An assemblage of tools found in Tanzania that was fashioned about 1.5 million years ago from the limb bones of elephants and hippos reveals what scientists are calling a technological breakthrough for the human evolutionary lineage – systematic production of implements made from a material other than stone.
The 27 tools, discovered at a rich paleoanthropological site called Olduvai Gorge, were probably created by Homo erectus, an early human species
