The Happiest Thought

In 1907 a patent clerk realised that a man falling off a roof feels no gravity at all, and called it the happiest thought of his life. Eight years later it was general relativity. Ride the lift that cannot tell gravity from acceleration, bend starlight past the Sun, and watch the clocks in your phone's satellites drift by 38 microseconds a day. Episode 08 of the Great Scientists series.

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