Measuring time is a complicated thing. Computers, banks, and stock markets in Denmark all use UTC, the international standard: but according to the law, they shouldn't. Edited by Michelle Martin (@mrsmmartin) Thanks to Thor Nielsen for the suggestion! I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Featuring the Gregory Brothers! Go subscribe to them: https://youtube.com/schmoyoho Pitch correction: it can make terrible singers sound decent, brilliant singer sound mediocre, or Cher sound like a robot. But how does it work? And is it possible to explain that without actually trying to understand Fourier transforms? I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

High-frequency traders have a few tactics on stock exchanges: but simply put, they gather price information faster than anyone else, sometimes even faster than the markets themselves, and use that to make a tiny profit many, many, many times. There are all sorts of solutions: but it turns out there's a simpler one that involves physics. Thanks to Ronan and all the team at IEX - you can find out more about them here: https://iextrading.com/ or on Twitter at https://twitter.com/IEX I fact-checked Ronan's claim about the SEC white paper because it seemed a bit too good to be true, but he's right: see Hu, E. (2018). Intentional Access Delays, Market Quality, and Price Discovery: Evidence from IEX Becoming an Exchange. SSRN Electronic Journal. https://www.sec.gov/files/07feb18_hu_iex_becoming_an_exchange.pdf [PDF] Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Subscribe to Neuro Transmissions! https://www.youtube.com/user/neurotransmissions or start with their video on how to train a cat to high-five: https://www.youtube.com/watch?v=VfsVw0ndFAQ We're all used to seeing MRI scans of brains. But how do they work? Can you really "see" brain activity, or read someone's mind? Alie and Micah from Neuro Transmissions went to get scanned -- and ended up having some fun with 3D printing, too.

Subscribe to Kurtis Baute! https://www.youtube.com/channel/UCTRM8LE1g6UXrVZKwgw5oEA or start with his one-take video on the history of the universe: https://www.youtube.com/watch?v=ObngtuPFI8A Inside his homemade, hermetically-sealed, airtight biodome, Kurtis Baute is already out of breath and surrounded by more carbon dioxide than he should be. And that's going to affect a lot of things -- including how smart he is. SOURCES: CO2 and Cognitive Function Scores: https://ehp.niehs.nih.gov/doi/pdf/10.1289/ehp.1510037 Indoor Air Quality and Academic Performance: https://www.gwern.net/docs/co2/2015-stafford.pdf

Subscribe to Up and Atom! https://www.youtube.com/channel/UCSIvk78tK2TiviLQn4fSHaw/ or start with Jade's video on quantum tunnelling: https://www.youtube.com/watch?v=WPZLRtyvEqo You've got a painting and two nails. Can you use both nails to hang the painting so that if either nail is removed, the painting falls? That's the puzzle: in this week's guest video, Jade's going to solve it with maths.

Go subscribe to Medlife Crisis! https://www.youtube.com/channel/UCgRBRE1DUP2w7HTH9j_L4OQ or start with Rohin's video on why you shouldn't test for everything: https://www.youtube.com/watch?v=7kQk9-KLPfU The Bajau people of Borneo can hold their breath longer than almost anyone else on the planet. How? Why? And how can the rest of us learn to hold our breath for longer? Rohin from Medlife Crisis explains.

The Multi Axis Trainer, or MAT, is an icon of space exploration and astronaut training. But other than spinning round kids at Space Camp: what's it actually used for? Thanks to Moriah and all the team at Space Camp! You can find out more about their programs for kids and for adults at https://www.spacecamp.com/ Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

The tourist guides promote it as Georgia's Little Grand Canyon: but this is a scar on the Earth, caused by humans either not understanding or not caring about geology. Is it natural? Or man-made? Or both? I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

