Thanks to my Patreon supporters who made this possible. Here is a random subset: Jarod Boyd Mitchell Reid Magesh Jayapandian Sjoerd Wennekes Brian Lynch Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Matt Parker Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out Lucie’s adventure around CMS on the Cosmic Shambles channel: https://www.youtube.com/watch?v=ExSjxf5l0jw This is the live feed of the LHC energies I was looking at: https://op-webtools.web.cern.ch/vistar/vistars.php?usr=LHCLUMINOSITY It's part of this larger portal which has all sorts of in-depth stats: http://www.lhcportal.com/Portal/ This is the public-facing page for LHS statistics: http://acc-stats.web.cern.ch/acc-stats/#lhc/overview-panel Read all about the CMS detector. https://cms.cern/detector If you ask nicely it is possible to visit CERN yourself. https://visit.cern/ CORRECTIONS - At one point I say “collisions” when I mean “crossings”. I fixed it in the onscreen text. - The figure I was given for distance to the collision point forgot the radius of the detector! Which is another 6m. So I was about 18m from the Higgs Bosons being produced. Let’s just call it “under 20m”. - Let me know if you spot any other mistakes! Thanks to my Patreon supporters who made this possible. Here is a random subset: Kevin Mannon Maksym Borodin Edmund Harriss Alasdair Lowe Anthony Allan Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Jen Rogers is a statistics researcher and lecturer at the University of Oxford. https://www.jenniferrogers.co.uk/ We chat about how the scoring system works on Strictly Come Dancing (“Dancing With the Stars” in the USA and other countries). The UK system for dealing with ties is unfair! Jen and I do Maths Inspiration shows together. http://www.mathsinspiration.com/ We’re out doing The Curious Coincidence of Maths in the Daytime in Melbourne next February. https://www.artscentremelbourne.com.au/whats-on/2018/education/curious-maths-in-the-day-time Results from Judges votes Saturday 2 December 2017 Joint first: Alexandra & Gorka Joint first: Debbie & Giovanni Second place: Joe & Katya Third place: Mollie & AJ Joint last: Gemma & Aljaž Joint last: Davood & Nadiya http://www.bbc.co.uk/blogs/strictlycomedancing/entries/34fb3f42-2210-4080-a01f-962719269386 After being combined with the audience rankings the bottom two were Alexandra & Gorka and Davood & Nadiya. But if the ties were done properly that could have been Gemma & Aljaž instead of Alexandra & Gorka. If you have a way to get us the data from the BBC, send me an anonymous email! [email protected] CORRECTIONS: - Shimassi and others have made very important points about how this system favours the public vote. Because a tie means the judges accidentally give extra points to the contestants they’re trying to rank at the bottom. This is my fault for not being clear enough. When we said things like “skewing it towards the judges” and “inflating the judges’s score” we are talking about there being more points being given. Not that the judges were getting their way. Sorry I did a bad job of talking about that and my language was not precise enough. Jen’s main example was that the contestant ranked top by the judges was unfairly moved to the bottom two (and into the dance-off) because the public got their way. In short: the audience can always penalise someone by given them one vote, the judges can’t always do that. Another interesting fairness metric is that someone top-ranked by the judges and bottom-ranked by the audience should be exactly equal to someone bottom-ranked by the judges and top-ranked by the public. But if there is a tie for the judges the audience choice gets an unfair advantage. - Others have pointed out (and David Heath sent a great email to me) that Strictly once had a system like what we describe but they got into trouble because people were paying to phone in and vote for a contestant when it was mathematically impossible for them to be voted out of the dance-off. And the BBC can’t have a phone-in competition if some votes cannot make a difference. This makes for an interesting set of criteria. The voting system needs to be fair, easy to explain to a TV audience and the audience vote is always able to move any given contestant out of the bottom two. Thanks to my Patreon supporters who made this possible. Here is a random subset: Kyle Garner Patrick Stover Michael Tindall Yuval Nehemia Andrew Wieland Support my channel and I can make more videos: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Buy the download! Make some nerds happy! https://shop.festivalofthespokennerd.com/products/just-for-graphs-download That's it really. I'm not sure what else to say. Uh, here's the whole Spoken Nerd shop I guess. http://festivalofthespokennerd.com/shop/ I've also uploaded my scan of the Daily Express if you'd like to take a closer look at the moon fax. Fun story: I've been to the room at Jodrell Bank where this fax was printed. https://www.dropbox.com/s/9ukk66aj8pgrhyh/DailyExpress-moon-fax.jpg?dl=0 I do still get any faxes sent to that number, by the way. SO DON'T GET ANY IDEAS. VHS pause effect from here: https://www.shadertoy.com/view/4lB3Dc CORRECTIONS None yet. Let me know if you spot anything! Thanks to my Patreon supporters, of which here is a random five: David Bell Malcolm Rowe Richard Fourie ROUX Laura Dale Support my channel on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing of Just For Graphs by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

See more data and check out what we changed on the second day (which caused MENACE to learn a different strategy) in the second video: https://youtu.be/KcmjOtkULi4 Check out Matt Scroggs’s original blog post about MENACE and in the amazing Chalkdust magazine. http://www.mscroggs.co.uk/blog/19 http://chalkdustmagazine.com/tag/menace/ Play against the online version of MENACE: http://www.mscroggs.co.uk/menace/ This is the original 1961 “Experiments on the mechanization of game-learning” by Donald Michie. https://www.dropbox.com/s/ycsycu0l01g9643/DonaldMichie.pdf?dl=0 Thanks to Katie Steckles for organising our stall at the Manchester Science Festival and Antonio Benitez for giving us the space. The MENACE crew were: Alison Clarke, Andrew Taylor, Ash Frankland, David Williams, Katie Steckles, Matthew Scroggs, Paul Taylor, Sam Headleand and Zoe Griffiths Get your MENACE data here! https://www.dropbox.com/s/0f9ukxxvh0pgdui/MENACE-data.zip?dl=0 CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my Patreon supporters who made this possible! Here are the random subset I read out during the video: Ben White Scott Robinson Nelson Emerson Amy Sandland Neil McGovern Support my channel and make more videos like this possible! https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Audio mastering by Peter Doggart Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Dr Hugh Hunt is a Reader in Engineering at the University of Cambridge and a Fellow of Trinity College. http://www.hughhunt.co.uk/ Watch Hugh and I calculate how fast a motorbike can go on a wall of death. https://youtu.be/b23i3NhFLDc CORRECTIONS: So far, none yet! Let me know if you spot anything. [And yes: I know the audio is not great. Sorry. Hugh's mic had a load of interference and then died. Better sound next time!] Thanks to my fine Patreon supporters for making this possible! Here is a random selection of five of them: Everett Chouinard Polly Hammond Joshua Freihaut Doug Jones Eric Sexton You can support me as well! https://www.patreon.com/standupmaths Music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Maths toys: http://mathsgear.co.uk/

Watch the rest of the Euler Disk Trilogy! - The Maths of Spinning Coins and Euler's Disk https://www.youtube.com/watch?v=8pSLffliCk0 - Matt & Hugh: The Euler Disk Which Spins Forever https://www.youtube.com/watch?v=55gJgCoDld4 Thanks to Steven Mellemans and Sander Wildeman for emailing in with the correction. Dr Hugh Hunt is a Senior Lecturer in Engineering at the University of Cambridge and a Fellow of Trinity College. http://www.hughhunt.co.uk/ Euler Disks are available on Amazon, and probably other places: https://www.amazon.com/Toysmith-791709-Eulers-Disk/dp/B000239E6Q/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 CORRECTIONS: So far, none yet! Let me know if you spot anything. So we can make Part 4. Thanks to my fine Patreon supporters for making this possible! Here is a random selection of five of them: Kelly Havlik Wouter Dijkslag Tianyu Ge Rhys Johnson Elaine Hewitson You can support me as well! https://www.patreon.com/standupmaths Piano music is an original piece “The River” by Frode-5. https://www.youtube.com/watch?v=XVbFC... All other music by Howard Carter Filming and editing by Trunkman Productions Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Non-Euler-Disk maths toys: http://mathsgear.co.uk/

Check out the petition here: https://petition.parliament.uk/petitions/202305 Get your campaign tshirt: https://shop.festivalofthespokennerd.com/collections/frontpage/products/you-cant-polish-a-nerd-t-shirts And we have made the design available to download for free so you can make your own badge, bumper sticker or billboard. https://festivalofthespokennerd.com/mathsballs/ Remember:the number of sides on a pentagon is prime issue. In related news: I’m currently on tour with Festival of the Spoken Nerd: spreading the good word about correct geometry to the people of the UK. http://festivalofthespokennerd.com/tickets/ CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my Patreon supporters who made this possible! Here are a pseudorandom subset: Andrew Jarvis Amy Sandland Michael Tindall Peter Gerrard Simon Hutchings Ian Seymour Paul Bates Alasdair Lowe Adam Scatchard Elaine Hewitson Check out the Patreon bonus football sock footage here: https://www.patreon.com/posts/14781821 Music by Howard Carter Design by Simon Wright Filming, editing, graphics by Matt Parker MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Katie’s postcard is here: https://youtu.be/dFvzUNMU1Lo Hugh’s postcard over here: https://youtu.be/b23i3NhFLDc More about Maths Inspiration shows for sixth formers: http://www.mathsinspiration.com/ We have 2017 shows in Manchester, Winchester, London, Birmingham, Cambridge and Cardiff. I’m speaking at half of them. Which is a total of three shows. Not 1,008.5 shows. Maths Fest 2018 will also be in London and Birmingham: http://maths-fest.com/ Check out Rob on Numberphile. https://www.youtube.com/watch?v=wCyC-K_PnRY Thanks as always to my Patreon supporters. Here is a random subset: Laurus Schluep Chris Roberts Kevin Petrychyn Erin Eldridge Ulrich Kempken CORRECTIONS: None yet. Let me know if you spot anything! Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

See Katie’s postcard here: https://youtu.be/dFvzUNMU1Lo Rob’s postcard over here: https://youtu.be/AB-FA75Tm1I More about Maths Inspiration shows for sixth formers: http://www.mathsinspiration.com/ We have 2017 shows in Manchester, Winchester, London, Birmingham, Cambridge and Cardiff. I’m speaking at half of them. No, that does not mean I am speaking at 1,008.5 shows. Ha ha everyone who suggested that last time. Maths Fest 2018 will also be in London and Birmingham: http://maths-fest.com/ Check out more of Hugh’s videos. https://www.youtube.com/user/spinfun He has been on Stand-up Maths before, and will return again! https://www.youtube.com/watch?v=55gJgCoDld4 Thanks as always to my Patreon supporters. Here is a random subset: Joshua Alan McNea Clément Brisset Susan Moury Sebastian Robbins CORRECTIONS: None yet. Let me know if you spot anything! HONORARY CORRECTION: Yes, the audio is a bit rubbish. We were rushing around backstage filming during gaps in the show and messed-up the levels. Sorry about that! Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

See Hugh's postcard of death here: https://youtu.be/b23i3NhFLDc Rob’s postcard is over here: https://youtu.be/AB-FA75Tm1I More about Maths Inspiration shows for sixth formers: http://www.mathsinspiration.com/ We have 2017 shows in Manchester, Winchester, London, Birmingham, Cambridge and Cardiff. I’m speaking at half of them. More shows to come in 2018. Maths Fest 2018 will also be in London and Birmingham: http://maths-fest.com/ Check out more of Katie’s videos. https://www.youtube.com/channel/UC6pa695qOSKKQ_PGba6Dl0A She is also on Numberphile. https://www.youtube.com/watch?v=ZREp1mAPKTM Thanks as always to my Patreon supporters. Here is a random subset: Alex DeMartino James Tanner Daniel Dewhirst David Wagner Patrick Woitala CORRECTIONS: - People have pointed out you cannot have a graph with only one odd node. This is indeed correct (or indeed any odd number of odd nodes). But we'd argue you definitely cannot draw over a graph which does not exist. Sorry for not being more explicit! - Let me know if you spot anything else! Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

