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TIL that a German knight named Gotz von Berlichingen lost his hand in 1504, and had it replaced with a mechanical iron prosthetic. It was capable of grasping everything from a sword to a feather pen.

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YpKBr TIL that both the penny and the nickel cost more to make than they're worth, and that up to 1982 the metal in a penny was worth more than the penny itself.
NeXQ TIL that NASA fastened a 1909 Lincoln penny to the exterior of the Curiosity mars rover for camera calibration purposes. Which means that future space archaeologists are going to be very, very confused
PaKg TIL that California has a larger population than all of Canada.
yQKwJ TIL about 20% of Greenland's population (56,186) have attempted suicide.
RmL1 TIL in 1940 the incredible Antarctic Snow Cruiser was a behemoth vehicle designed to assist Adm. Perry’s Antarctic exploration but was a colossal failure as it could not operate in the snow. It was abandoned and its whereabouts is unknown.