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TIL in 1940 Swedish cryptographer Arne Beurling deciphered the Nazi's T52, a machine more complex than Enigma. This way, the Swedes knew about Operation Barbarossa before it began. Since they wouldn't reveal how this knowledge was attained, their warning to the Soviets was not treated as credible

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yQR8a TIL that the Moon has a crust, mantle, and core, experiences "moonquakes," and once had active volcanoes
BDkW TIL since 1974, South Korea has discovered four tunnels dug by North Korea with black-painted walls to make them look like coal mines.
BrlPx TIL that Willem Dafoe has been acting in movies every year since 1982. He still has a bunch of filming projects lined up for 2021.
8WmZ TIL President John Quincy Adams owned an aligator which he kept in the White House
poQe TIL that the funny way people talked in films between the 1920’s - 1950’s is actually called the “Mid-Atlantic accent” and was essentially invented to distinguish elites