The Coriolis Effect Test: two hemispheres, one sink Disproven! The Coriolis Effect does not make the water drain out a sink anti-clockwise in the Northern Hemisphere and clockwise in the Southern. Have you taken the same sink to both hemispheres? If so: send in your data to add to mine. Northern: Clockwise, clockwise, clockwise, clockwise, clockwise. Southern: Anti-clockwise, anti-clockwise, clockwise, anti-clockwise, clockwise. SmarterEveryDay: The Truth About Toilet Swirl - Northern Hemisphere https://www.youtube.com/watch?v=aDorTBEhEtk Veritasium: The Truth About Toilet Swirl - Southern Hemisphere https://www.youtube.com/watch?v=ihv4f7VMeJw Thanks to my Patreon supporters who made this possible! Here are a random subset: Ben White Jade Bilkey Scott Robinson Amy Sandland Mikko Manninen If you’re wondering how I transported the sink from one hemisphere to the other: that is covered in the Patreon behind-the-scenes footage for this week. Support me on Patreon for as little as $1.11 and get access to all bonus content. https://www.patreon.com/posts/14451207 Huge thanks to Trent Burton who filmed the video in London, Simon Wright who filmed the Sydney footage and Jen Rogers who was the on-site runner and statistical consultant. Trent then nearly died trying to do the edit. The sink was donated to a recycling centre in Sydney. It was last seen by the front door of Reverse Garbage (Addison Road, Marrickville, NSW). If anyone wants to buy the sink, it may still be there! If anyone checks on the sink let me know if you find it or not. Last known photo of the sink: https://imgur.com/a/VwPe2 CORRECTIONS: - It sounds like I say "Dustin" at one point instead of "Destin", sorry about that. I got the wrong name wrong. - Let me know if you spot anything else! The photo of Earth was taken on 6 July 2017 by the Deep Space Climate Observatory (DSCOVR) satellite. Image by NASA. https://www.nasa.gov/image-feature/africa-and-europe-from-a-million-miles-away Northern Hemisphere anti-clockwise storm is Hurricane Katrina from 2005. Image by NASA. https://earthobservatory.nasa.gov/NaturalHazards/view.php?id=15395 Souther Hemisphere clockwise storm is Cyclone Debbie from 2017. Image by NASA. https://www.flickr.com/photos/gsfc/32888660583 Training in the Fire by Twin Musicom is licensed under a Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/) Artist: http://www.twinmusicom.org/ Music by Howard Carter Design and filming by Simon Wright Filming and editing by Trunkman Productions Additional help by Jen Rogers MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Spoiler! Value for i^i is below. Enjoy some more e^iπ with 3blue1brown's first video: https://www.youtube.com/watch?v=F_0yfvm0UoU Plus the 2017 follow-up video with extra Group Theory: https://www.youtube.com/watch?v=mvmuCPvRoWQ UPDATE: People have pointed out that I've been beaten to the video punch by blackpenredpen! They are also much more thorough about the multiple-value problem. https://www.youtube.com/watch?v=ABk1HK2AR2E If you don’t believe my value for i^i, I appeal to Wolfram Alpha. https://www.wolframalpha.com/input/?i=i%5Ei For those of you who just want to see the digits, here they are: i^i = 0.20787957635076190854695561983497877003387784163176960807513588305541987728548213978860027786542603534052177330723502180819061973037466398699991126317864120573171777952006743376649542246381929737430538703760051890663033049700519005556200475866205294351834431843455027479745344769934714172383230815271481800760921074192047151878353489584821890186029582331295662952070823409567696363742039451439394183861901080820897771751705004348176454751714529894341134142... CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my many Patreon supporters! Here is a subset: Christian Gruber Emily Dingwell Jeremy Buchanan Mauro Cioni Neil McGovern Support my videos on Patreon: https://www.patreon.com/standupmaths If you’re a Patreon supporter of my channel, you can see the behind the scenes of how I filmed this. I didn’t have much time to film so I used my quick-filming studio set-up. New studio renovations are on their way! https://www.patreon.com/posts/14340392 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

I had a great time in Chicago. Thanks to everyone who made it such a fantastic trip. Here’s the page on my website for speaking at conferences etc: http://standupmaths.com/speaking/ Rising Chicago timeline: 1830: Population below 100 1850s: Population around 100,000 1856: Sewer built above street level 1858: First building raised 1860: Half a block of buildings raised at once 1861: Tremont House hotel raised with guests inside 1871: Great Chicago Fire I did enjoy my trip to the Chicago History Museum and the staff were very helpful. https://www.chicagohistory.org/ This was the best online guide to the raising of Chicago which I found. http://users.ox.ac.uk/~sedm1912/lch.html This is also a good read. https://chicagology.com/prefire/raising/ The quote from David Macrae is from the second volume of The Americans at Home on pages 190 and 191. https://books.google.com/books/about/THE_AMERICANS_AT_HOME_PEN_AND_INK_SKETCH.html?id=Lbx6L4epEDUC See the Edison video (actually filmed by William Heise and James H White) at the Library of Congress. “Corner Madison and State Streets, Chicago” https://www.loc.gov/item/00694183/ Photo of screw jack taken by Johnalden. https://commons.wikimedia.org/wiki/File:House_Jack_2.5_tons.jpg CORRECTIONS: Two slight additions below. Let me know if you spot anything else. - I regret not adding metric conversions in subtitles. I was describing a historical engineering feat which was all done in feet but wish I'd pasted the metric values on-screen. - I did not mention how the screw jacks got under the buildings to start with! I assume they just took them into the basement and began lifting from there. Thanks to my many Patreon supports! Here is a subset: Doug Jones Andrew Mohlmann Clément Brisset Michael Tindall Joshua Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Details about Sabetta and the hyperbolic VR project (with links to code) can be found here: http://elevr.com/portfolio/hyperbolic-vr/ Madeleine Shepherd makes some great mathematical objects out of yard and fabric. http://www.madeleineshepherd.co.uk/ Check out Henry’s shapes on shapeways. https://www.shapeways.com/shops/henryseg Watch my previous video with Henry. https://www.youtube.com/watch?v=LOVzytir7bM And Henry’s written a book about Visualizing Mathematics with 3D Printing. http://www.3dprintmath.com/ Filmed with the kind support of the Summerhall in Edinburgh. https://www.summerhall.co.uk/ Sorry some of the audio is a bit sketchy. We had a corrupted card in the main audio recorder and so had to piece bits together from the back-up recordings. CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my many Patreon supports! Here is a subset: Eric Sexton Malcolm Rowe Jörgen Englund David Wagner Fredrik Petrini Support my videos on Patreon: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out Henry’s shapes on shapeways. https://www.shapeways.com/shops/henryseg And he’s written a book about this stuff: Visualizing Mathematics with 3D Printing http://www.3dprintmath.com/ Huge thanks to the University of Warwick for supporting the Brilliant Geometry exhibition and University of Edinburgh for hosting it. More details about it here. http://www.maths.ed.ac.uk/~aar/brilliantgeometry/ Peter Reid built the Zoetrope, here is his FUSION page. http://www.scifun.ed.ac.uk/fusion/fusion-team.html If you’re a Patreon supporter of my channel, you can see under the hood of the zoetrope. https://www.patreon.com/posts/13128808 The Brilliant Geometry was a also collaboration with the fantastic Saul Schleimer. https://www2.warwick.ac.uk/fac/sci/maths/people/staff/saul_schleimer/ The exhibition was held in the Summerhall in Edinburgh but is no longer on. I mean, the Summerhall is still there doing cool stuff but Henry and Saul have packed-up their shapes and gone home. https://www.summerhall.co.uk/ CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my many Patreon supports! Here is a subset: Susan Moury Andrew Wieland Sebastian Robbins Mauro Cioni Phyphor Support my videos on Patreon: https://www.patreon.com/standupmaths Filming and editing by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

World Rubik's Cube record holder Feliks Zemdegs solves Rubik's Cubes in under 10 seconds for drunk Australians. Matt and Feliks were at The Imperial Hotel on Bourke Street, Melbourne. It’s an awesome pub with great staff. http://bourkestreetimperial.com/ Learn to speed cube with Feliks! https://cubeskills.com/ Or if you are a beginner: start you Rubik's journey here. http://think-maths.co.uk/downloads/rubiks-cube-solving-instructions Buy yo'self a speed cube! https://mathsgear.co.uk/collections/rubiks-cubes Watch Feliks and Matt chat with Robin Ince. https://www.youtube.com/watch?v=enZkGRPEBYI Here is Matt’s extended interview with Feliks. https://www.youtube.com/watch?v=uhuqp7CVmxw Feliks uploads his Rubik's World Records to his channel. https://www.youtube.com/user/fazrulz1 CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my many Patreon supports! Here is a subset: David Bell Alex Hackman Anthony Allan Erin Eldridge Robert Sundling Support my videos on Patreon: https://www.patreon.com/standupmaths Download the Stand-up Maths theme song for free! https://standupmaths.bandcamp.com/ Filming by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

My low-budget and minimal-effort version of Destin’s Smarter Every Day video: https://www.youtube.com/watch?v=dNVtMmLlnoE The python code I wrote is on github. https://github.com/standupmaths/rolling_shutter/blob/master/rollingshutter.py Someone has already made a better version of the code with a nicer interface! https://github.com/alexd3rsan/rollingshutterpy Check-out the behind the scenes of how Destin made his video. So. Much. Effort. https://www.youtube.com/watch?v=eMJFpj-0ogA You can download the image of the colour propellors I printed. https://www.dropbox.com/s/48d44nmsu9wly67/colour_prop.png?dl=0 Bursting balloon shadow photo is from here. http://imgur.com/a/bv3A9 And Richard Wiseman featured the bursting balloon on his blog. https://richardwiseman.wordpress.com/2011/05/18/can-you-solve-the-mystery-of-the-balloons/ Piano music is an original piece “One Hundred Reasons” by Frode-5. https://www.youtube.com/watch?v=7VHty1SaAYQ CORRECTIONS: None yet. Let me know if you spot anything! Thanks to my many Patreon supports! Here is a subset: Laura Dale Jade Bilkey Tim Davies William Marple Yuval Nehemia Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

I was in Melbourne in April 2017 and so I dropped by to have a chat with Feliks Zemdegs: the perpetual Rubik's Cube World Champion. We talk about his recent 4.73 second record-breaking solve, how solving other types of Rubiks puzzles are different (Megaminx, 4×4, 5×5 etc) and how fast he thinks the world records can get. If you want to learn speed cubing: Feliks has a website with tutorial videos! https://cubeskills.com/ Or buy yourself a speed cube. https://mathsgear.co.uk/collections/rubiks-cubes Check out Feliks’s 4.73 second solve sat next to Mats Valk. https://www.youtube.com/watch?v=R07JiT0PlcE He puts videos of his new records up on his channel (including his new 3×3 average record of 5.97 seconds). https://www.youtube.com/fazrulz1 His dad also has a channel! https://www.youtube.com/watch?v=1xa_fGG0VxU Here is the video of when I went to a cubing comp. https://www.youtube.com/watch?v=NzfSombRHIM And my interview with Mats Valk. https://www.youtube.com/watch?v=VEsFoinLHrk Current list of Rubik’s World Records: https://www.worldcubeassociation.org/results/regions.php CORRECTIONS: None yet. Let me know if you spot anything (other than records which have since been broken and so the ones mentioned in the video are no longer true). Thanks to my many Patreon supports! Here is a subset: Tianyu Ge Samuel Ytterbrink Philippe von Bergen Ben White Adam Scatchard Support my videos on Patreon: https://www.patreon.com/standupmaths Filming by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Use some mathematics to work out how fast a Fidget Spinner spins. In fidgets/second. Follow-on video by Steve Mould: https://youtu.be/G7hh42AgBlQ Maths and science teachers: please do torment your students with this experiment. All they need is a Fidget Spinner and a phone; the two things they refuse to be without. I used the SpectrumView app, but there are loads of spectrogram apps out there. http://www.oxfordwaveresearch.com/products/spectrumviewapp/ The audio the spectrogram recorded is here whynot. https://soundcloud.com/user-719527707/fidget-spinner-recording This is the plot on the spectrogram screen showing the max frequency. https://www.dropbox.com/s/33r45m34h3puslw/fidget-spinner-plot.PNG?dl=0 Thanks to Hugh Hunt for his help with this video. He showed me how to measure speed with a spectrogram. https://www.youtube.com/user/spinfun CORRECTIONS: None yet. Let me know if you spot anything! Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

