Wireless networks that give you access to e-mail or the Web from anywhere in your home or office are, it seems, becoming ubiquitous. But the electronic receivers that allow laptops and personal digital assistants to pick up wireless data signals are power hogs, reducing the already short battery life of portable computers. University of Southern California electrical engineer Anthony F. J. Levi has developed a receiver that he says could extend battery life as much as tenfold.

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