| The first stone tools, made by humans more than 2 million years ago, are called Oldowan tools after Olduvai Gorge, Tanzania, where they were first found. To make these tools, an early human used a hammerstone to strike a large cobblestone called a core. Some of the flakes that came off the core had very sharp edges, making them ideal for cutting into animal carcasses and scraping animal hides. A core with many flakes removed, giving it sharp ridges, was used as a chopper to break open animal bones for marrow. |
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