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TIL about the sentinel hypothesis: an evolutionary psychology idea that explains why people have different sleep schedules. Night owls and early birds played important roles in early human life.

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BgWKr TIL in 1790, George Washington checked out (and never returned) two books from the New York Society Library, one of which was finally replaced, in 2010, by representatives of his estate at Mount Vernon
Nj9P TIL of blind sight, a type of blindness where the eyes are still functional. As a result, the individual is not physically aware of their surroundings, but their brain can subconsciously see and avoid obstacles.
KYbo9 TIL that the title of the Led Zeppelin song D'yer Mak'er is the punchline of a joke that only makes sense with an English accent.
wLpAW TIL that Reno/Tahoe was the divorce capital of North America in the early 1900s because of its very lax divorce laws and only requiring 24 weeks of residence to file for divorce.
aw8Mo TIL that a tribe from Napal risk their lives climbing the Himalaya Mountains to harvest honey made from the world's largest bees. The honey is collected from poisonous Rhododendron flowere. It provides a range of uses including psychedelic effects, as well as medical benefits.