Flight by Solar-powered plane

The first around-the-world flight by a solar-powered plane will be accomplished by now, bringing truly clean energy to air transportation for the first time. Consumer models are still far down the road, but you don’t need to let your imagination wander too far to figure out that this is definitely a game-changer. Consider this: it took humans quite a few milennia to figure out how to fly; and only a fraction of that time to do it with solar power.