The promise of nanotechnology will allow us to easily charge our consumer electronics devices as we walk and move. Specifically, US scientists have developed a microfiber that charges devices as the fiber rubs against itself.

This nanogenerator takes advantage of the semiconductive properties of zinc oxide nanowires -- tiny wires 1,000 times smaller than the width of a human hair -- embedded into the fabric. The wires are formed into pairs of microscopic brush-like structures, shaped like a baby-bottle brush.

One of the fibers in each pair is coated with gold and serves as an electrode. As the bristles brush together through a person's body movement, the wires convert the mechanical motion into electricity.

To be truly green, users could use clothes made of such fabrics and even carry a battery with them that charges as they walk. This battery power could be used to power other devices later.

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