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TIL Astronauts on the Apollo missions reported seeing flashes and streaks of light when they closed their eyes. This was later confirmed to be caused by cosmic radiation bombarding their retinas while outside of the Earth’s magnetosphere.

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nWy9r TIL the idea of a "World Turtle" is centuries old, inspiring the Discworld novel series, as well as the phrase "turtles all the way down"
N7YdN TIL George Romero came up with the screenplay for "Night of the Living Dead" from a short story he wrote, which he "basically ripped off" from the Richard Matheson novel "I Am Legend".
jD4Q TIL that in 1987 a 16 year old girl went missing on a camping trip to search for Bigfoot in the Sierra Nevada. She was never seen again. The 43 year old man with her claimed she was taken by bigfoot, and avoided trial due to the lack of a body.
oaML TIL of a phenomenon, called Coffin Birth, where fetuses are naturally “birthed” by their recently deceased mothers.
M6yW TIL Baseball has a rule which says players cannot fraternize with the other team while in uniform.