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TIL Levi's Jeans helped create Casual Fridays in workplaces all over the world, taking inspiration from the Hawaiian Fashion Guild's 'Aloha Fridays' which were designed to sell more Aloha shirts in Hawaii.

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KOLxa TIL: Some farmers in Bangladesh have switched to raising ducks instead of chickens, because during catastrophic floods, ducks float.
8ajW8 TIL that GED Was Initially Only For Vets Who Were Drafted Into War Before They Finished High School. Civilians Weren't Eligible for GEDs Until Decades Later
dDaAQ TIL Kepler predicted that Venus' diameter is almost a quarter of the Sun's diameter, so Mercury should have a tenth of the Sun's diameter. Pierre Gassendi saw the true size of Mercury in 1631 during its transit across the Sun, and was surprised by how small it was as it looked like a sunspot
RkM6 TIL that blue lighting in public restrooms prevents heroin users from finding veins and shooting up
a8jMM TIL that during WWII, the U.S. referred to uranium from the Shinkolobwe mine in the Belgian Congo as 'gems' and removed the mine from maps to maintain secrecy for the Manhattan Project