Tech
A new type of electrically driven artificial muscle fiber
Muscles are remarkably effective systems for generating controlled force, and engineers developing hardware for robots or prosthetics have long struggled to create analogs that can approach their unique combination of strength, rapid response, scalability, and control. But now, researchers at the MIT Media Lab and Politecnico di Bari in Italy have developed artificial muscle fibers that come closer to matching many of these qualities.
Like the fibers that bundle together to form biological muscles, these fibers can be arranged in different configurations to meet the demands of a given task. Unlike conventional robotic actuation systems, they are compliant enough to interface comfortably with the human body and operate silently without motors, external pumps, or other bulky supporting hardware.
The new electrofluidic fiber muscles — electrically driven actuators built in fiber format — are described in a recent paper published in Science Robotics. The work is led by Media Lab PhD candidate Ozgun Kilic Afsar; Vito Cacucciolo, a professor at the Politecnico di Bari; and four co-authors.
The new system brings together two technologies, Afsar explains. One is a fluidically driven artificial muscle known as a thin McKibben actuator, and the other is a miniaturized solid-state pump based on electrohydrodynamics (EHD), which can generate pressure inside a sealed fluid compartment without moving parts or an external fluid supply.
Until now, most fluid-driven soft actuators have relied on external “heavy, bulky, oftentimes noisy hydraulic infrastructure,” Afsar says, “which makes them difficult to integrate into systems where mobility or compact, lightweight design is important.” This has created a fundamental bottleneck in the practical use of fluidic actuators in real-world applications.
The key to breaking through that bottleneck was the use of integrated pumps based on electrohydrodynamic principles. These millimeter-scale, electrically driven pumps generate pressure and flow by injecting charge into a dielectric fluid, creating ions that drag the fluid along with them. Weighing just a few grams each and not much thicker than a toothpick, they can be fabricated continuously and scaled easily. “We integrated these fiber pumps into a closed fluidic circuit with the thin McKibben actuators,” Afsar says, noting that this was not a simple task given the different dynamics of the two components.
A key design strategy was to pair these fibers in what are known as antagonistic configurations. Cacucciolo explains that this is where “one muscle contracts while another elongates,” as when you bend your arm and your biceps contract while your triceps stretch. In their system, a millimeter-scale fiber pump sits between two similarly scaled McKibben actuators, driving fluid into one actuator to contract it while simultaneously relaxing the other.
“This is very much reminiscent of how biological muscles are configured and organized,” Afsar says. “We didn’t choose this configuration simply for the sake of biomimicry, but because we needed a way to store the fluid within the muscle design.” The need for an external reservoir open to the atmosphere has been one of the main factors limiting the practical use of EHD pumps in robotic systems outside the lab. By pairing two McKibben fibers in line, with a fiber pump between them to form a closed circuit, the team eliminated that need entirely.
Another key finding was that the muscle fibers needed to be pre-pressurized, rather than simply filled. “There is a minimum internal system pressure that the system can tolerate,” Afsar says, “below which the pump can degrade or temporarily stop working.” This happens because of cavitation, in which vapor bubbles form when the pressure at the pump inlet drops below the vapor pressure of the liquid, eventually leading to dielectric breakdown.
To prevent cavitation, they applied a “bias” pressure from the outset so that the pressure at the fiber pump inlet never falls below the liquid’s vapor pressure. The magnitude of this bias pressure can be adjusted depending on the application. “To achieve the maximum contraction the muscle can generate, we found there is a specific bias pressure range that is optimal,” she says. “If you want to configure the system for faster response, you might increase that bias pressure, though with some reduction in maximum contraction.”
Cacucciolo adds that most of today’s robotic limbs and hands are built around electric servo motors, whose configuration differs fundamentally from that of natural muscles. Servo motors generate rotational motion on a shaft that must be converted into linear movement, whereas muscle fibers naturally contract and extend linearly, as do these electrofluidic fibers.
“Most robotic arms and humanoid robots are designed around the servo motors that drive them,” he says. “That creates integration constraints, because servo motors are hard to package densely and tend to concentrate mass near the joints they drive. By contrast, artificial muscles in fiber form can be packed tightly inside a robot or exoskeleton and distributed throughout the structure, rather than concentrated near a joint.”
