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TIL that one of the major factors that made Valentina Tereshkova, the first woman in space, as the choice for piloting Vostok 6 in June 1963, was that she proved lucky in the timing of her menstrual cycles earlier that month.

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YpovB TIL when stuck for a name, producers of the TV series chose the name "the Addams Family" after creator Charles 'chas' Addams. Up till this point, they were simply 'a family' of Gomez, Morticia, Wednesday, Pugsley, and Fester in his books and syndicated cartoons.
yVdRJ TIL of The Hawk’s Nest Tunnel Disaster where 100’s of workers died from silicosis after being forced to mine silica without the proper protective equipment. It was the deadliest industrial incident in US history. The site was owned by Union Carbide Corp.
R7mLa TIL PowerPoint is Turing Complete
rNRBM TIL when one adventurer drove a Jeep Wrangler to the world record altitude of 6,646 m, he left a sign saying "Jeep Parking Only: All others don't make it up here anyway.". The next record breakers, who had a Suzuki Samurai and climbed up to 6,688 m on the same volcano, removed that sign.
RLX4 TIL a sports science researcher from France, Jean-Denis Rouillon of the University of Besançon, found after fifteen years of empirical research that women who go braless have, on average, perkier breasts, with nipples on average 7mm higher in relation to their shoulders than regular bra users.