http://www.youtube.com/watch?v=qI3JnR09cU4&feature=relmfu
I also question the intelligence of those who do. My step-mother who I no longer talk to, is semi-disabled from wearing those infernal things for most of her life. I even told her it was bad for you, but of course the pre-programmed broad just wouldn't change her ways.
Oh well. Not my problem.