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TIL Since October 31st, 2000, there has always been at least one human being in space at all times. That is 8,199 continuous days and counting.

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via reddit.com

nebOP TIL about Henneguya salminicola, the first known animal that doesn't use oxygen to breathe. It is an 8-millimeter white parasite that infects the flesh of Chinook salmon
OG9Pe TIL humans are the "most sensitive" to the castor oil seeds: it takes 1 to kill a full grown human, 11 to kill a dog, and a massive dose of 80 to kill a duck. The seeds contain ricin which is roughly 6000 times more poisonous than cyanide.
grEO4 TIL that in 2014, in Hangu, Pakistan, 14 year old Aitzaz Hasan Bangash saved his high school from a suicide bomber by confronting the man alone. While other students fled into the school for safety and to raise the alarm, Aitzaz held the man at bay until his bomb detonated, ending his life.
5V9Pk TIL about the Swiss Guard's Last Stand. In 1527 Over 20k troops of Holy Roman Emperor Charles V, rebelled after not being paid for months, marched on Rome and sacked the city, killing thousands. Fearing for his life, Pope Clement VII fled and 142 Swiss Guard held off the mob, none survived.
kyAE TIL: Women who live in areas with polluted air are up to twice as likely to have an autistic child than those with cleaner air