The Freakonomics empire was born of reluctance - a journalist on assignment, an economist resistant to being profiled. But Steven D. Levitt (the journalist) and Stephen J. Dubner (the economist) hit it off, cowrote two bestsellers, started a blog, made a documentary, and founded a radio show. Readers will find much to titillate their imaginations in these weekly radio broadcasts. Recent hour-long episodes have focused on the ideas of behavioral economist Katherine Milkman, a breakdown of ideas that "must die," and the suggestion to think like a child. Readers may also like to sign up for the Freakonomics email newsletter or explore other sections on the Freakonomics site, including the blog, videos, and lectures.