Powered only by the sun, the Solar Impulse finished a historical journey across America on July 6. It's creators hope the cross-country trip will inspire innovation on the ground. CBSNews.com's Chenda... more 
Powered only by the sun, the Solar Impulse finished a historical journey across America on July 6. It's creators hope the cross-country trip will inspire innovation on the ground. CBSNews.com's Chenda Ngak reports. less 
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