Tom Scott: Things You Might Not Know

This is an excuse to show you a really good tunnel (2023x9)

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The Catesby Tunnel, in the UK, is an old Victorian railway tunnel that has a new use: a secretive car testing facility, like a wind tunnel but in reverse. So rather than just show it to the world, I thought l'd answer a question: if you stick a camera on the outside of your car, how much does the drag cost you?