Marie Curie's notebooks are still so radioactive they're kept in lead-lined boxes and require signed waivers to view.
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Ancient Rome built extensive road networks.
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The 1931 China floods are among the deadliest natural disasters in history.
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The Sumerians developed one of the earliest known writing systems.
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COINTELPRO was an FBI program aimed at monitoring and disrupting political organizations.
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The Ice Age saw fluctuating climate conditions.
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Some early mammals coexisted with dinosaurs.
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