These electrofluidic muscles may be especially useful for wearable applications, such as exoskeletons that help a person lift heavier loads or assistive devices that restore or augment dexterity. But the underlying principles could also apply more broadly. “Our findings extend to fluid-driven robotic systems in general,” Cacucciolo says. “Wherever fluidic actuators are used, or where engineers want to replace external pumps with internal ones, these design principles could apply across a wide range of fluid-driven robotic systems.”
This work “presents a major advancement in fiber-format soft actuation,” which “addresses several long-standing hurdles in the field, particularly regarding portability and power density,” says Herbert Shea, a professor in the Soft Transducers Laboratory at Ecole Polytechnique Federale de Lausanne in Switzerland, who was not associated with this research. “The lack of moving parts in the pump makes these muscles silent, a major advantage for prosthetic devices and assistive clothing,” he says.
Shea adds that “this high-quality and rigorous work bridges the gap between fundamental fluid dynamics and practical robotic applications. The authors provide a complete system-level solution — characterizing the individual components, developing a predictive physical model, and validating it through a range of demonstrators.”
In addition to Afsar and Cacucciolo, the team also included Gabriele Pupillo and Gennaro Vitucci at Politecnico di Bari and Wedyan Babatain and Professor Hiroshi Ishii at the MIT Media Lab. The work was supported by the European Research Council and the Media Lab’s multi-sponsored consortium.
You could argue, and people have, that the top gay dating apps are now optimized for monetization and juicing engagement loops. Increasingly overrun with bots, they are at times even devoid of actual connection.
Grindr, with its 15 million monthly active users, is drowning in ads while pushing expensive upsells on users. (In February, as part of its “gAI” overhaul, the company announced a new premium monthly subscription tier for $500.) Sniffies was beloved by cruisers until the seismic reaction in April to Match Group’s $100 million investment sparked concerns that another queer space could get absorbed into a larger dating conglomerate.
As public backlash against popular queer apps continues to mount, a batch of tech entrepreneurs are scrambling to meet the demand by doubling down on privacy-conscious, community-driven alternatives.
Calum Bowden, who posts under the internet persona @donjackoghue, launched MeetMarket in March. Currently only available as a web app, MeetMarket includes all the core features of your typical hookup app—a customizable profile, a grid of nearby users—with one major difference. It was built on a decentralized identity system, meaning MeetMarket doesn’t store users’ emails, passwords, or personal information. Users store everything on their device, giving them full control and ownership over their data and how it’s shared. Messages on the platform are end-to-end encrypted, and Bowden says it will always be ad-free, even for nonpaying members. (A monthly membership costs €12, or $13.99.)
“Decentralization and data privacy make a lot of sense for queer people in general, and especially in hostile legal environments or in the US right now, where you don’t really know what digital platforms actually have your best interest in mind,” says the 34-year-old PhD student in Berlin who studies the sociology of technology and organization.
Within the first 48 hours of MeetMarket’s launch on March 24, over 12,000 people had signed up, and some 60,000 people have used it since. The app averages 5,000 weekly visitors, according to Bowden, though there is not a lot of concurrent activity in the same cities. “It’s become more social than necessarily driving an immediate hookup.” But casual encounters do still happen, he says. “The Midwest bottom jockeys are eating meet market up,” one user noted on X.
Bowden didn’t anticipate public sentiment would sour on Sniffies just a few weeks after his launch. Still, the timing of it couldn’t have been more serendipitous. “When Sniffies announced their investment from Match Group, I was like, how are they fueling my fire?” he asks. “This is exactly the model that venture capital leads to. This is exactly why these economic models for technology are so bad, because they basically force the gentrification of a digital platform.” Sniffies did not immediately respond to a request for comment.
A self-described “utopian conspirator,” Bowden is the cofounder of Trust, a nonprofit that operates as a kind of incubator to prototype ideas “as a critique of technology and the status quo,” he says. With MeetMarket, he wanted to create an app that gave users more agency over their experience without cheapening it.
It can sometimes seem like Big Dating wants people to believe that it is the only answer to cure their romantic woes—Bumble CEO Whitney Wolfe Herd recently told Axios that there isn’t much longevity in niche apps—but the opposite is proving just as true, as people seek out more specificity and intention in their online dating experience.
