Cowpox pus was used in the first vaccine which eradicated smallpox.
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In 1954, a woman in Alabama reported being struck by a meteorite fragment inside her home.
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The Roman Republic preceded the Roman Empire.
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The Gulf of Tonkin incident was later shown to involve disputed reports of attacks.
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Dinosaurs ruled the land for over 160 million years.
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The eruption of Krakatoa in 1883 was heard thousands of miles away.
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In 1865, a volcanic eruption in Indonesia affected global weather patterns.
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The Han Dynasty oversaw major developments in Chinese technology.
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