Kristian Pietras, Lund University (IMAGE) Lund University Caption This image shows researcher Kristian Pietras. Credit Lund University / Kennet Ruona Usage Restrictions Credit: Lund University / Kennet Ruona 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.