"The point in prehistory when our early ancestors first picked up a sharp-edged stone to butcher animals has been pushed back one million years with the discovery of ancient bones." The Independent's Science Editor reports that the new discovery will force scientists to reevaluate what we know about our own evolution: "Scientists working at an archaeological site in Ethiopia have discovered two animal bones with the distinctive cut marks of stone tools that the researchers believe were used to scrape or slice chunks of meat from carcasses some 3.4 million years ago. ... 'This find will definitely force us to revise our textbooks on human evolution since it pushes the evidence for tool use and meat-eating in our family back by nearly a million years. These developments had a huge impact on the story of humanity,' said the expedition's lead scientist."