As Nepal makes 97 peaks free to climb, we look at the science of overtourism – especially on mountains. How do so many visitors affect these environments, and what can be done? Plus, are mountains carbon sources, or carbon sinks? And why do we feel the drive to summit these peaks anyway? A psychologist specialising in thrill-seeking explains. Also on the show, we take your questions, read out your comments, and look at what it takes to physically measure the height of a peak like Everest.All that, plus many more Unexpected Elements. Presenter: Caroline Steel, with Chhavi Sachdev and Leonie Joubert
Producers: Margaret Sessa Hawkins, with Alice Lipscombe-Southwell, Imaan Moin and Lucy Davies
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Why do we follow trends?
What's got rabbit-like ears, huge eyes, nine teeth and a demonic grin? It’s Labubu! These ugly-cute toys have gone viral online, largely thanks to social media’s trending machine. Their fame was previously limited to China and parts of Asia, but since 2024 their popularity has grown and the dolls can now be purchased in more than 30 countries round the world. This week, the global demand for Labubu inspired us to play around with trend-based science. First up, we hear how the special sauce behind TikTok’s algorithm helps drive viral trends. Next, we find out that humans are not the only ones that love a fad – chimpanzees are susceptible to them too!We then discover what connects the hugely popular Beanie Baby toys of the 1990s with modern CubeSat exploration, thanks to aerospace engineer Professor James Cutler, from the University of Michigan. Plus, we discuss a weird object thousands of light-years away that could lead to new physics.And why do we find songs annoying after multiple listens?All that, plus many more Unexpected Elements. Presenter: Marnie Chesterton, with Godfred Boafo and Edd Gent
Producers: Alice Lipscombe-Southwell, with Imaan Moin, Lucy Davies and Margaret Sessa Hawkins
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Floods, mangroves and rampaging tractors
This week, floods have hit the global headlines. First up, we delve into the various reasons why floods form. After learning about the causes of floods, we discover a nature-based solution in the form of mangrove forests. Laura Michie from the Mangrove Action Project tells us why these ecosystems are important, and how they can protect coastal zones.We also find out that humans have moved so much water around the planet that we’ve shifted the location of the geographic North Pole. Plus, a rare flooding event is currently taking place in the Australian Outback, awakening an ecosystem after years of dormancy. And what could happen when hackers take control of tractors?All that, plus many more Unexpected Elements. Presenter: Marnie Chesterton, with Andrada Fiscutean and Sandy Ong
Producers: Alice Lipscombe-Southwell, with Lucy Davies, Debbie Kilbride and Margaret Sessa Hawkins
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Traffic science
This week, a viral video of a robo-traffic-cop in Shanghai has the team contemplating the science of traffic. How do traffic jams with no discernible cause actually form? Does the weather experience traffic jams? And why do our cords also seem to get tangled in their own little cord-traffic-jams no matter how hard we try to keep them separate?Christine Yohannes from Addis Ababa, Ethiopia and Tristan Ahtone in Helsinki, Finland, join Marnie Chesterton to discuss all this, plus many more Unexpected Elements.Presenter: Marnie Chesterton, with Christine Yohannes and Tristan Ahtone
Producers: Margaret Sessa-Hawkins, with Alice Lipscombe-Southwell and Lucy Davies
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Trailer: 13 Minutes Presents: The Space Shuttle
The epic space story of a sci-fi dream that changed spaceflight forever. Told by the Nasa astronauts and team who made it happen. Our multi-award-winning podcast is back, hosted by space scientist Maggie Aderin-Pocock. She tells the story of triumph and tragedy - of a dream that revolutionised modern space travel forever.You can listen to the trailer here. To hear episodes, search for 13 Minutes Presents: The Space Shuttle, wherever you get your BBC podcasts.
13 Minutes Presents: The Space Shuttle is a BBC Audio Science Unit production for the BBC World Service.
Theme music by Hans Zimmer and Christian Lundberg, and produced by Russell Emanuel, for Bleeding Fingers Music.
Archive:
Mission audio and oral histories, Nasa History Office.
The news you know, the science you don’t. Unexpected Elements looks beyond everyday narratives to discover a goldmine of scientific stories and connections from around the globe. From Afronauts, to why we argue, to a deep dive on animal lifespans: see the world in a new way.
USA