Nickel-hydroxide Actuating Material (IMAGE) The University of Hong Kong Caption Professor Alfonso Ngan and Dr. Kwan Kin-wa introduce the new actuating material powered by light. Credit @The University of Hong Kong Usage Restrictions Please credit "The University of Hong Kong" when using the image 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.