The Inca city of Machu Picchu was built without mortar — stones were cut so precisely they needed no adhesive.
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The Ice Age saw fluctuating climate conditions.
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The asteroid impact linked to dinosaur extinction occurred about 66 million years ago.
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The Magna Carta influenced later democratic principles.
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The Olmec civilization flourished in Mesoamerica.
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The Great Emu War of 1932 involved Australian soldiers attempting to reduce emu populations.
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In 1983, a Soviet officer refused to report a false missile alert, potentially preventing nuclear war.
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