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TIL that Charles Darwin was one of the first scientists to demonstrate the effects of inbreeding depression, with his own children. Darwin’s wife was his first cousin.

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rNGEM TIL Adélie penguins use stones for building their nests. Based on a 1998 study, media reports stated that a shortage of stones led female Adélie penguins to trade sex for stones. Some pair-bonded female penguins copulate with males who are not their mates and then take pebbles for their own nests.
Axy7 TIL of Snake Island. This island has the highest concentration of venomous snakes, travel requires approval by the Brazilian Navy, and a doctor is required to be present during any trip.
Br97L TIL Coca-Cola did not invent the modern image of the red and white clothed Santa Claus through their famous campaigns of the 1930's. His modern look goes back as far as the 1880's through an illustrator named Thomas Nast.
L1gV Today I learned that there is a real robotics company called Cyberdyne, and they really do make robotic exoskeletons.
b6lpa TIL of Strivers' Row, a district of Harlem, NYC, whose houses were built in the 1890s. The houses sat empty for more than 20 years because at first the owner would only sell to white people, but by the 1920s the area had become the leading district for upper-middle class black families.