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As a tribe expanded and grew more prosperous, village elders and priests might educate the children while the healthy adults gathered food, built stuff and made war. Eventually a wealthy society might have formal
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Humans learn things, and civilization results. Obviously education has been around as long as mankind has. Through most of history, it was an informal affair, parents teaching their children the skills they needed to know to survive and be productive (household chores and hunting expeditions and dodging barbarians and so forth).