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History and prehistory | The Origin of Humans and Human Societies | World History | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now: https://www.khanacademy.org/humanities/world-history/world-history-beginnings/origin-humans-early-societies/v/history-and-prehistory How do we know what we know about prehistory, the time before the invention of writing? Sal explains. Practice this ...
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