Swiss pilot Bertrand Piccard takes a selfie with his arm outside the Solar Impulse 2 plane during the 6th leg of their round the world trip, from Chongqing Jiangbei International Airport to Nanjing Lukou International Airport, Jiangsu province in China in this April 21, 2015 handout photograph released by Solar Impulse. (Photo by Bertrand Piccard/Reuters/Solar Impulse)
