In brain-computer interfaces (BCIs) and other neural implant systems, electrodes serve as the critical interface and are core sensors linking electronic devices with biological nervous systems. Most currently implanted electrodes are static: Once positioned, they remain fixed, sampling neural activity from only a limited region. Over time, they often elicit immune responses, suffer signal degradation, or fail entirely, which has hindered the broader application and transformative potential of BCIs.

In a study published in Nature, a team led by Prof. Liu Zhiyuan, Prof. Xu Tiantian and Assoc. Prof. Han Fei from the Shenzhen Institute of Advanced Technology of the Chinese Academy of Sciences, along with Prof. Yan Wei from Donghua University, have reported a soft, movable, long-term implantable fiber electrode called “NeuroWorm,” marking a radical shift for bioelectronic interfaces from static operation to dynamic operation and from passive recording to active, intelligent exploration.

The design of NeuroWorm is inspired by the earthworm’s flexible locomotion and segmented sensory system. By employing sophisticated electrode patterning and a rolling technique, the researchers transformed a two-dimensional array on an ultrathin flexible polymer into a tiny fiber approximately 200 micrometers in diameter.

The tiny NeuroWorm integrates up to 60 independent signal channels along its length, resembling a highly sophisticated sensory highway. Crucially, the tip of the fiber is equipped with a small magnetic module, enabling wireless steering of the implanted device via external magnetic fields. With this setup, NeuroWorm effectively records high-quality spatiotemporal signals in situ while being steered within the brain or along muscle tissue as needed.

To validate NeuroWorm’s ability to navigate within muscle fascia, the researchers implanted it through a minimally-invasive, half-centimeter incision in a rat and then used external magnets to guide its daily movement across muscle surfaces. X-ray images showed the biomimetic motion, which resembles a microscale bionic worm gliding smoothly between tissue layers.

During the seven-day post-implantation period, the device demonstrated the capability to relocate across various positions while concurrently capturing clear and stable electromyographic (EMG) signals from all channels. This functionality effectively realizes dynamic and precise monitoring with the principle of “measurement on demand at targeted locations.”

The researchers implanted a single NeuroWorm in a rat’s leg muscle for over 43 weeks, during which it continuously and stably recorded EMG signals. The fibrotic encapsulation thickness was less than 23 micrometers, much thinner than the 451 micrometers typically observed with conventional rigid electrodes. In addition, the researchers navigated the NeuroWorm through a rabbit’s brain, guiding it from the cortex into subcortical regions while capturing high-quality neural signals throughout its trajectory. These examples underscore the device’s biocompatibility and long-term stability.

This study provides a solution to enable noninvasive repositioning of implants via magnetic guidance, potentially eliminating surgeries due to drift or misplacement. NeuroWorm offers a smarter, softer, and less invasive platform for long-term, multisite neural monitoring with potential applications in BCls, smart prosthetics, epilepsy mapping, and the management of chronic neurological disorders.

Nvidia CEO Jensen Huang is in London, standing in front of a room full of journalists, outing himself as a huge fan of Gemini’s Nano Banana. “How could anyone not love Nano Banana? I mean Nano Banana, how good is that? Tell me it’s not true!” He addresses the room. No one responds. “Tell me it’s not true! It’s so good. I was just talking to Demis [Hassabis, CEO of DeepMind] yesterday and I said ‘How about that Nano Banana! How good is that?’”

It looks like lots of people agree with him: The popularity of the Nano Banana AI image generator—which launched in August and allows users to make precise edits to AI images while preserving the quality of faces, animals, or other objects in the background—has caused a 300 million image surge for Gemini in the first few days in September already, according to a post on X by Josh Woodward, VP of Google Labs and Google Gemini.

Huang, whose company was among a cohort of big US technology companies to announce investments into data centers, supercomputers, and AI research in the UK on Tuesday, is on a high. Speaking ahead of a white-tie event with UK prime minister Keir Starmer (where he plans to wear custom black leather tails), he’s boisterously optimistic about the future of AI in the UK, saying the country is “too humble” about the country’s potential for AI advancements.

He cites the UK’s pedigree in themes as wide as the industrial revolution, steam trains, DeepMind (now owned by Google), and university researchers, as well as other tangential skills. “No one fries food better than you do,” he quips. “Your tea is good. You’re great. Come on!”

Nvidia announced a $683 million equity investment in datacenter builder Nscale this week, a move that—alongside investments from OpenAI and Microsoft—has propelled the company to the epicenter of this AI push in the UK. Huang estimates that Nscale will generate more than $68 billion in revenues over six years. “I’ll go on record to say I’m the best thing that’s ever happened to him,” he says, referring to Nscale CEO Josh Payne.

“As AI services get deployed—I’m sure that all of you use it. I use it every day and it’s improved my learning, my thinking. It’s helped me access information, access knowledge a lot more efficiently. It helps me write, helps me think, it helps me formulate ideas. So my experience with AI is likely going to be everybody’s experience. I have the benefit of using all the AI—how good is that?”

The leather-jacket-wearing billionaire, who previously told WIRED that he uses AI agents in his personal life, has expanded on how he uses AI (that’s not Nano Banana) for most daily things, including his public speeches and research.

“I really like using an AI word processor because it remembers me and knows what I’m going to talk about. I could describe the different circumstance that I’m in and yet it still knows that I’m Jensen, just in a different circumstance,” Huang explains. “In that way it could reshape what I’m doing and be helpful. It’s a thinking partner, it’s truly terrific, and it saves me a ton of time. Frankly, I think the quality of work is better.”

