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TIL in 1962 there was a serious laughing epidemic in Tanzania that spread across towns and caused people to laugh uncontrollably. It lasted for several months.

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xVB1w TIL that embassies are not sovereign territory of their associated countries, contrary to popular belief.
4XQON TIL of 67 yr-old 4'10" 100 lb Lorenza Marrujo, aka “Lady Ninja” who has a black belt in jiujitsu. When she saw a 5'9" 170 lb man attacking her friend, Lorenza bent his fingers back, hit him twice with her elbow in his sternum, and pinned him to the floor with knees on neck & chest till help arrived.
KYQDE TIL Olympic runner Carl Lewis was drafted by both the Chicago Bulls and the Dallas Cowboys in 1984
Br6vW TIL The LIGO gravitational wave detector can detect a change in a 4km beam of less than 1/10,000 the diameter of a proton.
OoAeX TIL that from 1897 until 1996 the federal government had a board of tea testers whose job was to make sure that imported tea was good enough to be sold in the US.