Ali Hajimiri has spent a decade researching how to put solar panels in space and beam the energy down to Earth. Yet when the Caltech electrical engineering professor talks about his work, people always have three questions, usually in this order: Why not just put solar panels on Earth? Are you going fry birds in the sky? Are you building a Death Star?
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Hajmiri jokes he plans to have the answers printed on a card. “I’m going to have it in my wallet to show people,” he said.
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