Decoding ancient scrolls and edible batteries: Nature Briefing explores Vesuvius scrolls and dissolvable biomedical power

Two science stories in this week\'s Nature Briefing

The podcast highlights two Nature stories that push the boundaries of reading the past and powering the future inside the body. First, researchers recreate and test ancient scrolls from Herculaneum to find a way to read the hidden text by detecting lead in the ink with X-ray methods, aided by CT scanning and AI when distinguishing ink from papyrus. Second, a dissolvable battery made with magnesium and molybdenum trioxide, a cellulose paper composite, a biodegradable ionic liquid, and beeswax shows potential to power ingestible medical devices and dissolve safely in the stomach after use. The episode also notes the Vesuvius Challenge and invites readers to explore the Nature Briefing linked in the show notes.

• Archaeology and ancient texts reimagined with modern imaging and AI
• In-body electronics powered by edible, dissolvable batteries
• Cross-disciplinary work spanning archaeology, imaging, materials science and biomedical engineering
• Publications and calls to action around deciphering scrolls and advancing safe, dissolvable implants

Long-form summary: deciphering charred scrolls and dissolvable batteries

The podcast opens with a light exchange between Benjamin and Sharmini as they introduce two Nature Briefing stories featured in the Nature daily roundup. The structure mirrors a typical brief: a concise setup followed by deeper dives into the scientific methods, findings, and potential implications. The overarching theme is the use of advanced imaging, materials science, and data-driven approaches to access information that would previously have remained locked away by time and biology.

Section 1: Archaeology and the Vesuvius scrolls

The first major topic centers on the nearly two-thousand-year-old scrolls found in the Villa della Papyri at Herculaneum, a site destroyed by the eruption of Mount Vesuvius. Many of these scrolls were charred into lumps, rolled tight, and believed to contain a treasure trove of philosophical and literary works. Traditional unrolling methods risk shattering the fragile scrolls, so researchers are pursuing non-destructive approaches to access their contents. The Nature paper described in the briefing presents a strategy focused on ink lead detection. The ink used to write the scrolls would contain lead, a residue that can be picked up by X-ray fluorescence (XRF). In this study, the team created synthetic scrolls by combining papyrus, native Egyptian reed pens, and lamp-black ink from Japan to approximate authentic materials, then rolled these scrolls and exposed them to furnace-like conditions to replicate volcanic environments. Using XRF, they were able to distinguish the lead in the ink from the papyrus, providing a readable signal. The imaging signals were also captured in a way that produced glowing text on fluorescent scanners, a visualization that helps researchers verify the presence of writing and the letter shapes in a controlled setting.

In parallel with the XRF approach, researchers have relied on CT scanning to read scrolls. Previous work demonstrated that subtle carbon traces in inks can be decoded with machine-learning algorithms that separate ink from the papyrus background in CT images. There have been successes this year in reading original content from scrolls through CT-based methods. The new paper contributes a complementary method: a controlled environment in which the exact text is known because the scrolls were simulated. This allows for algorithm training and refinement, enabling more precise identification of ink letters in real scrolls where the text remains uncertain. The researchers hope that their approach can be extended to real artifacts if the technique can successfully detect lead signals within the ink under diverse conditions and with various ink formulations.

The discussion acknowledges the practical considerations of applying these results to authentic scrolls. While the method shows promise, the team recognizes that real scrolls may present additional complexities such as varying ink formulations, ink density, and papyrus aging. The Vesuvius Challenge, an ongoing community effort to decipher these scrolls, is framed as a collaborative and competitive space where teams share tools, datasets, and datasets generated from faithfully reproduced scrolls. The article emphasizes that training algorithmic models on controlled, known-text scrolls can provide a robust baseline for decipherment efforts and can refine the interpretation of AI-assisted readings when working with genuine artifacts. In broader terms, the work illustrates how bridging historical material culture with modern imaging and machine learning can illuminate lost chapters of scientific and philosophical thought from antiquity.

Section 2: Edible batteries for in-body devices

The second feature shifts to a different branch of materials science: biologically safe, edible, and dissolvable batteries designed to power devices inside the body. The researchers describe a battery built with magnesium and molybdenum trioxide as electrodes, with a cellulose-based paper composite acting as the structural and electrolyte-supporting component. They also used a biodegradable ionic liquid as the electrolyte and coated the whole assembly with beeswax to slow the interaction with stomach acid. Gastric-fluid simulations show that the device begins to disintegrate within a couple of weeks and dissolves over months, indicating potential for temporary implants that do not require retrieval after completing their function.

In addition to the core battery chemistry, the researchers packaged fully biodegradable, non-toxic electronics inside gel capsules. They tested these capsules in pigs to evaluate feasibility in a living system. One example uses the dissolvable battery to power an RFID tracking device, enabling external monitoring of a capsule or a device inside the body. Another test involved using the battery to power a device that electrically stimulated the stomach, which increased ghrelin levels, a hunger hormone. This raises the possibility of non-surgical methods to modulate the gut-brain axis, an area of growing interest for metabolic and digestive health research. The researchers note that while the results are promising, there are still many steps on the path to human clinical use, including scaling up production, ensuring complete biocompatibility, and rigorous testing in humans.

The briefing underscores that several groups are pursuing biodegradable batteries, with varying degrees of maturity. The discussed study presents a performance level that is comparable to other biodegradable battery approaches and emphasizes the potential to integrate singificantly less invasive medical devices into routine healthcare. The researchers express optimism about progressing toward human trials and, in the meantime, highlight the importance of safety, regulatory considerations, and long-term biocompatibility. Across both the ancient-scrolls and edible-battery topics, the podcast frames these investigations as vivid demonstrations of how new imaging techniques and material designs can open doors to knowledge and healthcare innovations that were previously out of reach.

Cross-cutting themes and implications

Two major themes emerge. First, the role of non-destructive imaging and analytic methods in reading what time has obscured—whether it is ancient text or biological devices within the human body. Second, the importance of controlled experiments and training data for new AI-driven analyses. In the scroll study, controlled reproductions of scrolls with known text provide a valuable training ground for algorithms that could one day interpret real artifacts. In the battery study, careful design choices to ensure safe dissolution in gastric conditions and in vivo testing in animals pave the way toward medical applications that minimize invasive interventions. The podcast closes by inviting listeners to follow the Nature Briefing for more science coverage and to consider the broader implications of these advances for archaeology, medicine, and bioengineering. The show remains mindful of the complexities of translating these discoveries into real-world practice, including safety, ethics, and regulatory processes.

Conclusion

Overall, the podcast demonstrates how modern technologies can illuminate ancient knowledge and improve human health through innovative materials science. The cross-disciplinary nature of both studies—combining archaeology, imaging, and AI in one case, and chemistry, biology, and biomedicine in the other—highlights the collaborative, integrative approach that a platform like Future Factual aims to showcase for trusted STEM content. The episodes encourage curiosity while anchoring discussion in rigorous methods and cautious, stepwise progress toward real-world impact.