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TIL that functioning ‘mechanical gears’ were seen in nature for the first time. Previously believed to be only man-made, a natural example of a functioning gear mechanism has been discovered in a common insect - showing that evolution developed interlocking cogs long before we did.

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PyxO TIL: Mario Party 8 was withdrawn from shelves in the UK because some copies included the word “spastic”, which is considered a highly offensive word referring to disability, the game was eventually re-released with the word replaced with “erratic.”
XYjX TIL that the act of Kinetic Bombardment (firing large metal rods from a satellite into the Earth’s surface at terminal velocity as a weapon) remains legal
G8bG TIL the 1945 Food and Nutrition Board Paper often quoted statement “humans require roughly 2.5 liters (8 glasses) per day” is only ½ of the full statement. The other half was “we get most of the fluid we need from food and other beverages.”
XEDd6 TIL that “mechanical” prosthetics date back to the 16th century when wounded knights would need mechanical fingers to still grip their swords or lance
XEk56 TIL It's possible for cats to be allergic to humans!