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TIL that you would not die instantly if you were exposed in space. Scientists estimate that a human being can survive 15-30 seconds in open space (X-post r/TheBestLists)

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BgVND TIL about Arver v. United States, a U.S. Supreme Court decision which upheld the Selective Service Act of 1917. The court held that, citing Vattel's The Law of Nations (1758), a just government has a duty to protect its citizens, which obligates those citizens to render miliary service.
9wk5D TIL that a common male fertility test, Hamster Egg Penetration Test (HEPT) aka sperm penetration assay, uses hamster ovums in place of human ovums to test sperm’s ability to fertilize an egg.
b7Lp TIL a mother bear in a Chinese bile farm killed her cub and then herself because of the unbearable (no pun intended) and inhumane conditions they were subjected to.
MPrW TIL that flexibility is not about muscle elasticity, but about training your nervous system that further muscle stretching is safe, so it won’t fire pain signals to the brain. We can all do a split under anesthesia
nvb9 TIL That there is a suspended monorail in Germany that was build in 1897 and still moves 25 million passengers annually.