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TIL three NASA astronauts once staged a "mutiny" in space during Apollo 7 by turning off radio communications for several hours in protest over working conditions. They were never allowed in space again.

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oJ1R TIL Louis Braille, inventor of the system of reading and writing for use by the blind or visually impaired, created the raised-dot system by using an awl, the same kind of implement which had blinded him at the age of three.
kAn4 TIL that North Korea’s national animal is the Chollima, which is a mystical winged flying horse.
rRM6M TIL of Parrondo's paradox. In Game A you lose $1 each turn you play. In Game B you count how much you have left; if an even amount you win $3 else you lose $5. Begin w/ $100. Play Game A or B & you'll lose all in 100 turns. But try Game B followed by A, then B etc & you'll win $2 every two games
oBYjL TIL that for Cleopatra, the time of construction of the pyramids in Giza is more remote than our present day.
1am18 TIL: The airspeed velocity of a (European) unladen swallow is about 24 miles per hour or 11 meters per second.