One of the basic tenets of the Internet-of-Things is a requirement for very little human interaction in maintaining a 24/7 operation – especially a steady, reliable power supply. This requirement is also apparent in devices that are inserted in hard-to-reach places and in small, mobile electronics, such as ultra-thin wireless tags and sensors, and medical devices. People are looking to these for no-fail operation and will depend on them for vital information about their health or environment. ...