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TIL The legendary heart on satin intro for "I Love Lucy" was created specifically for the 1959–67 CBS daytime network rebroadcasts, and subsequent syndication. The original intros featured animated matchstick figures of Arnaz & Ball making reference to each episode's sponsors.

J1Ql8 TIL Schrodinger constructed his famous "cat experiment" to show that misinterpretations of quantum theory can lead to absurd results that do NOT match the real world - today many popularizers of science have embraced the absurdity of Schrodinger's Cat and claim that this is how the real world works
Owve TIL all of the actors in “Pirates of the Caribbean” learned how to work with cannons and swords in Pirates School, which included getting trained by the late famed swordsman Bob Anderson, who also was the lightsaber master who fought battles as Darth Vader in Star Wars films
dDWkQ TIL that the death rate for heart attacks increases by 15% on days when marathons are held in major US cities. This is thought to be due to road closures and traffic around the marathon route. Ambulance ride length increases by an average of four minutes on marathon days.
woLa8 TIL that a Wall Street restaurant, The Exchange Buffet, operated on the honour system, where customers would tally their own bills. It ran successfully from 1885 to 1963
dv6B TIL there is a plant that can can change colors and shape on demand. Boquila trifoliolata is the first known plant to exhibit mimetic polymorphism – the ability to impersonate multiple different host plants.