Soft Gripper (IMAGE) Brown University Caption A new hydrogel material is able to respond dynamically to its environment. In the presence of iron ions, the material bends on its own, in this case to close a gripper that can pick up small objects Credit Wong Lab / Brown University 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.