Scientists began to realize that space is filled with invisible regions of energy that exist, unlike gravity, independently of material objects. These fields are what we now call electromagnetic fields, or EMFs. Magnetism and electricity are interrelated, as electricity moves through a conductor, an electromagnetic field is generated. EMFs occur naturally, the earth is enveloped in a static magnetic field, believed to be created by its metallic inner core. The human body itself is electrodynamic, all cells and tissues generate electromagnetic fields.
All electromagnetic energy travels in waves.
The fields generated are commonly measured and quantified in two ways. The human body is naturally accustomed to the earth's static magnetic field. But we are now being continually bombarded by a growing array of man-made EMFs to which we have not adapted. High-tension power lines generate extremely low frequency electromagnetic fields. Video display terminals, another source of worry, fall with the very low range.