so for instance, papillomavirus is a cancer that causes cervical cancer, a sexually transmitted virus so again there's a-- . >> stephen: i thought rick perry cured that. i'm pretty sure he cured that one. >> you could get vax-- certain people can get vaccinated against that form of cancer. >> stephen: how old is our knowledge of cancer? >> well, it's surprising. you think that-- one thinks cancer is a modern disease but it isn't. >> stephen: i do. >> but it isn't. in fact what is interesting, it is one of the very oldest medical man you cripps we have, 2,500 bc contains a case that resembles breast cancer, an egyptian manuscript so it is not only one of the old diseases, it's one of the oldest diseases that we ever knew about. >> stephen: do we know whether he with get it more, i think we think of it as a modern disease because it feels like more and more things give us cancer. that is sort of in my-- that is what it feels like to me and what it feels like is more important than whatever are you going to say, so-- do we have good records before the industrial revolution of people gett