Senior author (IMAGE) University of Massachusetts Amherst Caption Carrie Nobles is an assistant professor of environmental health sciences in the UMas Amherst School of Public Health and Health Sciences. Credit UMass Amherst 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.