Stone Age
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The Stone Age was a prehistoric period when people primarily used stone to make tools and other implements. It matters because it represents the earliest phase of human technology and culture, laying the foundation for all subsequent human development.
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The Stone Age was a broad prehistoric period during which stone was widely used to make stone tools with an edge, a point, or a percussion surface. The period lasted for roughly 3.4 million years and ended between 4000 BC and 2000 BC, with the advent of metalworking. Because of its enormous timescale, it encompasses 99% of human history.