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TIL that Thomas Jefferson once met Mozart to commission a piece for his wife. However, he was put off by Mozart's personality, and ended up not going ahead with the idea.

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9wWXX TIL 13-year-old BlueScuti became the first human to reach the "kill screen" for the NES version of Tetris after a 40-minute 1,511 line performance. And until just a few years ago, the Tetris community at large had assumed that it was functionally impossible for someone to get much past 290 lines.
wLexo TIL that in 36 BCE, Roman statesman Marcus Varro wrote about germs, describing "minute creatures which cannot be seen by the eyes, which...enter the body through the mouth and nose and there cause serious diseases." The germ theory of disease would not be accepted widely for another 1,900 years.
lLdK TIL when composing the song “‘39”, Queen guitarist Brian May jokingly asked bassist John Deacon to play the double bass on the recording. Deacon didn’t got the joke and actually learned the instrument. In two days.
YpYOZ TIL that during WW2 an operation to destroy German heavy water plant (in captured Norway) had to delayed as a cooperative Norwegian caretaker was missing his spectacles, the bomb fuse was lit only after caretaker specs were found (as during the war, new eyeglasses were nearly impossible to obtain).
KOdpR TIL The yellow crystals that sometimes form after you deal with a zit/pimple are called Exudate. They are a mix of mostly proteins, white blood cells, and fribrin.