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TIL in ancient Sparta, men encouraged their wives to bear children from other men in order to help increase the population of the city.

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v1gAj TIL A black dwarf is a stellar remnant that has cooled sufficiently that it no longer emits significant heat or light. The estimated time for the Sun to cool enough to become one is about 1 quadrillion years, though it could take much longer than this, if weakly interacting massive particles exist
Bgd1W TIL The Flynn Effect reveals that human intelligence increases with each generation
Me9YV 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
9bAr TIL that dogs can eat raw bones and digest them, and they only choke on cooked bones which can splinter and break.
lenG TIL a local street sweeper from Detroit, Michigan, managed to catch and save 2 babies falling from buildings in separate incidents 1 year apart from each other.