Dental Calculus (IMAGE) Max Planck Institute of Geoanthropology Caption Milk proteins preserved within tooth tartar have provided the earliest direct evidence of dairy pastoralism in Mongolia. Credit Christina Warinner Usage Restrictions This image may only be used in the context of reporting on this publication and with appropriate credit information. 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.