(laughter) that is even what marcus welby did.t do that. >> right, and those are the best doctors. (laughter) >> the marcus welby era is over. because medicine is not black and white. there's a large gray zone. for example, look at mammograms. >> stephen: i-- i-- (laughter) i-- i was going to say-- i got caught once and i don't any more. but go ahead. >> the mammogram what age should they begin. how often should they be performed on a woman. four different expert groups come up with four different recommendations. high cholesterol, should you take a statin pill or not. what is your risk of a heart attack. do you want to take the risk of the side effects, muscle pain, indigestion, liver problems, so it's very individual. >> stephen: so if i'm a patient what should i do before i talk to a doctor. i mean obviously i'm checking web md and hi will want to get a second opinion from either wick pedestriania or twitte twitter-- wikipedia or twitter and then order some cheap canadian viagra through e-mail. what else can i do. >> so first i