WASSUP KINGDOM, it is time to GET JACK BACK for last week. Callum has Jack's backup and it's time for some FUN. Download link: https://share.dl/iijAKAJnn - if you play with him TAG US ⏩ is a series of YouTube videos from a future. [Content warnings for this video: frequent strong but censored language; mild nudity; lizards; hypoxia. While there's nothing too graphic on screen, this does contain depictions of torture, and it may not be a comfortable watch for some viewers.] STEALING OUR FRIEND'S MIND Story by Tom Scott Directed by Cambria Bailey-Jones - http://twitter.com/CambriaBailey Written by Cambria Bailey-Jones Sammy Paul - http://twitter.com/icoepr Produced by Sammy Paul Ash Horne - http://twitter.com/AshleyNHorne Callum Jack Shalloo - http://jackshalloo.co.uk Aaron Shaun Cowlishaw - http://spotlight.com/3011-7833-4246 Jack Charlie Hamblett - http://instagram.com/charliehamblett Director of Photography & Colour Grade Jamie MacLeod - http://jamiemacleod.co.uk Editor & VFX Elliot Gough - http://twitter.com/elliotexplicit Sound Recordist & Sound Design Dan Pugsley - http://danpugsley.co.uk Party Goers Fotina Papatheodorou - http://spotlight.com/7115-7865-8088 Jasmine Earl - http://youtube.com/channel/UC7vV1DESYGpQk5b2v_Nfmgw Runner Edith Windle - http://twitter.com/ediewizz Special Thanks Stefan Abingdon Guy Larsen Executive Producer Tom Scott A Penny4 Production I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

This is the story of one of the best, and also one of the worst, text messages I've ever received. It's about harm, about consequences, and about the responsibilities that designers, coders and hackers have to make sure we treat other people with care. I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

From January, every citizen of England and Wales will have a new social credit score. Advice from the Department for Community and Culture. ⏩ is a series of YouTube videos from a future. YOUR NEW SOCIAL CREDIT SCORE WRITTEN BY: Tom Scott VOICEOVER: Melissa Thom http://melissathom.me ANIMATED BY: Mooviemakers http://www.mooviemakers.co.uk I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Some American cities use buses, or trams, or trains. Peachtree City, Georgia, has a different solution: it's not quite public transit, but a hundred miles of golf cart tracks helps to keep cars off the road. More about Peachtree City: https://www.peachtree-city.org/ and https://visitpeachtreecity.com Edited by Michelle Martin (@mrsmmartin) With thanks to Titan Miller for emailing me the idea, back in 2017! I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

In the last week of December, 2028, humanity forgot about more than a century of pop culture. You've probably never thought about it, and never found it strange — but the reason is an artificial intelligence called Earworm. ⏩ is a series of YouTube videos from a future. WHY WE FORGOT THE 20TH CENTURY WRITTEN and NARRATED BY: Tom Scott ANIMATED BY: Jordan Husmann http://jordanhusmann.com I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

The Tree That Owns Itself in Athens, Georgia is well known. The other Tree That Owns Itself in Eufaula, Alabama, really isn't. It's the same story in a different place. Why? I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

That's it! That's the end of the series. You made it! Congratulations! Enjoy the best mime that Matt has ever done. BONUS MATERIAL: https://www.youtube.com/watch?v=XRtilePap0c FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

In a field near Elberton, Georgia, USA, sit a set of mysterious standing stones: mysterious not because they're ancient, but because they were funded by someone anonymous in 1980, perhaps as a message to any survivors of the end of the world. I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo The closing music is "Nearer My God To Thee", recorded by the US Marine Band c.1896, from the USCB Cylinder Audio Archive, cleaned and sped up: http://www.library.ucsb.edu/OBJID/Cylinder8785

I realise we never actually define "pumpy thing" in this video. I'm not going to define it here either. BONUS MATERIAL: https://www.youtube.com/watch?v=R_hjV2skRac FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Technically, the Inchindown oil tanks in Invergordon, Scotland, have the world's longest reverberation, but that makes a much worse title. We tested them with a loud noise and some very sensitive microphones. Matt's musical experiments: https://www.youtube.com/watch?v=CzMVJkTjKNc Behind the scenes on the Matt and Tom channel: https://www.youtube.com/watch?v=e4qplnaPjbk Thanks to Allan, Alan and Preston for all their help on the day, and to landowners the Bannerman Group for allowing us access! Edited by Michelle Martin, @mrsmmartin I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

