The smallest beams and gamma rays can pass through the single layer. I can concentrate much better with two and will move up to three layers tomorrow. Remember the beams can be used to really mess you up. Pure bottled water and tin foil may save you. Hope President Obama has got the word. Note that Pelosi wears nothing and consider that frenzied expresession and jerky movement. We have far too much beaming going on. It triggered the Twin Tower incident and most else. Humans with wet brains cannot handle the microbursts from satellites and agents stalking you inside their black vans. Just look outside, they are always around. Most of the answers on here hint about all this. Coded works and phrases around the clock. Never use your PC without your hat. There are special welders googles that help protect you, too.