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TIL Giuseppe Piazzi, following his discovery of the Dwarf Planet Ceres, had difficulty tracking its position given the lack of data. Carl Friedrich Gauss, upon hearing this, worked for three months on the problem and successfully predicted its position within half a degree a year after discovery.

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Orn7 TIL that the London Bridge in Lake Havasu, Arizona is the same bridge that spanned the Thames river in London, England, relocated in 1968.
m1pgx TIL that thanks to Bromelain, a digestive enzyme found in some fruits, when you eat pineapple, the pineapple is eating you back! Same for kiwi and papaya.
nWaLY TIL JFK ordered 1200 of his favorite cuban cigars the night before he signed the cuban trade embargo
R77va TIL that during WW2, American and Soviet russian fighters engaged in a dogfight over Serbia. It was one of the only two direct military engagement between the two nations in history.
logN1 TIL about the Indonesian Communist purge in 1965/66 - over 500,000 to 1 M communists were killed, and US played a significant role in the killings, supplying economic, technical and military aid to the Indonesian military when the killings began and providing "kill lists"