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TIL it’s proven that no more than four colors are required to color a map so that no two adjacent regions have the same color

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5Yomk TIL there was a baboon named Jack who, for nine years, helped a man with two peg legs switch tracks for trains and never once made a mistake.
P1aZe TIL about “Umuganda,” a national holiday in Rwanda taking place on the last Saturday of every month for mandatory nationwide community work.
XEVDj TIL in the 1880s, the Harvard Observatory director was frustrated with his staff, and would say "My Scottish maid could do better!" So, he hired his Scottish maid. Williamina Fleming ran a team for decades, classified tens of thousands of stars, & discovered white dwarfs and the Horsehead Nebula.
oler TIL That there are plots in porn because it used to be illegal to make pornography without plots in the 90s under the obscenity law
wL45M TIL Martin Sheen's left arm is shorter than other due to an injury during birth. The difference in arm length and range of motion can be seen in his work, especially Apocalypse Now and whenever he puts on jacket in 'The West Wing'.