Dr. Havas’ meets the Graham/Stetzer filters
Dr. Magda Havas of Trent University has done several excellent studies regarding the health effects of dirty electricity (high frequencies accompanying the 60 Hz. from your electric utility company).
She has written an account of her first experience with the filters. She was skeptical, but open-minded. The results surprised her and launched her into ongoing research.
You can download one of her papers on the resources page of this Web site.