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"Scientists at the Georgia Institute of Technology are in the process of developing a nanogenerator, a tiny device which produces energy from flowing blood, constricting blood vessels, or beating hearts. Researchers say that the devices could be used to power implantable biomedical electronics, or might be employed in biosensing, environmental monitoring, and personal electronics. The nanodevices generate power while warm-chillin' in bodily fluids or \"other liquids,\" using ultrasonic waves as their energy source. Now if we can just combine this with the bloodstream bot, our self-powered swarm of robotic terror will be complete.[Via Physorg]"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2007/07/23/nanogenerator-powers-up-inside-your-veins/>