North Atlantic Dahliagram (IMAGE) Washington University in St. Louis Caption Dahliagram time-series modeling human movement in the North Atlantic region over the past ~1500 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.