Solar Impulse HB-Sla

The Solar Impulse solar-powered plane is every green traveller's dream come almost true. It has already demonstrated it can fly day and night without any fuel - could this be the future of air travel?

Stuff says: "Not content with being the first to complete a non-stop round-the-world balloon flight, Bertrand Piccard co-founded the Solar Impulse project to build this - the world's most advanced solar aeroplane and the coolest thing on two wings."