Stephan Winkler, University of Vienna (IMAGE) University of Vienna Caption Isotope Researcher Stephan Winkler, University of Vienna, is shown in front of the "Vienna Environmental Research Accelerator" (VERA). Credit Copyright: Universität Wien Usage Restrictions The image may only be used with appropriate caption or credit. 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.