Rolling robot composite (IMAGE) Max Planck Institute for Intelligent Systems Caption HEXEL modules drive a robot which rolls through sand. Credit Zachary Yoder / MPI-IS Ellen Rumley / MPI-IS Usage Restrictions none License Original 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.