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TIL in 1962, jousting was declared as the official state sport of Maryland.

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GdP5 TIL the Aral Sea (the 4th largest lake in the world in 1960) lost 80% of its volume by 1998 and went from a fresh water lake to being 3 times saltier than the ocean all due to a Soviet Era Irrigation Project
oB7JY TIL Bird poop is white because birds, unlike mammals, don’t produce urine. Instead they excrete nitrogenous wastes in the form of uric acid, which emerges as a white paste.
GANPN TIL about the Gävle goat, a Swedish Christmas display of a giant wooden goat which, despite this never being part of the tradition and being very illegal, has been burned down by arson almost every year since 1966
mxwrE The first ever YouTube video was uploaded 15 years ago today
rMVM TIL in 1972 a pocket of uranium in Africa was found to have undergone self-sustaining nuclear fission for over 100,000 years, making it the only known naturally formed nuclear reactor.