The asteroid impact linked to dinosaur extinction occurred about 66 million years ago.
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The first flowering plants appeared during the Cretaceous period.
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The Aztecs built the city of Tenochtitlan on a lake.
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Ancient Rome had a complex system of aqueducts.
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Prehistoric climates were often warmer than today.
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The shortest war in recorded history lasted less than an hour.
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In 1919, the Boston Police Strike left the city without law enforcement for days.
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The Berlin Wall fell in 1989.
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The Year Without a Summer in 1816 followed a massive volcanic eruption in Indonesia.
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