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Enough Power for a Prosthetic Arm, an Insulin Pump or Even a Cell Phone

In a lab at Simon Fraser University in Canada, volunteers walked on a treadmill with tiny generators mounted on their knees. Every time they took a step, they created a small amount of electricity by flexing a joint on the generator. The result: about five watts of power — which may not sound like much, but it's 10 times as much as you need to power a cell phone. Or maybe, say makers of the generator, the device could be used by a diabetic to run an insulin pump. Perhaps a person who's... Full Story
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