No, a hail cannon isn't for if you just want to accelerate a lot of hail really quickly. This week: pseudoscience and real science! BONUS MATERIAL: https://www.youtube.com/watch?v=MgerCSpxSWo FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Sometimes, numbers on sites like YouTube and Twitter jump up and down; subscriber counts lag, like-counts bounce all over the place. Why is it so hard for computers to count? To answer that, we need to talk about threading, eventual consistency, and caching. Thanks to my proofreading team, and to Tomek on camera! The Cambridge Centre for Computing History: http://www.computinghistory.org.uk/ I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Our traditional Wartime Badass Episode this week, albeit a wartime badass whose weapon included expense reports. BONUS MATERIAL: https://www.youtube.com/watch?v=tFFoDDhl9DA FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Dinorwig Power Station, otherwise known as Electric Mountain, is a pumped-storage hydro station in Llanberis, Wales. And yes: it's Britain's largest battery. Here's how it works, and why some of the things you think you know about TV pickups might not be so true any more. Thanks to all the Engie team! More about them: http://home.engie.co.uk Public tours of Electric Mountain are closed until mid-2019, but you can find details here: http://electricmountain.co.uk/ Camera op: Ryan Priestnall Editor: Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

This time, we're taking on smør-panik, food politics, and - for the second week running - brandy. BONUS MATERIAL: https://www.youtube.com/watch?v=MqOWh0lzKOQ FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Every month or so, somewhere in London, a manhole explodes. It's so common that it doesn't make the news unless it's spectacular or someone gets injured. Here's why, complete with gratuitous pyrotechnics. Filmed by Perspective Pictures Pyrotechnics by Paul at Darkstar Pyrotechnics News articles: https://www.telegraph.co.uk/finance/newsbysector/energy/11169183/Explosion-in-city-street.html https://www.standard.co.uk/news/london/pavement-explodes-yards-from-pedestrians-and-cars-in-old-street-a3568676.html https://www.express.co.uk/news/uk/819198/london-manhole-cover-explodes-old-street I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

The final season begins! With a traditional tale of a military mistake and a wheel that spins and lands on France. BONUS MATERIAL: https://youtu.be/407IeeVA3C0 FULL PLAYLIST: https://www.youtube.com/playlist?list=PL96C35uN7xGIo2odDuuPeYtb7BtQ1kBhp WEB SITE and MORE AUDIO EPISODES: http://techdif.co.uk Featuring: Matt Gray: http://mattg.co.uk - @unnamedculprit Gary Brannan: @garybrannan and Chris Joel, who doesn't do this social media nonsense More from us: http://techdif.co.uk Directed by Grant Stevens Edited by Elliot Gough: http://www.youtube.com/ElliotExplicit Audio mix by Haerther Productions: https://haerther.net I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Ogham is an old Irish script made by carving notches into stones. It fell out of use more than a millennium ago - but it's an interesting exception to a linguistics and computer-science rule that I'd never even realised existed. Let's talk about the Ogham Space Mark. Thanks to all the team at the British Museum! You can visit their YouTube channel here: https://www.youtube.com/user/britishmuseum I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

There's a reason music videos look strange. I could just talk about framerate, cuts and continuity... or I could get an actual music video director. And a leaf blower. Directed by: Sammy Paul https://twitter.com/icoepr Produced by: Cambria Bailey-Jones https://twitter.com/cambriabailey Guy Larsen https://twitter.com/thisisguido Director of Photography: Ciaran O'Brien https://twitter.com/ciaranobrien Featuring: dodie https://youtube.com/doddleoddle Dancers: Deepraj Singh Annie Fox Leanne Vincent Liam Wallace Production Design: Guy Larsen Gaffer: Christine Alexander Camera Assistant: Rachel Hutchings Editor: Sammy Paul Colour grade: Ciaran O'Brien Runner: Jenna Bailey-Jones Extras: Michelle Martin Gianluca Suppa Xina Jailey Special thanks to: Grant Stevens Bob Stevens Jenny Stevens Matt Parker Maths Gear http://www.mathsgear.co.uk YouTube Space London and the team A Penny4 Production https://www.penny4.co.uk/ Maths Gear didn't actually pay for product placement in this video. The dice were surprisingly painful. I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

That's right, we're kicking Season 2 of the Basics off with a technical episode about a somewhat-obsolete technology! IT'S PARTY TIME. Wait, no, not party time. IT'S CODE TIME. Close enough. Let's talk about seven-segment displays, and about the longest word you can write with them. Public domain list of English words: https://github.com/dwyl/english-words Thanks to my proofreading team, and to Tomek on camera! The Cambridge Centre for Computing History: http://www.computinghistory.org.uk/ BONUS LINK: Genius regex crossword puzzle: https://regexcrossword.com/ I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

