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TIL prehistoric cave art may have been an early form of cinema. When torch light is simulated at the historic hearth, superimposed images on the wall appeared to move. Rhinos charge, antelope leap and arrows fly.

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8jQP TIL of Rosemary Kennedy. Rosemary grew into a rebellious teen so she was given a lobotomy and turned into a vegetable. During the surgery, she was asked to sing “God Bless America”, which the Doctors used to determine how deep they should cut - “when she began to become incoherent, they stopped.”
GAGVJ TIL: The British Secret Service discovered that semen made a great invisible ink while under the leadership of Mansfield Smith-Cumming. His agents adopted the motto, "Every man his own stylo." They later stopped the use due to the smell and questions about agents' masturbatory habits.
P1eRw TIL about Callon of Epidaurus, who underwent the first recorded sex reassignment surgery in the 2nd century BC and then socially transitioned from a priestess to a man.
p8Rae TIL Kombucha is claimed to treat AIDS, aging, anorexia, arthritis, atherosclerosis, cancer, constipation, and diabetes, but there is no evidence to support any of these claims. Moreover, the beverage has caused rare cases of serious adverse effects, including fatalities.
WbBA TIL of an Irish pirate queen. Grace O'Malley became rich by “taxing” ships passing by her lands in western Ireland, killing those who resisted. She met Queen Elizabeth I but was usually a rebel against English rule in Ireland during the 1500s.