and even from space. it's in our food, in our water, in our teeth. so radiation isn't dangerous in an everyday sense. and there's enormous variation in different parts of the world. >> do you have any numbers just to put that into kind of a context? >> the units are difficult. it's rays and milligrams and all this kind of thing. the numbers are not familiar to people in any way shape or form. if i said to you the mi radioactivity is only 400 more millisieverts that wouldn't mean anything to you. >> reporting radiation levels are as confusing as they could possibly be. >> has just about 0.7 rem. you have to get up to 50 to 75 rem. >> we hear rem, microrem,