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TIL in 2021 classified details of the British Army’s Challenger 2 tank were leaked online. A War Thunder player leaked details after a disagreement over the tank's in-game design. However the classified documents weren't considered "valid source material" & no changes were made to the in-game design

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Zp5Za TIL Newton tested the theory of gravitation involving the moon and Earth but found a discrepancy so large that he did not publish it. Six years later, a new measurement of the size of the Earth and distance of the moon came out and Newton recalculated again to show his theory worked
v16Px TIL that "butter eater" used to be a terrible insult as only barbarians ate butter in ancient times
Z89OQ TIL that the neutron star 'PSR J1748-2446ad' rotates on its axis 716 times per second, and is the fastest spinning known neutron star. At its equator, it spins at 24 percent of the speed of light.
Y774A TIL Simon Wells, the great-grandson of science-fiction author H. G. Wells, co-directed An American Tail: Fievel Goes West
rRxO0 TIL in 1911, physicist George de Hevesy suspected his landlady was bulking up his meals with leftovers; he proved it by sprinkling radioactive material over his dinner and detecting it in the next day’s portion