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TIL in 1854, Dr. Jules Baillarger depicted a mental illness expressed by switches between mania and depression. He named it dual-form insanity. Dr. Jean Falret described the same illness but named it circular insanity. They spent their lives disputing who first conceptualized it.

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VMOmG TIL of Philippa Fawcett, an English mathematician and the first woman to have topped the Cambridge Mathematical Tripos, but who despite scoring 13% higher than the second top scorer did not receive the honorary title of Senior Wrangler.
ep6Lk TIL in 208 AD the Roman Emperor Septimius Severus died in what is today York while attempting to conquer Scotland.
4X4bJ TIL the hill in the Windows XP desktop photo was actually part of a vineyard that had recently been destroyed by a bug infestation.
P1jNg TIL The Tsavo Man-Eaters were a pair of large, man-eating lions in the Tsavo region of Kenya, responsible for the deaths of many construction workers in 1898. The lions' skins were used as floor rugs for 25 years, before being sold to the Field Museum of Natural History in Chicago.
KO5gR TIL of the Battle of the Wabash or St. Clair's defeat. When an American army of 1000 men was slaughtered by a Native American force of near equal strength in 1791. Only 28 men escaped unscathed with a casualty rate of 97%, it remains the largest defeat in American history.