Natural radiation from the cosmos (gamma rays), the sun (visible light, ultraviolet [UV], and short infrared), terrestrial sources (rocks, soil, etc.), and our bodies (which contain radioactive potassium isotopes) are all examples of radiation that does not produce adverse bioeffects. In fact, natural radiation is vital to health and sustaining life. Artificial or man-made radiation, however, is detrimental to health. Although a large portion of the population is convinced that only ionizing radiation poses a risk, non-ionizing electromagnetic waves can be just as deleterious.