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TIL every time Io passes into Jupiter’s shadow, Io’s atmosphere freezes solid and smashes into the surface. When Io moves back into sunlight, the frozen atmosphere thaws and returns to a gas.

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d8Yad Today I learned birds do not sleep in their nests.
RJRw TIL The military once used “dazzle” camouflage. The purpose was not to hide the ships from sight, but to use certain patterns to disorient enemy gunners.
DQ9aV TIL about Lena Zavaroni, a Scottish singer who was the youngest person in history to have an album in the top 10 of the UK Albums Chart at the age of 10, when she also performed with Frank Sinatra. She sadly died at the age of 35 from pneumonia following an operation to cure her depression.
OZ5X TIL that an ancient Greek philosopher called Crysippus died of laughter while watching a drunk Mule try to eat from a fig tree
1aR8r TIL that just about 90 years ago, humans believed that there's only one galaxy (ours) that's surrounded by infinite dark space. Today we know there are at least 400 Billion galaxies, some visible to the naked eye.