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TIL Plato wrote of the Ring of Gyges: A shepherd found a golden ring in a tomb in a cave, pocketed it, realized it could make him invisible, used it to seduce the queen, commit regicide, and become the new king.

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oB0Z7 TIL that to tell how old sharks are, they count the rings in the vertebrae
vkK7 TIL a German power washing company donates its cleaning services to monuments around the world, including Christ the Redeemer, the Seattle Space Needle, and Mount Rushmore. Besides being a nice philanthropic venture, this has helped them develop new techniques as they work on abnormal monuments.
Ra99 TIL That the Greeks believed male sperm was the source of courage, and hence practiced Pederasty, a sexual relationship between an adult mentor and a teenage boy, with the permission of the boy’s father.
6En9J TIL of Robert Maheu, an American businessman and lawyer, who worked for the FBI and CIA, and as the chief executive of Nevada operations for the industrialist Howard Hughes. He recruited the mob to assassinate Fidel Castro and his investigative agency was a model for television's Mission Impossible.
pLVZ TIL that the phrase blood is thinker than water, a phrase that promotes family ties over friendships, originally meant the opposite. The full phrase is “The blood of the covenant is thicker than the water of the womb.” Meaning blood shed in battle bonds soldiers more strongly than genetics.