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TIL of Gary Hall Sr, a former Olympic medalist swimmer who became an opthalmologist. He made so many medical errors and was reprimanded so many times that he was banned from surgeries. His medical license was revoked after it was discovered that he performed a surgery following the ban anyway.

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D1lme TIL the oldest mathematical artifact in the world is the Lebombo bone, found in the mountains of Eswatini (formerly Swaziland), Africa. The bone was likely used as a measurement device and to keep track of lunar cycles, suggesting that the first mathematicians might have been African women.
VBY9B TIL the world's shortest war happened in Zanzibar when the Sultan Khalid bin Bargash refused Britain's order to give Hamoud bin Muhammad his throne, the war started at exactly 9 a.m. and lasted 40 minutes.
4k9Qg TIL when the band Slayer came to Toronto in 2018, a fan was kicked out of the open-air venue they were playing at for unruly behaviour. He then jumped into the lake surrounding the open-air venue to swim back in. He was banned for a year, but was later immortalized on a beer can label.
oBNxR TIL: In the '60s a researcher put 3 men who believed themselves to be Jesus in a support group together, and all three ended up believing the others were wrong and they were still Jesus and the others were robots after much arguing over their divinity
kbeg TIL of albino redwoods. Unlike most chlorophyll producing plants, albino variants of redwoods don’t die as long as they are attached to a non albino redwood that is able to support them. There are only around 61 known examples of such plants