Graduate Student Develops an A.I.-Based Approach to Restore Time-Damaged Artwork to Its Former Glory The method could help bring countless old paintings, currently stored in the back rooms of galleries with limited conservation budgets, to light Scans of the painting retouched with a new technique during various stages in the process. On the right is the restored painting with the applied laminate mask. Courtesy of the researchers via MIT In a contest for jobs requiring the most patience, art restoration might take first place. Traditionally, conservators restore paintings by recreating the artwork’s exact colors to fill in the damage, one spot at a time. Even with the help of X-ray imaging and pigment analyses, several parts of the expensive process, such as the cleaning and retouching, are done by hand, as noted by Artnet’s Jo Lawson-Tancred. Now, a mechanical engineering graduate student at MIT has developed an artificial intelligence-based approach that can achieve a faithful restoration in just hours—instead of months of work. In a paper published Wednesday in the journal Nature, Alex Kachkine describes a new method that applies digital restorations to paintings by placing a thin film on top. If the approach becomes widespread, it could make art restoration more accessible and help bring countless damaged paintings, currently stored in the back rooms of galleries with limited conservation budgets, back to light. The new technique “is a restoration process that saves a lot of time and money, while also being reversible, which some people feel is really important to preserving the underlying character of a piece,” Kachkine tells Nature’s Amanda Heidt. Meet the engineer who invented an AI-powered way to restore art Watch on While filling in damaged areas of a painting would seem like a logical solution to many people, direct retouching raises ethical concerns for modern conservators. That’s because an artwork’s damage is part of its history, and retouching might detract from the painter’s original vision. “For example, instead of removing flaking paint and retouching the painting, a conservator might try to fix the loose paint particles to their original places,” writes Hartmut Kutzke, a chemist at the University of Oslo’s Museum of Cultural History, for Nature News and Views. If retouching is absolutely necessary, he adds, it should be reversible. As such, some institutions have started restoring artwork virtually and presenting the restoration next to the untouched, physical version. Many art lovers might argue, however, that a digital restoration printed out or displayed on a screen doesn’t quite compare to seeing the original painting in its full glory. That’s where Kachkine, who is also an art collector and amateur conservator, comes in. The MIT student has developed a way to apply digital restorations onto a damaged painting. In short, the approach involves using pre-existing A.I. tools to create a digital version of what the freshly painted artwork would have looked like. Based on this reconstruction, Kachkine’s new software assembles a map of the retouches, and their exact colors, necessary to fill the gaps present in the painting today. The map is then printed onto two layers of thin, transparent polymer film—one with colored retouches and one with the same pattern in white—that attach to the painting with conventional varnish. This “mask” aligns the retouches with the gaps while leaving the rest of the artwork visible. “In order to fully reproduce color, you need both white and color ink to get the full spectrum,” Kachkine explains in an MIT statement. “If those two layers are misaligned, that’s very easy to see. So, I also developed a few computational tools, based on what we know of human color perception, to determine how small of a region we can practically align and restore.” The method’s magic lies in the fact that the mask is removable, and the digital file provides a record of the modifications for future conservators to study. Kachkine demonstrated the approach on a 15th-century oil painting in dire need of restoration, by a Dutch artist whose name is now unknown. The retouches were generated by matching the surrounding color, replicating similar patterns visible elsewhere in the painting or copying the artist’s style in other paintings, per Nature News and Views. Overall, the painting’s 5,612 damaged regions were filled with 57,314 different colors in 3.5 hours—66 hours faster than traditional methods would have likely taken. Overview of Physically-Applied Digital Restoration Watch on “It followed years of effort to try to get the method working,” Kachkine tells the Guardian’s Ian Sample. “There was a fair bit of relief that finally this method was able to reconstruct and stitch together the surviving parts of the painting.” The new process still poses ethical considerations, such as whether the applied film disrupts the viewing experience or whether A.I.-generated corrections to the painting are accurate. Additionally, Kutzke writes for Nature News and Views that the effect of the varnish on the painting should be studied more deeply. Still, Kachkine says this technique could help address the large number of damaged artworks that live in storage rooms. “This approach grants greatly increased foresight and flexibility to conservators,” per the study, “enabling the restoration of countless damaged paintings deemed unworthy of high conservation budgets.” Get the latest stories in your inbox every weekday.

