africa, the harvest of wildlife for bush meat what led to spillover of some of these diseases. that is probably what carried ebola from a chimpanzee into a village of people. in one case that is very well-documented. and of course, the aides pandemic began, we now know began with a spillover of a virus from a single chimpanzee to a single human of south eastern corner of cameroon, back as early as 1908 give or take a margin of error. jon: look where we are now. wow! it is a really sobering book. interesting reading. david qaman is the author. spillover is the book. thanks for sharing that frightening perspective with us. pleasure to be with you, jon. jenna: president obama and governor romney making final preparations for tomorrow night s debate, cramming if you will, the next 24 hours. what can we expect in round two? we ll have a preview next.