Research Team (IMAGE) Smithsonian Caption Members of the research team, Sean McCanty and Courtney Hofman, excavate an ancient oyster shell midden at the Smithsonian Environmental Research Center in Edgewater, Md. Credit Torben Rick 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.