If you missed PART I it’s here. https://www.youtube.com/watch?v=NzfSombRHIM Here are some resources I made to learn how to solve a Rubik’s cube, but there are loads more on youtube. http://think-maths.co.uk/downloads/rubiks-cube-solving-instructions https://www.youtube.com/watch?v=0Li_tLtgddo This video features Katie Steckles who has more videos on youtube. https://www.youtube.com/user/st3cks Buy yourself a speed cube. You deserve it. https://mathsgear.co.uk/collections/rubiks-cubes To find your local Rubik’s Comps, check out the World Cube Association. https://www.worldcubeassociation.org/ Here is my official WCA world ranking. Which means there are only about 60,000 people who are better at the Rubik’s Cube than me! https://www.worldcubeassociation.org/persons/2016PARK24 This video is completely thank to my Patreon supporters, of which a strict subset is: Clément Brisset Timothy Lombard Brandon Connors PhotonBurst CORRECTIONS: - At 4:09 I say "Rubik's Square" instead of the actual name of that puzzle: "Square 1". First spotted by Quinson Hon. Let me know if you spot anything else! Support my videos on Patreon: https://www.patreon.com/standupmaths Video by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Watch Part II and see who won! https://www.youtube.com/watch?v=ndEVnYhCMzo To find your local Rubik’s Comps, check out the World Cube Association. https://www.worldcubeassociation.org/ This UK comp was held in Bristol in November 2016. Detail are on the UKCA site. http://www.ukca.org/competitions/past-competitions/uk-championship-2016 Here is my official WCA world ranking. Which means there are only about 60,000 people who are better at the Rubik’s Cube than me! https://www.worldcubeassociation.org/persons/2016PARK24 Here are some resources I made to learn how to solve a Rubik’s cube, but there are loads more on youtube. http://think-maths.co.uk/downloads/rubiks-cube-solving-instructions https://www.youtube.com/watch?v=0Li_tLtgddo Buy yourself a speed cube. You deserve it. https://mathsgear.co.uk/collections/rubiks-cubes This was the first video project I was able to do because of my Patreon supporters. Thanks so much everyone! It’s taken a while to get it out because it was a complicated edit (we filmed a lot of stuff) and other videos kept taking priority. But here it is now. You all made it possible. CORRECTIONS: None yet. Let me know if you spot anything! Support my videos on Patreon: https://www.patreon.com/standupmaths Video by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out the corresponding video I made with Steve Mould for his channel. https://youtu.be/O3RsDIWB7s0 Thomas Hales’s proof of the Kepler Conjecture. http://annals.math.princeton.edu/wp-content/uploads/annals-v162-n3-p01.pdf The Kepler Conjecture on wikipedia. https://en.wikipedia.org/wiki/Kepler_conjecture Cubic Close Packing on Mathworld. http://mathworld.wolfram.com/CubicClosePacking.html CORRECTIONS: None yet. Let me know if you spot anything! Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Behold! Another slightly disappointing magic square. Free tickets for my patreon supporters! https://www.patreon.com/posts/free-tickets-to-9603456 Pre-Order the DVD/download: https://shop.festivalofthespokennerd.com/collections/frontpage/products/58b6b63a4af2381200dfa5f0 Or come see the live recording: http://festivalofthespokennerd.com/buy-tickets/ Futility Closet: “Words and Numbers” https://www.futilitycloset.com/2013/09/27/words-and-numbers-7/ Martin’s tweet. https://twitter.com/MB_Whitworth/status/827810392185372672 Alphameric squares on mathworld. http://mathworld.wolfram.com/AlphamagicSquare.html Alphameric squares on wikipedia (how did I miss this‽) https://en.wikipedia.org/wiki/Alphamagic_square "the most fantastic magic square ever discovered" A Gardner's Workout, 2001 https://books.google.co.uk/books?id=znFb2YKiRCkC&dq=isbn:1568811209 Read Lee Sallow talk about his work in 1986. http://www.leesallows.com/files/AMS%20Part%202.pdf His up-to-date website. http://www.geomagicsquares.com/ The search continues! https://github.com/tuzz/letterwise_magic_squares#solutions My video from MathsJam. https://www.youtube.com/watch?v=cZ1W1vbuYuQ The Numberphile video about the Parker Square. https://www.youtube.com/watch?v=aOT_bG-vWyg CORRECTIONS: - I say “the authors” by accident when talking about A Gardner’s Workout when I meant “the author”. Specifically: the Martin Gardner. - Let me know if you spot anything else! Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

How far can you make a tower lean? Bricks optional. Lower-mass cuboids should work just as well. Previous brick video: The Brick Double-Domino Effect Explained https://www.youtube.com/watch?v=EYkBctqyKic Try to keep the comments spoiler free! But I do not mind calculations for how far a specific number of bricks will reach. If you have in-depth working-out (or a video of you building a tower) which would would like to share: email it over. [email protected] I will do a follow-on video eventually. Support me on Patreon and help me make follow-on videos quicker. https://www.patreon.com/standupmaths CORRECTIONS - None yet! Let me know if you spot any. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

If you use bricks as dominoes: you get a second wave going in the opposite direction. Watch the original brick domino video here: https://www.youtube.com/watch?v=-BTWiZ7CYoI I think that is the original upload. If anyone finds a better one, please do let me know. Support me on Patreon and help me make more videos like this. https://www.patreon.com/standupmaths CORRECTIONS - The overlap length should be 21 - √(21² - 6²) = 0.875 cm not the incorrect √(21² + 6²) - 21 = 0.84 cm I show on-screen. First spotted by Daryl Adriano. - A correction to my masonry terminology! What I called the width is actually the height of a brick (which makes sense given the orientation bricks are normally laid). The width is the third dimension: how far into the wall they reach. Thanks to Doodle Vids. - Let me know if you spot anything else! Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Watch me calculate pi by rolling 1,000 random numbers on two d120 dice. All in the name of celebrating Pi Day 2017. You can watch all 500 rolls of the dice! https://www.youtube.com/watch?v=ESU4KdRLzu0 Here are some proofs that the probability of two random integers being coprime is 6/π². http://www.cut-the-knot.org/m/Probability/TwoCoprime.shtml Download the spreadsheet I make at the end. https://www.dropbox.com/s/8qlhzt76y7ou0xf/putting-the-pi-in-coprime.xlsx?dl=0 You can buy d120 dice from Maths Gear. https://mathsgear.co.uk/collections/dice/products/d120-dice Here’s a nice summary of the Basel Problem from Plus Magazine. https://plus.maths.org/content/basel-problem While we’re talking about the Basel Problem: I cover it in my book. You know, just in case you were wondering. https://mathsgear.co.uk/collections/books/products/signed-paperback-things-to-make-and-do-in-the-fourth-dimension Support me on Patreon and help me make more videos like this. https://www.patreon.com/standupmaths CORRECTIONS - At 12:28 I say that 63 is 3 × 31 when it is of course 3 × 21. Spotted by Nathan James. - Let me know if you spot any more! Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Thanks to Seb Lee-Delisle for recreating the Asteroids vector graphics with his massive laser. Here’s his site: http://seb.ly/ Of course he’s on Github, where you can find out more about controlling lasers with computers: https://github.com/sebleedelisle/ofxLaser Everything was filmed in the Four Quarters, Peckham (SE15 4TP), London. https://en-gb.facebook.com/fourquartersbar/ Filming and editing by Trunkman Productions. http://trunkman.co.uk/ Cheers to my Patreon supporters for making this possible! Mentioned in the video: William Marple Paul Bates Rhys Llewellyn You can support me on Patreon as well! https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Watch me try to calculate how tall the Berlin TV Tower is using a ruler! Berlin also being a great reminder that dividing walls are a terrible idea. Info about the Berlin Fernsehturm TV Tower: https://www.berlin.de/en/attractions-and-sights/3560707-3104052-berlin-tv-tower.en.html If you want to try this, you can check what direction the sun will be shining at any location and for any date/time: http://suncalc.net/#/52.5208,13.4094,16/2017.01.27/14:00 Thank you to Gherardo for lending me a saw while I was in Berlin! CORRECTIONS: None yet, but I’m sure there will be. And if anyone wants to calculate my actual error bars: please do! Thanks to my patreon supporters! Here are a few by name: Neil McGovern Amy Sandland Jade Bilkey Joshua Capel Adam Scatchland Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Here are all the facts and references! FACT 01: It’s a prime number Last: 2011, Next: 2027 https://primes.utm.edu/lists/small/1000.txt FACT 02: Has a digit sum 10 Last: 2008, Next: 2026 Add them up yourself! FACT 03: Has 11 distinct letters Last: 2009, Next: 2019 Here they are: adehnostuvw FACT 04: No letters in common with “Prickly fig” Last: 2010, Next: 7000 Look, none of these: cfgiklpry FACT 05: It is the sum of two squares Last: 2009, Next: 2018 9^2 + 44^2 https://oeis.org/A001481 FACT 06: Prime one more than multiple of 4 Last: 1997, Next: 2029 These are called Pythagorean Primes. http://oeis.org/A002144 FACT 07: Prime one more than multiple of 8 Last: 1993, Next: 2081 http://oeis.org/A007519 FACT 08: Prime one more than a multiple of 16 Last: 1889, Next: 2081 http://oeis.org/A094407 FACT 09: Prime one more than a multiple of 32 Last: 1889, Next: 2081 http://oeis.org/A133870 FACT 10: “2017” is a prime in base 8 Last: 2011, Next: 2111 In base 8, 2017 is 1039. http://oeis.org/A235394 FACT 11: Prime of the form a^2 + b^4 Last: 1777, Next: 2069 http://oeis.org/A028916 FACT 12: I turn a prime age in a prime year Last: 2011, Next: 2027 It’s just one of those things I keep track of. FACT 13: Number n such that both n and (n+1)/2 are primes Last: 1993, Next: 2137 http://oeis.org/A005383 FACT 14 Lower prime of a difference of 10 between consecutive primes Last: 1879, Next: 2029 http://oeis.org/A031928 Here is a list of the largest gaps: https://primes.utm.edu/notes/GapsTable.html FACT 15: Smallest palindrome greater than n in bases n and n+1 Last: 1892, Next: 2146 Other numbers are smaller in other pairs of bases. 2017 is the smallest for bases 31 and 32. 232 in base 31, 1v1 in base 32 (v=31) http://oeis.org/A048268 FACT 16: It's not 2016 Last: 2015, Next: 2018 A calendar. FACT 17: Number of permutations of n elements not containing the consecutive pattern 123 Last: 349, Next: 13,358 http://oeis.org/A049774 CORRECTIONS: - At 1:50 I accidentally say "prime" when I mean "palindrome". First spotted by Oliver Feghali. - I accidentally gave the prime gap after 1327 as the number of non-prime years in-between (33) and not the increase to the next prime (34) like I did for all the others. Sorry, that was me combining two bits of research without thinking! I should have spotted the jarring mismatch of odd and even intervals and realised I was not bring consistent. Pointed out by loads of people, the first of which was TheActualNuttmegger. - The 22 year prime gap ended in the 1970s, not started then (1951 to 1973). Spotted by Scottish Chemist. - For fact 17, it is actually the permutations for n=7, not 8; caught by trigonzobob. The permutation conditions are also more complicated that I managed to explain as well ("without double falls"). Check out http://oeis.org/A049774 - Let me know if you spot anything else. Thanks to my patreon supporters! Here are a few mentioned by name: Sjoerd Wennekes Kragar Daniel Wilson-Nunn Samuel Ytterbrink Everett Chouinard Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Check out Skillshare: http://skl.sh/standupmaths Using the code STANDUPMATHS you can get two months of the premium version for free (which is normally from $8 USD per month). Go straight to the origami star lesson: http://skl.sh/origami-class Download my two colourings of the dodecahedron graph. https://www.dropbox.com/s/x1sn5tqi4ara9ov/dodecoration-three-colour.jpg?dl=0 https://www.dropbox.com/s/3rpsbitya3np1x4/dodecoration-five-colour.jpg?dl=0 The site “What’s on my blackboard?” has a great post on colouring dodecahedra, which I found very useful. https://whatsonmyblackboard.wordpress.com/2011/07/11/colouring-dodecahedra/ Here is the Petersen Graph on wikipedia. https://en.wikipedia.org/wiki/Petersen_graph So far I have been sent ZERO solutions to the “Why those six pentagon edge-colourings” challenge. Watch this space! CORRECTIONS - I sometimes say things like “three colouring” without specifying that I’m talking about colouring the edges, not the vertices (which are the default option). But I hope it is clear from context. - Let me know if you spot any other errors! Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This is Part 2 of 2. Watch the first video: https://youtu.be/8hsZm1BD_j8 If you want to see the Curious Incident of the Dog in the Night-time, in London or on tour, details are here: http://www.curiousonstage.com/ Huge thanks to the National Theatre for giving me access to their sets and staff. And specifically to Bunny Christie, Alan Bain and Adrian Sutton for giving up their time. Thanks to the Further Maths Support Programme for supporting this video. http://furthermaths.org.uk/ We have now finished our run of “The Curious Coincidence of the Maths in Day-time” shows for school students, but we are always doing more Maths Inspiration shows around the UK (and sometimes internationally). http://www.mathsinspiration.com/ I normally have exclusive bonus-footage which is only released to my supporters on Patreon, but because it’s almost christmas I’m going to make the extra treat from this video available to everyone. https://www.youtube.com/watch?v=3moxhmk2w1U Support my videos on Patreon: https://www.patreon.com/standupmaths Filming by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This is Part 1 of 2. Watch the second video: https://youtu.be/shQnyNlgmkc If you want to see the Curious Incident of the Dog in the Night-time, in London or on tour, details are here: http://www.curiousonstage.com/ Huge thanks to the National Theatre for giving me access to their sets and staff. And specifically to Bunny Christie, Alan Bain and Adrian Sutton for giving up their time. Thanks to the Further Maths Support Programme for supporting this video. http://furthermaths.org.uk/ We have now finished our run of “The Curious Coincidence of the Maths in Day-time” shows for school students, but we are always doing more Maths Inspiration shows around the UK (and sometimes internationally). http://www.mathsinspiration.com/ I normally have exclusive bonus-footage which is only released to my supporters on Patreon, but because it’s almost christmas I’m going to make the extra treat from this video available to everyone. https://www.youtube.com/watch?v=3moxhmk2w1U Support my videos on Patreon: https://www.patreon.com/standupmaths Filming by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Behold the 120-sided dice, the d120: http://thedicelab.com/d120.html Of course, the d120 is available on Maths Gear! https://mathsgear.co.uk/products/d120-dice Here is the numerically balanced d20 as well. https://mathsgear.co.uk/products/numerically-balanced-d20 If you’re in the USA, it might be easier to buy direct from the Dice Lab guys via MathArtFun. All of their unique dice are available here: http://www.mathartfun.com/DiceLabDice.html If you’re quick, get one of the free dice from the video! UPDATE: They are all gone! Read the mathematics behind finding the numerically balanced d20: http://oberlin.edu/math/faculty/bosch/nbd_abridged.pdf This is a spreadsheet with the numbers for all 15 different d6 dice. Or the numbers are pasted below. https://www.dropbox.com/s/t03on5cwwmjvysf/d6-layouts.xlsx?dl=0 Here are my previous spherical videos with Henry Segerman: https://www.youtube.com/watch?v=x0gRcRd_rHs https://www.youtube.com/watch?v=Yp12c3-IL-I A NOTE ON NOTATION: I deliberately say “dice” instead of “die”. That’s my personal preference. However, I accidentally flip between “vertex” and “vertices” for the singular of “vertices”. Sorry about that. CORRECTIONS: - The top middle dice in the diagram accidentally has two 5s and no 4. The opposite facing face pairs should be (2,1) (3,6) (4,5). First spotted by Haxxx5, followed by Sam. - Let me know if you spot any more mistakes! THANKS: Thanks to Jared Ro Bear who originally emailed me about spin-down dice. Huge thanks to my Patreon supporters, a subset of which are: Patrick Stover Malcolm Rowe Caitlin Mosca Doug Jones Philippe von Bergen Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/ Numbers on dice Sum around vertices Vertex variance Opp faces sum Opp variance (2,1) (3,4) (5,6) [9,10,10,10,11,11,11,12] 0.75 [3,7,11] 10.67 (2,1) (3,5) (4,6) [8,10,10,9,12,11,11,13] 2.25 [3,8,10] 8.67 (2,1) (3,6) (4,5) [8,11,9,9,12,12,10,13] 2.75 [3,9,9] 8 (3,1) (2,4) (5,6) [8,10,9,10,11,12,11,13] 2.25 [4,6,11] 8.67 (3,1) (2,5) (4,6) [7,10,9,9,12,12,11,14] 4.25 [4,7,10] 6 (3,1) (2,6) (4,5) [7,11,8,9,12,13,10,14] 5.25 [4,8,9] 4.67 (4,1) (2,3) (5,6) [8,9,9,11,10,12,12,13] 2.75 [5,5,11] 8 (4,1) (2,5) (3,6) [6,9,9,9,12,12,12,15] 6.75 [5,7,9] 2.67 (4,1) (2,6) (3,5) [6,10,8,9,12,13,11,15] 7.25 [5,8,8] 2 (5,1) (2,3) (4,6) [7,8,9,11,10,12,13,14] 5.25 [6,5,10] 4.67 (5,1) (2,4) (3,6) [6,8,9,10,11,12,13,15] 7.25 [6,6,9] 2 (5,1) (2,6) (3,4) [6,10,7,10,11,14,11,15] 8.25 [6,8,7] 0.67 (6,1) (2,3) (4,5) [7,8,8,12,9,13,13,14] 6.75 [7,5,9] 2.67 (6,1) (2,4) (3,5) [6,8,8,11,10,13,13,15] 8.25 [7,6,8] 0.67 (6,1) (2,5) (3,4) [6,9,7,11,10,14,12,15] 8.75 [7,7,7] 0

