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TIL about Nicaraguan Sign Language. A form of sign language which developed spontaneously among deaf school children in Nicaragua in the 1980's. It is not based on any other existing language and is considered by linguists to be an entirely new language.

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nW6kP TIL that the San people, one of the most genetically diverse group of people in the world, have separated from the rest of humans around 200,000 years ago, just a 100,000 years less from the lowest estimate of when humans separated from Neanderthals.
NXab1 TIL MotoGP racers' forearms experience such consistent strain that most racers develop compartment syndrome and undergo surgery to treat it
Lk6e0 TIL: In 1969 24 journalists came together to write the worst novel they could come up with to make fun of US’s vulgar and declining literary culture. That hoax book became a bestseller the same year.
neBBW TIL of Abul Bajandar, sometimes referred to as the tree man.His hands and feet grew foot-long, gnarled "roots," skin lesions that left him unable to feed himself, move around, work, or wear standard clothing. He had to undergo more than 25 surgeries remove the growths in his hands and feet.
AJZa TIL while exploring South Dakota in 1822, Hugh Glass was left for dead after being mauled by a grizzly bear. He later awoke, set his broken leg, laid upon a rotting log to let maggots eat his gangrenous flesh, and crawled 200 miles to the nearest settlement, living off berries and roots.