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it through the night. we had to build an aircraft, extremel extremeliener -- extremely energy efficient. size of the 747, the weight not exceeding that of the car. we have to climb to altitude of everest. 2,000 feet every day to store energy. latitude. and recharge the batteries. with this we can go through the night and be still flying. before the morning when the sunrises again to be able to continue. interestingly, in fact, in trusting in fact, what he have is an airplane now which starts to be sustainable in terms of energy. we can fly for months, don't stop. theoretically. the real challenge. is how to make the pilot sustainable. one on board. >> why did you decide to do this? what exactly are you trying to prove here? >> so what we want to show -- is that with this technologies, we