Lately, a lot of reports have been flying around, still unconfirmed, as the experts will tell you, about electric and magnetic fields and perhaps other forms radiation being dangerous to your health. You could get antiradiation screens to combat this but they only work on electric fields at the forementioned frequencies but it is the magnetic field that seems to be the culprit for all the health concerns. Not to say that electric fields are by no means non-hazardous as the current controversy over the above ground electric power lines will contest or the sleepiness in subways that is thought to be caused by the third rail electric field. The type of health concern is not one of catching a cold due to these fields but disruption on the molecular level and the disprution of DNA reproduction causing mutations or cancer. Let's take the brain, the brain is composed of millions, perhaps billions, of neurons.
Neurons work by electrical stimulus.
Imagine passing a very strong field say in the subway and now imagine on the neuron level. The field will have a profound affect on the stimulus of these neurons either activating them or dulling them which brings me back to the sleepiness a lot of people seem to suffer when they get into the subway. This is all from two types of Wavelengths on a spectrum and they should be a great cause of concern for all. Right at this minute, thousands of waves are passing thru the body from radio and t.v. transmissions and thousands of others sources. Not that I want to cause worldwide panic but it does make one wonder.