also, confronting the unthinkable. a teenage boy gets cancer, and his father discovers this remarkable source of help. first, under the microscope. a new treatment for depression. a fascinating story. a disease, as you know, that affects more people than coronary heart disease or cancer. good news is that in most cases, it is treatable. medication such as anti-depressants can be effective. in milder cases, cognitive behavioral therapy has been shown to work just as well. unfortunately, for many people, nothing seems to help. and that s why it s exciting to hear about a totally new approach that involves a device that looks like a pacemaker. two wires inserted directly under the brain, and then on the outside, a doctor can literally flip a switch. a pretty radical approach. in some cases, the results are astonishing. for as long as edie geiten can are. she could not get the sad thoughts out of her head. my mother used to say to me, smile, why don t you smile? and i would