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Reaching for Rays

Scientists work toward a solar-based energy system

In the bright blue skies that he enjoys from his academic perch in southern California, Nathan S. Lewis sees the answer to the world's energy needs. "The sun is the champion of all energy sources," says Lewis, a chemist at the California Institute of Technology in Pasadena. "More energy from the sun hits the Earth in 1 hour than all of the energy consumed by humans in an entire year."

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