The human body is like a giant battery, creating energy all the time. The power to harness that energy for such important uses as powering our iPods is not too far off, now that researchers at the University of Georgia have created prototype nanogenerators. The nanogenerators are made from zinc-oxide nanowires (shown), which create energy when they bend and relax. Since zinc oxide is nontoxic, they could be placed inside the body safely. The generators could be used to power devices within the body, presumably pacemakers and the like. The amount of energy generated by such tiny wires probably isn't enough to power your laptop — or a legion of malevolent machines, no matter what The Matrix might have you believe — but perhaps if you put enough of them in there you could harness enough to juice up your watch.