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TIL before the invention of the at home Pregnancy test in the 70s, doctors would inject a woman’s urine into rats and if the rat had ovulated, it was the sign of a positive pregnancy test

Read more history.nih.gov

via reddit.com

mL1E TIL A Frenchwoman, Jeanne de Clisson, became a pirate in the 1300’s for revenge after her husband was beheaded. Selling her lands to buy 3 ships, they were painted black with red sails. Hunting French ships, when she caught nobles, she personally beheaded them with an axe.
rNRW1 TIL that there is an enormous 1,300 year old set of ruins on an island in the middle of a lake in the middle of Siberia and archaeologists are unsure why it's there
woYyM TIL Terry Jones said of fellow Monty Python member Graham Chapman's death on the eve of the group's 20th anniversary, it was "the worst case of party-pooping in all history."
jN1GR TIL Major James Robertson of Australian Army once stole one of the only 20 German tanks from no man’s land, while being attacked by machine gun and mustard gas.
wo6P8 TIL that in 1845, Sir John Franklin's Arctic expedition aboard HMS Erebus and Terror vanished. The ships were discovered over 170 years later, and researchers believe lead poisoning from canned food and poor water filtration contributed to the crew’s fate