dr. david somati, member of the medical a-team chief of robotics at mount sinai hospital, why is this happening> this is a fantastic news for all the cancer patients out there. the peak of cancer death was highest in 1991, about 20 years ago, we've seen a major decline, 20% as you mentioned is a huge number in this basically saving over a million people the last decade or so. so the reason why this is happening and mostly has to do with lung cancer, we see that the death rate has gone down. look at this, 215, over 100,000, and now 173 for 100,000, part of it's due to screening and debate the la last few years, for screening for breast cancer, prostate cancer, colon cancer really works or not and this is the answer today. and you can see you have to get screened and that information is very powerful and knowing it early on, you can obviously do something about it, lung cancer, prostate cancer, breast cancer, has been a major part of this and that's a major improvement in life quality. >> wonderful news. let me ask you in particular about cancer, are less people smoking and that's why lung cancer