Ian Craddock, University of Bristol (IMAGE) University of Bristol Caption This is professor Ian Craddock. Credit University of Bristol Usage Restrictions The image is for single use only to illustrate this press release and is not to be archived. 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.