Stretching and Contracting Hydrogel (VIDEO) RIKEN This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption The hydrogel stretches and contracts as the temperature goes up and down, but does not change in volume. Credit Kim et al. <i>Nature Materials</i> Usage Restrictions Kim et al. <i>Nature Materials</i> 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.