Science Talk is a weekly science audio show covering the latest in the world of science and technology. Join Steve Mirsky each week as he explores cutting-edge breakthroughs and controversial issues with leading scientists and journalists. He is also an articles editor and columnist at Scientific American magazine. His column, "Antigravity," is one of science writing's great humor venues. Also check our daily podcast from Scientific American : "60-Second Science." To view all of our archived podcasts please go to www.scientificamerican.com/podcast