Science and technology

Associated Press
Solar Impulse pilots Bertrand Piccard, right, and Andre Borschberg, center, check the weather conditions before taking off at Barajas airport in Madrid, Spain, Tuesday, June 5, 2012. The experimental solar-powered airplane arrived in Madrid on May 25, 2012 from Payerne, Switzerland, and now goes on to Rabat, Morocco on its first transcontinental trip. The mission is described as the final dress rehearsal for a round-the-world flight with a new and improved aircraft in 2014. (AP Photo/Alberto Di Lolli)

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