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May 24, 2012: Solar Impulse project CEO and pilot Andre Borschberg gets ready to take off at Payerne airport in Switzerland. The Solar Impulse HB-SIA prototype aircraft, which has 12,000 solar cells built into its 193-foot wings, attempted its first intercontinental flight from Payerne to Rabat, Morocco.

May 24, 2012: Solar Impulse project CEO and pilot Andre Borschberg gets ready to take off at Payerne airport in Switzerland. The Solar Impulse HB-SIA prototype aircraft, which has 12,000 solar cells built into its 193-foot wings, attempted its first intercontinental flight from Payerne to Rabat, Morocco. (DENIS BALIBOUSE / REUTERS)

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JOPLIN, MO - MAY 19:  Grace Goebel plays outside of the new Habitat for Humanity home of her parents that was built on the spot of a home that had been destroyed after a tornado hit the neighborhood almost one year ago on May 19, 2012 in Joplin, Missouri. Tuesday will mark the one-year anniversary of the EF-5 tornado that devastated the town. The tornado left behind a path of destruction along with 161 deaths and hundreds of injuries, but one year later there are signs that the town is beginning to recover.  (Photo by Joe Raedle/Getty Images)

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Hikers watch an annular eclipse from Papago Park in Phoenix on Sunday, May 20, 2012. The annular eclipse, in which the moon passes in front of the sun leaving only a golden ring around its edges, was visible to wide areas across China, Japan and elsewhere in the region before moving across the Pacific to be seen in parts of the western United States. (AP Photo/The Arizona Republic, Michael Chow)

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