This story was originally published by The Conversation. Drive through the plains of Iowa or Kansas and you’ll see more than rows of corn, wheat and soybeans. You’ll also see towering wind turbines ...

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Look up in the sky, it's a bird, it's a plane, it's ... a 20,000 cubic-meter power-generating airship, floating 6,560 ft (2,000 meters) above the ground. Introducing the S2000 stratospheric airborne ...