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TIL that the "I" and "O" of a power switch are internationally-recognized symbols for "ON" and "OFF" because they are the binary symbols representing ON (1) and OFF (0), decided by the IEC (International Electrotechnical Committee)

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16pDD TIL in 1990 a printer for the U.S. Naval Academy put the word “navel” on the graduates’ diplomas.
LkQjV TIL NYC Mayor Fiorello La Guardia banned pinball in the 1940s as gambling that emptied the "pockets of schoolchildren in the form of nickels and dimes given them as lunch money". All pinball machines were rounded up and smashed dramatically by the mayor, before being dumped into city rivers.
N7M7J TIL 24 rabbits released in Australia in October of 1859 have multiplied to be in excess of 200 million, causing havoc to native flora and fauna
4XP0X TIL that mosquitoes perform musical duets before mating.Male mosquitos "buzz" at between 550-650 Hertz while females buzz at about 350-450 Hz. When female mosquitos fly close to male mosquitos, they harmonize their wing flapping as a signifier of good health and fitness.If they can't,no copulation.
l7o7N TIL that Antarctica has a museum, gift shop and post office in the same building, known as Port Lockroy, which is all open to the public. It is operated by the UK Antarctic Heritage Trust. Around 70,000 cards are sent from the post office each year.