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TIL about the Mercury 13 - a group of women in the early 1960's that passed the same vigorous tests as male astronauts and was part of a privately funded project that aimed to send them to the moon

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VM8Yp TIL researchers asked four people to do random acts of kindness for others. Not only did it improve their own mood, but caused those strangers to be kinder to other people too. There is a ripple effect to kindness.
j6npn TIL of the 1963 Children's Crusade in the US, when more than 1,000 students marched in the fight for Civil Rights. Most of them were teenagers, but some were as young as six years old, at least 600 were taken into custody.
OoEVg TIL World Record Breaking Waterslide Decapitated a 10 Year Old Boy.
LwWr TIL of the 4,500 troops in the British army who were retreating from Kabul to Jalalabad in 1842, the only one who made it back uncaptured was assistant surgeon William Brydon. When asked upon his arrival what happened to the army, he answered, “I am the army.”
QpYd TIL that helium, when cooled to a superfluid, has zero viscosity. It can flow upwards, and create infinite frictionless fountains.