Biger Nuur (image) Max Planck Institute for the Science of Human History Share Print E-Mail Caption Ancient lake landforms around Biger Nuur, Mongolia, which is evidence of larger lake sizes in the past. Credit Nils Vanwezer Usage Restrictions This image may only be used in the context of reporting on this publication and with appropriate credit information. Share Print E-Mail 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.