JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY JAVIER TRUEBA / MSF / SCIENCE PHOTO LIBRARY
Olduwan stone tools. Hand holding a rock to demonstrate the creation of Olduwan stone tools, in the manner of the oldest tools found at the Olduvai Gorge, Tanzania. The oldest tools here date to around 1.85 million years ago. Olduwan tools such as this were rounded rocks sharpened by a blows that detached a flake, leaving a sharp edge. They are thought to have been first made and used by Paranthropus (formerly Zinjanthropus then Australopithecus) boisei, a hominid that lived between 2.6 and 1.4 million years ago. P. boisei is not considered to be an ancestor of modern humans, although similar tools were made by the human ancestor Homo habilis.
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