› added 10 years ago

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TIL that night vision goggles are green because the human eye can differentiate more shades of green than any other color.

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9YmRB TIL of four interwoven studies of smokers, found that sadness increases cravings, frequency of smoking, and volume of puffs, and also predicts smoking relapses, even decades later.
7QVO TIL silver is naturally antibacterial due to the metal ions denaturing the organism’s proteins
E1WAx TIL the "horned sign" is an ancient hand gesture meant to either ward off, or curse someone with, the "evil eye", or malocchio in Italian. Ronnie James Dio re-popularized the gesture as the "sign of the horns" when he joined Black Sabbath in 1979, having originally learned it from his grandmother.
0dNQj TIL that Ruhollah Khomeini never issued a fatwa against Salman Rushdie. What was given was called a hukm, which - unlike the fatwa - remain valid even after the death of the authority who issued it.
9YRaQ TIL: Asbestos is not banned in the US. It’s still imported raw and sold in consumer goods.