What's better than holiday hot chocolate? If just thinking about it makes you feel all warm and fuzzy, well – that’s by design. Chocolate's big history sweeps across the globe, and today we’re going on that journey: from the pre–Columbus Americas, to an early 20th century reporter’s hunch about what cocoa production really takes, to a 21st century medical student’s story about his childhood on a farm that produces those holiday treats.

Guests:

Carla Martin, lecturer in African and African American Studies at Harvard University and President of the Board of the Institute for Cacao and Chocolate Research

Catherine Higgs, professor of history at the University of British Columbia in Canada

Shadrack Frimpong, founder of Cocoa360

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On today's show, a Thanksgiving story you might never have heard -- not about Pilgrims or Native people, but instead about a woman who, as civil war loomed, pushed for a shared national holiday she thought would keep the United States together. This episode originally ran in 2024.

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Rund Abdelfatah and Cristina Kim try to unravel the mystery of a Soviet scientist who was helping to spread the word about nuclear winter theory—until he disappeared. 

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How quickly can a government fall? Chile was once one of Latin America's oldest democracies, but that all changed in a matter of hours after a military coup on September 11, 1973. Some supported the coup; many did not. But for the next 17 years, all Chileans lived in the grip of brutal authoritarian rule. Today on the show, the story of a democracy’s collapse and rebirth, told through the eyes of four people who lived through it.

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On the surface, the story of Sudan’s war is about two generals vying for power. But it’s also about a vast web of international interests involving the U.S., China, Russia, and the UAE.  Today on the show, the story of how things in Sudan got to this point, and the effects of the conflict around the world. This episode originally ran in 2024 and has been updated.

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Late last month, President Trump announced that the United States would be restarting nuclear weapons tests after a break of over 30 years. We’ve since learned that they won’t be the explosive kind of tests, but this sent us down a rabbit hole — where we found a story about dinosaurs, Carl Sagan, and nuclear war. Because there was a moment in the not-so-distant past when we learned what drove the dinosaurs extinct... and that discovery, made during the Cold War, may have helped save humans from the same fate. This episode originally published in March 2025.

Guests:

David Sepkoski, Thomas M. Siebel Chair in History of Science at the University of Illinois and author of Catastrophic Thinking: Extinction and the Value of Diversity. 

Owen Brian Toon, professor of atmospheric and oceanic sciences at the University of Colorado Boulder.

Alec Nevala-Lee, novelist, critic, and biographer and author of the forthcoming book Collisions: A Physicist's Journey from Hiroshima to the Death of the Dinosaurs. 

Ann Druyan, co-writer and co-creator of the television series Cosmos: A Personal Voyage. 

Andrew Revkin, science and environmental journalist.

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Stuck in traffic? Glued to your desk chair? Folding yet another pile of your kids’ laundry? We GOT you!! Take a break, turn up the volume, and shake it out with this special episode of Throughline, a tribute to dance music, all songs composed by our very own Ramtin Arablouei.

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What powers the global internet? The answer might surprise you: not satellites, but hundreds of thin cables that run along the ocean floor. They’re an absolutely essential technology that’s also incredibly fragile — so fragile that in the beginning, most people thought they couldn't possibly work. Today on the show: the story of a man who did think they could work… and the lengths he went to to try and connect the world.

Guests:

Bill Burns, former BBC broadcast engineer and founder of atlantic-cable.com 

Cyrus Field IV, great-great-grandson of Cyrus Field

Allison Marsh, professor at the University of South Carolina and historian of technology 

Ben Roberts, strategic advisor on Subsea Cable Economics for Connectivity at UNICEF who has been building cable network in Africa for the past two decades

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Israel and Hamas have agreed to a plan to end fighting in Gaza, just over two years after the Hamas-led attack on Israel on October 7th, 2023 and Israel’s subsequent bombardment and invasion of Gaza. As we wait to see what happens next, we’re revisiting our episodes looking at the history of major players on both sides of the conflict. Last week, we looked at the history of Hamas; if you missed that, go back and check it out. This week, we’re bringing you the story of the rise of right wing politics in Israel and President Benjamin Netanyahu’s political career. This episode first ran in 2024.

Guests: 

Amjad Iraqi, senior analyst for Israel/Palestine at the International Crisis Group and former senior editor at +972 Magazine.  

Natasha Roth-Rowland, historian and director of research and analysis at Diaspora Alliance, an international organization that combats antisemitism.  

Sara Yael Hirschhorn, historian,visiting professor at the University of Haifa and fellow at the Jewish People Policy Institute.

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With peace talks once again underway between Israel and Hamas, and hopes again growing for a permanent ceasefire, we’re bringing you our episode on the origins of Hamas: where it came from, how its influence grew, and what it represents. Next week, our episode on Benjamin Netanyahu and the rise of Israel’s right wing. This episode first ran in November 2023.

We've done episodes on Hamas, Israel, Lebanon, Iran, and more. Find them all in our series, "The Cycle".

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