... which is about as practical an observation as the organization (I forget which- was it the skin cancer foundation?) that maintains there is no safe level of

... which is about as practical an observation as the organization (I forget which- was it the skin cancer foundation?) that maintains there is no safe level of sunlight exposure, and that any and all forays outside should be accompanied with large sun hats, full-body clothing and an inch of sunscreen. Technically correct, but so unreasonably stringent as to be pointless, and so lacking in perspective as to be laughable. You cannot escape radiation, and frequently there are benefits that far outweight the risk. See: Bananas, x-rays, airlines, living in Colorado, using a computer, having friends.