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TIL Louis Braille faced resistance towards and doubts about his writing system for the blind, called Braille. His school burned books he and his classmates had transcribed into Braille, since the school thought that the effectiveness of Braille was a threat to their revenue.

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LkDW0 TIL that 'OK' is thought to be the most frequently spoken or written word on the planet, and likely originated from a 1840's fad of "comical misspellings" which turned 'all correct' to 'oll korrect'. A nearly 200 year old meme, basically.
0wKrL TIL ancient Greeks never mentioned the color blue, with Homer describing the sea as "wine-dark", and while researchers first believed the Greeks were color blind, recent experiments with modern peoples suggest that we can't see the color blue until there's a word for it
Ow5L TIL that five days after Hitler committed suicide, German and American troops fought side by side to defend Itter Castle against Himmler’s SS.
4XAa TIL “When flatworms mate, two "males” use their bifurcated penises to fence one another. The winner, or the flatworm who stabs the other with its penis, remains male while the loser becomes female.“
Q6LL TIL that Harold Gillies is considered to be the father of plastic surgery; after the first world war he performed thousands of surgeries mostly for soldiers with facial injuries, usually from gunshot wounds