"The team of seven researchers at the University of Tokyo has produced a sample sheet of the plastic, which is about the size of a very thin magazine — just one millimetre thick and weighing 50 grams. It can deliver up to 40 watts of power to products on or near it that contain a special 'receiving coil': enough to power a lightbulb or a very small laptop."http://www.nature.com/news/2007/070423/full/070423-11.html
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