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TIL when President Charles De Gaulle visited Harold McMillan at his home in Birch Grove in 1961, the French Secret Service put a special fridge in the coach house filled with De Gaulle's blood in case of an assassination attempt. A Daily Mail reporter was also bitten on his behind by a police dog.

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W4rB TIL when a city in Indiana replaced all their signaled intersections with roundabouts, construction costs dropped $125,000, gas savings reached 24k gallons/year per roundabout, injury accidents dropped 80%, and total accidents dropped 40%.
Yp6pB TIL that with lifestyle variables eliminated, men's life expectancy is only a year less than women's.
Zp74a TIL shortwave radio is still commonly used for news broadcasts around the world
dv5E TIL of the Stacks Project. It is an open-source textbook with ~4700 pages, made by many mathematicians with the intention of collecting all the prerequisite knowledge required to understand an extremely abstract mathematical object known as ‘algebraic stack’.
Y7RlZ TIL when the word "pussy" popped up in regular dialogue around the sixteenth century, it didn’t have a sexual connotation at all. It was used as a term of endearment to describe women in general and didn’t actually get sexual until the nineteenth century