I talk to Hannah Fry and compare our mathematical investigations into playing Monopoly. I’ve put all my probabilities below. You can buy a signed copy of Hannah's book on Maths Gear: https://mathsgear.co.uk/collections/books/products/signed-copy-of-the-indisputable-existence-of-santa-claus In the UK you can also get it from Waterstones: https://www.waterstones.com/book/the-indisputable-existence-of-santa-claus/dr-hannah-fry/dr-hannah-fry/9780857524607 There is a Kindle edition on Amazon: https://www.amazon.com/Indisputable-Existence-Santa-Claus-ebook/dp/B01G96DPWS?_encoding=UTF8&tag=stanupmath-20 You can download all of my monopoly code here: https://www.dropbox.com/s/f5xndyafuj2cmpn/monopoly-v1.py?dl=0 Here are Hannah’s plots: https://www.dropbox.com/s/sme0ezqsb69yg7k/Hannah-monopoly-plots.pdf?dl=0 CORRECTIONS: - I said the game has “finite money” but Chuck Monster has correctly pointed out that the official Monopoly rules state "It [the bank] never runs out of money; if it runs out of bills, players can use any convenient items as substitutes until the bank gets enough money." Support my videos on Patreon: https://www.patreon.com/standupmaths Filming by Trunkman Productions Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/ BEHOLD MY NUMBERS! From 100,000,000 rolls. 00 2.854% - GO 01 2.109% - Old Kent Road/Mediterranean Avenue 02 1.919% - COMMUNITY CHEST 03 2.261% - Whitechapel Road/Baltic Avenue 04 2.404% - Income Tax 05 2.757% - Kings Cross Station/Reading RR 06 2.317% - The Angel Islington/Oriental Avenue 07 1.017% - CHANCE 08 2.308% - Euston Road/Vermont Avenue 09 2.278% - Pentonville Road/Connecticut Avenue 10 6.325% - JAIL 11 2.719% - Pall Mall/St. Charles Place 12 2.61% - Electric Company 13 2.395% - Whitehall/States Avenue 14 2.477% - Northumberland Avenue/Virginia Avenue 15 2.804% - Marylebone Station/Pennsylvania RR 16 2.8% - Bow Street/St. James Place 17 2.62% - COMMUNITY CHEST 18 2.94% - Marlborough Street/Tennessee Avenue 19 3.096% - Vine Street/New York Avenue 20 2.868% - Free Parking 21 2.839% - The Strand/Kentucky Avenue 22 1.212% - CHANCE 23 2.731% - Fleet Street/Indiana Avenue 24 3.197% - Trafalgar Square/Illinois Avenue 25 2.897% - Fenchurch St Station/B&O RR 26 2.719% - Leicester Square/Atlantic Avenue 27 2.689% - Coventry Street/Ventnor Avenue 28 2.821% - Water Works 29 2.601% - Piccadilly/Marvin Gardens 30 0% - GO TO JAIL 31 2.675% - Regent Street/Pacific Avenue 32 2.616% - Oxford Street/North Carolina Avenue 33 1.116% - COMMUNITY CHEST 34 2.494% - Bond Street/Pennsylvania Avenue 35 2.553% - Liverpool Street Station/Short Line 36 2.239% - CHANCE 37 2.085% - Park Lane/Park Place 38 2.086% - Luxury Tax 39 2.552% - Mayfair/Boardwalk

From our Festival of the Spoken Nerd show “Full Frontal Nerdy”. Available here: http://festivalofthespokennerd.com/dvd/ And these places. ITUNES: https://itunes.apple.com/gb/movie/festival-spoken-nerd-full/id1144174820 GOOGLE PLAY: https://play.google.com/store/movies/details/Festival_of_the_Spoken_Nerd_Full_Frontal_Nerdity?id=H5k3yeJESu8 AMAZON VIDEO: http://amzn.to/2cqDrmN Our show in London at the Soho Theatre will be the 11 to 21 January 2017. Full details and tickets: http://www.sohotheatre.com/whats-on/festival-of-the-spoken-nerd Our complete listing of up-and-coming shows: http://festivalofthespokennerd.com/buy-tickets/ CORRECTIONS: - This is a re-upload with the "Slightly Safer For Schools Soundtrack" audio track from the DVD for class use (the censoring is deliberately blatant/badly done). It takes out one naughty word! Support my videos on Patreon: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This is my five-minute talk from the MathsJam Conference 2016. There are monthly Mathsjams as well all around the world, check them out here: http://mathsjam.com/ The seven-colour mug is on Maths Gear: https://mathsgear.co.uk/products/7-colour-torus-mug All seven Letterwise Magic Squares which I found are below, please do let me know if you find any more! Two which sum to 45 and have 21 letters in every direction: 8 19 18 25 15 5 12 11 22 5 22 18 28 15 2 12 8 25 (this is the one with unique letter lengths) Two which sum to 162 and 165 with 27 letters: 44 61 57 67 54 41 51 47 64 45 62 58 68 55 42 52 48 65 Three which sum to 135 with 27 letters: 42 72 21 24 45 66 69 18 48 18 69 48 75 45 15 42 21 72 15 72 48 78 45 12 42 18 75 CORRECTIONS: None yet! Let me know if you spot anything. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

New Rubik’s Cube World Record! 4.74 seconds. I have a chat with Mats Valk about his record-breaking solve. Plus a break-down of how he actually did it. UPDATE: The Valk 3 cube is back in stock on Maths Gear after the original stock sold-out within an hour. https://mathsgear.co.uk/products/the-valk-3x3x3-speed-cube Watch the video on his channel here: https://www.youtube.com/watch?v=tLksISrKtO8 Check out his Facebook: https://www.facebook.com/mats.cubing Thanks the people on r/Cubers for the info on the scramble and solve. https://www.reddit.com/r/Cubers/comments/5bgra2/mats_valk_3x3_wr_474s/ Scramble: B2 F2 D F2 L2 U R2 B2 F2 U2 L2 B' L2 R2 D' U2 L2 U' R' F R Green cross: L' D R2 First pair: R U' R' U' L' U' L Second pair: U2 R U R' U' d' R U R' Third pair: y U2 R U' R' L U' L' Four pair, sort of: y' U2 R' U2 R U2 Last layer: R' U R' F R F' U R Bonus twist: U Support my videos on Patreon and get access to bonus content. In this case: the full 30 minute chat I had with Mats is available to patreon supporters. https://www.patreon.com/standupmaths CORRECTIONS: - People have pointed out (first person was Anurag Lamsal) it is not the fastest solve by a human, just the fastest official solve. There are videos of people solving cubes faster at home. Looking at you, Feliks. - Let me know if you spot anything else! Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

