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TIL in ancient India the Krosa, a Sanskrit word, was a unit of measurement defined by the distance at which a cow's moo is heard.

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Y7KQG TIL there are solar panels that harvest infrared light which allows them to operate in darkness
6EKo8 TIL for 26 years, German feminists Ottilie Assing and African-American Abolitionist Frederick Douglass were believed to be having an affair. I’m August 1884, after learning Douglass remarried to Helen Pitts, Assing killed herself by swallowing cyanide in a public park in Paris.
0WV5 TIL that Benedict Cumberbatch recorded his screen test for Star Trek Into Darkness at his best friend’s kitchen using an iPhone.
e0YR6 TIL that while bulking up on raw salmon, grizzly bears often become infected by tapeworms and expel them before hibernation, causing them to walk around with very long “tapeworms tails” coming out of their butts.
8MX8 TIL Louis Braille, the inventor of the reading and writing system for the blind Braille perfected it when he was just 15