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TIL humans were once an endangered species. 1.2 million years ago, at a time when our ancestors were spreading through Africa, Europe and Asia, there were probably only around 18,500 individuals capable of breeding.

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v1O58 TIL about Aimo Koivunen, a Finnish ski commando who in 1944 escaped from pursuing Russians by taking 30 pills of Pervitin. He skied for 400 kilometers in -20C temperatures with no food and ammunition, got injured by a landmine, and had a pulse rate of 200 beats per minute by the time he was found.
4byg TIL a 43-year-old man who had his penis torn off in a horrible accident at the age of 6 has received a “bionic”, 8-inch, fully functional penis crafted and installed in a pioneering surgical procedure
KVG9 TIL that the New Horizons space probe to Pluto is actually powered by Plutonium.
epa14 TIL Apollo 17 geologist astronaut Harrison Schmitt served in the U.S. Senate, becoming the only "natural scientist" in the Senate since Thomas Jefferson was Vice-President. Schmitt presently is Adjunct Professor of Engineering, University of Wisconsin-Madison, teaching "Resources from Space"
yVdxl TIL That there is a small island in the South Pacific, where villagers worship a mythical American WW2 veteran named John Frum, believing that he will bring them material wealth one day.