GUEST VIDEO PITCHES: https://www.tomscott.com/guest/ NZ and AUSTRALIA CONNECTIONS: https://www.tomscott.com/contact/ I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

In the 1830s, two French brothers, François and Joseph Blanc, pulled off the first telecoms scam in history. The optical telegraph, a line of semaphore towers stretching from hilltop to hilltop, was for government use only: but something as simple as the law wasn't going to get in their way. Thanks to Victoria Harrison for all her research and translation skills! Pictures of the original documents are uploaded here: https://drive.google.com/drive/folders/1xik-sJZMUf9GRNCAu7m7amQMZ7Mos1HM?usp=sharing CG effects by Mat Hill: http://mat-hill.com/ I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

Back in the 1920s, wingwalking claimed lives. Daredevils would move around on the top of a plane's wings, in mid-flight, often without any harness or any safety line. Maybe they'd be able to clip onto something during takeoff and landing, but maybe not. There are still a few of those true daredevil wingwalkers out there in the world, but in the 21st century... it's usually a bit different. Thanks to the team at Aerosuperbatics Wingwalking: http://www.aerosuperbatics.com/ (this isn't sponsored, and I paid for my flight). Edited by Michelle Martin, @mrsmmartin Post Audio by Emi Paternostro, http://proximitysound.com I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

For years, moderators of online forums and chat rooms have wielded a metaphorical "banhammer" to deal with anyone who steps out of line. Now it's real. Well, a bit more real, anyway. THANKS TO: Mat Hill for design and coding: http://mat-hill.com/ Chris Joel for the idea, and for wielding the hammer. Dan (Nerd³) for lending us his chat room: https://youtube.com/officialnerdcubed and https://twitch.tv/nerdcubed Emi Paternostro for audio mixing: http://proximitysound.com And Chris' friend Mark, on Mixer, for inspiring the whole thing: https://mixer.com/SparkyandCo I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

The Global Vehicle Target is the new standard for testing autonomous driving and crash test systems. To cameras and radar, it looks like a car: but if you hit it, it'll fly apart. So if your emergency braking doesn't quite work... well, this is what happens. Thanks to everyone at Thatcham Research! You can find out more about them at https://www.thatcham.org/ and about the target at https://www.thatcham.org/car-safety/driver-assistance/ Filmed by Tomek: https://youtube.com/tomek Edited by Michelle Martin, @mrsmmartin Post Audio by Emi Paternostro: http://proximitysound.com I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Instagram as tomscottgo

On a rainy Scottish island called Jura, it's time to talk about the Manual, about long-term sustainable success, and about not having just that one catchphrase. The term "viral" has fallen out of fashion in the last few years, which is why this series wasn't called "going viral". And in truth, that's not what you want to do. Post Audio by Emi Paternostro, http://proximitysound.com Jimmy Cauty and Bill Drummond were better known as the KLF (or the Timelords, or the JAMs, or...). Their Manual is out of print, but I'm sure that won't stop enterprising people from tracking down versions of it, or footage of their burn. The music for this series has been an instrumental version of "Game of Taking Chances" by Johannes Hager feat. Josefin Backrud, from Epidemic Sound I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

I've put the North-o-Meter, and some other old UsVsTh3m games, up at https://www.tomscott.com/usvsth3m/ - I've disabled the sharing buttons, though. No-one needs them to go viral again. In the middle part of "How To Be Popular On The Internet*", it's time to talk about giving the people what they want, about getting noticed, and about the north-south divide. Post Audio by Emi Paternostro, http://proximitysound.com I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

The first part of "How To Be Popular On The Internet*" is all about an old saying: if at first you don't succeed, try, try again. And if you do succeed... well, you're still going to need to do that. My site's still online: http://www.preparingforemergencies.co.uk/ The government's site is in the internet archive: https://web.archive.org/web/20040804033956/http://www.preparingforemergencies.gov.uk:80/ Post Audio by Emi Paternostro, http://proximitysound.com I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

