Ancient DNA, Black Death, Pub Health Strategies and Smart Roads: Naked Scientists explores Cambridge science

Episode snapshot

This Naked Scientists episode surveys how ancient DNA from Cambridgeshire reveals the social and genetic impact of the Black Death, tests the plague’s effect on European genetics, and explores contemporaneous science spanning alcohol policy, road engineering and long Covid. It weaves together archaeogenomics, behavioral science, civil engineering and immunology with engaging interviews and expert insights.

Key topics: Cambridge ancient DNA study, Black Death population genetics, wine glass size effects on consumption, self-healing road materials and sensors, long Covid and complement system, audience questions on facial recognition and Stollen bread.

Overview

The podcast presents a multidisciplinary look at current science from Cambridge, beginning with archaeology and genetics. Archaeologists and geneticists analyzed human genomes from almost 300 individuals buried in Cambridgeshire before and after the Black Death, aiming to test the longstanding theory that the plague, which killed a large fraction of Europe’s population, would exert strong selective pressure on the surviving generation. The conversation centers on two Cambridge researchers and covers methods, findings, and broader implications for our understanding of medieval population dynamics and social structure. The segment situates the work within the wider question of how pandemics shape genetics, while acknowledging the complexity that mobility and diverse burial practices introduce to the interpretation of results. The hosts and guests discuss the methodology: extracting ancient DNA from individuals spanning a wide time window, distinguishing those likely exposed to plague from others, and comparing pre and post-pandemic groups for genetic differences. The researchers report that there is no statistically robust genetic difference between the before and after groups in Cambridgeshire, with only minor non-significant variations. This challenges the idea of a simple, gene-by-gene selection process driving European genetic evolution in response to the Black Death, though social changes and the broader social fabric of medieval life clearly did shift and rearrange populations over time. The discussion also touches on the plague’s transmission vectors, potential environmental changes, and why it disappeared, emphasizing that immunity is unlikely to be the sole driver and that multiple factors likely contributed.

Public health and behavioral insights

The episode then shifts to a public health topic: could pubs benefit from offering smaller wine portions to curb unhealthy drinking patterns? Eleni Manzari (a lecturer at City, University of London) explains a real-world field study conducted in 21 pubs across England. The study replaced the largest standard serving of wine with a smaller medium option (175 ml, with the top end typically 250 ml). Over 12 weeks, with four weeks of baseline, four weeks of restricted largest wine size, and four weeks of restoration, researchers tracked sales and accounted for weather, holidays and major events. They found that removing the largest glass reduced average wine sales by about 420 ml per venue per day, roughly 7.6 percent. Importantly the shift wasn’t simply a swap to the next larger size; many customers moved to the smallest wine glass (125 ml) and did not switch to beer or other beverages in the same period. The podcast discusses policy considerations, potential acceptability by the hospitality industry, and the limitations of extrapolating from one study. It also notes that wine glass sizes have increased since the 1990s, influencing pour sizes and consumer behavior, suggesting that laboratory findings may be amplified in real-world settings.

Engineering and sustainability in everyday life

Another major segment features Cambridge engineers exploring pothole management through data-driven, proactive maintenance. The interview with Professors Johannes Brilakis and Abir Al Tabar explains how modern cars generate large volumes of road-condition data via sensors and cameras, which could be used to build a cloud-based digital twin of the road network. The plan is to determine which defects warrant immediate repair and which can wait for routine maintenance, potentially patching defects before they form. They discuss self-healing road materials, including coatings and integrated healing capsules that release repair agents when cracks form. The project envisions autonomous repair vehicles and a resilient road network, acknowledging the long timeframe for network-wide updates and the challenge of funding in a transportation infrastructure that carries a large share of goods and people but remains underfunded.

Long Covid and immune regulation

The podcast then covers a seminal analysis on long Covid, where Professor Ona Bouman from Zurich explains how measuring a broad panel of proteins in blood can reveal a molecular fingerprint associated with persistent symptoms. The study highlights the complement system, an immune pathway typically activated during acute infection, which appears to remain overactive in some long Covid patients. The data show that in people who recover, complement activation normalizes over time, whereas for those with persistent symptoms it remains elevated. The discussion explores whether this overactive state is a cause or a consequence, possible feedback loops, and the potential for targeted therapies to tune down the complement system as a treatment strategy. The presenters emphasize that these findings may aid diagnosis and point to new therapeutic targets for long Covid.

Question of the Week and Q&A

The program includes a questions segment, starting with a query about why replacement intraocular lenses still allow facial recognition to function but biometrics can fail. Dr. Nikita Thomas explains how biometric face recognition relies on external eye landmarks and eyelid positions, which are not replaced by intraocular lenses, though eyelid position can be subtly altered by surgery. The guidance is to re-train facial recognition profiles for phones and apps, while noting software-specific issues as a potential cause. The show also teases a future question about Stollen bread to be addressed on a later episode.

Closing context

The Naked Scientists reiterates its Cambridge roots and collaboration with Spitfire for production and Epidemic Sound for music, with a nod to future Titans of Science coverage including Julie Williams on Alzheimer’s genetics. The episode illustrates the program’s mission to present credible, cutting-edge science across disciplines, linking past research to present-day challenges and policy questions.