Tom Scott: Things You Might Not Know

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.

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.

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

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-checke

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

Cape Reinga, at the very northern tip of New Zealand, is known for being where the Tasman Sea meets the Pacific Ocean, where two oceans collide. The truth, though, is a little more complicated than that.

Kerosene Creek is a natural hot spring near Rotorua, on the North Island of New Zealand. And there have been official warnings for years: don't put your head under water. It turns out that "brain-eating amoebas", naegleria fowleri, are a real, if rare, thing.

Olds Engineering, a traditional workshop and foundry, sits in Maryborough, Australia. It's not the sort of place you'd expect to find a new industrial invention in the 21st century: and yet the Olds Elevator, patented by Peter Olds, is just that.

A decade ago, engineers found the Humber Bridge had the same problem as many of the world's suspension bridges: unexpectedly fast corrosion. Here's how they fixed it, and how they're checking that it's staying fixed. Thanks to all the team at the Humber Bridge board, at Cleveland Bridge, and Visit Hull and East Yorkshire, all of whom spent a lot of time and effort getting me up to the towers!

Aerosparx are a British aerobatics team that perform displays with fireworks attached to their wings. This is how they do it.

If you've been a subscriber for a while, you probably know where this one is going. Although you may still be surprised about where I ended up going... Montana's Giant Springs State Park, and Lake Sumiainen in Finland, have very short rivers. Finding the shortest in the world, though: that could be trickier.

Oodi, the new Helsinki Library, has robots to help reshelve books. They get a lot of press attention. But they're not the important part of the library: here's why.

It sounds ridiculous, but it's true. At the Cooper Union Foundation Building in New York, there's the world's first lift shaft: constructed four years before the "safety elevator" was invented.

At the National Helium Reserve in Amarillo, Texas, the US government once stored 32 billion cubic feet of helium. There have been breathless news articles recently saying the world's running out: but it's still possible to buy party balloons. What's going on?