Jet Powered Cell Phones

And they might help keep you warm in the winter:

Though the turbine�s blades span an area smaller than a dime, they spin at more than a million revolutions per minute and are designed to produce enough electricity to power handheld electronics. In the foreseeable future, Epstein expects, his tiny turbines will serve as a battery replacement, first for soldiers and then for consumers. But he has an even more ambitious vision: that small clusters of the engines could serve as home generating plants, freeing consumers from the power grid, with its occasional black- and brownouts….
Epstein�s immediate goal, however, is to use these miniature engines as a cheap and efficient alternative to batteries for cell phones, digital cameras, PDAs, laptop computers, and other portable electronic devices. The motivation is simple: batteries are heavy and expensive and require frequent recharging. And they don�t produce much electricity, for all their size and weight.
On a per watt basis these things apparently will be smaller and more efficient then comparable fuel cells. But they do have a bit of an exhaust issue.
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