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TIL that the vibrator was invented for doctors who suffered from fatigued wrists and hands after giving female patients orgasms in order to treat hysteria

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5YWXD TIL of the Giant Impact hypothesis, where a Mars-sized planet, Theia, is theorized to have collided with Earth 4.5 billion years ago. The debris from both planets eventually coalesced to form the Moon.
Oo6g4 TIL that Pheidippides, the man who inspired the modern marathon, initially ran 150 miles over two days to request help from Sparta before running back. He then ran the 25 miles to the battlefield near Marathon and back to Athens to announce the Greek victory over Persia in the Battle of Marathon
6ELbw TIL the population of the Dusky seaside sparrow was devastated by intentional flooding of Merritt Island to reduce mosquito populations around the Kennedy Space Center. The last known sparrow died in July 1987 at Disney's Discovery Island.
Z8WpB TIL In Italy there is a supervolcano called Campi Flegrei. If it explode the entire Campania will be erased,the world temperature will be lower of several degrees,the ashes coming from the volcano will block the sunrays in the whole world leading to the death of many plants and animals
d8lBK TIL that the Chief of Staff of the Nazi German army in 1944 later became the Chairman of NATO