Grass Eater Tooth (IMAGE) Johns Hopkins University Caption A field worker shows a fragment of a hominin tooth from Woranso-Mille, Afar, Ethiopia, one of 152 tooth fragments sampled for isotope analysis to find evidence of diet change. Credit Yohannes Haile-Selassie, Cleveland Museum of Natural History 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.