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TIL Coyotes use their howls and yipping to create a kind of census of coyote populations. If their howls are not answered by other packs, it triggers an autogenic response that produces large litters.

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J17M1 TIL the US, didn't switch to the Gregorian calendar until 1752. By that time, the difference between their calendar and Gregorian had accumulated to 11 days. To adjust for this difference, September 2, 1752, was followed by September 14, 1752, effectively omitting 11 days.
WkVnL TIL the word mile originates from the measurement of one thousand paces of a Roman soldier (mille passus)
8L14 TIL that for winning the 1922 Nobel Prize in physics, Carlsberg brewery gave Niels Bohr a house located next to their brewery, complete with a direct pipeline so that Bohr had free beer on tap whenever he wanted.
XE94R TIL that this mask is called a balaclava, and not just “cheeki breeki mask”, “russian mask”, or “ski mask”.
VBwnk TIL that it took a month for Ernő Rubik to solve a wooden block prototype of the Rubik's Cube