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TIL the term "fairy tale" was coined by Marie Catherine d’Aulnoy to describe a collection of stories she wrote released in 1697-98.

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LQvdm TIL As a teenager Bernhard Riemann finished all 900 pages in Legendre's book on the Theory of Numbers in six days. Riemann later challenged what the dimension of real space was and what geometry described real space, ideas too far ahead of its time to be appreciated by most scientists of that time
x6rm5 TIL that some species of Ammonites (a prehistoric cephalopod) reached 1.8 meters in diameter and weighed close to 1500 kilograms
9bdQ TIL that the windshield of the SR-71 Blackbird can reach a temperature of over 600°F during flights at mach 3. It had to be made of quartz and was ultrasonically fused to the titanium hull in order to handle the stress.
x6OKD TIL squirrels will adopt another squirrel's baby if its parents die or are unable to care for it.
4E8b TIL there is a $300,000 watch that doesn’t tell time, but it does tell you whether it’s day or night.