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TIL; the dingy blue lights in some public toilets is to prevent addicts from injecting heroin as the blue light makes it much more difficult to see veins

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bMap TIL F. Scott Fitzgerald only received $13 in royalties from ‘The Great Gatsby’ during his lifetime.
N7YPP TIL the Russian city of Tolyatti (pop. 700000) is named after Italian Communist Party Secretary Palmiro Togliatti for his role in setting up a venture between Fiat and Soviet VAZ (Lada), whose plant still dominates the industry of the city to this day.
JyXm TIL if everyone lived like a resident of the United States, we would need the resources of 4.5 planet Earths for sustainable supply.
mxQQM TIL Al Goldstein an American pornographer, In 1989, ran a full page ad in "Screw" offering $1 million for the assassination of the Ayatollah Khomeini, in response to Khomeini's fatwa against novelist Salman Rushdie for allegedly blaspheming Islam.
p8kjp TIL: Chlorate candles are used on submarie and in space to generate oxygen by burning a mix of sodium chlorate and iron powder. They have an indefinite shelf life and are surprisingly safe.