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a period of time in which early humans made lasting tools and weapons mainly from stone; the earliest known period of human culture
early humans made tools of stone, wood and animal bones; scientists think that the stone age lasted until people learned to use metal for tools
early humans probably discovered fire by rubbing two sticks together or striking stones to get a spark
new stone age
humans discovered that if they planted the seed of wild grasses new grasses would grow; people began to grow their own food
people could live in one place because they could grow their own food; no longer needed to move like nomads
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