Kaaren Mathias, Umea University (IMAGE) Umea University Caption This is Kaaren Mathias. Credit Lena Mustonen/Umeå University Usage Restrictions Lena Mustonen/Umeå University 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.