grinding.be » Blog Archive » two ways the gadgets of the future will be powered by your blood

"The yeast-based fuel cell produces around 40 nanowatts of power, compared to the microwatt a typical wristwatch battery might produce ... zinc oxide piezoelectric nanowires that generate an electric current when subjected to mechanical stress. ... harvesting energy from low-frequency vibrations such as the wind or the flow of currents ... powered by simple movements such as walking, or the beating of a heart."