Marta Shocket (IMAGE) Indiana University Caption Marta Shocket, a Ph.D. student at IU at the time of the study, collects samples on a lake in Greene-Sullivan State Forest in southern Indiana. Credit Courtesy Indiana 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.