Window on the Past (IMAGE) Harvard Medical School Caption Field workers excavate ancient human remains at Man Bac, Vietnam, in 2007. DNA from skeletons at this site was included in the current study. Credit Lorna Tilley, Australian National 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.