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TIL of the Hmong people, who communicate by whistling - the valleys of the Himalayas they live in make for ideal transmission, sometimes carried as far as 8km. They even perform whistling courtship ceremonies, and once in a relationship, lovers can make up their own ‘secret’ syllables!

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4KAg TIL the remainder of the Pentagon Papers (docs leaked in 1971 which demonstrated that the US gov’t systematically misled the public about the Vietnam War) were fully declassified in 2011 and are now freely available online
QV79 TIL In South Park when Kenny would die and Stan or Kyle would exclaim “they” and “you bastards” to apparently no one in particular, they are actually referring to Stone and Parker themselves, as though they are omnipresent within the show’s universe.
KYbyw TIL the classic board game Risk was invented by Albert Lamorisse, an Academy Award-winning filmmaker.
QJBM TIL that Karen Carpenter died on the same day that her divorce was supposed to be finalized. At her funeral her husband took off his wedding ring and threw it into her casket.
oRVlr TIL the US government allowed a Hungarian priest to live in the US embassy in Budapest from 1956 to 1971, where he was fully protected from the Red Army who wanted his head. He never left the building once in 15 years.