Dr. Anna Weighall Clip (1 of 3) (AUDIO) University of Leeds Your browser does not support the audio element. Caption In this clip Dr. Anna Weighall describes the context of the research and the main findings. Credit University of Leeds 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.