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TIL in 1971 a Time Dilation experiment had 2 flights w/atomic clocks go around the world to prove Einstein's theories of relativity (time moves slower as you approach the speed of light, and/or when exposed to less gravity). The clocks gained 0.15 microseconds compared to the ground based clock.

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D1RQg TIL Johnny Otis, a seminal influence on American R&B and rock and roll, lived his professional and personal life as a Black man despite the fact he was ethnically Greek. He wrote, "As a kid I decided that if our society dictated that one had to be black or white, I would be black."
698Om TIL the Music Group Jethro Thull was named after a Eighteen Century British Agriculturist who invented the seed drill
Brgjr TIL ABC only aired "Clerks: The Animated Show" twice before canceling it. They aired the fourth episode first, and then aired the second episode despite the fact that the second episode is a 'flashback' episode, and derives much of its humor from the fact that it flashes back to the first episode.
e0Ry4 TIL that Kid President has brittle bone disease and is a motivational speaker because he wants to make the world a better place before he dies at an early age
MeAZ7 TIL about the Dyatlov Pass incident where in 1959, 9 experienced hikers mysteriously died in the freezing Ural Mountains after fleeing their tent. Most were in their underwear, 1 had a fractured skull, another had tongue and eyes missing. Circumstances remain a mystery to this day.