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TIL that it is possible to reach negative Kelvin in advanced physics: a system's temperature is above 0K if adding energy increases its entropy (disorder of the particles). However, once the entropy is maximum, adding more energy makes it decrease, meaning the system's temperature drops below 0K.

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69gll TIL about empty nose syndrome (ENS) a disorder that sometimes occurs after corrective surgery for a deviated septum that makes its sufferers feel like they are constantly drowning and can often drive them to suicide
OLQ6 TIL The US is 15th on the list of countries which believe that “The US government respects the freedom of its people.”
MelZ7 TIL of "Spocking Fives," where Canadians would alter five-dollar notes to make Prime Minister Laurier's features resemble Spock from Star Trek. "Spocking Fives" was so prevalent that later releases of the five-dollar note had a different image of Laurier with less resemblance to the famous Vulcan.
ra9e TIL in 1967 a magazine published a fake story about extracting hallucinogenic chemicals from bananas to raise moral questions about banning drugs. People didn’t realize it was a hoax and began smoking banana peels to try to get high.
GApkE TIL I learned about Bagel Bakers Local 338, a local trade union that was established in the early 1900s in New York City and whose craftsmen were the primary makers of New York's bagels, prepared by hand, until the advent of machine-made bagels in the 1960s led to its end.