Science Weekly

Prof Channa Jayasena, clinical professor in reproductive endocrinology and andrology at Imperial College London and chair of the Society for Endocrinology, explains how social media is fueling a craze for testosterone. Short segments cover targeted clinic marketing, testing pitfalls, when treatment is truly needed, fertility and health risks, and how lifestyle changes can restore levels.

Mohammad Shamsudduha, a UCL professor specializing in groundwater and water-risk solutions, and Patrick Wintour, The Guardian diplomatic editor reporting on Iran’s water collapse, discuss collapsing lakes, Tehran’s looming supply crises, drivers like overpumping and governance failure, and what ‘water bankruptcy’ means for agriculture, economies and policy. They explore monitoring, unconventional supplies and the role of climate as a threat multiplier.

Ian Sample, The Guardian's science editor, and Dr. Michael Head, a public health researcher, dive into fascinating science stories. They discuss a study showing how positive thinking may enhance immune response. Dr. Head sheds light on the rising scabies cases in the UK, tackling symptoms, transmission challenges, and stigma. The duo also uncovers the surprising intelligence of cows, focusing on a cow named Veronica, who has been documented using tools. Their insights reveal the underestimated cognitive abilities of these animals.

Damian Carrington, the Environment editor at The Guardian and a seasoned investigative reporter, joins to discuss the controversial topic of microplastics in human bodies. He reveals how recent studies have raised alarm but also skepticism among scientists regarding contamination issues. Damian explains the analytical mistakes that can lead to false positives and the lack of solid evidence linking microplastics to health problems. He highlights the need for standardized research protocols and offers practical tips for individuals to minimize exposure.

Dr. Michelle Carr is the Director of the Dream Engineering Laboratory and author of *Into the Dream Lab*, specializing in dream science and nightmares. She explores why we dream and what our dreams can teach us about ourselves. The discussion touches on how dreams aid memory consolidation and can serve as rehearsal for waking challenges. Dr. Carr shares tips for influencing dream content and addresses nightmares, discussing their links to stress and trauma, plus the benefits of imagery rehearsal therapy for reducing them.

Dr. Allie Hare, a consultant physician in respiratory and sleep medicine and president of the British Sleep Society, shares her insights on improving sleep quality. She explains how menopause affects sleep due to hormonal changes and stresses the importance of seeking treatment. The discussion covers sleep paralysis triggers and the disturbing link between poor sleep and dementia. Dr. Hare also offers practical tips for better sleep in 2026, emphasizing routines, exercise, and the timing of caffeine and alcohol.

Hannah Devlin, a seasoned science correspondent known for her insights on biomedical, space, and energy stories, joins Ian Sample to discuss future scientific breakthroughs. They dive into the potential of universal anti-venom and groundbreaking gene-editing technologies. The conversation covers the ambitious missions of the Euclid telescope and upcoming space explorations like Artemis II and SpaceX's Mars plans. They also explore the promising advancements in fusion energy, raising hopes for a sustainable power source.

Jillian Ambrose, Guardian's energy correspondent, dives into the U.S. raid on Venezuela, unpacking Trump's claims about stolen oil rights. She reveals why Venezuelan oil is appealing — it's rich in heavy crude and has vast reserves that are currently underutilized. Ambrose also explores the history of U.S. involvement in Venezuela's oil sector, the challenges facing American companies due to outdated infrastructure, and China's strong connection to Venezuelan oil flows. Overall, it’s a captivating look at geopolitics and energy markets.

Kevin Hall, a former physician-scientist renowned for his research on ultra-processed foods and weight regulation, joins the discussion to unravel the intricacies of diet and metabolism. He explains how our bodies resist weight change through metabolic adaptations and the role of appetite. Hall critiques the limited effectiveness of exercise for weight loss and sheds light on the issues with ultra-processed foods that lead to excessive calorie intake. He also recounts his departure from the NIH due to censorship, advocating for scientific integrity in nutrition research.

Prof. Nik Money, a seasoned mycologist and author, dives into the booming world of medicinal mushrooms. He explains the biological wonders of fungi and their relation to molds and yeasts. They discuss the shaky scientific evidence supporting health claims and identify promising research areas like lion's mane and its potential benefits. The popularity of these products is linked to wellness trends and a desire to reconnect with nature. While mushrooms offer some nutritional benefits, Money emphasizes skepticism regarding their medicinal properties.