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TIL the Greek city of Helike sank in an earthquake in 373 BC, and all of the inhabitants died. Over time, it was silted over and was thought to be legendary until it was rediscovered in 2001.

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JYQ9V TIL that in an urban revitalization effort, Cleveland attempted to set the Guinness Book of World Records by releasing millions of balloons from its downtown area. 60% of them wound up in Lake Erie, stymieing a rescue effort for two missing fishermen. Guinness denied the city any official records.
BdnD TIL In 1957 Henry Molaison had his hippocampus and amygdala surgically removed due to epilepsy, after the surgery he was unable to form any new memories and could not recall any past memories. He was institutionalized for research and essentially was “stuck in time”.
GYkD4 TIL that dozens of women sent Ted Kaczynski (the Unabomber) provocative letters. He fell in love with a fourth-grade teacher, who he forged a "deep connection" with. Music he composed was played at her funeral, and he called her his "Lady Love".
e0AmD Today I Learned that there are more possible orders of a deck of cards than there are atoms on Earth. Because of this, 99.7% of the time you shuffle a deck of cards, that is the first time in history that specific order of cards has happened.
LQBNP TIL that NASA proposed in 2017 that a "magnetic shield" placed between the Sun & Mars (Mars Lagrange point L1) could protect Mars' Atmosphere from being stripped away by solar wind.