Hannah Fry finds out how 1970s car crashes helped us to count our steps, why WWII dog-fights led to a crucial health monitor and how fitness trackers are even being used to catch killers.
No comments yet!
Connect with us on your favorite platform
F*ck the pop-ups. One dollar gets you a clean screen and 4K quality. Don't think twice
🔒 Secure Payment • ⚡ Instant Activation • 💎 Cancel Anytime