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TIL that some black cats have recessive genes that make them look a different color under sunlight. Cats with the B gene will look black, b gene will look chocolate, and b' gene will look cinnamon. Spending too long under sunlight may start "rusting" and the cat will look that way on the shade too.

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v1a6x TIL the Teen Talk Barbie's quip "math class is tough" generated controversy among educators who feared it contributed to negative gender stereotypes. It also inspired The Simpsons episode "Lisa vs. Malibu Stacy."
j6r9N TIL that in 1210, King John of England imprisoned a noble named Maud de Braose with her son William in a dungeon beneath Corfe Castle, and left there to starve to death. When their bodies were retrieved 11 days later, it was found that Maud had eaten parts of her son’s body before she died.
KYJKQ TIL Since dissecting human corpses was a taboo in the greco-roman world, Galens used Macaque Monkeys to study human anatomy, as he thought them to be the most anatomicaly similar to humans out of all the animal species he knew. This led to some errors, as they were less similar than he thought
KO5ME TIL that the treadmill was first introduced as a Prison Rehabilitation Device, meant to cause the incarcerated to suffer and learn from their sweat. When Oscar Wilde was sentenced to 2 years in prison in 1895, he was forced to use a treadmill as part of his punishment.
xW7g TIL that a recent educational experiment suggested that reading “The Boy Who Cried Wolf” increased children’s likelihood of lying. On the other hand, reading a book on George Washington and the cherry tree decreased this likelihood dramatically.