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TIL Klystron (linear beam vacuum tubes used in particle accelerators) comes from the Greek verb klyzo - referring to the action of waves breaking against a shore.

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neQwW TIL that in 1769, the Royal Society issued a series of tests to ensure Mozart was actually 8. Daines Barrington, who conducted the study, was convinced after seeing Mozart abandon his harpsichord in the middle of playing to chase a cat; they could not 'bring him back for a considerable time'.
e0l46 TIL Red Hot Chili Peppers drummer Chad Smith first met his doppelganger, actor Will Ferrell, at the premier of the film The Ladies Man. After the two finally met, Ferrell looked at Smith and said, completely deadpan, “You are very handsome” before walking away.
78WQX TIL that rainwater is almost never pure and that in some areas the individual raindrops form around airborne bacteria.
7rvkO TIL all of the reindeer depicted at Christmas time with antlers are female as male reindeer would have already shed them.
VBAVm TIL that sometimes physicists use the supernatural in their hypothetical thought experiments in the form of demons.