Melanoma, Postpartum Brain, Artificial Eggs, and Coffee Voltammetry

Episode snapshot

The Naked Scientists offer a multidisciplinary look at health, neuroscience, biotech and food science in this episode, weaving together four main stories into one show. Topics include skin cancer risk and prevention, brain remodeling after pregnancy, a biotech venture to resurrect extinct birds with artificial eggs, and a novel voltammetry approach to quantify coffee flavor for quality control.

• Melanoma rises in the UK linked to aging, UV exposure, sunbeds and travel, with emphasis on early detection and skin protection.
• Pregnancy and postpartum can remodel the female brain, with dopamine driving lasting changes in learning, memory and maternal behaviors.
• Colossal Biosciences describes artificial eggs enabling resurrection of extinct birds via surrogates and engineered eggs, including titanium shells and gas-permeable membranes.
• A voltammetry based approach maps coffee flavor to roast strength, offering objective quality control for cafes and roasters.

Overview

The podcast begins by assessing how heat and rising melanoma rates intersect with public health messaging in the UK, then moves to a deep dive into the biology of motherhood and brain remodeling. It shifts to an audacious biotech case study on de-extinction and artificial eggs, followed by a discussion of a new analytical technique for measuring coffee flavor using voltammetry. Across these segments, listeners are invited to consider how science translates into practical health guidance, fundamental biology, industry, and everyday experiences like coffee tasting.

Melanoma and skin cancer risk in the UK

The episode reports on May heat and UK melanoma statistics, highlighting that melanoma is among the more dangerous skin cancers precisely because of its potential to spread. An expert explains the disease's relation to ultraviolet light exposure, including long term risks from childhood sunburn, outdoor activity, and artificial UV sources such as sunbeds. The discussion covers how melanoma affects younger populations and the overall need to monitor skin changes. It also emphasizes that early detection dramatically increases cure rates, underscoring the importance of regular skin checks and medical assessment for changes in moles or patches. Practical sun protection advice is given, including avoiding peak sun hours, wearing protective clothing, and using broad spectrum sunscreen with UVA and UVB protection, reapplied every two hours on sunny days. Additionally, the segment explains how public health messaging must balance awareness with practical behavior change to reduce exposure while not overburdening outdoor activity and travel plans.

Pregnancy, motherhood and brain remodeling

The podcast then features Jennifer Ochan from Icahn School of Medicine at Mount Sinai discussing the brain after pregnancy. The researchers used mouse models to explore how pregnancy and postpartum experiences alter brain structure and function months after giving birth. They found that dopamine plays a central role in remodeling neural circuits, with epigenetic changes in the hippocampus linked to improvements in learning and memory and maternal behaviors. The conversation clarifies that while the brain can return to baseline for some, there may be a new functional state that better supports parenting. Hormonal interactions with estrogen and oxytocin likely regulate downstream dopamine signaling, pointing to a complex network rather than a single driver. The take-home message is that postpartum brain changes may be adaptive but potentially sensitive to stress during critical periods, reinforcing the need to protect new parents from stress to foster healthy brain adaptations for parenting roles.

Artificial eggs and de-extinction biology

The show then turns to Colossal Biosciences, where Ben Lamb discusses the creation of artificial eggs to enable the birth of extinct birds such as the dodo or the giant moa. The method involves editing primordial germ cells and using a surrogate species, such as an emu, capable of producing the edited eggs. For species with no suitable surrogate due to size, an artificial egg is designed to gestate embryos outside a natural egg. The team has produced a fully functional artificial egg that can support incubation for a day, enabling embryo development. They use a titanium printed shell and a gas permeable membrane to enable gas exchange at normal atmospheric conditions, with a design that allows imaging and tracking of development at various stages. The interview also covers the challenges of providing yolk-like nutrient support and considerations for large eggs that would be needed to gestate flightless birds like moa. The segment ends with a reflection on the ethical and ecological implications of reviving extinct species and the substantial technical hurdles ahead for scaling this approach.

Voltammetry and coffee flavor

The final science story discusses a novel voltammetry technique used to measure coffee flavor. Christopher Hendon explains how applying electrical voltages causes current to flow through solution-phase coffee molecules, enabling a quantitative fingerprint for flavor compounds. The method targets families of molecules that respond to voltage rather than measuring caffeine alone, seeking correlations with roast level rather than subjective taste. By mapping current responses to roast darkness, researchers can generate objective quality metrics that could be used by cafes and roasters to standardize flavor profiles. The conversation also acknowledges the subjectivity of tasting and the limitations of mechanistic taste prediction, but emphasizes the potential for improved consistency and quality control across the coffee industry.

Conclusion

The podcast closes by pointing to a Nature Communications publication describing the coffee voltammetry approach and previews an upcoming Ebola outbreak segment. Viewers are reminded that the show aims to make science accessible and relevant to everyday life through diverse topics that span health, biology, biotechnology and food science.