Each king in a deck of playing cards represents a great king from history: spades - King David, clubs - Alexander the Great, hearts - Charlemagne, and diamonds - Julius Caesar.
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Ancient Romans at one time used human urine as an ingredient in their toothpaste.
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Contrary to popular belief, the first ironclad warships were built by Korea in the 16th century.
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A baboon called Jackie became a private in the South African army in World War I.
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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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Originally, Du Pont, Inc. was a tiny gun powder mill in New Jersey.
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