1 smoot = 67 inches = 1.7018 metres Read more about Oliver Smoot: https://alum.mit.edu/news/AlumniNews/Archive/smoots_legacy Google: "speed of light in smoots per second" https://www.google.com/search?q=speed%20of%20light%20in%20smoots%20per%20second Wolfram Alpha: "distance to the sun in smoots" https://www.wolframalpha.com/input/?i=distance+to+the+sun+in+smoots CORRECTIONS: - I accidentally said the speed of light was 1.672 * 10^8 smoots/second when it is actually 1.762, but thankfully the on-screen number is correct. - At 3:30 I say "over 400" when I mean "almost 400", first spotted by Ryan Thom. - Many, many people have pointed-out that I pronounced the Greek letter χ "chi" as 'chai' when it should be 'ki'. I apologise for that, but stand by the way I say ε "epsilon". Support my videos on Patreon and get access to bonus content: https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

I was bored in a hotel room, so I went and bought 72 pencils. You can buy the same pencils on Amazon here: https://www.amazon.com/Staples-Yellow-Pencils-Dozen/dp/B00BQ3ALD6?_encoding=UTF8&tag=stanupmath-20 Download the Stand-up Maths theme! https://standupmaths.bandcamp.com/ George Hart's 72 Pencils: http://www.georgehart.com/sculpture/pencils.html Alejandro Erickson's hexastix instructions: http://alejandroerickson.com/j/2011/09/27/090-how-to-make-hexastix-detailed-photo-instructions.html My show at MoMath in New York on Sunday 23 October: https://in.momath.org/civicrm/event/info?reset=1&id=744 This video is in no way sponsored by Staples. If anything, they're probably slightly annoyed at me for messing around in their fancy office chairs. CORRECTIONS: None yet. Let me know if you spot anything. Support my videos on Patreon! https://www.patreon.com/standupmaths Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

I look at the historical quirks which gave us TV at 29.97 frames per second. In North America at least. It's a comfortable 25 fps in Europe. More on that thing I mentioned at the end of the video here: https://www.patreon.com/standupmaths Here is the spherical video I was making with Henry Segerman which made me research NTSC frame rates in the first place: https://www.youtube.com/watch?v=Yp12c3-IL-I Yes, technically, if you divide 4,500,000 by 286 you get a horizontal frequency of 15,734.26573 lines per second. That matches a frame rate of 29.97002997002997… and so old TVs used 30/1.001 = 29.97002997002997… CORRECTIONS: - A lot of people pointing out that increasing the number of horizontal lines without increasing the bandwidth would be a loss of resolution. Which is a good point. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Patreon: https://www.patreon.com/standupmaths Nerdy maths toys: http://mathsgear.co.uk/

Get involved with the Manchester Mega Pixel! http://www.manchestermegapixel.com/ Come and join-in at the Museum of Science and Industry during the Manchester Science Festival: 20 to 30 October 2016. http://www.manchestersciencefestival.com/event/manchester-megapixel/ If you want to volunteer to help out behind the scenes and be part of the official team, send us an email: [email protected] Here is the original Spreadsheets video: https://www.youtube.com/watch?v=UBX2QQHlQ_I Download the net to make your own colour-space cube: http://privatewww.essex.ac.uk/~sjs/research/rgb_net.html Katie’s youtube channel: https://www.youtube.com/user/st3cks Huge thanks to our supporters on the Mega Pixel project: Manchester Science Festival Museum of Science and Industry Edding International BIG: STEM Communications Network University of Salford Think Maths Also thanks to Samantha Durbin for finding us a backstage room to film in when Katie should have been giving a talk. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Four is the only number in the English language which as as many letters as its value. Leave your findings below and please do comment (constructively!) on the findings of others. Here is the python code I used to track which binary sequences ended in 13 and 18: https://www.dropbox.com/s/j40jc15u0krvrb2/binarychain.py?dl=0 145 and the Melancoil - Numberphile https://www.youtube.com/watch?v=_DpzAvb3Vk4 Geometry of Footballs and the Cube-shaped Ball https://www.youtube.com/watch?v=cwWBpjeyRS0 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Matt and Hugh play with an Euler Disk which spins forever. Then they do some working out to check Matt’s previous calculations. Matt’s previous video: The Maths of Spinning Coins and Euler's Disk https://www.youtube.com/watch?v=8pSLffliCk0 Sadly we don’t have Euler Disks on Maths Gear but it is of course on Amazon: https://www.amazon.com/Toysmith-791709-Eulers-Disk/dp/B000239E6Q/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 Dr Hugh Hunt is a Senior Lecturer in Engineering at the University of Cambridge and a Fellow of Trinity College. http://www.hughhunt.co.uk/ This is a new video format idea, so all feedback appreciated. CORRECTIONS: So far, none yet! Let me know if you spot anything. Piano music is an original piece “The River” by Frode-5. https://www.youtube.com/watch?v=XVbFCmFVecE All other music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Behold the Rhombic Triacontahedron which links these two recent videos: A new Rhombic Dodecahedron from Croatia! https://www.youtube.com/watch?v=xVBOlbjiHGI The Best Square Square in New York https://www.youtube.com/watch?v=yfR1Jkl5R8A Rhombic Triacontahedron on Mathworld: http://mathworld.wolfram.com/RhombicTriacontahedron.html Here is the Exploded Rhombic Triacontahedron on Mike Deakin’s Shapeways page: http://shpws.me/MhDT I mentioned An Evening of Unnecessary Detail, a comedy show I do in London sometimes: http://aneveningofunnecessarydetail.com/ In New York I was working with MoMath: http://momath.org/ Watch Mathologer’s video: How not to Die Hard with Math https://www.youtube.com/watch?v=0Oef3MHYEC0 And, I guess, you could watch Die Hard with a Vengeance… https://www.amazon.com/Die-Hard-Vengeance-Bruce-Willis/dp/B001FVD65O/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 CORRECTIONS: So far, none yet! Let me know if you spot anything. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Listen to the hot tea episode of Domestic Science here: http://www.bbc.co.uk/programmes/b07m7lmr Full data footage is over here on my second channel: https://www.youtube.com/watch?v=-kZYxQpy3Ek Stefan-Boltzmann Law http://hyperphysics.phy-astr.gsu.edu/hbase/thermo/stefan.html The thermometer I used was the Signstek 6802 II, the cheapest dual channel thermometer I could find. But it turns out it is only $16.99 in the USA right now: https://www.amazon.com/Signstek-Channel-Digital-Thermometer-Thermocouple/dp/B00FFYEPVQ/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 Whereas I paid £14.29 in the UK: https://www.amazon.co.uk/Signstek-Channel-Digital-Thermometer-Thermocouple/dp/B00HA22XEC?_encoding=UTF8&tag=stanupmath-20 If you’re in the market for one, I have a second-hand only-slightly-tea-stained one available. CORRECTIONS: - According to comments, it seems no one else in the world puts milk in their tea. - Several people have pointed out that there was not an equal amount of hot water in each mug which would affect cooling rates (the first of which was HueBearSong, who also seemed to be the most disinterested). Is that enough of a difference to justify me doing it again? Comment below! - As pointed out by user HYEOL, the teaspoon was cold going in to T2 but hot when going in to T1. Which yes, would make a difference. Turns out science is hard. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Huge thanks to the Great Courses Plus for sponsoring this video. Click here to check out the free trial: http://ow.ly/gSm4302OFJw Watch the full integration! Worth it even just for the Simple Harmonic Motion which drops out at the end. https://www.youtube.com/watch?v=uUkCI1M6h_8 Try the ISS challenge! Will you get there before the after the International Space Station orbits half-way around the planet? Even if you don’t try to work it out, you can have a guess at the outcome. https://www.youtube.com/watch?v=Y64IHy1MGRQ Python code that I used is here: https://www.dropbox.com/s/vbwymdxjz47bsrs/Earth_fall.py?dl=0 My values: R = 6,371,000 m (radius of the Earth) G = 6.674 × 10^-11 m^3 kg^-1 s^-2 (gravitational constant) M = 5.972 × 10^24 kg (mass of Earth) Yes, people have since pointed out a similar topic was covered in a Minute Physics video. They skip over the "constant stuff" and how the mathematics is derived, but it’s a great look at how the density changes within the Earth and how that impacts the travel time. Well worth checking out as well. https://www.youtube.com/watch?v=urQCmMiHKQk CORRECTIONS: - I accidentally wrote "v" instead "s" on the board in "s = ut + ½at^2". First spotted by Joel Low. - Around 9:30 I used a dot for both 1,000's and decimal point. The first should be a comma. Spotted by Mezgrman. - I normally play pretty fast and loose with centripetal force vs centrifugal effect; I think arguing about the difference is not useful so I often use them as synonyms. In this case, as Wayne Ernst politely pointed out, I should have said "centripetal force" not "centrifugal force". And they're right. Discuss on reddit: https://www.reddit.com/r/mattparker Music by Howard Carter Design by Simon Wright Apple wrangling by Lucie Green MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Download the podcast of my BBC Radio4 show, Domestic Science (Ep1) http://www.bbc.co.uk/programmes/p02pc9x6/episodes/downloads In this video I start with how many 256×256 greyscale images are possible and work my way up to the maximum number of possible YouTube videos. Original question on twitter: https://twitter.com/dedwarmo/status/755799688759037953 Here is our radio show on the BBC radio player. Let me know if it does not work for you. http://www.bbc.co.uk/programmes/b07lxqq8/episodes/player Our Festival of the Spoken Nerd DVD and download: https://shop.festivalofthespokennerd.com/ Galaxy M81 image credit: NASA/JPL-Caltech/ESA/Harvard-Smithsonian CfA Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Make your own cube football! https://www.dropbox.com/s/idtkss3bpedl6st/cube-football-shape.png?dl=0 If you want the net for the hilarious "perimeter league" ball I made, here it is: https://www.dropbox.com/s/561q7hiljt0ht8g/perimeter-football-net.pdf?dl=0 This is the exact premier league ball that I bought: https://www.amazon.co.uk/Nike-Pitch-PL-Football-multi-coloured/dp/B012T9XTMA?_encoding=UTF8&tag=stanupmath-20 Here is the same ball on the US Amazon, but they don’t have that exact colour scheme: https://www.amazon.com/dp/B00VRJSRJE/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The icosahedral dice I show is a generic spin-down dice I happen to have on my desk. The dodecahedral dice is one of the Maths Gear "Go First" dice: https://mathsgear.co.uk/products/go-first-dice 1966 football photo by Ben Sutherland, 2009. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

If you do find other triangle-square numbers, and/or a pattern behind them, do label any spoilers in the comments carefully. And don't just look them up! Sorry this is such a quick video. True story: I've been waiting for government paperwork so I can put a different video up, but the wait has gone on too long. This should tide us all over for a bit. Other mysterious video along soon! I'll do a solution video to this one sooner or later. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Watch previous video about viewing spherical footage: https://youtu.be/x0gRcRd_rHs Check out the site for Henry’s book, it has loads of interactive 3D models and stuff you can 3D print: http://www.3dprintmath.com/ BOOK ON US AMAZON https://www.amazon.com/Visualizing-Mathematics-Printing-Henry-Segerman/dp/142142035X?_encoding=UTF8&tag=stanupmath-20 BOOK ON UK AMAZON https://www.amazon.co.uk/Visualizing-Mathematics-Printing-Henry-Segerman/dp/142142035X/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The Segerman channel: https://www.youtube.com/user/henryseg Some early flat work of Henry’s on Escher and the twisted droste effect: http://www.segerman.org/printgallery/ Henry’s paper with Saul Schleimer also contains details on the mathematics behind these transformations. http://arxiv.org/abs/1605.01396 Here is the camera Henry uses, the “Ricoh Theta S”. https://theta360.com/ CAMERA ON US AMAZON https://www.amazon.com/Ricoh-Theta-Digital-Camera-Black/dp/B014US3FQI/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 CAMERA ON UK AMAZON https://www.amazon.co.uk/Ricoh-Theta-S-Camera-Black/dp/B014US3FQI?_encoding=UTF8&tag=stanupmath-20 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Watch in spherical video! https://www.youtube.com/watch?v=WHncaEJVZco Check out the site for Henry’s book, it has loads of interactive 3D models and stuff you can 3D print: http://www.3dprintmath.com/ BOOK ON US AMAZON https://www.amazon.com/Visualizing-Mathematics-Printing-Henry-Segerman/dp/142142035X?_encoding=UTF8&tag=stanupmath-20 BOOK ON UK AMAZON https://www.amazon.co.uk/Visualizing-Mathematics-Printing-Henry-Segerman/dp/142142035X/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 The Segerman channel: https://www.youtube.com/user/henryseg Henry’s Shapeways page. You might want to get your bankcard out while you’re clicking to save some time. So may cool things. http://www.shapeways.com/shops/henryseg Here is the camera Henry uses, the “Ricoh Theta S”. https://theta360.com/ CAMERA ON US AMAZON https://www.amazon.com/Ricoh-Theta-Digital-Camera-Black/dp/B014US3FQI/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 CAMERA ON UK AMAZON https://www.amazon.co.uk/Ricoh-Theta-S-Camera-Black/dp/B014US3FQI?_encoding=UTF8&tag=stanupmath-20 Henry also wrote a paper with Saul Schleimer “Squares that Look Round: Transforming Spherical Images” which contains all the details you need. http://arxiv.org/abs/1605.01396 Finally, here is Henry Segerman on Github, but if you’re the kind of person who has any interest of looking at his code on Github then you can find it with about five seconds of googling so I don’t know why I’m even providing this link: https://github.com/henryseg Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

