Calcium Delivery (image) University of California - Berkeley Caption This is an aerial view of helicopter distributing calcium pellets throughout a research watershed at Hubbard Brook Experimental Forest. Credit Credit: Hubbard Brook Research Foundation Usage Restrictions All rights reserved. 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.