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TIL In the Nazi Enigma code, a letter couldn't be represented by itself in the coded transmission. This flaw was exploited by Allied code-breakers and was a key part of the "Bombe" Enigma decoding machine designed by Alan Turing and engineered by Harold Keen.

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wjvE TIL The USSR named one of its last policies (which allowed the nations of the Eastern Bloc to determine their own internal affairs) the ‘Sinatra Doctrine’ - a reference to the Frank Sinatra song “My Way” as the Soviet Union was effectively allowing its satellite states to go their 'own way’.
XEQ9D TIL in spite of rumours of their enemity, Salieri and Mozart composed together a four-minute piece of music, that was considered lost until a copy was found in 2015
4kX1o TIL that when his film Uncut Gems began to receive critical acclaim, Adam Sandler threatened the world with making "the worst movie ever" if he did not receive a nomination for Best Actor at the Oscars. He was not nominated.
yVoPe TIL about "Bomb" a Canadian Sherman M4A2 tank that landed on Juno Beach on D Day and fought across Europe every day until the the words "Unload, clear guns, the war is over" came over the radio, indicating the end of the war. 4000km travelled, never missed a day of combat.
16no8 TIL about Deborah Sampson. She disguised herself as a man so she could join the Continental Army and fight in the Revolutionary war. She was shot twice but fearing someone would find out her secret she removed one of the balls with a penknife and carried the other bullet in her leg her whole life.