Comment What is changing? (Score 4, Insightful) 156
For it to extract energy from a system, it must be changing *something*. So it runs on humid air, right? What is it doing to the air? How is the air different after being used by this device to generate electricity?
Is it just taking advantage of small fluctuations in energy density over a small area? If so, how could that possibly scale to the level they are talking about?
There must be some sort of energy gradient that this thing is taking advantage of, but of course the article doesn't describe it.
Anyone have any ideas?
