› added 3 years ago

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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

QNl66 TIL lobsters never stop growing, which eventually can kill them. The increasingly large exoskeleton takes too much energy to shed, and they die of exhaustion.
njWP TIL that the solar system is passing through an interstellar cloud that physics says should not exist.
j6o6N TIL Donkeys have crosses on their backs
ewEJ TIL of bug chasers, an uncommon homosexual subculture in which men without HIV actively seek out those with HIV for sex so they can contract the virus.
8V5b TIL Fidel Castro claimed he survived 634 assassination attempts by the CIA