Your Watershed Your Backyard (IMAGE) Carnegie Institution for Science Caption A volunteer from GM helps students from Walter P. Carter Elementary School test a stream for macroinvertebrates during a Your Watershed, Your Backyard field trip in fall 2011. Credit Image courtesy Rob Vary 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.