An anonymous reader writes: This article takes a look at the future of electronic devices powered by the human body. From the electric voltage in mammal ears called the endocochlear potential, to body heat, and muscle motion, there are a number of exciting new areas of energy research being explored. Ars reports: "Staying alive guzzles energy. In order to keep us ticking, our bodies need to burn between 2,000 and 2,500 calories per day, which is conveniently enough to power a modestly used smart phone. So if just a fraction of that energy could be siphoned, our bodies could in theory be used to run any number of electronic devices, from medical implants to electronic contact lenses—all without a battery in sight. Recently, researchers have taken important strides toward unlocking this electric potential."