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Homo erectus, by observing fire in nature, learned to produce it, either by rubbing wood or hitting stones. This represented a mastery of nature, allowing early communities to keep warm, develop language, cook food, and more. These physical and linguistic changes facilitated cooperation and planning in groups. This period, which goes from the first hominids to the discovery of writing, is called Prehistory, a time documented by material remains, such as tools, bones and artifacts, due to the lack of written documents.
