[inaudible conversations] >> for more information visit the author's web site jeffrey sachs.org. >> when did we reach a point that you had to have a certain philosophy because of the color of your skin? when did that happen? [cheers and applause] >> a reporter once asked me why i didn't talk a lot about race and i said because i am not neurosurgeon. they thought that was pretty strange. when i cut the scalp and open the door up i was operating on the thing that makes the person who they are. when will we understand that? >> surgeon and author ben carson takes your calls, e-mails, facebook comments and tweets, in depth, three hours live on booktv on c-span2. >> has written the first book, knocking on have been's door, the path to a better way of death. katie butler, who was jeffrey butler? >> every but there was my father and you are holding a picture of him and me in a loving position. he was of world war ii veteran who lost his arm in the war and an amazing that's. he built cases for our living room with only one arm which was amazing and he was a professor of history. >> where did he t