Yahoo CEO Marissa Mayer delivers the keynote address at the annual Consumer Electronics Show in Las Vegas earlier this month. Robert Galbraith/Reuters/Landov hide caption

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Robert Galbraith/Reuters/Landov

Students Blake Jamar (from left), Ryan Clifton and Gregory Gonzales take apart a bicycle that generates electricity at Analy High School in Sebastopol, Calif. Jon Kalish for NPR hide caption

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Jon Kalish for NPR

What's The Big Idea? Pentagon Agency Backs Student Tinkerers To Find Out

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