Last week we reported that the Solar Impulse 2 could be grounded for up to a year if the experimental solar-powered airplane missed its window to take off across the Pacific Ocean. When the June 23 attempt was canceled due to worsening weather forecasts, co-founder Bertrand Piccard lamented via live web feed about the difficulty of making flight decisions with the whole world watching. It was hardly surprising to hear the news, then, that Solar Impulse successfully took off early this morning from Nagoya, Japan. Pilot André Borschberg has embarked on a solo five-day, five-night flight to Hawaii with nothing but the sun to fuel the journey.