It's understandable that content needs to be watered down for accessibility purposes, but this is taking it a bit far. The energy isn't harvested from the "air"

It's understandable that content needs to be watered down for accessibility purposes, but this is taking it a bit far. The energy isn't harvested from the "air", it's harvested from background electromagnetic activity. You could do this in a vacuum. No air required. I wish the artcile had some more specifics on the efficiency of the antennae. Is there something unique about the design outside of the fact that they're printed on paper? For what it's worth, if you've ever used an FM radio, you've "harvested energy from air". The antenna on your FM radio detects fluctuations in radio waves, which are a type of electromagnet field. FM signal output is measured in watts. If you were to put your hand on a powerful RF transmission antenna, you will get burned. That's energy. The key thing to understand is that you're talking about very, very small amounts of energy as you move away from the transmitter. That doesn't appear to have changed here, as they're talking about microwatts. Interesting, but the title strikes me as link bait.