The M29 dairy sample (IMAGE) Chinese Academy of Sciences Headquarters Caption The Bronze Age dairy remains (aged about 3500 BP) from tombs M29 of the Xiaohe cemetery Credit Copyright: PING Wanjing, Institute of Vertebrate Paleontology and Paleoanthropology, Chinese Academy of Sciences Usage Restrictions News organizations may use or redistribute this image, with proper attribution, as part of news coverage of this paper only. License Original 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.