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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The oldest stone tools found are dated from 2.7 - 2.9 million years ago. The species that made these tools is unknown.
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There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
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Leonardo Da Vinci made a robotic lion in 1515 that would walk, sway, open its mouth and move its tail - it even had a compartment that opened to present flowers.
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The last time American Green cards were actually green was 1964.
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During the Gold Rush in 1849, some people paid as much as $100 for a glass of water!
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The U.S. motto, 'In God We Trust', was not adopted as the national slogan until 1956.
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