Pierre Jaquet-Droz, a watchmaker, 240 years ago invented a robot that could write, and the parts could be interchanged to say whatever you want.
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Leonardo Da Vinci predicted the mass use of solar energy as long ago as 1447.
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No one knows who designed the first American Flag.
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In Ancient Egypt, some people paid their taxes in honey.
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In 1799, a boy found a 17lb. rock in a creek in North Carolina and used it as a doorstop. It was actually gold.
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During the Black Plague, it was thought that bad smells were the cause of the plague. "Plague Doctors" therefore wore masks with long beak-like noses stuffed with flowers or smoke to hide the smells.
19
The great wall of China is 1,400 miles long!
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