ELECTRO MAGNETIC RADIATION
Electromagnetic radiation is a term used to describe the energy that is coming out from an electromagnetic source. Electromagnetic radiation can be beneficial, harmless or extremely dangerous to humans, depending on the source, level of radiation, and duration of exposure.
There are both natural and man-made sources of electromagnetic radiation. The sun, for instance, is an intense source of natural radiation that can have both positive and negative effects on living things. The sun also produces both visible and invisible electromagnetic streams. Ultraviolet rays from the sun are invisible and cause sunburn and skin cancer if overexposure occurs. A rainbow, however, is a visible and harmless part of the electromagnetic effect caused by the sun, as human eyes detect the visible wavelengths of light as different colors.
Man-made sources of electromagnetic radiation include X-rays, Radio waves and microwaves.
The power contained in electromagnetic radiation can be both helpful and destructive to humans. Overexposure to radiation, whether in an acute dose or a slow, continual intake, can quickly lead to illness and even a painful death. However, as electromagnetic radiation is also a natural part of the human environment, exposure to some radiation is unavoidable.