"Tell Me Something I Don't Know" is a live game show hosted by Stephen J. Dubner of "Freakonomics Radio." He has always had a mission: to tell you the things you thought you knew but didn't, and things you never thought you wanted to know, but do. Now, with "TMSIDK," he has a new way of doing just that. This new show is still journalism, still factual -- but disguised in the most entertaining, unexpected, and occasionally ridiculous conversation you're likely to hear. Audience contestants come on stage and try to wow a panel of experts with a fascinating fact, a historical wrinkle, a new line of research -- anything, really, as long as it's interesting, useful and true (or at least true-ish). The panel -- an ever-changing mix of comedians, brainiacs, and other high achievers -- poke and prod the contestants, and ultimately choose a winner. And there's a real-time, human fact-checker on hand to filter out the bull. This debut episode features Barnard College president Debora Spar, New York Public Library president Tony Marx, and comedian Andy Zaltzman; Jody Avirgan from FiveThirtyEight handles the fact-checking. You can subscribe now on iTunes. And don't worry, Freakonomics Radio isn't going anywhere -- this is just a special bonus episode of Dubner's new side gig.

The U.S. president is often called the "leader of free world." But if you ask an economist or a Constitutional scholar how much the occupant of the Oval Office matters, they won't say much. We look at what the data have to say about measuring leadership, and its impact on the economy and the country.