André Borschberg, Co-founder and CEO and Bertrand Piccard, Initiator and Chairman (in the cockpit)  standing beside the cockpit of Solar Impulse 2, the single seater solar airplane with which they will attempt  the first round-the-world solar flight.  Photograph: Jean Revillard/

A solar-powered aircraft that will attempt to fly round the world next March was revealed in Switzerland this afternoon. It will fly day and ni(...)