There are many different theories on how electromagnetic radiation interacts with our bodies, but pulsed microwave radiation, such as that used by Wi-Fi and mobile phones, is thought to affect the body's cells in a unique way.
Although microwaves oscillate (change direction) many thousands of times each second, the carrier pulses which convey your voice or emails along the signal actually oscillate at a much slower rate, only hundreds of times a second. This slower rate allows the pulses to interact with protein vibrational receptors, like microscopic hairs, on the membranes of our cells.
The cells interpret this unusual stimulation as a foreign invader and react as any organism would â€" by closing down the cell membrane. This impairs the flow of nutrients into the cell or waste products on their way out. It also disrupts inter-cellular communication, meaning that clusters of cells that form tissues can no longer work as effectively together.
The increase of trapped waste products can lead to an increase in the number of cancer-causing "free radicals". Worse still, a chemical known as "messenger RN" inside the cell passes on this "learned response" to daughter cells, meaning that the cell's offspring also learn to interpret microwaves as an external threat and react in the same way.