Animated GIF of MAS Vehicle in Action (IMAGE) University of Pennsylvania Caption Rather than a battery, the researchers' metal-air scavenger vehicle gets energy from breaking chemical bonds in the aluminum surface it travels over. The vehicle keeps going until the hydrogel slab it's dragging dries out or the surface is completely corroded, but a freely moving robot could seek out new sources of water and metal. Credit Pikul Research Group, Penn Engineering 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.