C-Span’s “Booknotes” is a serious place to talk books. Host Brian Lamb has a big following, but the appeal of the show is in its simplicity. “This is not a show done for intellectuals. A lot of people thought it was in the beginning. They started to hear me ask some very basic questions, and they’d say: ‘Oh, my goodness, why is he asking those stupid questions?’ So: Why is he asking those questions? ‘I want to know the answer’.”