There's an urban legend that's been floating around for years claiming that the radio waves from mobile phones can cause brain cancer. Actually, I wouldn't be willing to fully put the 'urban legend' stamp on that claim... it seems like there may be a few elements of truth to it. But anyway, now some people are going to the opposite extreme, arguing that not only do mobile phones not cause brain cancer, but that they actually help the brain work better and make you smarter. How? Because the phones held next to your head act like little radiators and, according to David Butler, "that heating effect actually improves the neuron transfers between neural pathways, and therefore your thinking ability goes up". Amazingly enough, Mr. Butler doesn't work for a phone company. He's the head of the National Confederation of Parent Teacher Associations in Britain. But the BBC quotes many experts who completely dismiss Mr. Butler's strange argument.