Nuclear energy, robotic surgery, and planetary defense: Naked Scientists delves into Sizewell C, NHS robotics, YR4 and ancient whale bones

Episode snapshot

The Naked Scientists examine three big science stories: Britain's Sizewell C nuclear project and its cost debate, the NHS push to expand robotic surgery, and the near Earth object YR4 that could impact the Moon. The show also covers archaeologic discoveries of whale bone tools in Western Europe and a Q A on photons' size from quantum physics.

• UK nuclear policy and the merits of big reactors versus small modular reactors
• Robotic surgery as a means to reduce waiting lists and improve training with telemetry data
• Planetary defense through tracking near Earth objects and potential lunar impacts
• Ancient maritime technology revealed by whale bone tools dating over 20 000 years
• Photon size explained by wave-particle duality

Overview

The podcast presents a cross section of how science policy, technology, and discovery intersect in public discourse. The discussion threads three major domains: energy policy with nuclear power, advances in surgical robotics within the NHS, and planetary defense through near Earth object tracking, complemented by archaeology and quantum physics Q A. The guests provide policy perspectives, engineering realities, and scientific context to help listeners gauge where the science might lead and where the challenges lie.

Nuclear energy policy and Sizewell C

The episode opens with the UK government’s commitment to Sizewell C, a new nuclear power station on the Suffolk coast, with a claimed investment of about 14 billion pounds (roughly 30 billion dollars). The promise is to power millions of homes, create jobs, and accelerate a clean energy era. Opponents warn of ballooning costs, construction delays, and higher consumer bills. The discussion frames a central policy question: is the case for nuclear compelling when viewed through the lens of system wide decarbonization? The interview with Simon Taylor, energy policy and finance expert at Cambridge Judge Business School, highlights two recurring themes. First, nuclear is seen as a necessary part of a diverse energy mix, especially since wind and solar are intermittent. Second, the difficulty of delivering large scale nuclear projects is acknowledged, including overruns seen with Hinkley Point C. The government argues learning by doing will reduce risk with Sizewell C because it will be an identical copy of a prior design. The panel notes that capital costs for nuclear remain high versus other generation sources, but a full system view may still favor nuclear to avoid expensive redundancy that would be needed to decarbonize the last slices of electricity. The argument is that nuclear can offer low life cycle carbon emissions, which becomes a central consideration in climate policy.

Small modular reactors versus large plants

The conversation expands to compare the traditional large scale reactor model with the small modular reactor (SMR) concept. The idea is that mass produced, standardized modules could lower unit costs and reduce site preparation overheads. However, SMRs have yet to demonstrate commercial viability at scale, and the panel emphasizes that no designs have been proven in operation. The interview with Taylor notes that fixed costs of regulation and site security may still favor larger, fewer units, unless mass production achieves substantial cost reductions. The section also discusses module based cost dynamics and the role of government policy, financing, and risk transfer in making these projects economically viable.

Cost dynamics and carbon accounting

Beyond upfront capital costs, the long term economics include operating costs, fuel, maintenance, and the levelized cost of electricity. The dialogue compares these to alternatives like solar and wind, highlighting the challenge of decarbonizing the last few percent of demand. On a carbon basis, nuclear power often shows favorable life cycle emissions relative to fossil options, and policy analysis suggests that a decarbonized electricity system may benefit from maintaining some nuclear capacity to ensure reliability and baseload power, especially during periods of low wind or sunlight. The panel notes that quantitative models exist showing nuclear can be beneficial in system wide optimization, though the government has not yet presented a fully persuasive case to the public.

Robotics in NHS surgery

The show then shifts to robotics in surgery with NHS scale up planned to deliver more than half a million procedures per year, with claims of faster operations, shorter hospital stays, and reduced waiting times. Mark Slack of CMR Surgical explains how robotics can shorten learning curves for surgeons, enabling more people to perform minimally invasive (keyhole) surgery. The Versius robotic system is discussed in terms of training efficiency, surgical precision, and potential improvements in patient outcomes. Slack stresses the need for an evidence base: robotics will not replace all surgical approaches, and decisions must be data driven. The interview includes insights into the types of procedures that are immediately amenable to robotic assistance and notes for open vs robotic approaches in different contexts such as early stage cervical cancer or pediatric surgery, where the technology could offer meaningful safety benefits while awaiting broader clinical validation.

Autonomy and AI in surgery

The conversation touches on future autonomy in surgical robotics. Slack describes how the robot can support, not replace, surgeon skill, including a telemetry driven system that can quantify a surgeon's performance and even distinguish novice from expert technique with high accuracy. While autonomous surgery seemed unlikely two years ago due to physiological movement like respiration, the rapid pace of AI and software driven robotics raises the possibility of increasing autonomy in select contexts. The panel agrees that the evidence base must be built through controlled, rigorous trials to determine where autonomous functions may be called for and where human oversight remains essential.

Near Earth Objects, YR4 and planetary defense

The podcast then covers astronomy and planetary defense with YR4, an asteroid of roughly 50 to 60 meters in diameter, which initially posed a potential, though very small, threat to Earth. New observations with the James Webb Space Telescope refined its trajectory, indicating a 4.3 percent chance of impacting the Moon in December 2032. While the risk to Earth is downgraded toward near zero, the event would be astrophysically valuable, providing a moment for observation by both ground-based telescopes and space missions. The discussion underscores the importance of tracking near Earth objects with precision to support any potential deflection actions if needed in the future. The segment also includes perspectives from Sarah Russell at the Natural History Museum on Bennu, an asteroid visited by a sample mission, and how the Moon impact could illuminate impact cratering studies used for age dating planetary surfaces.

Archaeology of ancient whale bone tools

The program features archaeology from France and Spain where researchers analyzed whale bone tools dating back 20 000 years. Jean Marc Petion explains how bone and antler devices made from large whales were used as projectile points or parts of hunting equipment. The study used direct sampling and modern techniques like paleoproteomics to identify whale species and radiocarbon dating via MICADAS microcarbon dating to establish dates from small fragments. The findings suggest that some items traveled hundreds of kilometers, opening questions about trade and movement among prehistoric groups along the Gulf of Biscay and into the Pyrenees. The absence of seafaring or island settlements at the time makes drifted or stranded whales a likely source, rather than direct hunts at distance. This discovery sheds light on early exploitation of marine resources and potential exchange networks in prehistoric Western Europe.

Question of the Week: How big is a photon

The final segment explores a quantum question about the size of a photon. The guest, Ben Allenack, explains that a photon is a quantum object with wave particle duality. Photons have no mass or internal structure, so they do not have a conventional size. However, when detected, the interaction is with something of a wavelength corresponding to the photon's energy, so the effective size can be thought of in terms of wavelength. The discussion emphasizes that photons act as waves in some contexts and as particles when absorbed, leading to the conclusion that a photon's size is not a fixed object property but a property dependent on how it is measured or interacted with. The explanation provides intuitive examples, such as radio waves requiring antennas of matching wavelengths and visible light having roughly 500 nanometer wavelengths.

Conclusion and where to learn more

The podcast closes with a prompt to visit thenakedscientist.com for extended interviews and additional material, including more on Bennu and other topics discussed, as well as a note about the program’s association with the Cambridge Institute of Continuing Education and Rolls Royce support.