Science Weekly

Science editor Ian Sample sits down with co-host Madeleine Finlay and science correspondent Hannah Devlin to hear about three eye-catching stories from the week, including a study showing that the brain has five ‘eras’, with adult mode not starting until our early 30s. Also on the agenda is new research showing the shingles vaccine not only protects against dementia but could actually slow its progress, and a paper exploring how ants sacrifice themselves when they become infected with pathogens to protect their healthy relatives. Help support our independent journalism at theguardian.com/sciencepod

04/12/2025 • 18:11

Artificial intelligence can execute tasks in seconds that once took humans hours, if not days to complete. While this may be great for productivity, some researchers are concerned that our increasing use of AI could be impacting our ability to tackle difficult problems and think critically. To find out where the science stands, and how worried we should be about the potential of AI to change how we think, Ian Sample hears from Madeleine Finlay and Sam Gilbert, professor of neuroscience at University College London. Help support our independent journalism at theguardian.com/sciencepod

02/12/2025 • 20:35

Patrick Vallance, the minister for science, research and innovation, recently unveiled a plan to cut animal testing through greater use of AI and other technologies, with the eventual aim of phasing it out altogether. To understand how this will affect research and what could be used in place of animal models, Madeleine Finlay hears from science editor Ian Sample, Prof Hazel Screen of Queen Mary University London and Prof Kevin Harrington from the Institute of Cancer Research. Help support our independent journalism at theguardian.com/sciencepod

27/11/2025 • 17:31

After bitter arguments, threatened walkouts and heated all-night negotiations, delegates eventually reached a deal this weekend at the Cop30 climate summit in Brazil. To unpick what was achieved and what was left out, Madeleine Finlay hears from the Guardian’s environment editor, Fiona Harvey, who has been following every twist and turn. Help support our independent journalism at theguardian.com/sciencepod

24/11/2025 • 15:52

As the Cop30 climate talks continue in Brazil, Madeleine Finlay hears about a landscape at the opposite end of the planet facing the direct impacts of the climate crisis. The Guardian reporter Leyland Cecco recounts a recent trip to Qikiqtaruk (also known as Herschel Island) off the coast of Canada’s Yukon territory, where he saw first hand how indigenous groups and scientists are reckoning with an ecosystem collapsing into the sea. He tells Madeleine about efforts to preserve the history of the island and how scientists are racing to understand what it means for the fate of other arctic communities.. Help support our independent journalism at theguardian.com/sciencepod

20/11/2025 • 16:02

This year’s flu season has begun more than a month earlier than usual, with a mutated strain spreading widely among younger people and expected to drive a wave of hospital admissions as it reaches the elderly. Science editor Ian Sample speaks to Madeleine Finlay about what we know so far and Prof Ed Hutchinson of the University of Glasgow explains how people can best protect themselves and each other. Help support our independent journalism at theguardian.com/sciencepod

18/11/2025 • 16:14

Ian Sample joins Madeleine Finlay to discuss some of the most intriguing science stories from the week. They discuss the complicated legacy of James Watson, who won the Nobel Prize for the discovery of the structure of DNA; a new breakthrough in the quest to understand the autoimmune disease lupus; and why everyone from Joe Rogan to Kim Kardashian is talking about comet 3I/Atlas.. Help support our independent journalism at theguardian.com/sciencepod

13/11/2025 • 20:43

Do you have an uncanny recall for faces? Have you ever recognised the same extra in TV shows that are decades apart? If so you could be part of the small number of super recognisers. Research from the University of New South Wales indicates they naturally pick out the most useful parts of a given face to help commit it to memory. So what else have scientists uncovered about this elite cohort? Dr David Robertson, a senior lecturer in psychology at the University of Strathclyde, talks to Ian Sample about what life is like for super recognisers, and how their powers could be put to use for the public good. Help support our independent journalism at theguardian.com/sciencepod

11/11/2025 • 15:45

Global environment editor Jon Watts goes in search of answers to the question the journalist Dom Phillips was investigating when he was murdered: how to save the Amazon? In the final episode of this three-part series from June 2025, Jon encounters a radical new view of the Amazon’s history being uncovered by archaeologists. Far from an uninhabited wilderness, the rainforest has been shaped by indigenous peoples for thousands of years. Jon finds out how their expert knowledge could be harnessed to secure the Amazon’s future. Help support our independent journalism at theguardian.com/sciencepod

07/11/2025 • 25:00

Jon Watts, the Guardian’s global environment editor, goes in search of answers to the question the journalist Dom Phillips was investigating when he was murdered: how to save the Amazon? In episode two of this miniseries from June 2025, Jon meets the people trying to make sure the rainforest is worth more standing than cut down – from a government minister attempting to establish Brazil’s ‘bioeconomy’ to a startup founder creating superfood supplements and a scientist organising night-time tours hunting for bioluminescent fungi. Jon explores new ways of finding value in the forest and asks whether they will be enough to secure its survival. Help support our independent journalism at theguardian.com/sciencepod

