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TIL: St Patrick was English, and the "snakes" he drove out were likely Irish pagans, making St Patrick's Day a celebration of the English invading the Irish.

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RJoa TIL of the ‘Radium Girls’ who worked in a factory where they worked with luminescent radium. Not knowing it was dangerous, they oftenpainted it on their lips and teeth for fun. They began to develop radium necrosis, causing their jaws to rot and develop disfiguring tumors, and eventually died.
ZpKbR TIL Taylor Swift’s first job was to knock praying mantis pods out of Christmas trees.
aP5y TIL that when bubbles are collapsed by sound waves it creates light and no one knows why. It’s called “Sonoluminescence”
eglg TIL a man in his 70s is the only person to have run the NYC marathon every year since it began. He ran it in about 5 hours in 2014 (link in comments).
Z8RrB TIL when in 1988 Consumer Reports compared 4 American midsize cars, all suffered failures during the test - the Ford and Dodge had their A/C not work, the Eagle had a glovebox that did not close and an unopenable fuel filler door, and the Buick had a knocking engine and a broken door lock.