A handout picture dated April 21 and made available by Solar Impulse on April 23 shows pilot Bertrand Piccard seen taking a 'selfie' on his flight over Southern China during the 'Solar Imulse 2' flight around the World. The picture was taken on the leg from Chongching to Nanjing, China. Solar Impulse 2 landed in Nanjing late April 21, 2015. The fuel-free aircraft will stay in Nanjing for about ten days before setting off for a Pacific crossing, the most perilous legs in its global journey. [Photo / IC]