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TIL the US Post Office issued stamp on 13 May 1918 to mark the first official airmail flight, featuring an image of a “Curtiss Jenny” biplane. A printing error caused the plane to be shown flying upside down. Only one "Inverted Jenny" sheet was printed, making those stamps extremely rare.

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via reddit.com

VBLbZ TIL a controversy in Japan involving a famous weatherwoman, who received backlash from some of her fans after it became public knowledge that she had a boyfriend, led to the creation of a new word in the Japanese language, which literally translates to "business that preys on vulnerable men"
ADVLa TIL when billionaire Thomas Peterffy’s father met his new wife he gave his teenage son $100 and kicked him out of the house. With his final words being “Make something of yourself”
PYaGG TIL straight plastic bag bans implemented in Chicago and Hawaii resulted in many stores just upping the thickness of their plastic bags to 2.25 mils to cross the threshold that separates “single-use” plastic from “reusable” plastic bags under many bag laws.
1aKPr TIL the weird dream talking in Twin Peaks was achieved by having the actors say the words backwards then ‘reversing’ them
rRAB4 TIL bumblebees are capable of flying at altitudes much higher than Mount Everest. Two bumblebees were placed inside a plexiglass chamber and were able to reach a simulated altitude of 29,525 ft with air pressure being reduced. The chamber kept breaking before the bumblebees stopped flying.