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TIL that the only woman to ever appear on an US Dollar banknote has been Martha Washington. She appeared on the 1886 and 1891 series of one-dollar silver certificates. Her portrait was used again next to her husband, George, on the back of the 1896 one-dollar note

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e0KeD TIL 90 years before the invention of the modern wireless telephone, Alexander Graham Bell invented a device that could transmit speech using sunlight.
xVL0b TIL that George Lucas tried to get the rights to make a Flash Gordon movie in the late 1970s. He was denied, so instead he decided to make his own sci-fi movie called Star Wars
R5VQw TIL Kwanzaa was created in California in 1966
4XKZR TIL in one of hundreds of his dangerous visits to the Chernobyl disaster site, nuclear inspector Artur Korneyev was able to take a photo of himself in 1996 near the Elephant Foot, a radioactive mass that initially gave off more than 10,000 roentgens an hour
vPY97 TIL about the coolest animal in the world, the Argentine Lake Duck. Being able to fly, swim, and walk on land already makes most ducks pretty cool but this guy is dragging around a 16 inch penis that they use to lasso potential mates!