Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
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Recently, archaeologists excavating in the old medieval town of Odense in Denmark uncovered 700-year-old barrels of poop - and, to their surprise, they still smelt.
11
In 1958, a nuclear bomb was lost somewhere along the swampy coast of Georgia. Its whereabouts remain a mystery to this day.
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The last time American Green cards were actually green was 1964.
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The ancient Egyptians thought the function of the brain was to produce snot.
16
Grenades were invented in China over 1,000 years ago.
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Napoleon constructed his battle plans in a sandbox.
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