WATCH ALL 939 FLIPS: https://www.youtube.com/watch?v=917VgVGVkpc The original ten flip video is here: https://www.youtube.com/watch?v=aHU-L3BLd_w If you want a free card or balloon section, buy something off Maths Gear and make a note when you check out: https://mathsgear.co.uk/ Or if there is nothing you want, just pay for the shipping and I’ll post you a thing: https://mathsgear.co.uk/products/id-like-a-thing-please Here is my book as well: https://mathsgear.co.uk/collections/books/products/signed-paperback-things-to-make-and-do-in-the-fourth-dimension 938 Caroline Caruana Educational Klemens Edler Wessel van persie Bjørn-Inge Flølo Kleppe 937 Chance Stokes Deathvader10 Brandon Allaire Owen Ball 936 EightByte siili 123 Phalax Daniel 942 Jaycycle Oleksiy Bazhenov Olaf de Graaff Henry Burkle Baadrix SC94khvids ReCaptcha Heinz Paul O'Malley Kenneth Ramberg Fjærestad Download the spreadsheet with the flips and guesses: https://www.dropbox.com/s/sy6qlg688xovzvz/flips-guesses.xlsx?dl=0 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Can you believe that many so-called "squares" in New York are actually triangles‽ I hunt down the square most deserving of its name. Times Square 40.7605364,-73.9881165 Triangle Greeley Square 40.7475166,-73.9902623 Triangle Madison Square 40.7417129,-73.9866145 Rectangle Union Square 40.7362828,-73.9934595 Rectangle Stuyvesant Square 40.7334896,-73.9846672 Square Washington Square 40.730503,-73.9959379 Rectangle Cooper Square 40.7274296,-73.9929123 Trapezium Tompkins Square 40.7268115,-73.9832778 Square Peretz Square 40.7226714,-73.9878349 Triangle Foley Square 40.7152103,-74.001972 A thing? Straus Square 40.7147475,-73.9910052 Triangle Kimlau Square 40.7140132,-73.9990492 Rectangle Coleman Square 40.712846,-73.9964231 Trapezium Hanover Square 40.7047231,-74.0104991 Triangle My previous New York math video: https://www.youtube.com/watch?v=Quwvw0vYkRA Check out 99% Invisible: http://99percentinvisible.org/episode/holdout/ The Hess Triangle on Wikipedia: https://en.wikipedia.org/wiki/Hess_triangle Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Behold the Bilinski Rhombic Dodecahedron I found in Croatia. Stanko Bilinski does not have much of a wikipedia page. https://en.wikipedia.org/wiki/Stanko_Bilinski The best online version of his dodecahedron. http://dmccooey.com/polyhedra/BilinskiDodecahedron.html My video on the 4D Rhombic Dodecahedron. https://www.youtube.com/watch?v=oJ7uOj2LRso Rhombic Dodecahedron http://mathworld.wolfram.com/RhombicDodecahedron.html Rhombic Icosahedron http://mathworld.wolfram.com/RhombicIcosahedron.html Rhombic Triacontahedron http://mathworld.wolfram.com/RhombicTriacontahedron.html Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This video contains a lot of solutions and a lot of dice. Original puzzle suggested by Lucas Garron. Dice are: ALL GONE Matt’s online mathematical toys store. http://mathsgear.co.uk/ My favourite solution was: Hagen von Eitzen geometric solution. https://www.youtube.com/watch?v=vRSkHaDhM7s Download the Three Dice Hexagon Rolling Guide. https://www.dropbox.com/s/dalyidbnzrl3tae/standupmaths-dice-hexagon.pdf?dl=0 Original Three Indistinguishable Dice Puzzle video. https://www.youtube.com/watch?v=xHh0ui5mi_E Discussion on reddit /r/math https://www.reddit.com/r/math/comments/4eltj8/ Discussion on the /r/mattparker subreddit. https://www.reddit.com/r/MattParker/comments/4ek9ow/ Matt Stuart response video. https://www.youtube.com/watch?v=dz3cu9T3fSE MrBoxinaboxinabox and Alex youtube comments. https://www.youtube.com/watch?v=xHh0ui5mi_E&lc=z13rh15gikejh5htd233tf2rerfxu1pgh04 Tarim, solution in a tweet. https://twitter.com/tarim8/status/719939463707803649 Katie and Paul's "dead easy" solution. https://www.youtube.com/watch?v=Hfw8bB82-ps Marty Wollner video (3 of 3). https://www.youtube.com/watch?v=o4bFVn0VP_E Marty Wollner long description. http://spikersystems.com/FlashNet_Pointer/www/downloads/SpikerSystems/P1_Demo_Demo/SpikerSystems_Patent.htm Marty Wollner patent. https://www.google.com/patents/US8246446 mathAHA closed formula. https://www.youtube.com/watch?v=zOI52Fr2mG8 Jan Van Lent python code. https://www.dropbox.com/s/cnqh59oq0mglehe/threetotwodice.py?dl=0 CORRECTIONS: The individual dice values do matter in Monopoly as you roll again on a double. First noticed by Suzie Brown. I though that was a 'house rule' but it's an official rule. You also can roll a double to escape jail. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Colm Mulcahy’s Mathematical Card Magic: Fifty-Two New Effects US AMAZON http://www.amazon.com/Mathematical-Card-Magic-Fifty-Two-Effects/dp/1466509767?_encoding=UTF8&tag=stanupmath-20 UK AMAZON https://www.amazon.co.uk/Mathematical-Card-Magic-Fifty-Two-Effects/dp/1466509767/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 What's in side the spherical dice? Stay tuned (as such). CORRECTIONS: Yes, I accidentally said "eight" instead of "four". I caught it just in time during the edit to put in a text correction, but not soon enough to be able to re-film it. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Some things you probably did not know about 1729 and the Man Who Knew Infinity. Scan of page from Ramanujan’s Lost Notebook http://i.imgur.com/xsfXHUz.jpg Fermat’s Last Theorem by Simon Singh: https://www.amazon.co.uk/Fermats-Last-Theorem-Confounded-Greatest/dp/1841157910/ref=sr_1_1?_encoding=UTF8&tag=stanupmath-21 PDF of the first lecture from Ramanujan: Twelve Lectures on Subjects Suggested by His Life and Work https://dl.dropboxusercontent.com/u/50166092/Ramanujan%20-%20G%20H%20Hardy%20-%201940.pdf Imgur album: http://imgur.com/a/KJOuV Plus magazine “Ramanujan surprises again” https://plus.maths.org/content/ramanujan “The 1729 K3 Surface” by Ken Ono and Sarah Trebat-Leder http://arxiv.org/abs/1510.00735 Generating Function -- from Wolfram MathWorld http://mathworld.wolfram.com/GeneratingFunction.html The Man Who Knew Infinity Official Trailer #1 https://www.youtube.com/watch?v=oXGm9Vlfx4w Fermat's Last Theorem - Numberphile https://www.youtube.com/watch?v=qiNcEguuFSA Partitions - Numberphile https://www.youtube.com/watch?v=NjCIq58rZ8I James Grime: Knowing The Man Who Knew Infinity https://www.youtube.com/watch?v=HMGZVKwYNfk Mathologer: Making sense of 1+2+3+... = -1/12 and Co. https://www.youtube.com/watch?v=jcKRGpMiVTw Matt and Hugh play with a thing and then do some working out https://www.youtube.com/watch?v=Q8b9r7forJA Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Matt and Hugh play with a tennis ball and a brick. Then they do some working out to derive the formula for the centripetal force (a = v^2/r) by differentiating some vectors. Here are the sheet of working out: http://imgur.com/a/lphOr Dr Hugh Hunt is a Senior Lecturer in Engineering at the University of Cambridge and a Fellow of Trinity College. http://www.hughhunt.co.uk/ https://www.youtube.com/user/spinfun This is a new video format idea, so all feedback appreciated! (Sorry the audio goes a bit out-of-phase; fixing it for this video was beyond my current skill × time, but I'll fix it next time.) Piano music is an original piece “The River” by Frode-5. https://www.youtube.com/watch?v=XVbFCmFVecE All other music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Can you find a way to squeeze two dice out of three? SOLUTION VIDEO: https://www.youtube.com/watch?v=hBBftD7gq7Y Problem suggested to me by Lucas Garron. Thanks to extra work done by Josh Laison, Jan Van Lent and Tarim (which convinced me it would work as a puzzle). CORRECTIONS: - Actually, more of a clarification. In the first bit I was using a remainder of 0 as 6, according to the convention that n = 0, mod n. But I forgot to mention it explicitly. Sorry! First noticed by DeadLink. Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

MegaMenger project: http://megamenger.com/ Ed Pegg's article "Squeezing Pi from a Menger Sponge" http://community.wolfram.com/groups/-/m/t/822984 Mega Menger: Building a Menger Sponge at MIT https://www.youtube.com/watch?v=YpmP8OJJ7W4 Watch Matt calculate pi with... pies: https://www.youtube.com/watch?v=ZNiRzZ66YN0 a pi-endulum: https://www.youtube.com/watch?v=qYAdXm69l8g a lot of chalk: https://www.youtube.com/watch?v=HrRMnzANHHs CORRECTIONS: - A comment by Starkiller Base pointed out that at the end, I need eight of the Wallis Sponges stacked in a cube. As each one is a unit side, that gives the 'radius' of 1. A single sponge is one eighth of the volume of the unit sphere. - Jon Mound (@ChthonicJon on Twitter) first spotted that 63/64 should not have been there. I accidentally animated a slip of the tongue. Product should be: 8/9 × 24/25 × 48/49 × 80/81 × 120/121 … (Also spotted in the comments by pjrkearsley87 & hweigel528.) - Meta-correction: SithBowman noticed I had "132" instead of "121" in the above correction. The correction has since been correctly corrected. Sorry everyone! Two mistakes and counting. I was really pushed for time this week, which is why some animations are a bit lazy and it's so late in the week (also, so many errors). Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

This is my celebration video for hitting 100,000 subscribers: I flip a coin accurately ten times in a row. Using a FIFA Football "Referee Flip Coin" I get a perfect run of H, T, H, T, H, T, H, T, H, T. The videos shows just those ten flips. Put your guess for how many times you think I actually flipped the coin in the comments below, and the ten closest guesses will win a prize. Competition ends ten days after the video was published. Watch James Grimes flip ten heads (laaaame) here: https://www.youtube.com/watch?v=_K585ODq0a0 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

A spinning coin rotates as it wobbles. The rate of rotation is (1/cos(θ) - 1) of the rate of wobble. Draw an arrow on a coin and check it yourself! The notes from the whiteboard are available here: http://imgur.com/a/XVw6m Here are the videos of the disk spinning: NORMAL SPEED: https://youtu.be/dmo0whbDiGQ 10% SPEED: https://youtu.be/2Kk0KMQeRCk Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

