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TIL pupil size Is a marker of intelligence

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XE4Yk TIL of the "Petticoat duel"; in 1792, Lady Almeria Braddock challenged Mrs. Elphinstone to a duel in London's Hyde Park over remarks the latter made about the former's true age; they duelled with pistols, then with swords, until Mrs. E agreed to write Lady A an apology.
e54E TIL that in 2012 a Manchester couple jokingly invited Queen Elizabeth to their wedding, the Queen accepted and made an appearance along with Prince Philip.
b5np TIL that there is a business labyrinth in a limestone deposit in Kansas City.
rRLV0 TIL before "Psycho" movies had no set start times but Hitchcock's viewing rules changed that forever
Wvno TIL that before trees were common, Earth Was Covered by Giant Mushrooms