Travel identification has taken many forms over the years, from stone tablets to an exhausting process that involved posting your itinerary on a church door. But how did we arrive at the standardized booklets many of us carry today? How do different countries use art and technology to distinguish their passports? And what’s the best (and worst) passport in the world, according to experts? Plus: Why you can blame a German spy for your embarrassing passport photo.

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Photo by Spencer Davis via Unsplash. Thanks, Spencer!

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Why does Germany use five different bins for recycling? Can you trick people into being greener by putting wolves on packaging? And is recycling a good business to be in? Plus, why Totes McGoats is one of the worst phrases of all time... but also perhaps the best recycling mascot ever. Featuring Christopher Hassiotis from HowStuffWorks.

This episode originally aired on January 24, 2018.

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Photo by Pawel Czerwinski via Unsplash. Thanks, Pawel!

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Why did people start (and stop) dyeing pistachios red? How do thieves pull off high-stakes nut heists? What’s up with the coconut that looks like a butt? And why do so many members of the PTG team have beef with pine nuts? Today, we’re cracking the delicious mysteries of nuts (and, yes, things that aren’t technically nuts).

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Photo by Mae Mu via Unsplash. Thanks, Mae!

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Is our obsession with cleanliness keeping us from peak health? Also, can hookworm cure allergies? Will harvesting panda poop make you rich? Plus: Why Amish dust is superior to other dust (seriously!). Featuring Penny Sarchet.

This episode originally aired on June 14, 2017.

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Why is it so hard to stop oversleeping and eating candy? Why is it equally hard to start going to the gym and preparing healthy snacks? If you’ve been struggling with New Year’s resolutions, you’re not alone—turns out humans have wrestled with habits for centuries, like the guy who paid his servant to drag him out of bed in the morning. Will and Mango have the answers you need, with a little help from behavior change expert Dr. Katy Milkman. 

• Buy Katy Milkman’s book, How to Change, and subscribe to her newsletter, Milkman Delivers!

Remember, Monday, March 2 is the official 2026 Part-Time Genius Habit Change Fresh Start Day! Mark your calendars and let us know what habit you’re trying to change. Call our hotline at (302) 405-5925 or email [email protected].

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We have ZERO intention of eating less food! But if you had to pare down your pantry to the bare minimum, what are the only foods you'd need to survive? Is an all-potato diet healthy? And did Steve Jobs' strange diet affect his business decisions? Plus, Will and Mango discuss the Woodstock for fruit lovers and find out why the elderberry might be the most overlooked berry. Featuring Spudfit.com's Andrew Taylor.

This episode originally aired on November 1, 2017.

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Photo by Lars Blankers via Unsplash. Thanks, Lars!

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We honk at them in the street and shoo them away from our trash cans, but opossums are so much more than nocturnal nuisances. In today’s episode, Mango and Gabe get better acquainted with America’s only native marsupials, including the truth behind their famous talent for playing dead and their surprising connections to President Taft and Captain John Smith. Plus: A stirring ode to the opossum on Mango’s balcony and a tongue-in-cheek recipe for “planked possum.”

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Will and Mango are on a mission to uncover chocolate's darkest secrets. What's the difference between cacao and cocoa? Why have Swiss scientists been working on a pink chocolate for so long, and what does it really taste like? Plus, why does chocolate melt so perfectly in our mouths?

This episode originally aired on February 21, 2018.

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Let’s be real: eating at Olive Garden isn’t the same as dining in Tuscany. But does that mean the food is inherently worse? Today Will and Mango explore the concept of culinary authenticity, including how it’s measured, who it benefits, and what it really means for one dish to be “more authentic” than another. Plus: The political calculus of wolfing down corn dogs, and the shocking origin of Outback Steakhouse (spoiler alert: it does not involve Australia!).

• Did you know that instant mashed potatoes are authentic Canadian cuisine? Check out this episode on Great Inventions from the Great White North to learn more!

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Who's the Michael Phelps of the early winter games? Why did the 1924 British curling team just get their gold medals? And what are the greatest sports we wish were still in the Olympics (who's up for a round of Korfball)? Will and Mango dive into Olympic history and investigate how one little rule change affected how future sports were played. Featuring American ski archer Dave Bergart.

This episode originally aired on January 17, 2018.

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Reading a book, going to the movies, listening to your favorite band… you call them hobbies, but acclaimed scientist Daisy Fancourt calls them public health strategies. She joins producer Mary to discuss her new book, Art Cure: The Science of How the Arts Save Lives, and shares insights from her research—like the fact that engaging with the arts reduces the risk of depression, and listening to music before surgery results in faster healing. Daisy also explains why she’s hopeful in the face of widespread cuts to arts funding, and why you don’t have to be good at the arts to benefit from them. 

• Buy Art Cure: The Science of How the Arts Save Lives

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