Measuring Branches (image) University of Arizona Caption Solving a tree puzzle: students measure tree parts for the research study. Credit Photo courtesy of Lisa Patrick Bentley Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. 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.