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TIL of "Unit 731", a secret Japanese research facility disguised as a water treatment plant during WWII. Responsible for some of the most notorious war crimes ever committed, researchers captured by the USA were secretly given immunity in exchange for the data gathered from their human experiments.

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9Wnp TIL that the guys who invented Lego are now the richest family in Denmark
NXgm8 TIL that 1 in 4 entrepreneurs in the US is foreign-born, and the biggest demographic shift toward entrepreneurship since 1996 has occurred in people aged 55 to 64 and the biggest decline has occurred in people aged 20-34.
b410 TIL the military refers to every time zone using a letter of the NATO phonetic alphabet. Therefore, in Honolulu, it is always “Whiskey time”.
Y71pv TIL that the color Purple was never used to represent a Kingdom or country before the 20th Century. It was because until the 1800s, purple dye was worth more than its weight in gold.
VB1w0 TIL - The first automotive recall was for the Ford Model T due to chigger bites. Ford either used Spanish Moss for seat padding or Spanish Moss as stuffing for Cypress wood crates, with the Cypress being used for the dashboard. Both items created a small ecosystem for the chiggers.