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New research finds early human ancestors during the Stone Age were more picky about the rocks they used for making tools than previously thought. The study published Friday in Science Advances shows that by 2.6 million years ago, early humans had developed a method to chip sharp flakes from rocks to use as blades for butchering meat. At an archaeological site in Kenya, researchers found durable blades made of quartzite, then traced the original rock material to locations several miles away. This suggests the early humans had a mental map of where suitable raw materials were located and planned ahead to use them.
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