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12 Children Who Changed the World

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12 Great Moments That Changed Internet History

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12 Incredible Facts about the US Civil War

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12 Marine Animals Back from the Brink

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12 Super-Dangerous Animals You Need to Know

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12 Things to Know about Wild Weather

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Ancient History of China

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Art and Architecture of China

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China Under Reform

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Classical Civilization: Greece

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Classical Civilization: Rome

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Dive for the Goal Line

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Early River Civilizations

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Famous People of China

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Fierce NFL Rivalries: 12 Super-Charged Matchups

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Food and Festivals of China

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Medieval Europe

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