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TIL During the Second World War, the U.S. Army discovered that colorblind soldiers could distinguish camouflaged targets better than their counterparts with color vision could.

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N47J TIL during the Rugby World Cup final a New Zealand player had his scrotum torn open level a testicle exposed in a tackle that also cost him 4 teeth. He had it replaced back and stitched up by the physio then returned to play only to be knocked out. He has no recollection of the game.
woP67 TIL Nine Inch Nails' Trent Reznor was the final resident of the infamous 10050 Cielo Drive house before it was razed--the house was the site of the Manson Family murders of Sharon Tate and her friends. Reznor recorded most of his career-defining album, 'The Downward Spiral' there.
X0v5k TIL Mel Carnahan was the first person to be elected to the Senate of the United States posthumously because the Missouri election law did not allow for his name to be removed from the ballot.
WkA98 TIL that during a flight of the Hindenburg over the UK a parcel was thrown overboard and found in West Yorkshire. It contained flowers, a small silver Cross, and a note requesting they be delivered to a passenger's brother's grave
m1LXM TIL about Theseus, a robotic mouse created by Claude Shannon in the 1950s, which could learn to navigate mazes using telephone relay switches, marking one of the first instances of machine learning. Theseus helped researchers better understand routing in telephone networks of that era.