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The Secret Genius of Modern Life: Season 1, Episode 5
1 - 5: Fitness Tracker
With around a third of the population now owning fitness trackers, Britain has become a nation obsessed with tracking its every move.
Hannah Fry finds out how 1970s car crashes helped us to count our steps, why high-altitude WWII dog-fights led to a crucial health monitor and how fitness trackers are even being used to catch killers.
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