In Porthcurno, Cornwall, there's an old telegraph cable landing station. It's how Britain talked to the Empire -- and it's now a museum. But the technology here isn't quite as obsolete as you might think. Thanks to Steve and all the team at the Porthcurno Telegraph Museum! You can find out more about them here: https://telegraphmuseum.org/ Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

The White Horse, in Uffington, is one of the oldest surviving works of art in Britain: carved into a hillside in Oxfordshire 3,000 years ago. Every year, it's rechalked by volunteers co-ordinated through the National Trust, a line of maintenance going back to before England had written history. Thanks to all the National Trust team! If you're free over the August bank holiday and fancy helping out, here's the link! https://www.nationaltrust.org.uk/events/9220f3c2-d50f-4a9e-9063-8d9346ed5da9/pages/details Thanks to Ian from IanVisits for giving the tipoff - he makes a cameo in this one! https://www.ianvisits.co.uk/ Camera by Paul (@cr3) - he also makes a cameo! Edit by Michelle Martin (@mrsmmartin) - who doesn't make a cameo. I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

Over on the RAF Starrship channel, I'm talking about the history of radar: https://youtu.be/VDC_RCh0ws8 - but over here, we're testing a 90-year-old piece of technology that was meant to be part of Britain's air defence. The Sound Mirrors, on Romney Marsh, were built in the late 1920s as a way to amplify the sound from aircraft engines over the English Channel. We're flying a bit closer than that, with a drone. STARRSHIP: Instagram: https://www.instagram.com/starrshiphope/ Facebook: https://www.facebook.com/starrshiphope/ Twitter: https://twitter.com/starrshiphope Website: http://starrship.space/ I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

At Reed College in Portland, Oregon, there's a TRIGA nuclear reactor, used for research. You can stand next to it and watch the blue glow from the bottom of a deep swimming pool. I had to visit. More about the reactor and about Reed College: https://reactor.reed.edu/ Edited by Michelle Martin (@mrsmmartin) Post audio by Emi Paternostro (http://proximitysound.com) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

90s VHS video filters are in fashion right now, and most producers are using the same filter as everyone else. Why does the filter look like it does? To answer that question, I went to talk to the person that wrote it! Thanks to Harry Frank and all the team at Red Giant - you can find out more about them here: https://www.redgiant.com (This is not a sponsored video!) Edited by Michelle Martin (@mrsmmartin) Graphics by Mr Weebl: https://www.youtube.com/channel/UC9wk6mlzKKN3_sVMPd2p-3Q I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

There are some stories in Canada that I'm not qualified to tell. Pull down the description to find out about them. YOUTUBE LINKS: * Residential Schools: Heritage Minutes: Chanie Wenjack https://www.youtube.com/watch?v=v_tcCpKtoU0 A Viceland interview with survivors: https://www.youtube.com/watch?v=9QMZaOVOin8 A CBC interview with a survivor: https://www.youtube.com/watch?v=nJ64DItsIi0 * Yellowknife: https://www.youtube.com/watch?v=ie5V-K70JUk#t=2m13 (from 2:13) WRITTEN LINKS: * Residential schools: On the facts of residential schools, UBC has a good primer: https://indigenousfoundations.arts.ubc.ca/the_residential_school_system/ For stories, full transcripts are available of survivors' testimony here: http://wherearethechildren.ca/en/stories/ * Yellowknife: This history of the Yellowknifes Dene First Nation, written in 1997, contains the history of the mine's effects on the community. From page 50 onwards: https://www.akaitcho.info/linked/weledeh%20yellowknife%20dene%20history.pdf

In the last few years, wildfires have been getting worse - and, oddly, it's because humans have been preventing them. From a helicopter above the forests of British Columbia, and from the Tree Ring Lab at UBC, let's talk about how we should just let some wildfires burn. Thanks to Bradley Friesen! He's about to properly launch his channel 'Destruction by Gravity': https://www.youtube.com/channel/UCL3Kr3kf9W34cUvurxl7AGw and Mister Bentley the Dog is on Instagram: https://www.instagram.com/mrbentley_thedog/ Thanks to Dr Lori Daniels at the University of British Columbia! Her recent research into wildfires includes: Chavardes, R.D., L.D. Daniels, Z. Gedalof, D.W. Andison. (2018). Human influences superseded climate to disrupt the 20th century fire regime in Jasper National Park, Canada. Dendrochronologia 48:10-19. and this op-ed in the Globe and Mail: https://www.theglobeandmail.com/opinion/we-created-bcs-wildfire-problem-and-we-can-fix-it/article35686104/ Thanks to the BC Wildlife Service for letting me use their photos: https://www2.gov.bc.ca/gov/content/safety/wildfire-status Edited by Michelle Martin (@mrsmmartin) Post audio by Emi Paternostro (http://proximitysound.com) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

