Ancestor Human Bones on Display (IMAGE) U.S. National Science Foundation Caption Dr. Roach's study is the first to link human throwing ability and the evolution of our ancestors through hunting. Credit George Washington University Usage Restrictions None License Licensed 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.