Introduction
I’m writing this on a computer connected to the internet by means of a wireless modem. The ceiling fan above me is rotating softly, keeping the edge off the heat. Mounted on the wall to my right is a compact fluorescent lamp, its bluish-white glow illuminating the room. A cellphone rests on the edge of the bookcase. Each of these devices—and many others in my home—emit electromagnetic (EM) radiation within a certain portion, in some cases multiple portions, of the EM spectrum.
Just as ancient man learned to harness fire, using it to cook food, provide lighting, and keep warm, so did modern man learn to harness EM energy. Today we cook our food in electric ovens, use electric lights, and heat our homes with electric heaters. We live ...
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