Discussion at the Moving Naturalism Forward workshop, October 2012. Participants include Sean Carroll, Jerry Coyne, Richard Dawkins, Terrence Deacon, Simon DeDeo, Daniel Dennett, Owen Flangan, Rebecca Goldstein, Janna Levin, David Poeppel, Massimo Pigliucci, Nicholas Pritzker, Alex Rosenberg, Don Ross, and Steven Weinberg. http://preposterousuniverse.com/naturalism2012/ This is the 4th of 10 sessions, featuring more discussion of reduction and emergence, started off by Simon DeDeo. See the website for more information and links to the other videos.