Scientists are learning from the 1700-year-old Lycurgus Cup, which changes colour thanks to nano particles.
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An underwater forest off the coast of Alabama that is 50,000 years old was uncovered by Hurricane Katrina.
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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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The exact cause of death and burial site of Genghis Khan is unknown, because all of the 2000 funeral guests and 800 soldiers were killed in order to preserve the secret.
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The Aztecs were the first to serve chocolate as a drink. They also mixed it with hot chili pepper to make it really 'hot'.
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