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TIL crows are capable of forming close bonds with people. When an 8 year old girl left food out on a bird feeder, the crows would leave trinkets like earrings, hearts, and a “best friend” charm in return.

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mrly TIL In 1951, a scientist at Johns Hopkins Hospital created the first immortal human cell line with a tissue sample taken from a young black woman - Henrietta Lacks. Those cells, called HeLa cells, quickly became invaluable to medical research & saved millions of lives.
EKX0 TIL Bobby Fischer developed a variant of chess where the starting positions were randomized because he thought too many top level players were simply memorizing opening positions
R7K04 TIL that if Antarctica were a country it would be the second largest in the world, significantly bigger than #3 Canada
yXbp TIL that poison dart frogs raised in captivity are completely nontoxic. This is because they do not manufacture their own toxins. Instead, they simply concentrate toxins found in the insects they eat. When fed nontoxic insects, they cannot obtain the toxins, rendering them completely harmless.
grE6D TIL the Greenbrier Ghost led to the conviction of a murderer in West Virginia