Read about the video at:http://www.youtube.com/watch?v=s0qU2ov2U1w&feature=g-all-lik
The use of wi-fi has become widespread and is present in areas where we don't even know it is being used. The effects of Electromagnetic Radiation on humans is a controversial subject and there is much evidence that the radiation can harm certain individuals that are sensitive to it. It may be that it affects all humans to some degree and we still don't know if electro-smog has long term effects on the human body. It's best to be safe when it comes to EMF!