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The Solar Impulse 2 plane is seen on the tarmac before taking off at Chongqing Jiangbei International Airport, to fly to Nanjing in Jiangsu province, April 21, 2015. Pilots Bertrand Piccard and Andre Borschberg are taking turns at the controls of Solar Impulse 2, which began its journey in Abu Dhabi in the United Arab Emirates on March 9, as it makes its way in the first round-the-world solar-powered flight in about 25 flight days at speeds of between 50 kph and 100 kph (30 mph to 60 mph). (Photo by Reuters/Stringer)
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