Global life expectancy has more than doubled in the past 200 years.
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The Triassic period marked the first appearance of dinosaurs.
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The Magna Carta was signed in 1215.
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The Dust Bowl of the 1930s caused severe agricultural damage in the United States.
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The Magna Carta influenced later democratic principles.
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The Great Wall was built over multiple dynasties.
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The first successful heart transplant was performed in 1967.
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In 1848, a false report of gold in North Carolina briefly triggered excitement before the California Gold Rush.
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The Sumerians developed one of the earliest known writing systems.
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