Study the Secrets of Early American Photography at This New Exhibition “The New Art: American Photography, 1839-1910” at the Metropolitan Museum of Art will feature more than 250 photographs Lillian Ali - Staff Contributor June 6, 2025 This image, taken by an unknown photographer in 1905, is an example of a cyanotype. The Metropolitan Museum of Art, William L. Schaeffer Collection A new exhibition at the crossroads of art, history and technology chronicles the beginnings of early American photography. Titled “The New Art: American Photography, 1839-1910,” the show at the Metropolitan Museum of Art in New York City features more than 250 photographs that capture “the complexities of a nation in the midst of profound transformation,” says Max Hollein, the Met’s CEO, in a statement. Curator Jeff Rosenheim tells the Wall Street Journal’s William Meyers that the exhibition focuses “on how early artists used the different formats to record individuals and the built and natural environments surrounding them.” A daguerrotype from around 1850 depicts a woman wearing a tignon, a headcovering popular among Creole women of African descent. The Metropolitan Museum of Art, William L. Schaeffer Collection The oldest photographs on display are daguerreotypes, named for inventor Louis Daguerre, which were introduced in 1839 as the first publicly available form of photography. Creating a daguerreotype was a delicate, sometimes painstaking process that involved several chemical treatments and variable exposure times. The process yielded a sharply detailed picture on a silver background and was usually used for studio portraiture. The exhibition moves through the history of photography, from daguerreotypes and other photographs made on metal to those made on glass and, eventually, paper. It even features stereographs, two photos showing an object from slightly different points of view, creating an illusion of three-dimensionality. Installation view of "The New Art: American Photography, 1839-1910" Eugenia Tinsely / The Met Rosenheim believes that early photographic portraits empowered working-class Americans. “Photographic portraits play a role in people feeling like they could be a citizen,” Rosenheim tells the Guardian’s Veronica Esposito. “It’s a psychological, empowering thing to own your own likeness.” Photographs in the exhibition also spotlight key moments in American history. Items on view include a portrait of formerly enslaved individuals and an image of a conspirator in the assassination of Abraham Lincoln. The exhibition features big names in American photography, such as John Moran, who advocated for the recognition of photography as an art form, and Alice Austen, a pioneering landscape photographer. Group on Petria, Lake Mahopac​​​​​​, photographed in 1888 by Alice Austen The Metropolitan Museum of Art, William L. Schaeffer Collection Many of the photographs on display were taken by unknown artists. One of the most recent photos in the exhibition, taken by an unknown artist in 1905, is a cyanotype depicting figures tobogganing on a hill in Massachusetts. Cyanotypes were created by exposing a chemically treated paper to UV light, such as sunlight, yielding the blue pigment it was named for. Beyond portraits and landscapes, the exhibition features several enigmatic images, such as one of a boot placed in a roller skate and positioned on top of a stool. Rosenheim tells the Guardian that the mysterious photo “asks more questions than it answers.” An unknown photographer took this unconventional still life in the 1860s. The Metropolitan Museum of Art, William L. Schaeffer Collection “It’s very emblematic of the whole of 19th-century American photography,” he adds. The exhibition features photographs from across time and economic divides, with portraits of the working-class and wealthy alike. “The collection is just filled with the everyday stories of people,” Rosenheim tells the Guardian. “I don’t think painting can touch that.” “The New Art: American Photography, 1839-1910” is on view at the Metropolitan Museum of Art in New York City through July 20, 2025. Get the latest stories in your inbox every weekday.