In Dawson City, a small mining town in the Yukon, sits the Downtown Hotel. Inside there is a tradition that tourists have been trying out for decades: the Sourtoe Cocktail. Thanks to everyone at the Downtown Hotel! More about them: https://dawsoncity.ca/attraction/sourtoe-cocktail-club/ Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

In the far north of Canada sit the DEW Line stations: "Distant Early Warning". Built in the 1950s, these were the sites that would have sounded the alarm if the Soviet Union ever attacked North America. Or at least, they were until they went obsolete just a few years later. This video relies on public domain archive footage from: DEW Line Story (1958): https://archive.org/details/dew_line_story_1 https://archive.org/details/dew_line_story_2 Atlas the ICBM (1957): https://archive.org/details/342SFP00583AtlasTheIcbmCape And is based on the research of: Louis Isemann, James. (2018). To detect, to deter, to defend: the Distant Early Warning (DEW) line and early cold war defense policy, 1953-1957. http://krex.k-state.edu/dspace/bitstream/handle/2097/2161/JamesIsemann2009.pdf;sequence=1 [PDF] Schlosser, E. (2009). Command and Control. [https://amzn.to/2sQd6Fq (aff. link)] Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

This is it: one of these teams is going home with the trophy. It'll come down to knowledge, wits, and a bit of sideways thinking. This is the Lateral Grand Final. Pull down the description for links to everyone's work: Simon Clark, https://www.youtube.com/channel/UCRRr_xrOm66qaigIbwFLvbQ @simonoxfphys Sally Le Page, https://www.youtube.com/user/shedscience @sallylepage Helen Arney, http://helenarney.com @helenarney Kat Arney, https://katarney.com @Kat_Arney Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

Until recently, Canada didn't have a road link to the Arctic Ocean. But last year, the all-weather Inuvik-Tuktoyaktuk Highway opened, which meant that finally the country was connected "from sea to sea to sea". I set out to drive it, but it didn't quite go how I planned. Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

Both these teams have lost once; now it's either through to the Grand Final or off to the bus home. Welcome to the last chance saloon. Metaphorically, anyway, we're still filming in the same studio. Pull down the description for links to everyone's work: Geoff and Vicki are on All The Stations: https://www.youtube.com/channel/UC7ttKX46nJxUeXZ0aoD4Q5g and Geoff's own channel https://www.youtube.com/channel/UCd18OhMfRmjMjzSHP7Zrzmw They're @geofftech and @norwegiancheese Helen Arney, http://helenarney.com @helenarney Kat Arney, https://katarney.com @Kat_Arney QUESTION EDITOR David Bodycombe EDITED BY Michelle Martin @mrsmmartin GRAPHICS BY Support Class https://supportclass.net MUSIC BY Tobias Stich http://www.tobias-stich.com/ DIRECTED BY Matt Gray http://mattg.co.uk I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo

Giant Mine sits near Yellowknife, in the Northwest Territories of Canada. Once it was a productive gold mine, but after the gold ran out, the mining company went bankrupt and left the government to clean up the mess: enough arsenic trioxide dust to kill everyone on Earth. The solution: freezing it, at least for now. Thanks to all the team at the Giant Mine Remediation Project! More about them: http://www.aadnc-aandc.gc.ca/eng/1100100027364/1100100027365 The history of Giant Mine and the local First Nation people, a story I'm not qualified to tell: http://www.cbc.ca/news/canada/north/canada-150-betsina-family-nwt-1.4180681 Edited by Michelle Martin (@mrsmmartin) I'm at http://tomscott.com on Twitter at http://twitter.com/tomscott on Facebook at http://facebook.com/tomscott and on Snapchat and Instagram as tomscottgo