CU-Bolder Graduate Student Carl Bern (IMAGE) University of Colorado at Boulder Caption CU-Boulder graduate student Carl Bern samples canopy foilage in Costa Rica as part of CU-Boulder study. Credit Image courtesy CU-Boulder Usage Restrictions Image is in the public domain 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.