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Associated Press
Solar Impulse pilots Bertrand Piccard, center, celebrates with Andre Borschberg, right, and Mustapha Bakkoury, president of the Moroccan Agency for Solar Energy upon arrival at Rabat airport, Morocco, Tuesday, June 5, 2012. The experimental solar-powered airplane landed in Morocco's capital late Tuesday after a 20-hour trip from Madrid in the first transcontinental flight by a craft of its type. The mission is being described as a final dress rehearsal for a round-the-world flight with a new and improved plane in 2014. (AP Photo/Abdeljalil Bounhar)

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