East African Dahliagram (IMAGE) Washington University in St. Louis Caption Dahliagram time-series modeling human movement in east Africa/southern Arabia over the past ~10,000 years. Credit Michael Frachetti/Washington University Usage Restrictions None 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.