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TIL In certain situations (the conditions of which are still up for debate) warm water has been observed to freeze faster than cold water, as the result of what is known as the Mpemba effect. These observations go far back enough to be traced to claims by ancient philosopher Aristotle.

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KO5AE TIL All speakers can work as microphones and vice-versa; if you plug your headphones into a mic input, you can speak into them and use them as a microphone. The inverse is true as well.
OGgZY TIL about Captagon, an illegal drug primarily produced in Syria and shipped to the Gulf states. The scale of the Captagon market is estimated by some to be three times the combined trade of the Mexican cartels.
e0405 TIL: Hitler never won a majority of the popular vote. The most the Nazis received in a free and fair election was 37% of the popular vote in the July 1932 German federal election.
yDx8 TIL that a Labrador Retriever service dog pulled his disabled owner into the recovery position after he was struck unconscious, then covered him with a blanket, retrieved his mobile phone and pushed it against his face, and only left his owner to fetch help. He could also operate an ATM card.
1aGOW TIL of "Steal This Book", an instruction manual by Abbie hoffman on, among other things, shoplifting, fare evasion, and protesting. 30 publishers refused to print it, and many book stores refused to sell it because people were shoplifting the book, as the title suggested.