Solar Impulse 2 launches its first solar-powered flight around the world

André Borschberg and Bertrand Piccard are going around the globe again. They first flew across America in their solar-powered plane two years ago. This time, they are flying an improved design, the Solar Impulse 2, around the world. They are taking off from Abu Dhabi today and fly around the world. It was initially supposed to launch in February, but …