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TIL the incisors of Beavers are orange because they contain iron. That iron strengths the teeth and better able to cut through wood.

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4kvK5 TIL that during WWII, the British MI5 used a "double cross system" to turn German spies into double agents, misleading the Germans about the D-Day invasion's location and timing, which contributed significantly to its success.
NOBJ TIL Kit Kats became so popular in Japan because of a literal translation of “kitto katsu”, which means “Surely win” and lead to the implication of the bar giving good luck (making it a popular snack, especially before exams.)
epMWg TIL the term "essential" in "essential oils" has nothing to do with being in any way "essential" to the human body - such as essential amino acids or essential fatty acids, it just means it contains the essence of the plant's fragrance
R5dr1 TiL: In the early days of airmail a pilot, named Dean Smith, was forced to land on a cow causing his plane to wreck. It scared him.
kJege TIL about the Toronto Circus Riot of 1855 - a group of clowns got into a fight with a group of firefighters at a brothel, which led to a massive riot. The end result was large scale police reform in Toronto.