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TIL about an elaborate complex of temples in Caral, Peru, which was a thriving metropolis at the time the Egyptian pyramids were being built, and is the oldest know city in the Americas. It was inhabited between 2,600 and 2,000 BCE.

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vjr4 TIL that the American Mustache Institute is very real and their slogan is “Protecting the rights of, and fighting discrimination against mustached Americans, by promoting the growth, care, and culture of the mustache”
D11PY TIL that a landslide from Hawaii's Big Island could generate a tsunami estimated to be up to a kilometer in height, having generated one half a km in height 120,000 years ago
wolw8 TIL that the first female geisha appeared in 1751, with geisha before that time being male
LK5Q TIL that the ‘falling sensation’ and jerk reflex felt before sleep may go back to our ancestors having to re-adjust themselves when sleeping in trees, so they didn’t fall out.
L5Dr TIL in 1948, the United States signed the Universal Declaration of Human Rights as part of being in the UN. Article 12 says “No one shall be subjected to arbitrary interference with his privacy…or correspondence. Everyone has the right to the protection…against such interference or attacks.”