Article with photo of army's new pain-inducing energy beam weapon,


The system uses millimeter waves, which can penetrate only 1/64th of an inch of skin, just enough to cause discomfort. By comparison, common kitchen microwaves penetrate several inches of skin.

The millimeter waves cannot go through walls, but they can penetrate most clothing, officials said. They refused to comment on whether the waves can go through glass.


Which suggests glass reflects or magnifies the beam in some unattractive way.