Stone Tool Discovery Fills Gap in Ancient Chinese History

To the untrained eye, stone tools look a lot like old rocks. But to an archeologist, stone tool surfaces provide important clues about the technological advancements of their crafters.The history of stone tool making dates back to 3 million years ago. As our ancient predecessors evolved, their tools changed, too. And a more complex toolmaking style, known as the Levallois technique, emerged in Africa and Europe around 300,000 years ago. Researchers assumed the West introduced this more s