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TIL American captives in the Vietnam war would authenticate a new prisoner’s American identity by tapping the first five notes of “Shave and a Haircut”, against a cell wall, and waiting for the appropriate response

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5WPr TIL Caterpillars can retain memories after metamorphosis despite liquefying
KORV6 TIL in 2013, a wild male tiger walked right up to a tiger enclosure at a zoo in India. Attracted by a captive female, the zookeepers let him in through a door in the enclosure. He stayed for a month, then escaped by jumping the fence, then returned a few weeks later.
ANoOd TIL I learned, the 80s sitcom "Growing Pains," had a character named "Boner."
b6QLN TIL that astronauts can grow up to 2 inches taller in space because their spinal discs expand in microgravity.
Eg5WW TIL that Johnny Marks was a Jewish songwriter who wrote "Rudolph the Red-Nosed Reindeer", "A Holly Jolly Christmas", "Rocking Around the Christmas Tree" and other iconic Christmas songs.