Solar airplanes have been a useless tour de force up until now. This one is intended to provide internet service to parts of the world that do not have it, such as Africa. This airplane will fly for months.
https://www.youtube.com/watch?v=eOez_Hk80TI http://www.realclearlife.com/2016/08/05/facebooks-dream-of-internet-everywhere-gains-momentum/ Needless to say, this would be far easier and cheaper with cold fusion. - Jed
