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TIL Louis XI of France once pardoned a man sentenced to death on condition that he serve as a guinea pig for a gallstone operation.

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JJol TIL that one of the first people to be killed by a robot was Kenji Urada, a Japanese engineer working at a Kawasaki Heavy Industries plant. While working on a broken robot, he failed to turn it off completely, resulting in the robot pushing him into a grinding machine with its hydraulic arm.
5V1ZQ TIL during a remodeling project, engineers in China moved an entire bus terminal weighing a total of about 30k tons using hundreds of hydraulic jacks and rolling tracks.
Gbyg TIL that pleasant earthy smell after rain is called Petrichor and occurs due to the soil absorbing and then releasing oils from certain plants.
JYpll TIL that colors change with under water depth, turning gray as denser water absorbs more frequencies quicker.
V1wm TIL that Cleopatra was Greek, not Egyptian