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'Ultimate PC' Would Be a Hot Little Number

A physicist has used the laws of thermodynamics, information, relativity, and quantum mechanics to figure out the ultimate physical limits on the speed of a computer. His calculations show that, in principle, a kilogram of matter in a liter-sized container could be an "ultimate laptop" more than a trillion trillion trillion times as powerful as today's fastest supercomputer--if it could be turned into a black hole.