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TIL about the Davy Crockett - a tripod mounted gun developed by the US during the Cold War. It fired a tactical nuclear warhead with a range of up to 4 miles and a yield that caused fatal radiation within a radius of a quarter of mile

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XQ0Q TIL that by the time you get to the 39th digit of Pi, you can calculate the circumference of the known universe to within the width of an atom.
1ajVO TIL of Ian Manuel. A man who spent years in isolation after he was condemned to die in prison for a nonhomicide offense at age 13. He won his freedom in 2016 with the help of the woman he attacked. He is now an activist, motivational speaker, and published author.
KOAYa TIL that NASA is developing a clockwork rover that uses no electricity to survive the harsh climate of Venus. It's powered by a wind turbine, springs, and gears, and transmits data via a Morse code shutter.
4kBda TIL That Alien Abduction Insurance Exists
GYmQE TIL of two-time Oscar-winner Glenda Jackson, who quit acting in 1992 to join the British parliament. She became a junior minister in the Blair government, and had aspirations to be Mayor of London. In 2015, at the age of 78, she quit politics, reverted to acting, and since won a Tony Award