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TIL about the triple point of water, where under specific conditions it can boil and freeze simultaneously.

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4XeB5 TIL about Mariya Oktyabrskaya. When her husband was killed in 1941, she paid for a tank, named it "Fighting Girlfriend," and distinguished herself as a fearless and deadly tank driver, often repairing her tank under heavy fire. After she died in March 1944, she was named a Hero of the Soviet Union.
xVwvD TIL penguins were named for their resemblance to “penguins” a now-extinct bird unrelated to penguins
VMXVD TIL that Trader Joe's has a "try before you buy" policy - where employees will open nearly ANYTHING for you to sample
1vA8 TIL that when in a double-blind test 21 experienced violinists were asked to compare new and old violins the least-preferred was a Stradivarius.
4XraJ TIL that Calvin and Hobbes' personalities match those with the 17th century philosophers of the same name.