› added 9 years ago

102

TIL that two scientists proved time dilation by each flying around the world carrying a synchronized atomic clock. Upon landing, the clocks were no longer in sync.

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8aVnL TIL light doesn't always travel at the speed of light and has been recorded as slow as 38 m.p.h. (17 meters per second)
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N7gpb TIL that Henry Hiemlich used the Hiemlich Maneuver for the first time, at 96 years old in 2016.
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