Dr Robin Morrison discusses the study (VIDEO) University of Exeter This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Dr Robin Morrison discusses the study Credit Dr Robin Morrison / University of Exeter Usage Restrictions Credit: Dr Robin Morrison / University of Exeter 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.