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TIL In the early 1970s the submarine USS Halibut was sent on a secret mission to tap a Soviet undersea cable. The cable was quickly found because the Soviets left signs warning fishing vessels not to anchor near it. The operation was successful and the tap wouldn’t be discovered until 1981.

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OnyL TIL a farmer in China grows Buddha shaped pears.
4XMWg TIL there's an ancient whistled language that's now "spoken" by only a few people
D1RBe TIL autistic people often are victims of exploitation/abuse by so called friends
0wwZR TIL before the electric telegraph, there was a system called the semaphore telegraph, where signals were communicated visually using a network of towers topped with pivoting blades and paddles that could be rearranged to indicate different symbols
DYlP TIL the word “oxymoron” is an oxymoron. The Greek word “oxy” means “sharp” and “moron” means “dull”.