I was reading my favorite Photography Blog, Ken Rockwell's Blog http://www.kenrockwell.com It seems as well as a Camera Guru he knows a lot about Electromagnetic Radiation. He Blog's that scientists have finally done the research that conclusively proves that Cell Phone Radiation causes Cancer. Ken says, "WiFi and Bluetooth do transmit real power, transmit on the same 2.4GHz bands more or less as used by microwave ovens, and this radiation is absorbed by human tissue exactly in the same way a turkey heats in a microwave oven. WiFi and Bluetooth don't transmit much power, so they aren't much of a concern. We're happy if Bluetooth gets us a few feet reliably, and I'm ecstatic if WiFi makes it from one side of my condo to the other.
Cell phones operate on these same microwave bands, but the problem is that they have enough power to transmit many miles to cell phone base stations (towers), and worse, that many of us hold cell phones so close that they touch our heads!" here is a link to the Research: http://www.surgicalneurology-online.com/article/S0090-3019(09)00145-1/abstract So, if you are one of those people (like me) that still hasn't made the switch to a hands free device like bluetooth it may be time! B