Sampling (IMAGE) Stanford University Caption Arnold Mathijssen and Manu Prakash examining a sample from the marsh next to Peggy's Bench in the Baylands Nature Preserve in Palo Alto. Credit Kurt Hickman/Stanford News Service Usage Restrictions Image may only be used with appropriate caption or credit 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.