Geoffrey Canada, author of the book Fist Stick Knife Gun: A Personal History of Violence in America, talks about what it's like to carry a gun. He also talks about what poor neighborhoods in New York were like before the proliferation of handguns among young people. When he grew up in the South Bronx, kids had fistfights in a very formal arrangement with formal rules that everyone lived by. He reads from his book and talks with Ira.