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The Abbasid Caliphate becomes a center of learning from the 9th to the 13th centuries, collecting the knowledge of India, China and ancient Greece while also making significant new contributions to mathematics, astronomy, philosophy, medicine and geography.

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World History on Khan Academy: From the earliest civilizations to the modern world, geography, religion, trade, and politics have bound peoples and nations together — and torn them apart. Take a journey through time and space and discover the fascinating history behind the complex world we inhabit today.

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