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TIL that the Voyager 2 carried a tape recorder whose reels rotated at high speeds which caused issues with its operations. Due to the conservation of angular momentum, the space probe started an undesirable rotation in the opposite direction whenever the tape recorder was turned on.

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x6beD TIL of the "Shoe Fitting Flouroscope" or "X-Ray Shoe Fitter" which existed in shoe stores up until the 70's - Allowing customers (mostly children) to look through a viewer at a live X-Ray of their feet, to see the bones of their toes and how they lined up with the stitching of the shoe's sole.
weMW TIL a sophomore history teacher in California conducted an experiment on his class to show the appeal of fascism. He created a fascist movement resembling the 3rd Reich within the class that voluntarily grew from 30 to 200 members in only 3 days, ending only because the teacher began to lose control
nWkl9 TIL about the Abode of Chaos. Artist Thierry Ehrmann bought an old scenic house in a rural town and transformed it into a replica war zone that serves as an open-air museum of radical avant-garde art. This has angered locals enough to sue him in France's supreme court.
mxr0E TIL Bears can be chased off by dogs, as they associate them with wolves, or humans. Where there's one wolf, there's usually a pack waiting. (Or some human with a gun/phone with animal control)
OGMxX TIL Wernher von Braun conceptualized a six-week stay on the Moon with a 1952–1954 series in Collier’s Weekly, featuring 10-ton tractor trailers for moving supplies. In 1971, David Scott became the first astronaut to drive on the moon