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TIL that the mirrors required for the production of advanced microchips are so flat that if scaled to the size of Germany the highest point will only be a tenth of a millimeter. Because of that the German technologies company "Zeiss" is the only one in the world able to produce these mirrors.

Read more zeiss.com

via reddit.com

LQO0m TIL that the Simpsons episodes "The Curse of the Flying Hellfish" and "Burns, Baby Burns" were originally conceived as a single episode where Grampa and Mr. Burns are revealed to have fallen in love with the same woman while they were fighting in World War II, and the woman had a love child.
NXYpN TIL of the Bladderwort, a carnivorous plant that captures small aquatic organisms by having miniature bags that suck in prey
5YM7k TIL about Jane X. Lee who, as a graduate student, discovered the Kuipler asteroid belt, together with David C. Jewitt, whom she asked for material for her PhD project and thus began the search.
l0OV TIL The cannons used in Human cannonball shows are not really cannons but catapults. Fireworks and gunpowder is used to trick people.
Y7XeB TIL that the world's oldest operational electric railway is Volk's Electric Railway in Brighton, and it dates back to 1883