Interested in the world's population and got 43 minutes to spare? Joel Cohen of the Rockefeller and Columbia has an excellent discussion. You may be surprised w

Interested in the world's population and got 43 minutes to spare? Joel Cohen of the Rockefeller and Columbia has an excellent discussion. You may be surprised what you learn. http://www.floatinguniversity.com/lectures-cohen http://www.floatinguniversity.com/lectures-cohen Also on YouTube: http://www.youtube.com/watch?v=2vr44C_G0-o http://www.youtube.com/watch?v=2vr44C_G0-o