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TIL about a slave named Pertinax who became the emperor of Rome. His dad had a wool business that got their family out of slavery and Pertinax went on to become a commander in the Roman military. He was a very good leader and became the successor to Commodus after his untimely assassination.

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neoa9 TIL For every mile traveled, motorcyclists have a risk of a fatal accident that is 35 times higher than a car driver.
N7x8E TIL HMS Victory is the world's oldest naval ship still in commission, with 242 years' service. She has been the flagship of the First Sea Lord since October 2012. Launched in 1765 she has 104 guns and takes a crew of 850 men.
gM9ny TIL that philosopher Voltaire said, "Canada is a country covered with snows and ices eight months of the year, inhabited by barbarians, bears and beavers. "
JOGv TIL that a man who was kept in a state mental hospital against his will for 15 years sued the state for loss of liberty. His case went all the way to the Supreme Court and marked the beginning of deinstitutionalization of mental asylums in the U.S.
wLLW1 Because most early rotary engines turned counterclockwise (from the front, clockwise from the pilot's view). The physics of rotating objects resulted in left turns being easier than right turns. That led to standard manoeuvres using left turns. And that resulted in the prime/most experienced pilot sitting with a view out of the left window, once airplanes grew large enough to have side-by-side pilots.