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Short answer: Every once in a (very long) while

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RrE7 TIL that Mikhail Kalishnikov, inventor of the AK-47, greatly regretted having invented the weapon, and is quoted as saying “I would prefer to have invented a machine that people could use and that would help farmers with their work - for example a lawnmower.”
Kpd9 TIL The Thirteenth Amendment to the US Constitution abolished slavery EXCEPT as a form of punishment for crimes
ryow TIL that People were confused how a Chinese couple managed to run a busy restaurant 21 hours a day without getting tired. Locals named it “robot couple restaurant”. Turns out the restaurant is run by two couples - both the men and women are identical twins.
neR4o TIL In 2014, the UK based EIA (Environmental Investigation Agency) named Rakuten as “the world’s biggest online retailer of whale meat and elephant ivory, calling on the company to stop selling the items.”
b6y09 TIL Diamonds rain on Saturn and Jupiter due to extreme atmospheric pressure. Methane breaks down into solid carbon, the raw material for diamonds. Over time, carbon crystallizes into the diamonds we know, thanks to the planets' unique conditions.