Per Stenberg and PhD student Aman Zare. (IMAGE) Umea University Caption This is Per Stenberg and PhD student Aman Zare. Credit Photo: Eshagh Dorafshan Usage Restrictions This photo may only be used in contexts related to this news release 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.