. >> bj tavis -- tavis: we have the practice of medicine. there is a reason why they call it the practice of medicine. but there are increasingly debates about science. what about that? >> yes, many doctors have forgotten the scientific side of medicine, or they do not understand it. unfortunately, medical school, they do not teach you statistics or clinical trial methodology and things like that. we talked to a woman who got a broker -- bone marrow transplant for breast cancer. that treatment became very popular in the late 1980's. by 1998, 1999, there were more than 200 centers in the united states that actually offered bone marrow transplant for breast cancer. 1999 is when the four clinical trials were finally published to show that the bone marrow transplant for breast cancer not only did not work, it was not harmful over the old standard therapy, so we have 200 sites around the united states who are doing something, and the science is finally completed 12 to 15 years after they started doing it. there are so many things we do in medicin