Your body doesn't use petroleum (or hydrogen, for that matter) -- why should your car? Today's New York Times has an article about researchers at the Sandia National Laboratory seeking to design and build fuel cells that run on glucose, a basic sugar metabolized by mammalian bodies into energy. Glucose could be used as a fuel for stand-alone gadgets, or drawn from the blood for medical implants or wearable devices. The technology is still in very early stages; the Sandia researchers admit they need to improve the efficiency of their systems by a million-fold.