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TIL - Most Dental drills are air-turbine powered and can reach speeds of 800,000 rpm

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xLR0 TIL of Shavarsh Karapetyan, a world champion swimmer who after finishing his routine 12 mile run heard a bus crash into a lake. He then swam down 33 ft and one by one saved 20 passengers. After receiving multiple wounds, he was in a coma for 46 days, which subsequently ended his professional career.
b9JQ7 TIL - between the 4th and 5th century, ancient Athens adopted Ostracism, a (check and balance) system that allowed the citizens to vote to exile and banish anyone deemed a threat or tyrant for ten years. The ostracism was only considered valid if the total number of votes counted to at least 6000
WvRY TIL that a StingRay tracker mimics a wireless carrier cell tower in order to force nearby phones & cellular data devices to connect to it then it can extract & write to metadata on your device and an operator can conduct specific surveillance operations on just the target device; and it’s legal.
v1L1D TIL R2D2 was controlled by a man inside its body; Kenneth George Baker was an English actor and musician. He portrayed the character R2-D2 in the Star Wars franchise and also appeared in The Elephant Man, Time Bandits, Willow, Flash Gordon, Amadeus and Labyrinth.
e0MGJ TIL of The Eleusinian Mysteries: Secret religious ancient Greek rites held annually for some two millennia (starting in 1600 B.C.) at the temple of Demeter. To this day, the controversy puzzles historians; all details were marked by a sworn oath of secrecy by the initiated and vanished through time.