With reclaimed land previously allocated to cars, the Grijalva River boardwalk offers generous public spaces and reconnects the Mexican city of Villahermosa to its river In Villahermosa, nature reigns supreme. Surrounded by rivers, lagoons, wild vegetation and the scorching heat of a humid tropical climate, the city’s identity is shaped by intense and unpredictable natural forces. The capital of the Mexican state of Tabasco was founded in 1564 on the banks of the Grijalva River, a vital trade route that has significantly shaped the city’s development. For locals, the river has long been both blessing and threat; major floods have been recorded since the 17th century. A devastating flood in 2007 submerged what officials estimated to be 80 per cent of the city, damaging or destroying more than 120,000 homes. In the aftermath of the inundation, high concrete retaining walls were built along both banks of the Grijalva River to prevent further flooding. While this was an understandable measure at first glance, it consequently caused residents to lose both their visual and physical connection with the river. As a result, people moved, particularly from the western bank where the historical centre is located, to new areas further away from the Grijalva River. The riverfront was left to deteriorate into a troubled zone. On the eastern bank, the neighbourhood of Gaviotas was already considered unsafe before the flood, yet it maintained more of its residential character. In 2022, 15 years after the dramatic flood, then‑president Andrés Manuel López Obrador, more commonly known as AMLO, announced the construction of a new 6km‑long riverfront promenade in Villahermosa, the capital of his home state. The idea was to enable the population to once again take pride in and live with their river, looking to Paris and Rome as examples. The monumental task, with its large urban scale and the population’s psychological trauma, was entrusted to the Ministry of Agricultural, Territorial and Urban Development (SEDATU) as part of their Programa de Mejoramiento Urbano (Urban Improvement Programme, or PMU). This programme aimed to use architecture as an ‘instrument of social transformation’. High expectations were placed on these projects; architects were asked to create ‘places of national pride’ while improving everyday living conditions. The architectural trio of Alejandro Castro Jiménez Labora, Mauricio Rocha Iturbide, and Óscar Rodríguez Castañeda, along with their teams, were commissioned to design a linear park along both banks of the Grijalva. Each architect contributed their strength: Castro brought his expertise in poetic urban furniture; Rocha his sensitive and atmospheric architectural approach; and Rodríguez his thoughtful urban and traffic planning skills. The SEDATU team provided technical and participatory expertise, enabling contextual sensitivity by sharing essential information about the site’s topography, soil conditions and water flows. From the city’s existing observatory, the Torre del Caballero landmark, visitors enjoy an excellent view over the redesigned riverbanks. The historical centre and the Gaviotas neighbourhood now form a single ensemble, while the intervention carefully responds to the different conditions found along the length of the river. The project’s main objective is to reclaim some of the land previously allocated to cars and create a promenade for pedestrians and slower vehicles, punctuated with public spaces and facilities. On both sides of the river, cars are now limited to just one or two grey asphalt lanes. Running alongside are generous cycle paths and pedestrian walkways made of earth‑coloured concrete. Speed bumps in the same material and colour connect the pavements on either side of the road while helping to limit traffic speed to 30km/h, further enhancing pedestrian safety. Several design elements are found along almost the entire promenade. A ribbon of light‑grey benches delineates the edge of the elevated riverfront; stone walls, steps and ramps are used to negotiate the slight changes in level; planters and lush vegetation soften the transition to the walkways, creating a welcome buffer from street traffic. The most visually striking components are the tall, red‑pigmented concrete light poles on the elevated path, adorned with elegant L‑shaped steel light fixtures, which establish a strong and cohesive visual rhythm. Only upon closer inspection you notice the 2007 retaining walls peeking through the dense tropical vegetation. Removing these unattractive concrete barriers was never an option; they stand as a symbol of successful flood protection for the local population. The architectural team ingeniously built the elevated promenade atop the existing wall – an effective concealment from the street side while simultaneously inviting residents to reconnect with the Grijalva.  