For Pi Day 2016 I tried to calculate π by hand, using an infinite series. It goes ok. Before you even start: - Yes, I know π Day requites writing the date MM/DD. By objective measures: the wrong way. I don't care. My love of π is stronger. - My opinion of Tau is a matter of public record: http://youtu.be/ZPv1UV0rD8U CORRECTIONS: - At 17:23 it should be π/4 not 1/π. That was contamination from the next graphic. (First spotted by Najeeb Sheikh and Jake Trookman.) Check out y-cruncher: http://www.numberworld.org/y-cruncher/internals/formulas.html Calculating pi by weighing a circle: https://www.youtube.com/watch?v=Ngj0a57Rlb0 Calculating pi with a pendulum: https://www.youtube.com/watch?v=qYAdXm69l8g Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

While in Norway doing some maths shows I was given a tshirt and a puzzle. Both are very mathematical. If you have not tried a "Prisoners in Hats Puzzle" before, I explain the basic version. If you have seen it before, I also give a variation which I had not come across previously. Give it a go! MathsJam: http://mathsjam.com/ Math-Jam: http://math-jam.com/ If you want to discuss this puzzle somewhere more comfortable, it seems I have a fledgling subreddit: https://www.reddit.com/r/MattParker/ Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Behold the one true parabola! All parabolas are exactly the same, just zoomed in and out. Copy of the lecture notes: http://imgur.com/a/OjvYo Original paraboloids video: https://www.youtube.com/watch?v=owVwjr6pTqc Fledgling subreddit: https://www.reddit.com/r/MattParker/ Music by Howard Carter Design by Simon Wright Additional music: Every Voice by Jimmy Fontanez Church Bell Celebration by Doug Maxwell MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Get an Easter Egg. Spin it. End of trick. Yes, it is spelled "tippe top". They can already be bought super-cheap online, which is why we don't have them on Maths Gear. If you want to take a closer look at "Spinning Tops" by John Perry, I have uploaded photos to imgur: http://imgur.com/a/sw0pc It's also on Project Gutenberg: http://www.gutenberg.org/ebooks/34268 If you want to discuss this video somewhere more comfortable, it seems I have a fledgling subreddit: https://www.reddit.com/r/MattParker/ Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

2016 is a leap year because it is a multiple of 4 (and not a multiple of 100). The Gregorian Calendar system of leap years gives an average tropical year of 365.2425 days compared to the current true value of 365.2421891, but I think we can do better. Yes, at the 1:20-ish point it should be "365.2421891 days" as is on the screen, not the "365.2521891 years" I say. Sorry, it's been a busy week and I recored and edited the video a bit too quickly to spot Past Matt's mistakes. Read Adam Goucher's article here: https://cp4space.wordpress.com/2012/09/12/lunisolar-calendars/ Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

The building in London at 20 Fenchurch Street started to set things on fire! But it could have been worse. I use a paraboloid to set other things on fire. Oh, and there's a maths proof. News stories about the concave building: http://www.dailymail.co.uk/news/article-2786723/London-skyscraper-Walkie-Talkie-melted-cars-reflecting-sunlight-fitted-shading.html http://www.bbc.co.uk/news/uk-england-london-23930675 http://www.independent.co.uk/news/uk/home-news/walkie-talkie-skyscraper-to-be-fitted-with-permanent-sunshade-after-it-melted-cars-9379037.html Festival of the Spoken Nerd: http://festivalofthespokennerd.com/ Play with the Geogebra parabola demonstration: http://www.geogebra.org/material/show/id/189498 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Here it is, all the maths and logic behind the Mind-Boggling Card Trick. Watch the original card trick here: https://www.youtube.com/watch?v=aNpGxZ_1KXU The earliest record I can find of the same dealing mechanic being used is by magician Karl Fulves. The swapping cards bit was added by magician (and computer science professor!) Peter McOwan. I actually wrote a maths magic book with Peter, you can download it for free. http://mathematicalmagic.com/ Here is the Vsauce Math Magic video I mentioned and was mentioned in: https://www.youtube.com/watch?v=ObiqJzfyACM Saturday Morning Breakfast Cereal comic about a science magician for which Zach used me to generate a pseudo-random name: http://smbc-comics.com/index.php?id=4002 Everyone should go to a BAHfest: http://www.bahfest.com/ Response videos by PappaMoe and Juan Meleiro: https://www.youtube.com/watch?v=i3Cd1lRAAdM https://www.youtube.com/watch?v=2QKcaYbPjo4 The 27-card and 49-card tricks: https://www.youtube.com/watch?v=l7lP9y7Bb5g https://www.youtube.com/watch?v=G_OuIVOGDr8 Prepare your mind to be boggled. This is an incredible card trick which is completely self-working. This trick relies only on the mathematical properties of a deck of cards. I will put up a complete solution video explaining the mechanics behind the trick soon! Want your own distorted skew dice like I used in the video? They're here: http://mathsgear.co.uk/collections/di... MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

Cutting a möbius loop in half is fun. Sticking two möbius loops together and cutting them both in half is romantic. Much more on möbius loops and topology in my book Things to Make and Do in the Fourth Dimension: http://mathsgear.co.uk/collections/books/products/signed-paperback-things-to-make-and-do-in-the-fourth-dimension Also on Maths Gear is the Cos I Love You card: http://mathsgear.co.uk/products/cos-i-love-you-card Think Maths parametric heart coordinates resources: http://think-maths.co.uk/downloads/parametric-heart-spreadsheet And here is my Royal Institution lecture: https://www.youtube.com/watch?v=1wAaI_6b9JE MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

Prepare your mind to be boggled. This is an incredible card trick which is completely self-working. This trick relies only on the mathematical properties of a deck of cards. I will put up a complete solution video explaining the mechanics behind the trick soon! Want your own distorted skew dice like I used in the video? They're here: http://mathsgear.co.uk/collections/dice/products/skew-dice MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

Buy a modern version of Dr NIM! https://mathsgear.co.uk/products/braino The game of (single pile) Nim can be won by anyone who understands a simple trick. A trick so easy, a 1960s mechanical plastic computer can play with perfect strategy, defeating all humans. Learn the method and proceed to beat your friends, family and colleagues. Read more about single-pile Nim on the Maths Busking site: http://www.mathsbusking.com/shows-twenty-quid.html My Domino Computer. The Domputer. http://youtu.be/OpLU__bhu2w Dr NIM at the Computer History Museum: http://www.computerhistory.org/collections/catalog/102688881 And someone has put the whole instruction booklet online: http://www.cs.miami.edu/home/burt/learning/Csc427.152/491_Dr-Nim-Manual5b15d.pdf MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

2^74,207,281 - 1 is prime and it is the biggest prime humans have ever found. Behold all 22,338,618 digits.* Official announcement of our new prime friend: http://www.mersenne.org/primes/?press=M74207281 Join the Great Internet Mersenne Prime Search here: http://www.mersenne.org/ More on Curtis Cooper and the University of Central Missouri: http://cs.ucmo.edu/~cnc8851/ Read about the Intel Skylake bug found with Prime95: http://arstechnica.com/gadgets/2016/01/intel-skylake-bug-causes-pcs-to-freeze-during-complex-workloads/ Biggest primes known to humankind: http://primes.utm.edu/largest.html MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright *video does not contain all 22,338,618 digits.

Proof that Australian bank notes are the best in the world because they are sized according to a log scale. Also, they are water-proof. I compare Australian, Canadian, UK and USA bank notes in an unbiased competition to see which is the best. My dual criteria are: - the closest log-scale fit between the value and physical object for each note - able to survive a being left in pocket and going through the wash If you disagree: cast your vote now! If you think I have missed an even better currency: I accept bribes in whatever the currency may be. Also, check out my mate Steve Mould: https://www.youtube.com/user/steventhebrave https://www.youtube.com/watch?v=iMGvTYDC5MA MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

A puzzle to work out the perimeter of a shape (NO SPOILERS!) complete with an introduction to hash functions. DO NOT put your answer tot he puzzle in the comments below. If you want to check your answer, repeatedly take the square-root five times and if the first six non-zero digits after the decimal point are 234477 (in numerical order) then you are correct. Or check your answer using the SHA-256 hash function: http://hash.online-convert.com/sha256-generator Watch James on Numberphile talk about √2 and A4: https://www.youtube.com/watch?v=5sKah3pJnHI Watch me apologise for making fun of Imperial units: https://www.youtube.com/watch?v=r7x-RGfd0Yk MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

Can you solve James Grime’s self descriptive number puzzle and explain how you worked it out? https://www.youtube.com/watch?v=K6Qc4oK_HqY Answers with thought-processes below in the comments. James's solution video is now up! Complete with special guests… http://youtu.be/1GKfEDvhWdY

Matt Parker’s comedy routine about spreadsheets. From the Festival of the Spoken Nerd DVD: Full Frontal Nerdity Buy Full Frontal Nerdity as a DVD or Download: http://shop.festivalofthespokennerd.com/ See where Festival of the Spoken Nerd are performing live: http://festivalofthespokennerd.com/buy-tickets/ Convert your own image spreadsheet! http://think-maths.co.uk/spreadsheet Buy Matt’s book! http://makeanddo4d.com/ Think Maths: mathematics talks, workshops and free resources http://think-maths.co.uk/ MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright Programming by Andrew Taylor

The complete guide to making a scientifically accurate, mathematically precise snowflake from a single piece of paper (any ratio). Warning: may contain rant.

This is a Matt Explains video. Still very much a work in progress. All feedback hugely appreciated. Sorry about the strobing camera focus on the whiteboard! I seem to be in focus this time, but at the cost of my camera freaking-out over the board. I might need a new camera. Or a camera person. Whichever is cheaper. Read all about the Binomial Theorem at MathWorld: http://mathworld.wolfram.com/BinomialTheorem.html

Forget about platform 9¾, London King's Cross Station has a platform 0. Thanks to everyone at Raspberry Pi for accommodating me at such short notice! PI ZERO: https://www.raspberrypi.org/products/pi-zero/ PYGAME ZERO: https://pygame-zero.readthedocs.org/ GPIO ZERO: http://pythonhosted.org/gpiozero/ Huge thanks to everyone who suggested zero-related products. You can find some of the key tweets below to see how my day panned out. Innocent tweet about getting a coffee: https://twitter.com/standupmaths/status/673831685402791937 Request that started it all: https://twitter.com/standupmaths/status/673833768940097536 Me begging for a Pi Zero: https://twitter.com/standupmaths/status/673837497026224128 Ben coming through with the goods: https://twitter.com/ben_nuttall/status/673844429254361088 I was in Cambridge to do a Maths Inspiration event for school students. We also run Maths Fest. Teachers, check them out: http://mathsinspiration.com/ http://maths-fest.com/ If you are ever on Platform 0 be sure to send me a photo!

Meet the Hyper-Diamond! It's the sixth Platonic Solid and it only works in the fourth dimension. Your best google bet to find more about the hyper-diamond is "24-cell". http://mathworld.wolfram.com/24-Cell.html Watch my Royal Institution lecture about 4D shapes: https://www.youtube.com/watch?v=1wAaI_6b9JE My book: http://makeanddo4d.com/ Maths Gear: http://mathsgear.co.uk/ 4D animations made with Stella4D: http://www.software3d.com/Stella.php MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Music by Howard Carter Design by Simon Wright

The Thue-Morse Sequence is the fairest way to share things between two people. It also does all sorts of other crazy stuff. Plus it is the solution to my previous video: https://www.youtube.com/watch?v=E5-pgBnGyzw Check out MathsJam: http://mathsjam.com/ You can also buy Rob Eastaway's books: http://mathsgear.co.uk/collections/frontpage/products/signed-copy-of-why-do-busses-come-in-threes And here is more Thue-Morse than you will probably ever need: ABBABAABBAABABBABAABABBAABBABAABBAABABBAABBABAABABBABAABBAABABBABAABABBAABBABAABABBABAABBAABABBAABBABAABBAABABBABAABABBAABBABAABBAABABBAABBABAABABBABAABBAABABBAABBABAABBAABABBABAABABBAABBABAABABBABAABBAABABBABAABABBAABBABAABBAABABBAABBABAABABBABAABBAABABBA

Can you split the numbers 0 to 31 into two groups so that the sum of their 1st, 2nd, 3rd and 4th powers are all equal? Answer soon!

