the fda now considering whether that little blue pill can help children with a rare lung disorder. here to explain that, dr. lee vanacor of the university of maryland, and an emergency room doctor as well. doctor, you say that actually, this is being used already? can you explain that? >> it's not that it's being used. they're testing it on kids. but it's not far fetched, because really, viagra is a drug that die laves the smooth muscle, the blood vessels, that have smooth muscle around them, and that's why it worked, and it was actually developed for high blood pressure and heart pain, angina, and when they did this study years ago they found it wasn't helping the angna -- the a angina because everybody had better erections, then pfizer tested it and found it helped erectile dysfunction through this dioxide. so now we know it helps