“Gay men have tribes, subcultures, aesthetics, and different ways they want to be seen,” says Justin Finnegan, a 35-year-old software engineer in Toronto who last year created Chunkr, a gay hookup app that has resonated with bears, chubs, cubs, and their admirers despite originally being for all gay men.
As we get out of the house, the gear-obsessed WIRED Reviews team is writing about our favorite bags and EDCs. Today, reviewer Boutayna Chokrane raves about her love for her Lululemon gym bag. You can also check out other Bag Check stories where WIRED writers share their carryall of choice.
I have long had a soft spot for messenger bags. There’s a retro Silicon Valley vibe to the crossbody that I respect: It implies you move fast, travel light, and keep your world compartmentalized. The unfortunate practical reality of many a messenger bag, though, is chronic neck and shoulder pain. With all of its weight relying on one strap, a single shoulder is left to bear all the burden. After a few blocks adorned with a messenger, you may feel that your style choice has transformed into a full-on punishment. After years of testing various incarnations of messenger bag—including micro slings and cavernous totes—I’d made peace with this trade-off. Beauty is pain, after all.
Then I met the comfort-forward, durable, and compact-yet-cavernous Lululemon 3-in-1 Duffle.
Lululemon
3-in-1 Gym Duffle Bag 30L
True to its name, it’s a multi-use transport system that is easy to reconfigure when my commute demands a different carry. You can grab it by the top handles, sling it across your body when you need your hands, or detach the shoulder strap and wrap it around your yoga mat to use it as a stand-alone mat carrier. No matter how you task it to carry your stuff, rest assured the bag’s design promises utility and comfort: The strap is cushioned enough to spare your shoulder, resilient enough to handle the load of your gym gear, and springy enough to double as a stretching strap. Every component of the duffel has a reason to exist, and some of them even have two.
I’ve been toting this duffel for the gym four days a week since January 2025, which is about as real-world a test as it gets. It has endured Chicago at its most extreme: sleet, wet snow, and torrential rain. The water-repellent nylon shrugs off all elements without any fanfare. The bag dries fast, resists grime, and—most impressively to me—doesn’t hold onto odor. Trust me, I’ve pushed that boundary more than once with sweaty clothes after hot Pilates and have found the included drawstring pouch effectively quarantines everything.
It’s also low-maintenance: After a trip to the beach, a couple of quick shakes cleared out any memory of sand. This duffel requires blessedly minimal upkeep, save for the occasional spot clean, making it a refreshingly low-effort option for commuters who don’t need another chore on their to-do list.
The design is deceptively compact. Externally, it presents as a modest and understated gym bag. But peek inside, and you’ll immediately see that this duffel, with its shocking 30-liter capacity, is Poppins-esque. There’s a dedicated shoe compartment on the side that accommodates up to a men’s size 14, though I prefer to use the bottom section for footwear to keep the main cavity flexible. There’s a slot for a 24-ounce water bottle, interior pockets for keys, AirPods, and other small essentials that tend to disappear into bag voids, and there’s still room for a change of clothes, a Theragun, and a dopp kit. Nothing about this bag feels over-engineered, but nothing feels missing, either.
The Psyche probe, launched in October 2023 on its way to the metallic asteroid it studies, recently performed a flyby of Mars to take advantage of its gravitational pull and continue its trajectory toward the asteroid belt. During the maneuver, the spacecraft obtained new images of the red planet.
Psyche passed within 4,609 kilometers, or 2,864 miles, of the Martian surface, and was boosted to a higher velocity after completing the gravity assist. On the approach, NASA activated onboard cameras, magnetometers, and gamma ray and neutron spectrometers to calibrate each instrument using the planet’s atmosphere and terrain.
In recent images released by the space agency, the rugged Martian surface can be seen in detail, along with traces of the solar wind that, around craters and the south polar cap, is rich in water ice.
“We’ve captured thousands of images of the approach to Mars and of the planet’s surface and atmosphere at close approach. This dataset provides unique and important opportunities for us to calibrate and characterize the performance of the cameras, as well as test the early versions of our image processing tools being developed for use at the asteroid Psyche,” said Jim Bell, Psyche’s imager instrument lead at Arizona State University.
According to the mission scientists, after its flyby of Mars, the probe reached a speed of 1,600 kilometers (or 994 miles) per hour while moving its orbit by one degree. The goal is to reach Psyche in the summer of 2029.
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