MilliMobile (IMAGE) University of Washington Caption Researchers at the University of Washington have created MilliMobile, a tiny, self-driving robot powered only by surrounding light or radio waves. It’s about the size of a penny and can run indefinitely on harvested energy. Credit Mark Stone/University of Washington Usage Restrictions For reuse with appropriate credit 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.