Swiss pilot Bertrand Piccard takes a selfie during the last leg of his round the world trip with Solar Impulse 2 prior to finishing the first around the world flight without the use of fuel in 2016. ANP / Solar Impulse / Bertrand Piccard

Swiss pilot Bertrand Piccard takes a selfie during the last leg of his round the world trip with Solar Impulse 2 prior to finishing the first around the world flight without the use of fuel in 2016. ANP / Solar Impulse / Bertrand Piccard