give doctors a clear idea of what's going on inside our bodies. As patients, we should follow their lead. We ought to have a clear picture, too, of what a scan can and can't do -- before we undergo it ...

Radiation is everywhere—in the air we breathe, the water we drink, the walls of our homes and offices, emanating from microwaves, at the dentist, and at the doctor if we break a bone. And we’re told, ...