Cell phones, refrigerators, WiFi and your desk lamp: Just like anything you plug into the wall, they all emit EMFs -- electromagnetic fields that vary in strength and design. Communities are scuttling plans for microwave communication dishes in their neighborhoods, citing health concerns about EMFs. Fairfax is just the latest city to put a moratorium on "smart meters" - which transmit energy information wirelessly. So what are EMFs, and how do they affect us?