R2R WATCH Study Hikers (IMAGE) DOE/Sandia National Laboratories Caption Two hikers focus on the cognitive tests as part of the R2R WATCH study by Sandia National Laboratories, the University of New Mexico and the National Park Service. Credit Michael Padilla Usage Restrictions None 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.