At the foot of the observatory, directly below the retaining wall, the earth‑toned concrete platforms of the Carlos A Madrazo Becerra Park stretch towards the river. Visitors can access the park via a ramp from the promenade on the western bank or by ferry from the opposite side. In the park, concrete furnishings invite visitors to linger among tropical vegetation set against tall natural stone walls. Importantly, it is a space that is durable and requires minimal maintenance – a survival formula for public parks in the Mexican context. Small traces on the concrete benches reveal that the park weathered its baptism of fire last year: the design accommodates the river’s natural dynamics, adapting to fluctuating water levels without compromising public safety. Beyond providing much‑needed shade, the extensive planting of native, low‑maintenance plants on both riverbanks has improved soil stability. Above the park, on a broad extension of the elevated pathway, stand three long, elegant buildings with large cantilevered roofs supported by hefty beams resting on distinctive double columns. The tall glass walls that enclose the interiors are set back, creating a visual flow between interior and exterior spaces. While the beams evoke timber construction, they – like the columns – are made of the same pigmented concrete used for the promenade paving. Despite their refined composition, these structures have remained largely unused since their completion over a year ago, neither serving their intended function as restaurants nor hosting alternative uses. Even the beautifully designed park sees only limited public engagement. The ambitious goal of SEDATU with the PMU projects to ‘counteract violence and strengthen the social fabric’ appears, for now, to have fallen short in this area. According to national statistics, Villahermosa ranks first in perceived insecurity among Mexican cities. This sense of insecurity is tangible on the promenade by the city centre, where buildings that look abandoned contribute to an atmosphere of neglect. The situation is markedly different on the opposite riverbank, in the Gaviotas neighbourhood. Construction of the 3.5km promenade on this side began in 2021 with three open pavilions housing several small kiosks, which quickly evolved into popular taco stands. The Plaza Solidaridad, revitalised by the architectural trio, draws people from the surrounding vibrant neighbourhood. Further south, the final section that was built is a large sports area and children’s playground, which were embraced by the local community even before their official inauguration in February 2024. Especially after sunset, when the air cools, the well‑lit Gaviotas riverfront comes to life. During daylight hours, however, air‑conditioned shopping centres remain the preferred gathering places for the residents of Villahermosa. Rocha describes the city’s new promenade as a ‘jazz composition’, a striking metaphor that speaks of rhythmic complexity and the freedom to improvise. With just a few designed elements and carefully selected colours, the architects have harmoniously layered the river’s urban spaces. The project is earning international recognition but, in Mexico, it faced sharp criticism and was overshadowed by accusations of nepotism. Castro is a friend of AMLO’s son, and the fact that the intervention took place in the home state of the then‑president, coupled with its substantial budget by local standards, drew considerable attention. According to residents, this undermined public acceptance. When asked about the negative press, Rocha speaks of the need to develop a ‘crisis muscle’; he says architects working on public projects in Mexico must ‘let go of perfectionism’ as much lies beyond their control.  During AMLO’s six‑year term, which ended in 2024, SEDATU implemented 1,300 PMU projects in 193 highly marginalised municipalities across the country. While many of these interventions undoubtedly improved people’s quality of life, the Villahermosa riverside project also reveals architecture’s limitations, exposing some of the programme’s weaknesses: architectural interventions often act as sticking plasters on an extensively damaged urban fabric. They are handed over from a national ministry with comprehensive expertise and funding to local governments lacking the means to sustain them. Although SEDATU conducted participatory consultations during the project’s implementation, this engagement was absent once the project was completed. Public acceptance and appropriation can take time; what this project does is send an invitation out. 2025-06-05 Reuben J Brown Share AR June 2025RoadsBuy Now

