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