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47

TIL that the central star of Butterfly Nebula is one of the hottest star known

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gGQX TIL The Vikings put a lot of effort into grooming (especially hair and beards), wore eyeliner, were considered vain, and were absolute hits with the ladies. Their combs and other accessories were sought after because of their quality.
R7119 TIL that the word "mudita" is, in a sense, a kind of opposite of "Schadenfreude": mudita is a kind of sympathetic joy -- the taking joy or delight or pleasure in the pleasure or success of others.
JP1 TIL that General Eisenhower ordered every citizen Gotha, Germany to tour the concentration camp Ohrdruf (a subcamp of Buchenwald). After the mayor of the town and his wife did so, they went home and hanged themselves (#80)
D6MY TIL the Tunguska Event, an explosion in Siberia in 1908, was 1,000 times greater than the atomic bomb dropped in Hiroshima, wiped out 80 million trees, and may have killed a total of 2 people
nWKpo TIL that the rediscovery of the Fast Fourier Transform happened after John Tukey attended the Conference of Experts to Study the Possibility of Detecting Violations of a Possible Agreement on the Suspension of Nuclear Tests then begun looking for a reliable way of detecting underground nuclear tests