I watched an interview with Edward Witten some time ago and something he said surprised me. (http://www.youtube.com/watch?v=eEutI_JKr7A) 3:25 "Which in GR causes the acceleration of the universe to accelerate." Did he literally meant this? I'm not sure how accurately you can talk about the volume of the universe, but am I interpreting what he said right? Is true? I'm aware it is true for the second derivative but for the third too? V=Volume I hope this is in the right section. Thanks.