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TIL about Walter White -- no, not the Breaking Bad Walter White -- but Walter Francis White, a Black American NAACP activist who infiltrated hate groups because he was light skinned and investigated lynchings. He was instrumental in setting up the NAACP fund which fought segregation.

VMxbG TIL mathematician Milutin Milanković came up with what is now known as the Milanković theory of ice ages in part thanks to having a lot of free time. At the start of WW1 he was imprisoned in Budapest with the right to work for four years.
oBQRY TIL there are only 15 countries (sovereign states, not dependencies) in the world without official armed forces. Out of these, 12 are islands. Only Andorra, Vatican City, and Liechtenstein are located on mainland. The largest population is held by the Solomon Islands with a little over 650,000.
GAX81 TIL that Michelangelo wrote a poem about how much he hated painting the Sistine Chapel, which translates as such: ‘I’ve already grown a goiter from this torture, hunched up here like a cat in Lombardy (or anywhere else where the stagnant water’s poison).’
loR7N TIL during his reign in the 630s Caliph Umar was the first to appoint police forces to keep civil order.
v1JvD TIL that in feudal Japan, merchants were at/near the bottom of the social hierarchy because they didn't produce goods. Artisans were a step above them because they produced non-essential goods and peasants were above artisans because they produced food.