[Grut]

...passage through the foil amplified these waves by 20-30 decibels.

Somehow I doubt the physics of this work out. A 2^6 to 2^10 power gain by passing through an unpowered layer?

[baldeagle390]

Yea, as a science teacher I wondered about that too. In the article the researchers said they could not explain the effect. But remember the Feds have alien technology.