His favorite one to use “depends on what I’m doing,” he says. “For something more technical I will use Gemini. If I’m doing something where it’s a bit more artistic I prefer Grok. If it’s very fast information access I prefer Perplexity—it does a really good job of presenting research to me. And for near everyday use I enjoy using ChatGPT,” Huang says.

“When I am doing something serious I will give the same prompt to all of them, and then I ask them to, because it’s research oriented, critique each other’s work. Then I take the best one.”

In the end though, all topics lead back to Nano Banana. “AI should be democratized for everyone. There should be no person who is left behind, it’s not sensible to me that someone should be left behind on electricity or the internet of the next level of technology,” he says.

“AI is the single greatest opportunity for us to close the technology divide,” says Huang. “This technology is so easy to use—who doesn’t know how to use Nano?”

Because lithium is relatively scarce and sodium is abundant in Earth’s crust, sodium-ion batteries are being investigated as viable, cost-effective alternatives to the widely used lithium-ion batteries. In these batteries, the choice of cathode material primarily influences battery capacity and stability.

Layered sodium manganese oxides (Na_2/3MnO₂) have attracted significant attention in recent years as cathode materials for high-capacity sodium-ion batteries without using any rare-earth metals. However, while these materials exhibit high initial capacity, their rapid capacity fading during charge-discharge cycling remains a significant challenge.

During charge-discharge cycling of NaMnO₂ electrodes, Na⁺ ions are constantly inserted and extracted from the cathode material. This is accompanied by changes in the oxidation states of manganese (Mn) between Mn³⁺ to Mn⁴⁺. When Mn³⁺ ions form, they distort their surrounding lattice to lower electronic energy, a phenomenon known as Jahn-Teller distortion.

Over time, these repeated distortions lead to a buildup of strain at both atomic and particle levels in NaMnO₂, eventually resulting in the loss of crystallinity and severe capacity degradation. This is the main cause of capacity loss during cycling of Na_2/3MnO₂ electrodes. Recent studies have attempted to address this issue by substituting metals at Mn sites.

In a recent study, a research team led by Professor Shinichi Komaba, along with Mr. Kodai Moriya and Project Scientist Dr. Shinichi Kumakura, from the Department of Applied Chemistry at Tokyo University of Science, Japan, revealed how scandium (Sc) doping can dramatically improve the cycling stability of P’2 polytype of Na_2/3MnO₂ electrodes.

“Previously, we discovered that Sc doping in P’2 Na_2/3[Mn_1-xSc_x]O₂ electrodes can improve the battery performance and long-term stability,” explains Prof. Komaba. “However, the exact mechanism for this improvement remains unresolved, and it was unclear whether this effect is generally applicable. In this study, we systematically studied P2 and P’2 polytypes of Na_2/3[Mn_1-xSc_x]O₂ to understand the role of Sc doping.”

Their study was published in the journal Advanced Materials on September 12, 2025.

The crystal structure of Na_2/3MnO₂ has several polytypes, which differ in several aspects. A key difference between the P2 and P’2 polytypes is that former exhibits localized Jahn-Teller distortions, while the latter features cooperative Jahn-Teller distortion where the distortions are aligned in a long-range order. The researchers conducted a series of experiments on both doped and undoped samples of each polytype containing varying amounts of Sc.

Structural tests revealed that Sc doping in P’2 Na_2/3[Mn_1-xSc_x]O₂ effectively modulates its structure, resulting in smaller particles and altered crystal growth, while preserving cooperative Jahn-Teller distortion and superstructure. This significantly improves structural stability. In addition, the team found that Sc doping prevents side reactions with liquid electrolytes and enhances moisture stability by forming a cathode-electrolyte interface layer.

As a result, in Na-half-cell tests, the Sc-doped P’2 type Na_2/3[Mn_1-xSc_x]O₂ electrodes demonstrated a substantial improvement in cycling stability. The sample with 8% Sc doping was found to have optimal performance.

The researchers also found that unlike non-doped samples, the crystallinity of the doped samples was remarkably maintained during cycling. Interestingly, Sc doping did not improve the cycling stability of P2 NaMnO₂ electrodes, indicating a specific synergy between Sc doping and cooperative Jahn-Teller distortion. Furthermore, doping with other similar metal cations, like ytterbium and aluminum, did not reduce capacity fading, highlighting the unique role of Sc.

They also tested the effect of pre-cycling, a common technique to improve cycle life, which further improved capacity retention in the doped P’2 Na_2/3[Mn_1-xSc_x]O₂ electrodes. Building upon these results, the researchers fabricated coin-type full cells using the 8% Sc-doped P’2 Na_2/3[Mn_1-xSc_x]O₂ electrodes, which demonstrated an impressive 60% capacity retention after 300 cycles.

“Since Sc is an expensive metal, our study demonstrates its feasibility in the development of batteries. Our findings can potentially lead to development of high-performance and long-life sodium-ion batteries,” says Prof. Komaba, highlighting the importance of their research.

“Moreover, beyond sodium-ion batteries, our study illustrates a new strategy to extend the structural stability of layered metal oxides involving the lattice distortion and improve the performance of batteries made using these materials.”

Overall, this study demonstrates the unique role of Sc doping for improving cycling stability of sodium-ion batteries, paving the way for their broader adoption.