This is a Disco Calculator designed and made by Sam Headleand to pass all of my 'calculator unboxing' tests. Watch me unbox calculators: https://www.youtube.com/watch?v=wyl-V0mrEio&list=PLt5AfwLFPxWKAINNfxIdYmFVKuk_F_cQq I interviewed Sam at the MathsJam Weekend 2015: http://mathsjam.com/ Sam is hugely appreciative of the facilities at Fab Lab Manchester: http://manchesterfablab.manufacturinginstitute.co.uk/ You can buy a normal Disco Calculator at Maths Gear. http://mathsgear.co.uk/products/disco-calculator Divide and conga. MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/ Music by Howard Carter Design by Simon Wright

A video which may or may not be interesting! I'm trying a new "Matt Explains" format because I had a great comment on my "How to get infinitely many lottery tickets" video and I wanted to look at it in detail. I may or may not do this again. Feedback appreciated! How to get infinitely many lottery tickets: https://www.youtube.com/watch?v=pOx_daJT_8c Read all about the Geometric Series at MathWorld: http://mathworld.wolfram.com/GeometricSeries.html

STREET = 9.975 × AVENUE - 26.5 While in New York City I walked along Broadway with graph paper and plotted where it crosses the street and avenues. Most of Manhattan is horizontal streets and vertical avenues, but the road Broadway cuts across on an angle. Using the grid system of roads in NYC I could calculate the liner equation of Broadway. I had some fun with places like Union Square and the Flatiron Building along the way. You can also check-out when MoMath checked the pythagorasness of the Flatiron Building here: http://momath.org/home/pythagorize-the-flatiron/ Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ Maths book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

How to prove that the roots of two are irrational using Fermat's Last Theory and that there are infinitely many primes using the Green-Tao theorem. Yes, yes: Green and Tao took it as a given that there are infinitely many prime numbers and my pithy proof may very well be circular! If you wish to check, they're paper is here: http://annals.math.princeton.edu/wp-content/uploads/annals-v167-n2-p03.pdf Actually, the point has been raised that even the Andrew Wiles proof of Fermat must contain the assumption that 2 is irrational, or something equivalent. If anyone can email me an Atomic Mosquito proof ( [email protected] ) which does not contain any circular logic, I'll do a follow-up video. This is PrimeGrid: http://www.primegrid.com/ If you missed them, here are the 26 primes which are all 5,283,234,035,979,900 apart: 43142746595714191 48425980631694091 53709214667673991 58992448703653891 64275682739633791 69558916775613691 74842150811593591 80125384847573491 85408618883553391 90691852919533291 95975086955513191 101258320991493091 106541555027472991 111824789063452891 117108023099432791 122391257135412691 127674491171392591 132957725207372491 138240959243352391 143524193279332291 148807427315312191 154090661351292091 159373895387271991 164657129423251891 169940363459231791 175223597495211691

In October 2015 the UK lottery changed from 49 balls to 59 balls. Which means the chance of choosing 6 correct numbers went from 1 in 13,983,816 to 1 in 45,057,474. But the 45,057,474 number is wrong. Because of a new possible prize, not only can you possible win a never-ending supply of tickets, but the real jackpot odds are 1 in 40,665,099. Read my lottery article in the Guardian: http://www.theguardian.com/commentisfree/2015/jun/17/national-lottery-balls-bigger-prizes See the official new lottery rules: https://www.national-lottery.co.uk/lotto-changes#Changes-to-Lotto

You don't truly own anything until you've voided its warranty. So open an appliances and destroy the buzzer! Modern electrical appliances are amazing. Unless they make annoying beeping noises. Then they are the worst thing to plague humankind. This is a call-to-arms to remove, destroy or neuter the piezo buzzers in modern electrical appliances. Using a Kitchenaid kettle as an example. It's easy. Give it a go! (But make sure the appliance is not still powered. Electricity can kill.) Orignal guide here: https://thedialist.wordpress.com/2014/05/08/de-beeping-a-kitchenaid-kettle/ More maths and less electronics next time I promise.

0.999999... = ? Matt and Jordan meet-up in the Penguin offices for a chat about profound but simple mathematics and adding infinitely many things. Jordan Ellenberg's book: http://www.jordanellenberg.com/how-not-to-be-wrong/ Matt Parker's book: http://makeanddo4d.com/ Watch the BONUS FOOTAGE: https://www.youtube.com/watch?v=qJiVhfR_XVE Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

1 + 1 - 1 + 1 - 1 + 1 - 1 +... = ? 1 - 1/2 + 1/3 - 1/4 + 1/5... = ? Matt and Jordan continue to chat in the Penguin offices, covering Grandi's series and the Alternating Harmonic Series. Watch the first video: https://www.youtube.com/watch?v=rT1sIVqonE8 Find your local MathsJam: http://mathsjam.com/ Jordan Ellenberg's book: http://www.jordanellenberg.com/how-not-to-be-wrong/ Matt Parker's book: http://makeanddo4d.com/ Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Matt Parker, International Man of Mathematics, looks at the shapes of iconic Sydney structures. Turns out the Sydney Opera House is made from sections of a sphere and the Sydney Harbour Bridge has a feel of the catenary about it. The story of the Sydney Opera House and its shape: http://www.australia.gov.au/about-australia/australian-story/sydney-opera-house If you know more about the Sydney Harbour Bridge, email: [email protected] Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Yes, it's Nyan Cat but with a NAND gate as a body. Funny stuff. More on binary logic gates and dominoes: https://www.youtube.com/watch?v=OpLU__bhu2w The 'Micro-Month: MARCH 2015' video where NAND Cat debuted: https://www.youtube.com/watch?v=g7TGA-EzBHM Original 'Pop-Tart Cat' animated gif by Christopher Torres Original 'Nyanyanyanyanyanyanya!' song by Daniwell. Put together as 'Nyan Cat' by Saraj00n. https://www.youtube.com/watch?v=QH2-TGUlwu4 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Micro-Month: a month in one millionth of the normal time. MARCH 2015 "New 3D NAND flash memory from Intel, Micron could result in 10-terabyte SSDs" http://www.zdnet.com/article/new-3d-nand-flash-memory-from-intel-micron-could-result-in-10-terabyte-ssds/ "Homeopathy not effective for treating any condition, Australian report finds" http://www.theguardian.com/lifeandstyle/2015/mar/11/homeopathy-not-effective-for-treating-any-condition-australian-report-finds Amazing solar eclipse photos by ESA: https://twitter.com/esa/status/578843957028868096 Disappointing cloud photos by Gemma Arrowsmith: https://twitter.com/mmaarrow/status/578843768696238080 Written by Matt Parker Music by Howard Carter Design by Simon Wright Water photo by Derek Gavey Herbs photo by Christine Spanginator MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

There was a solar eclipse on the 20 March 2015 and so I thought I'd make a quick video of the mathematics behind predicting eclipses. I now regret that decision. EDIT: I over-simplified the elliptical orbit of the moon but not putting the Earth at one of the foci, which messes with the closest and nearest points at 3:40. Elliptical orbits are not that simple. NASA pages on the moon's orbit and the Saros cycle: http://eclipse.gsfc.nasa.gov/SEhelp/moonorbit.html http://eclipse.gsfc.nasa.gov/SEsaros/SEsaros.html Photograph of the total eclipse is copyright Anthony Ayiomamitis and used with his kind permission. https://www.flickr.com/photos/ayiomamitis/4797792174/ The paper on the long-term instabilities of planetary orbits is here: http://www.nature.com/nature/journal/v459/n7248/full/nature08096.html Fred Espenak is the eclipse dude: http://www.mreclipse.com/MrEclipse.html Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Inspired by Paul Taylor, I have made a pendulum to calculate pi. A pi-endulum. Its length is a quarter of the value for the acceleration due to gravity, so its period is exactly one pi. Watch Paul's version: https://youtu.be/UUH1wxwT9AE?t=1m55s Watch a mile of pi: https://www.youtube.com/watch?v=0r3cEKZiLmg Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

To celebrate Ultimate Pi Day I have calculated a numerical approximation of pi by weighing a circle. March 14, 2015 → 3 / 14 / 15 ≈ π 3.1415 is within 0.003% of the true value of pi. Can I do better with some cardboard and scales… See all of the Aperiodical's Calculate Pi Challenge: https://youtu.be/UUH1wxwT9AE Watch me calculate pi with pies: https://youtu.be/ZNiRzZ66YN0 Music by Howard Carter Design by Simon Wright MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ New book: http://makeanddo4D.com/ Nerdy maths toys: http://mathsgear.co.uk/

Matt Parker and a team of Domino Computer Builders balanced over 10,000 dominoes in a carefully designed circuit. The result was a Domino Computer capable of automatically adding numbers. It can take any two four-digit binary numbers and return the five-digit binary sum. It's a computer, made of dominoes. Watch the Numberphile where Matt explains more of the maths: http://youtu.be/lNuPy-r1GuQ As well as the secret Numberphile bonus interview: http://youtu.be/rEw2hE8ZRlY There are free worksheets and teaching resources about binary numbers and logic gates here: http://think-maths.co.uk/downloads/domino-computer-worksheets Computer design: Matt Parker, Katie Steckles, Paul Taylor, Andrew Taylor, Siân Fryer Builders: Ben Curtis, Becky Smedley, Mike Bell, Blair Lavelle, Andrew Pontzen, Jonathan Sanderson, Elin Roberts, Chris Roberts, Ben Ashforth, Gillian Kiernan, David Julyan Thanks to Marieke Navin, Natalie Ireland, Nicola Frost and everyone at the Museum of Science and Industry who made this possible. http://www.mosi.org.uk/ Huge thanks to Jonathan Sanderson at StoryCog for making the video. http://storycog.com/

The 27 Card Trick is my favourite mathematics cards trick, presented here with the all-new 49 Card Trick. This video is part of Mathematics Awareness Month 2014, as organised by the Mathematical Association of America. See http://www.mathaware.org/ for more Math, Magic, and Mystery. This is a preview of my contribution, you can see all the other tricks and math in April 2014.

Because a pterodactyl is awesome at any scale. Music is: Fourth Floor Collapse - The Same Mistake http://www.youtube.com/watch?v=NQKMn446D0A

Matt Parker performs a near-impossible card trick. If you can work out how it is done, either put your theory in a comment below, or put your theory to the test and film yourself doing the trick.

Use a CO2 Fire Extinguisher to produce dry-ice and then freeze icecream.

Matt was given this shape by Mike Borcherds at the 2011 MathsJam Weekend. Do you know what it is called? Can you make one? Proof of either in the comments please. MathsJam Weekend: http://mathsjam.com/ Mike: https://twitter.com/mike_geogebra

Venus passes in front of the Sun from the Earth's point of view very rarely. It occurs in eight-year pairs, but then with gaps of over 100 years between those pairs. CORRECTIONS: Ok, so I mistaked a few words. There's an early "2017" that should have been "2117" and at least one "day"/"year" swap. I really was recording that right before the transit and only had time for one take. More importantly, I said that 105.5 years before the next transit meant it would be mid-way through 2117. Actually, 105.5 years from now is the end (December) of 2117. Finally, I made a lot of simplifications, including setting my spreadsheet to use this 2012 transit as the zero-point for the sweet-spots. All improvements welcome!

Matt Parker shows you how to cheat and make it look like you know how to solve the Rubik's Cube. If you want to solve it properly, Matt's video guide is over here: http://www.youtube.com/watch?v=0Li_tLtgddo If you want to know more about the "Group Theory" behind the Rubik's Cube, watch Katie's video: http://www.youtube.com/watch?v=FeVysczKR_k

Matt Parker performs a stand-up maths routine about barcodes at the Hammersmith Apollo, as part of the 2011 Uncaged Monkeys national tour. http://standupmaths.com/

A puzzle involving a princess with strange sleeping habits and a price with unknown motives. I came across this at the Newcastle Maths Jam, November 2011. http://mathsjam.com/

Before a maths lecture, Matt Parker explains how he lost his voice chasing after - and catching - someone who stole his mobile phone.

This video both explains and defies Wadsworth's Constant.

"Accuracy" and "precision" have different mathematical meanings. The difference between accurate and precise data is explained using kittens and mittens

This is the 7 June 2011 explosion on the Sun as compared to the destruction of Alderaan from the Star Wars (A New Hope) film. When comparing the "amount of awesome", the Sun's explosion is approximately 2.2 Kilo-Alderaans of awesome. For more sun info, see Lucie Green: http://luciegreen.com For more awesome info, see Matt Parker: http://standupmaths.com