Stone flake tools from China. (IMAGE) Dartmouth College Caption A selection of stone flake tools from the Shangshan ((a)-(h)) and Kuahuqiao ((i)–(l)) cultures. Red dots delineate working edge of tools. Credit Image by Jiajing Wang. Usage Restrictions none License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.