A monk had once written over a book that contained information about calculus that was written by Archimedes in ancient Greece that could have made us 100 or even 1000 years more mathematically and technologically advanced.
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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.
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Chunosuke Matsuyama, a Japanese Seaman, sent a message in a bottle in 1784 that his ship had wrecked. It washed up in 1935 in the village where he was born.
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There are pictures of Knights fighting Snails in old Medieval manuscripts - and nobody knows why.
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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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