06/11/2025 • 24:28

Global environment editor Jon Watts goes in search of answers to the question the journalist Dom Phillips was investigating when he was murdered: how to save the Amazon? In episode one of this miniseries from June 2025, Jon explores what’s at stake if we fail to act in time. He hears about the crucial role of the rainforest for South America and the global climate, and asks how cattle ranching came to dominate and destroy huge swathes of the rainforest – pushing it to a dangerous tipping point today. Help support our independent journalism at theguardian.com/sciencepod

05/11/2025 • 27:57

As global leaders and environmental activists descend on Brazil for next week’s Cop30 climate summit, Madeleine Finlay speaks to the Guardian’s global environment editor, Jon Watts, who recently sat down for an exclusive interview with the UN secretary general, António Guterres. As he approaches his penultimate summit as the UN chief, Guterres reflected on humanity’s progress in attempting to limit global warming to 1.5C above pre-industrial levels, why Indigenous voices must be listened to and how he remains positive in the face of the climate crisis. Help support our independent journalism at theguardian.com/sciencepod

04/11/2025 • 15:54

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode three, all of Tam’s lies come to a head and Stuart uncovers exactly where Tam was sourcing tea to supply to hotels and shops. At trial, Tam takes the stand and Richard and the Scottish growers finally get some answers. But what remains today of the nascent Scottish tea industry that Tam instigated?. Help support our independent journalism at theguardian.com/sciencepod

30/10/2025 • 20:56

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode two, Nicola hears how Tam’s network of Scottish tea growers began to have suspicions about exactly what he was selling and where it came from, and how cutting edge science helped provide some answers. Help support our independent journalism at theguardian.com/sciencepod

29/10/2025 • 23:00

Science correspondent Nicola Davis investigates the strange story of Tam O’Braan and his attempts to grow tea in Scotland. In episode one, Nicola looks back on her first meeting with Tam while working on a feature about tea plantations in the UK. He was selling his award-winning Scottish-grown tea to some of the UK’s finest hotels, but something didn’t quite add up. And Nicola wasn’t the only person taking an interest in his story. Help support our independent journalism at theguardian.com/sciencepod

28/10/2025 • 22:02

An electronic eye implant half the thickness of a human hair has helped people with incurable sight loss to see again, opening up a potential ‘new era’ in tackling blindness. Madeleine Finlay hears from Mahi Muqit, a surgeon from Moorfields eye hospital in London, about what this implant has meant for his patients and what the future could hold for vision-loss therapies. Help support our independent journalism at theguardian.com/sciencepod

23/10/2025 • 15:19

As biodiversity declines, locating and conserving the planet’s plant life is becoming more important. The Millennium seed bank in Wakehurst, West Sussex, has been doing just that for 25 years, collecting and storing seeds and keeping them in trust for countries all over the world should they ever be needed. To mark the anniversary, Patrick Greenfield took a tour of the site. He tells Madeleine Finlay about the journey a seed takes from arrival to cold storage, and how some are already helping to return endangered plant species to the wild. Help support our independent journalism at theguardian.com/sciencepod

21/10/2025 • 16:58

Celebrities including Bella Hadid, Justin Bieber and Miranda Hart have talked about their years-long struggles with the effects of Lyme disease, but despite rising rates and better awareness, the illness remains poorly understood. To understand more about how the illness can impact people over the long term, Madeleine Finlay hears from the Guardian’s Patrick Barkham about his daughter Milly’s experience, and from Prof John Aucott, director of the Johns Hopkins Lyme Disease Research Center, and associate professor of medicine at Johns Hopkins University. Help support our independent journalism at theguardian.com/sciencepod

16/10/2025 • 19:57

The Traitors has returned to UK screens with its biggest viewing figures ever as 19 celebrities compete to be crowned the winner. The game depends on being able to accurately spot a liar, but are any deception detection methods actually backed up by science? Madeleine Finlay speaks to Timothy Luke, a senior lecturer in the department of applied psychology at the University of Gothenburg, to find out whether sweating, nervous ticks and reduced eye contact really can alert us to deception, and if not, what can?. Help support our independent journalism at theguardian.com/sciencepod

14/10/2025 • 15:51

This year’s Nobel prizes in chemistry, physics and physiology or medicine have celebrated work that paves the way for the next generation of quantum technology, the creation of porous materials that have been compared to Hermione Granger’s handbag and the discovery of the hidden army inside us that helps to keep our immune system in check. To find out more, Madeleine Finlay talks to our science editor, Ian Sample, and correspondents Nicola Davis and Hannah Devlin. Help support our independent journalism at theguardian.com/sciencepod

08/10/2025 • 20:55

Kevin Hall spent 21 years at the US National Institutes of Health and became known globally for his pioneering work on ultra-processed foods. In April he unexpectedly took early retirement, citing censorship under the Trump administration. Now he has co-authored a book with the journalist Julia Belluz that aims to bust myths and challenge wellness orthodoxy on everything from weight loss and metabolism to supplements and wearables. Hall tells Ian Sample what he wants us all to understand about diet, exercise and weight loss, and what led to his departure from the job he loved. Help support our independent journalism at theguardian.com/sciencepod

