Laptop computers have become wildly popular in recent years. Their appeal lies in their portability: the light, compact computers can be taken anywhere, liberating busy people from the confines of their offices. Almost eight million PC laptops were sold in the United States last year, and according to Gartner, a market-research firm based in Stamford, CT, over the next four years, laptop sales will grow at approximately twice the rate of desktop computer sales. Yet the laptop's basic design hasn't changed much since it was created some two decades ago.

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