The ancient Egyptians developed a 365-day calendar.
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In 1809, two countries declared war and then forgot to sign a peace treaty for years.
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The marathon race commemorates a legendary run in ancient Greece.
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The Great Emu War of 1932 involved Australian soldiers attempting to reduce emu populations.
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In 1518, a dancing plague reportedly caused people in Strasbourg to dance uncontrollably for days.
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The Ottoman Empire lasted for more than six centuries.
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In 1812, an earthquake along the Mississippi River temporarily reversed the river's flow.
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The first Winter Olympics were held in 1924.
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The Industrial Revolution began in Britain.
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