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TIL that salmon is actually a whitefish; its red color comes from a chemical absorbed from plankton

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w7R8 TIL The largest “air force” in the world is the US Air Force and the second largest air force in the world is the US Navy.
OGoOR TIL Canada has 8,500 rivers and 2 million lakes
9krm TIL in a variation of the 1963 Milgram Experiment, with a live puppy and real shocks, only half of the male participants went up to the full shock level, but all of the females did.
E1kE0 TIL The city of Berlin, Ontario, changed its name in 1916 to Kitchener because of Anti-German sentiment. They very nearly called it Corona.
MeMg8 TIL that the inside of a tornado is filled with blue lightning, and many little tornadoes. The air is smooth, not turbulent, but hard to breath.