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TIL that in 1989, a sudden invasion of medflies hit California. This invasion cost between 60 and 120 million USD in eradication efforts. A group called “The Breeders” claimed it was a deliberate attack by themselves in response to the governments decades long Malathion aerial sprays.

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x075 TIL Rosacea, a skin disease found mainly in those of Northern European descent and also known as The Curse of the Celts, is actually an evolutionary adaptation acquired by ancestral Celtic people to fend off bacteria during seasonal periods of low ultraviolet levels.
XEE1E TIL in 1152 King Stephen of England threatened to launch the child of a rebellious noble from a trebuchet. He didn't and that child grew up to be William Marshall, called "the best knight who ever lived."
VjnD TIL the painter Raphael snuck into the Sistine Chapel to look at the unfinished work while Michelangelo was gone, and upon seeing the paintings, went back to a completed painting of his own at the Church of Sant'Agostino, scraped it off the wall, and started completely over.
DQxwv TIL that refrigerated bread isn't hard due to moisture loss but crystalized starch which can be fixed by simply heating it up.
DAyv TIL Michael the gorilla was taught sign language by Koko, the first signing gorilla. He began signing “Squash meat gorilla. Mouth tooth. Cry sharp-noise loud. Bad think-trouble look-face. Cut/neck lip (girl) hole.” Researchers believed this was a description of the poaching death of his mother.