Cool Running Computers That Can Shift Into Reverse

Computers consume some 5% of the commercial energy used in the U.S., according to the Environmental Protection Agency. That costs plenty. And as computer chips become denser, the electricity surging through their circuits makes them harder and harder to keep cool. Now, some scientists are proposing that an unusual theoretical design called "reversible computing" may help. After performing a calculation, a reversible computer would return to its initial state by running the calculation backward and recovering the charges stored in its capacitors instead of discharging them as excess heat.

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