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TIL When quicklime is heated to 2400°C it emits an intense glow. Before the invention of electric lights, quicklime was used as a lighting source for theater productions, and this is where the phrase "in the limelight" when referencing celebrity comes from.

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AN0lx TIL of French Neo-Socialist, Marcel Déat. In May of 1939 he wrote 'Why Die for Danzig' (Mourir pour Dantzig?) urging France to appease Hitler by surrendering to his ultimatum for Danzig. Déat would later act as a collaborator with Vichy France.
xVmeB TIL that your teeth are actually highly-specialized fish scales
YoRW TIL Leonardo Da Vinci sketched a design for an armor-clad robot. A robot was built based on the sketch and was found to be fully functional
Wkk89 TIL the Vatican City has the highest per capita wine consumption of any country in the world.
vP6x7 TIL if absolutely anything happens on a RR crossing, there's a box with a phone number to call to shut down the area