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TIL Chemotherapy drugs to fight cancer were discovered in WW1 where the effects of mustard gas on surviors reduced the amount of rapidly dividing cells like white blood cells. First drug developed based on this research was called Mustine.

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DAJP TIL Men traditionally walk with a woman on his left arm so that his sword arm would be free in case of a duel.
KOGBR TIL the spotted white porcelain anemone crab has highly unusual seafan-shaped claws which it uses to filter the water while sitting on top of an anemone by first collecting mucus from its host anemone's tentacles and then using that to attract and gather small sea creatures and plankton for food.
oRyEr TIL there are almost 50 times more sheep in North Korea than South Korea. North Korea has 257.9k sheep, while South Korea has 5.4k sheep.
nw6W TIL the creator of pop-up ads, Ethan Zuckerman, apologized for its creation, saying “I’m sorry. Our intentions were good.”
4kmMX TIL Charles Osborne, born in Iowa in 1894, led a quiet life until 1922 when he suffered an accident. This incident triggered constant hiccups that persisted for 68 years, making Osborne a famous figure and landing him in the Guinness Book of World Records.