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TIL The “magic number” of people needed to create a viable population for multi-generational space travel has been calculated to about the size of a small village - 160.

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YpAOx TIL of Iranian painter Mohamed Sciddel who was commissioned to paint murals in the main church in Uruapan, Michoacán and decided to live the rest of his life in Mexico to promote art in the region after being exiled from Iran following the 1979 revolution
loAg1 TIL goldfish have a memory span of at least three months, can recognize their owners, and can be trained to do tricks. Goldfish can also see ultraviolet in addition to red, green, and blue making them tetrachromats.
x6e8B TIL the reason the Chicago World’s Fair buildings don’t exist anymore is that they were made of [fortified] Plaster of Paris
GY4x5 TIL The shape of California's state highway signs is meant to represent the spades/shovels used by the miners during the Gold Rush.
OGLBX TIL that Midnight Oil's landmark hit 'Beds Are Burning' was written to criticise the forced removal of Aboriginal Peoples from their ancestral lands.