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TIL that the mysterious baroque painter Johannes Gumpp is known to have painted only one self portrait which also happens to be a triple self portrait in which he appears from behind painting his own face reflected in a mirror.

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QMrM TIL the Influenza Pandemic of 1918-1919 is known as the most devastating epidemic in recorded world history and that it killed more people in 1 year than during the 4 years of the Black Plague. It was most deadly for people aged 20-40 and many died within hours of contracting the virus.
wogD8 TIL that the world's oldest known prosthetic device is a 3,000-year-old wooden toe found on an Egyptian mummy. The "Cairo Toe" shows signs of wear, indicating it was actually used by its owner during their lifetime, not just attached for burial purposes
6EMeJ TIL about the "multi-dog experiment". In 1968, Demikhov transplanted a puppy’s head onto the neck of another dog. It was the first "two body-one circulation" system. This taboo experiment which was criticized a lot became the founding principle of the modern heart and lung transplant we have today.
ADx0w TIL: Windows specific keyboards have a menu button that lets you right click from your keyboard (Three lines in a square)
OoRaX TIL that botanistic David douglas, after whom the Douglas fir was named, died by falling into a bull pit under mysterious circumstances at the age of only 35. Prior to that he identified over 200 important plant species and is still a hero to botanists today.