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TIL that the flaw that destroyed Space Shuttle Challenger in 1986 almost occurred on another mission a year earlier. One of the astronauts on the 1985 flight was told that “you came within three-tenths of one second of dying.”

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mxwmP TIL The paint colour Suffolk Pink was first created by adding berries to white wash and also using pig's blood to thicken the paint.
x7Q0 TIL That a few days after the Oklahoma City Bombings, a severed left leg was found in the rubble. DNA evidence showed that it from a victim, Lakesha Levy. When they went to return her leg, it was found that she was already buried with one. It is unknown who the buried leg belongs to.
69WJ7 TIL anyone in the world, any age, can receive a personalized letter from Santa Claus in Canada for free if they write him and mail the letter to: Santa Claus, North Pole, H0H 0H0, Canada. Schools classrooms can get a poster sized letter with all students name on it too.
WB9d TIL that most pictures we see of “old” Einstein are many years after he published anything groundbreaking as his most noteworthy achievements are from his miracle year of 1905, when he was 26
pYE5e TIL that a lot of optimization algorithms are based on the observation of nature (ACO,PSO, genetic algorithms, honeybee algorithms, etc...)