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TIL about Operation Sea-Spray, where in September 1950 a U.S. Navy ship spent a week spraying bacteria into the air about two miles off the northern California coast. The secret project's goal was to determine the susceptibility of a big city like San Francisco to a bioweapon attack.

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XEaPj 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)
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.
V1vm TIL that a wife who murdered her husband for playing poorly in a bridge game was found not guilty, traveled the world, became a millionaire, and ended up leaving the majority of her estate to her murdered husband’s relatives over 60 years later.
8e6Pa TIL Burt Reynolds turned down the movie terms of endearment for Stroker Ace which was a critically failure. Jack Nicholson won an Oscar for the role Reynolds turned down
X0Ay6 TIL Giant pandas are strong with powerful jaws and teeth so few animals will risk attacking them. However, young giant pandas are more venerable and thus at risk from predators, including jackals, snow leopards, and yellow throated martens.