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TIL Scientists in the South Pole have a tradition of sitting in a sauna and then running outside naked to the ceremonial pole and back. They can go from a 200° F sauna to -100° F outside. They have to do it fast enough before frostbite on essential reproductory equipment. Not all are successful.

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mx4bP TIL that a locked up, solar powered satellite computer was successfully turned off and on again by changing its trajectory to pass through the shadow of the moon
mxnLO TIL that Olivia de Haviland and Joan Fontaine were sisters and lifelong rivals. They were born 15 months apart and were rivals as kids. When Joan won an Oscar against her sister in 1942, she ignored Olivia’s congratulations. 5 years later Olivia did the same to Joan when she won.
yYYv TIL that the word “muscle” comes from “musculus” meaning little mouse since a bulging muscle was said to ressemble a little mouse with the tendon as a tail.
6n88 TIL that in WWII there actually was a land battle fought in US territory, the Battle of Attu, the westernmost Aleutian Island.
7repr TIL ships that were constructed before 1945 are the primary source of steel that is not contaminated with radioactive nuclides. The atomic bombings of Hiroshima and Nagasaki along with nuclear tests and disasters have polluted the atmospheric air that is being used for the steel production.