There is a 600 year old 240 paged book called the Voynich Manuscript, that’s written language is still completely unknown today.
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No one knows how many people died during the sinking of the Titanic.
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Leonardo da Vinci was dyslexic, and he often wrote backwards.
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There's no evidence that pirates made people walk the plank.
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Tickling was a form of torture used in ancient China on nobility because it left no mark and recovery was quick.
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The first coast-to-coast telephone line was established in 1914.
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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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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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