spf 50 because you get your 98%. >> you see 85 and 100? >> there is no use for it. over 50, you already have 98% protection. >> you have to reapply it, though. what we have available in the united states, it wears off. you go in the water, reapply it. and again, the take home message for parents out there, kids are the ones at risk for melanoma if you burn them. watch out for your kids. >> the pathophysiology of melanoma versus nonmelanoma based on this study seem to be different. you want to protect yourself and make sure you don't get to that blistering sunburn stage. >> wear sunscreen and reapply it. >> you said last week you said even i should wear it, people with darker complexions. very important. >> absolutely. >> two week ago we talked about how some doctors may not always have, not these two, may not always have the best bedside manners. next, what we're going to do. we're going to turn the tables as our doctors reveal their biggest pet peeves about their