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TIL of John Leray, a French Mathematician who concealed his proficiency with differential equations to avoid working for the Nazis. While in a POW camp, he developed sheaves, sheaf cohomology, and spectral sequences which are important tools for modern Algebraic Geometry

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nW7G9 TIL: Papua New Guinea, a country in Oceania has one of the worlds highest crime rates.
vP6KD TIL in Singapore, if no one from a race has been president for the last five terms, the election is reserved for that race
bal7 TIL that Jimmy Carter saw a UFO in 1969. He was so impacted by it that he promised to disclose every piece of information about UFO sightings if he became president. However, after being elected, he distanced himself from disclosure, citing “defense implications”.
Zpwev TIL that the late singer Tony Bennett's first encounter with wife Susan Crow was in 1966, when he met her mother and father. Susan's mother was pregnant with her at that time. Bennett was 40 years old.
neWKo TIL In pre-colonial Nigeria there was a city with walls four times longer than the Great Wall of China, and consumed a hundred times more material than the Great Pyramid of Cheops