The human body stores as much energy in fatty tissue alone as a one-ton battery. While much of this energy powers our everyday activities, converting any surplus into electricity has recently emerged as a promising alternative source of renewable energy. Scientists and engineers around the world are developing implantable, micro-devices that operate inside living organisms, generating electricity from simple sugars such as glucose. While the technology has yet to reach the market, in 2012, a group of French scientists celebrated a monumental success after implanting one of these promising devices into a mammal. The implications for the medical industry are staggering.
