Wireless or WiFi network uses a radio frequency signal instead of wires to connect your devices - such as computers, printers and smartphones - to the Internet and each other. The WiFi signal can be picked up by any wireless-capable device such as a laptop or tablet within a certain distance in all directions. ALL these devices are emitting radiation, which is now known to cause cancer in humans.

For more info on wi-fi in schools and the harm it is causing click here.