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Human power may replace batteries

Energy from the human body may only generate small amounts of electricity but scientists think that is potentially enough for a large range of uses.

At universities around the world clothes are being tested as electricity generators, either by their movement or the temperature of the body.

For example, a vest could potentially power medical sensors that relay wirelessly blood pressure and other symptoms back to a doctor or hospital.

Making the clothing truly responsive to body movement is a challenge. Others are working on knee brackets to allow power generation as soldiers march or run.

Scientists are also using piezoelectric devices to generate power from the bounce of a rucksack.

Even buildings that consume power could one day take monitoring feed-back directly from the humans inside and cut the bill.