Four books. A blog. A documentary film. A pair of pants. And a radio show.

It began when New York journalist and author Stephen J. Dubner went to Chicago to write about award-winning economist Steven D. Levitt for The New York Times Magazine. Dubner had been reluctant to take the assignment (he was in the middle of writing a book about the psychology of money). Levitt was reluctant to be shadowed by a journalist (but his mother loved the Times Magazine, so he gave in). The article came out, and led to an unexpected partnership. Levitt and Dubner wrote Freakonomics, a book about cheating teachers, bizarre baby names, self-dealing Realtors, and crack-selling mama’s boys. They figured it would sell about 80 copies. Instead, it took up long-term residency on the Times best-seller list, and went on to sell more than 4 million copies in 35 languages. Then they wrote SuperFreakonomics. It also became a worldwide best-seller. A lot of other stuff happened, too. A blog. A documentary film. Jon Stewart and Beauty and the Geek! Lectures. A pair of pants. A radio show. Not bad for a partnership born of such profound reluctance.