and difference in painting a picture of sidney farber, to do that, too, came from different angles. and what's important is that humans beings are complex. even a character like farber, a lot of people didn't like him. he was an unpleasant character to some. and that's important to convey because otherwise you begin to write a history that is not real. thank you for your comments. >> have you ever been a doctor in a war? >> that's a good question. not in the sense that you might understand war. i have never been a doctor in the military forefront. but one might say that this is also a war, in the sense that when we sometimes, we fight wars between people, human beings fight each other, but sometimes we fight even more important wars against things that we can't see. and i might add that cancer is one such entity. i don't like using the word war sometimes because it feels as if patients become soldiers, and if you don't survive, you become a loser in such a war. so i don't like using that metaphor. but for some people it works. for some people really imagining as in a battle against