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Stream the full The Secret Genius of Modern Life Season 1 Episode 5 movie online for free in crystal-clear HD quality. No downloads required—just press play and enjoy the action, complete with English subtitles for an enhanced viewing experience.

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.