Wooller_tusk.jpg (IMAGE) University of Alaska Fairbanks Caption Mat Wooller, director of the Alaska Stable Isotope Facility, kneels among a collection of some of the mammoth tusks at the University of Alaska Museum of the North. Credit Photo by JR Ancheta, University of Alaska Fairbanks Usage Restrictions Credit photographer License Original 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.