Robert Gess, Wits University (IMAGE) University of the Witwatersrand Caption Dr. Robert Gess from the Wits Evolutionary Studies Institute is excavating. Credit Wits 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.