Get your think on this week with readings about sex, war, and politics. A couple of big names come to town to discuss these big concepts. Cokie Roberts will talk about ladies of liberty on Wednesday and Howard Zinn presents a graphic adaptation of People's History at the Brattle on Thursday. The Zinn event is sold out, sadly, but maybe you can flash your red star tattoos to gain admittance? Mary Roach, Bonk: The Curious......