upper skull of a green iguana (IMAGE) Johannes Gutenberg Universitaet Mainz Caption Upper skull of a green iguana: The µSurf confocal microscope in the background can be used to detect traces left by nutrition on tooth surfaces. Credit photo/©: Daniela Winkler Usage Restrictions Credit must be given to the creator. Only noncommercial uses of the work are permitted. No derivatives or adaptations of the work are permitted. License CC BY-NC-ND 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.