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TIL in 1967, protesters requested a permit to levitate the Pentagon 300 feet in the air, through songs and chants, to exorcise it of its evil and end the Vietnam War. Authorities agreed to only 3 feet.

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v6nR TIL Eyeglasses and Sunglasses tend to cost so much because a company known as Luxottica owns the vast majority of eyewear companies and distributors.
9dJB TIL that as many as 20% of women in 18th century London worked as prostitutes
rR0ne TIL The light pen, a predecessor to modern touch screens, was first invented in 1955 and popular through the 60s and 80s. A light pen detects changes in brightness from the cathode-ray tube and communicates the timing of this event, time and brightness are correlated for position.
EGMX TIL that there are still unexplored passageways in the Great Pyramid of Giza in Egypt.
8ekYP TIL that Inca Ruins in Sacsayhuamán - Peru was built in 14th Century with Limestone blocks those weight vary from 128 to 200 tonnes. These stones were moved from an estimated 22 miles away. Stones are so precisely spaced that a single piece of paper will still not fit between many of the them.