Khan Academy-Prehistoryhttps://www.khanacademy.org/humanities/world-history/world-history-beginnings/origin-humans-early-societies/v/history-and-prehistory?modal=1
https://www.khanacademy.org/humanities/world-history/world-history-beginnings/origin-humans-early-societies/v/history-and-prehistory?modal=1
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