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TIL that "Blackboard Bold" (the style of writing used to represent number sets in maths, e.g. ℕ, ℚ, ℝ, or ℤ) only first emerged in the 1950s due to people "double striking" letters on a typewriter to make them bold. It subsequently got into maths in the 70s and onward.

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ADGVw [TIL] A 2013 Spanish study found that Helvetica, Courier, Arial and Verdana were the best fonts for dyslexics, as well as lightly colored paper, 12-14 point sans serif font, and bolding of text for highlighting.
Yp9Ex [TIL] that in 2012, the rapper Pitbull actually showed up and performed at an Alaskan Walmart after an online contest was flooded with votes to send him to the most remote Walmart store in the U.S.
5YQnP TIL That the Allies secretly built two entire portable harbors in the UK and towed them across the English Channel right after D-Day to attach to the just-captured beachheads. One was damaged in a storm. The other landed over 2.5 million men, 500,000 vehicles, and 4 million tons of supplies.
XELX8 TIL Henk Rogers just went to Moscow and tried to buy the rights for Tetris from the Soviet Union. When Rogers arrived at Electronorgtechnica his translator refused to go inside as going to a government agent without proper paperwork was unthinkable. Rogers went in anyways and got rights to Tetris.
97mp TIL a former slave ship captain wrote the song “Amazing Grace.”