Alan Wanamaker, Iowa State University (IMAGE) Iowa State University Caption Iowa State University's Alan Wanamaker studies Atlantic clam shells for clues to the ocean's past. Credit Photo by Bob Elbert/Iowa State 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.