Solar Impulse 2 (Si2) aircraft took off early this morning from "Kennedy Airport", New York, to attempt the crossing of the Atlantic Ocean and prove that an efficient energy future is possible. Si2, the solar airplane of Bertrand Piccard and André Borschberg, capable of flying day and night with no fuel, is expected to land at the Seville Airport in Spain on 23 June. The flight, that should take four...