| About 2.5 million years ago early humans in Africa made the first tools of stone. Scientists call these tools and the technique used to make them Oldowan, after the site of Olduvai Gorge in Tanzania, where many have been unearthed. Oldowan toolmaking involved hitting one palm-sized cobblestone against another. This process created large, sharp-edged core tools capable of breaking bones and slicing meat or vegetation, and smaller flakes that could scrape hides and sharpen wooden sticks. |