called e-mail or tweed ben mezrich live on in depth sunday on c-span2. spent now on booktv, lisa randall looks at the contributions that physics and scientific thinking have made to our understanding of the universe. this is a little over an hour. >> good evening. we will get started. if you're just coming in there are seats appear to my left. our you can stand off to the corners or find an open seat towards the back. welcome to politics and prose. thank you all for being here. i want to start just by welcoming you and saying thanks for being here on half of our new owners. and the staff here, just a collective thanks for supporting the bookstore and supporting events here tonight, being here for lisa randall and her second book, "knocking on heaven's door." so we are excited to have her here and talk about this book. so before we begin, if you're new here, i'll commit out quickly go over the format. what's going to happen, lisa is going to present your book. she will talk about her book using some visuals as well. what we are going to do is leave the li