UC Gregory Hydrogel (IMAGE) University of Cincinnati Caption This set of images shows a free-floating hydrogel (2.6 cm in length) moving through water as it shrinks and swells. Credit Photo provided by Jarod Gregory 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.