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TIL that GPS(global positioning system) technology was originally restricted to military use. In 1983, Korean Air Lines Flight 007 was shot down by a Soviet fighter aircraft after it had strayed into Soviet territory. US President Regan then authorized GPS use by civilians.

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p8VLA TIL Unabomber Ted Kaczynski said, in a letter, that he would stop the killing if his manifesto were printed. The Washington Post printed the 35,000 word essay, at which point Kaczynski's brother recognized the writing style and turned him in.
1aRXO TIL that the dog breed St. Bernards were originally known as Barry Hounds, after a dog named Barry who lived at the St. Bernard hospice in the 1800s. Barry saved 40 people in the nearby mountains, and the hospice has always maintained one dog named Barry in his honor.
PY95J TIL Fidel Castro hated cults of personality. In Cuba, there are no statues of him, no streets or buildings named after him, and no official portraits of him.
LX9r TIL that Cannabidiol, a chemical extract from cannabis, is the first nontoxic substance found to fight aggressive metatastic breast cancer cells.
Wjx8 TIL Teller of Penn & Teller’s full name is legally just “Teller”.