Weidong Xu, Linköping University (IMAGE) Linköping University Caption This is Weidong Xu in the laboratory at Linköping University. Credit Thor Balkhed Usage Restrictions In connection with news about their findings 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.