Lewis Borck (IMAGE) University of Arizona Caption This is Lewis Borck, lead study author and PhD candidate in the University of Arizona School of Anthropology. Credit University of Arizona Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. 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.