07/10/2025 • 21:17

The renowned primatologist Jane Goodall has died aged 91. She will be remembered for her observations that revolutionised our understanding of chimpanzees, as well as her tireless environmental advocacy. Ian Sample talks to the Guardian’s global environment editor Jon Watts, who met Goodall several times, to find out what her scientific legacy will be. Help support our independent journalism at theguardian.com/sciencepod

02/10/2025 • 17:05

Scientists are warning that academic publishing needs urgent reform in order to retain trust in the research system. Ian Sample tells Madeleine Finlay what has gone so wrong, and Dr Mark Hanson of the University of Exeter proposes some potential solutions. Help support our independent journalism at theguardian.com/sciencepod

02/10/2025 • 18:28

The Ig Nobel prizes were awarded recently – for science that makes you laugh and then think – and the peace prize was given to a cheeky study testing the link between alcohol and language proficiency. Does a drink really help us to converse more convincingly in another tongue, or does it just give us inflated confidence? To find out, Madeleine Finlay speaks to a member of the winning team, Dr Fritz Renner, a researcher in clinical psychology and psychotherapy at the University of Freiburg in Germany. Help support our independent journalism at theguardian.com/sciencepod

30/09/2025 • 13:07

In a televised press conference on Monday, Donald Trump and health secretary Robert F Kennedy Jr made a series of unproven claims about autism and its links to paracetamol use in pregnant women, and about childhood vaccinations. The comments were immediately refuted by scientists and health agencies around the world, but many expressed concern about the impact of this misinformation being repeated at the highest levels of government. So what does the science really say? Madeleine Finlay speaks to Guardian science editor Ian Sample to factcheck the claims made in the announcement, and find out what decades of scientific research into autism tells us about its causes and why diagnoses are on the rise. Help support our independent journalism at theguardian.com/sciencepod

24/09/2025 • 20:18

A trial is under way to find out if a £100 blood test could transform the way that the NHS diagnoses Alzheimer’s disease. Alzheimer’s is the leading cause of dementia and diagnosis is currently costly and time-consuming. To find out how this blood test could benefit patients, Ian Sample talks to Prof Jonathan Schott, who is co-leading the trial. He explains what the test involves and why it could pave the way for exciting new treatments for the devastating disease. Help support our independent journalism at theguardian.com/sciencepod

23/09/2025 • 14:52

The murder of political activist Charlie Kirk has prompted fears about rising levels of political violence in the US after a number of high-profile assassinations and attempted assassinations of political figures in recent years. But how connected are these events and do they signal a rise in public support for this kind of violence? To find out Ian Sample speaks to Sean Westwood, an associate professor in political science at Dartmouth College and director of the Polarization Research Lab. He explains how political violence has evolved and why overestimating the support for such acts can be dangerous. Help support our independent journalism at theguardian.com/sciencepod

18/09/2025 • 18:20

At a recent ceremony for world leaders in Beijing, a hot mic picked up a surprising exchange between Vladimir Putin and Xi Jinping about the possibility of living to 150. Putin suggested the secret might lie in repeated organ transplants. But is this the new frontier of anti-ageing research or a fringe and unproven theory? To find out, science editor Ian Sample speaks to Russian affairs reporter Pjotr Sauer and to John S Tregoning, professor of vaccine immunology at Imperial College London and author of Live Forever: A Curious Scientist’s Guide to Wellness, Ageing and Death. Help support our independent journalism at theguardian.com/sciencepod

16/09/2025 • 18:43

The fertility rate in England and Wales has fallen for the third year in a row – a trend mirrored across the world, with two-thirds of the global population now living in countries with below-replacement-level fertility. In the second episode of a two-part series, Madeleine Finlay speaks to Dean Spears, assistant professor of economics at the University of Texas at Austin, and Dr Jennifer Sciubba, chief executive of the Population Reference Bureau, to ask whether declining birth rates are really something to worry about – and how societies can adapt to a future with fewer children. Watch the new Guardian documentary Between Moon Tides. Help support our independent journalism at theguardian.com/sciencepod

11/09/2025 • 16:44

The fertility rate in England and Wales has fallen for the third year in a row. It is a story that is being repeated all over the world, with two thirds of the global population now living in countries with below replacement level fertility. Low fertility rates have become a talking point on the political right, with Elon Musk claiming that population decline is an existential threat to the future of humanity. But for others, the timescales involved are too vast to start worrying about now. So how should we be thinking about population decline? In episode one of a two-part series, Madeleine Finlay speaks to Dean Spears, assistant professor of economics at the University of Texas at Austin, and to Dr Jennifer Sciubba, president and CEO of the Population Reference Bureau, to find out what has happened to global birth rates, and how governments are trying to tackle the fall. Help support our independent journalism at theguardian.com/sciencepod

09/09/2025 • 19:43