Grass inventory (IMAGE) University of California - Riverside Caption Graduate student Cindy Yañez taking inventory of plant samples mailed in by community scientists for radiocarbon dating. Credit C. Czimczik/UCI Usage Restrictions None License Original 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.