It was only in his late twenties that America’s favorite brainiac began to seriously embrace his love of trivia. Jeopardy!’s newest host also holds the show’s “Greatest of All Time” title. Steve digs into how Ken trained for the show, what it means to have a "geographic memory," and why we lie to our children.

This new Jeopardy! host is best known for playing neurobiologist Amy Farrah Fowler on The Big Bang Theory, but she has a rich life outside of her acting career too, as a teacher, mother — and a real-life neuroscientist. Steve learns more about this one-time academic and Hollywood non-conformist, who is both very similar to him and also quite his opposite.

The prisoner’s dilemma is a classic game-theory problem. Robert, a political scientist at the University of Michigan, has spent his career studying it — and the ways humans can cooperate, or betray each other, for their own benefit. He and Steve talk about the best way to play it and how it shows up in real world situations, from war zones to Steve’s own life.

Steve shows a different side of himself in very personal interviews with his two oldest daughters. Amanda talks about growing up with social anxiety and her decision to not go to college, while Lily speaks candidly about her battle with anorexia and the conversation she had with Steve that led her to finally seek treatment.

When we try to improve things, our first thought is often: What can we add to make this better? But Leidy, a professor of engineering, says we tend to overlook the fact that a better solution might be to take something away. He and Steve talk about examples from Leidy’s book Subtract: The Untapped Science of Less, and from their own lives.

An expert on urban economics and co-author of the new book Survival of the City, Ed says cities have faced far worse than Covid. Steve talks with the Harvard professor about why the slums of Mumbai function so well, high-quality housing in China sits empty, and declining cities hang on for so long.

Former U.S. Secretary of Education, 3x3 basketball champion, and leader of an anti-gun violence organization are all on Arne’s resume. He’s also Steve’s neighbor. The two talk about teachers caught cheating in Chicago public schools and Steve shares a story he’s never told Arne, about a defining moment in the educator’s life.

A special episode: Steve reports on a passion of his. Most high-school math classes are still preparing students for the Sputnik era. Steve wants to get rid of the “geometry sandwich” and instead have kids learn what they really need in the modern era: data fluency. Originally broadcast on Freakonomics Radio, this episode includes an update from Steve about a project he launched to revamp the education system.

He’s a Harvard physician and economist who just started a third job: host of the new podcast Freakonomics, M.D. He’s also Steve’s former student. The two discuss why medicine should embrace econ-style research, the ethics of human-challenge trials, and Bapu’s role in one of Steve’s, ahem, less-than-successful experiments.

He argues that personal finance is so simple all you need to know can fit on an index card. How will he deal with Steve’s suggestion that Harold’s nine rules for managing money are overly complicated? Harold and Steve also talk about gun violence — a topic Harold researches as a public-policy professor at the University of Chicago — and they propose some radical ideas for reducing it.