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TIL of the Prince Rupert's Drop, created by dripping molten glass into cold water. Capable of shattering bullets on impact and withstanding the blow of a hammer, this "glass droplet" is characterized by its incredibly high residual stress.

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v1Ll7 TIL The calcium in out bones and the iron in our blood come from ancient explosions of giant stars.
e0MDg TIL that Aboriginal Australian "dot art" where dots and other shapes are used to construct images, while deeply associated with Aboriginal tradition, was only first done in 1971, very recently in the 40,000 year history of art on the continent.
loELa TIL that researchers found fossils of a "Mega Penguin" that stood over 6ft tall and weighed in at over 250lbs.
WmKo TIL Danny DeVito directed, produced, starred in and narrated the 1996 film Matilda
GLkG TIL John Matuszak known as Sloth from “The Goonies” was a #1 Overall Pick in the NFL Draft and won 2 Super Bowls with the Oakland Raiders.