Episode 31School Start Times, Brand Names, and Too Much Ground Beef

Starting all U.S. middle and high schools at 8:30 a.m. would add roughly $9 billion per year to GDP. (Photo: David Joyce/flickr)

Alex Wagner (CBS This Morning SaturdayThe Atlantic) is our special guest co-host, with AJ Jacobs (author of It’s All Relative) as real-time fact-checker. We filled this episode with insights about the true value of ground beef, sleeping in, company names, and more.

Episode 30How to Count to Infinity

Mary Roach joins TMSIDK for a "grab bag" episode with a lot of science. (Photo: Lucy Sutton)

Mary Roach (author of StiffSpookBonkGulp, and Grunt) is our special guest co-host, with AJ Jacobs (author of It’s All Relative) as real-time fact-checker. If the promise of tractor beams doesn’t pull you in, our guests also explore robotic fish, counting to infinity, and more.

Episode 29The Perfect Potato Chip, the Origin of Seltzer, and Why We Eat “Beef” and Not “Cow”

Alex Guarnaschelli (Iron Chef America and Chopped) is our special guest co-host, with Sean Rameswaram (Radiolab Presents: More Perfect) as real-time fact-checker. (Photo: Lucy Sutton)

Alex Guarnaschelli (Iron Chef America and Chopped) is our special guest co-host, with Sean Rameswaram (Radiolab Presents: More Perfect) as real-time fact-checker. TMSIDK explores the origins of food words, children’s menus, and seltzer.

Episode 28You Say “eye-RACK,” I Say “ear-ROCK”

Special-guest co-host Hari Kodabolu's high school named their mascot for him. (Photo: Lucy Sutton)

Hari Kondabolu (comedian and host of Politically ReActive) is our special guest co-host, with Sean Rameswaram (Radiolab Presents: More Perfect) as real-time fact-checker. TMSIDK reaches into our “grab bag” for fascinating facts on the downside of keeping secrets, the origin of fantasy sports, what pronunciations say about our politics, and more.

Episode 27Womb to Tomb

Ruth Finkelstein explains how to make cities more friendly for seniors. (Photo: Lucy Sutton)

Alexandra Petri (Washington Post columnist) is our special guest co-host, with AJ Jacobs (author of It’s All Relative) as real-time fact-checker. TMSIDK covers everything from birth to earth, including pregnancy tests, parenting, monogamy, aging better, and, finally, embalming.

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Episode 0Season 4 Sneak Peek

Host Stephen J. Dubner questions a presenter during Season 4 of Tell Me Something I Don't Know (Photo: Lucy Sutton)

Season 4 of Tell Me Something I Don’t Know is almost here! Get ready for 10 brand new episodes starting September 17. We’ve packed every episode with things you probably didn’t know, and we’ve got some great co-hosts, including — but not limited to — Alex Guarnaschelli, Alex Wagner, John McWhorter, Angela Duckworth, Hari Kondabolu, Jemele Hill, and Alexandra Petri.

If you don’t already subscribe to TMSIDK, you should, right now. Especially because it’s free. If you can’t wait until September 17, you can get the first episode of the new season right now, ad-free, by signing up for Stitcher Premium. Also, follow TMSIDK on TwitterFacebook, and Instagram.

And if you want to be part of Tell Me Something I Don’t Know, sign up to be a contestant or come to one of our live tapings in New York City this fall. We’ll be at Joe’s Pub at the Public Theater, in downtown Manhattan, on October 5, 6, and 7, so join us! Because you never know what you’ll learn.

Episode 0Extra 6: A Better Way to End Basketball Games

Would basketball be the same without buzzer-beaters like Michael Jordan's "The Shot?" (Photo: Wikimedia Commons)

Basketball fans know how boring a game’s ending can be — intentional fouls can stretch 90 seconds into 10 minutes. What if we could fix it by blowing up the last 4 minutes?

Stephen Dubner and A.J. Jacobs are joined by Nick Elam.

Episode 0Extra 5: The Actress Who Never Takes a Sick Day

Catherine Russell also manages the theater in which she performs. (Photo: "Perfect Crime")

Off-Broadway actress, producer, and Guinness Record-holder Catherine Russell has played the same off-Broadway role for three decades. What’s more impressive than the play itself? She’s never called in sick.

Stephen Dubner and A.J. Jacobs are joined by Russell.

Episode 0Extra 4: The Most Renewable Energy of All

Researchers tested pee power in music festival urinals around England. (Photo: The University of the West of England)

Some of our most important inventions safely remove human waste. But what if we could use that waste to generate electricity?

Stephen Dubner and A.J. Jacobs are joined by Jonathan Winfield.

Episode 0Extra 3: The Rise and Fall (and Rise?) of Rosé Wine

Despite its popularity from the Middle Ages to the French Revolution, rosé wine is only-recently making a comeback for modern palates. (Photo: By Menérbes/Flickr)

From medieval times through the French Revolution, rosé ruled the wine world — and now it’s staging a comeback.

Stephen Dubner and A.J. Jacobs are joined by actress (and rosé fan) Miriam Shor and wine writer Katherine Cole.