Today I found an online article which suggests that in the near future, iPods, phones and laptop batteries could be charged by simply walking and jogging.
"The researchers think that with in four or five years, we will be able to recharge a cell phone or laptop battery after even a short walk, if piezoelectric nano wires are woven into a cotton shirt or placed in a shoe heel."
Scientists have already developed a gadget powered by piezoelectric materials, by packing 20,000 nano wires into three square centimeters. These materials create a small electrical charge when pushed or pulled, meaning electricity is generated with every step.
http://living.oneindia.in/men/gadgets-gizmos/2010/run-charge-ipod-260410.html
... a friend also pointed this out to me:
http://www.youtube.com/watch?v=GfPJeDssBOM
But I'm not convinced as yet!
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