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TIL a 9,000-year-old structure, like Stonehenge, was found at the bottom of Lake Michigan. It even has a carving of a mastodon

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via reddit.com

MvL0 TIL that Swedish astronomer Anders Celsius (1701-1744), originally created the temperature scale Celsius with the freezing point of water being 100° and boiling point being 0°. Eventually after Anders Celsius died, scientists changed the scale to the way we know it today.
DQ86V TIL The government of the Republic of Botswana owns 15% of De Beers.
r850 TIL that the lyrics to the “Spider-Pig” song in The Simpsons Movie were written by 12 people
Qm6a TIL Bill Skarsgard (Pennywise from It), Alexander Skarsgard (Tarzan from The legend of Tarzan) and Gustaf Skarsgard (Floki from Vikings) are the sons of Stellan Skarsgard (Erik Selvig from Thor, Good will Hunting).
Lk4GZ TIL While hunting down a rival in 1963, Hiatian president Francois Duvalier was told that the rival had transformed himself into a black dog, which prompted Duvalier to order that all black dogs in Haiti be put to death