Genghis Khan's empire covered 24 million square kilometers — the largest contiguous land empire in history.
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The Mongol Empire became the largest contiguous land empire in history.
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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 Byzantine Empire preserved much of ancient Greek and Roman knowledge.
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The Rosetta Stone was discovered in 1799.
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In 1978, thousands of people gathered to watch a man attempt to fly using homemade wings.
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In 1518, a dancing plague reportedly caused people in Strasbourg to dance uncontrollably for days.
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In 1983, a Soviet officer refused to report a false missile alert, potentially preventing nuclear war.
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Ancient Rome had a complex system of aqueducts.
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