Researchers from the Department of Mechanical Engineering at Virginia Tech have introduced a continuous fiber reinforcement (CFR) deposition tool designed for multi-axis 3D printing, significantly enhancing mechanical performance in composite structures. Led by Kieran D. Beaumont, Joseph R. Kubalak, and Christopher B. Williams, and published in Springer Nature Link, the study demonstrates an 820% improvement in maximum load capacity compared to conventional planar short carbon fiber (SCF) 3D printing methods. This tool integrates three key functions: reliable fiber cutting and re-feeding, in situ fiber volume fraction control, and a slender collision volume to support complex multi-axis toolpaths. The newly developed deposition tool addresses critical challenges in CFR additive manufacturing. It is capable of cutting and re-feeding continuous fibers during travel movements, a function required to create complex geometries without material tearing or print failure. In situ control of fiber volume fraction is also achieved by adjusting the polymer extrusion rate. A slender geometry minimizes collisions between the tool and the printed part during multi-axis movements. The researchers designed the tool to co-extrude a thermoplastic polymer matrix with a continuous carbon fiber (CCF) towpreg. This approach allowed reliable fiber re-feeding after each cut and enabled printing with variable fiber content within a single part. The tool’s slender collision volume supports increased range of motion for the robotic arm used in the experiments, allowing alignment of fibers with three-dimensional load paths in complex structures. The six Degree-of-Freedom Robotic Arm printing a multi-axis geometry from a CFR polymer composite. Photo via Springer Nature Link. Mechanical Testing Confirms Load-Bearing Improvements Mechanical tests evaluated the impact of continuous fiber reinforcement on polylactic acid (PLA) parts. In tensile tests, samples reinforced with continuous carbon fibers achieved a tensile strength of 190.76 MPa and a tensile modulus of 9.98 GPa in the fiber direction. These values compare to 60.31 MPa and 3.01 GPa for neat PLA, and 56.92 MPa and 4.30 GPa for parts containing short carbon fibers. Additional tests assessed intra-layer and inter-layer performance, revealing that the continuous fiber–reinforced material had reduced mechanical properties in these orientations. Compared to neat PLA, intra-layer tensile strength and modulus dropped by 66% and 63%, respectively, and inter-layer strength and modulus decreased by 86% and 60%. Researchers printed curved tensile bar geometries using three methods to evaluate performance in parts with three-dimensional load paths: planar short carbon fiber–reinforced PLA, multi-axis short fiber–reinforced samples, and multi-axis continuous fiber–reinforced composites. The multi-axis short fiber–reinforced parts showed a 41.6% increase in maximum load compared to their planar counterparts. Meanwhile, multi-axis continuous fiber–reinforced parts absorbed loads 8.2 times higher than the planar short fiber–reinforced specimens. Scanning electron microscopy (SEM) images of fracture surfaces revealed fiber pull-out and limited fiber-matrix bonding, particularly in samples with continuous fibers. Schematic illustration of common continuous fiber reinforcement–material extrusion (CFR-MEX) modalities: in situ impregnation, towpreg extrusion, and co-extrusion with towpreg. Photo via Springer Nature Link. To verify the tool’s fiber cutting and re-feeding capability, the researchers printed a 100 × 150 × 3 mm rectangular plaque that required 426 cutting and re-feeding operations across six layers. The deposition tool achieved a 100% success rate, demonstrating reliable cutting and re-feeding without fiber clogging. This reliability is critical for manufacturing complex structures that require frequent travel movements between deposition paths. In situ fiber volume fraction control was validated through printing a rectangular prism sample with varying polymer feed rates, road widths, and layer heights. The fiber volume fractions achieved in different sections of the part were 6.51%, 8.00%, and 9.86%, as measured by cross-sectional microscopy and image analysis. Although lower than some literature reports, the researchers attributed this to the specific combination of tool geometry, polymer-fiber interaction time, and print speed. The tool uses Anisoprint’s CCF towpreg, a pre-impregnated continuous carbon fiber product with a fiber volume fraction of 57% and a diameter of 0.35 mm. 3DXTECH’s black PLA and SCF-PLA filaments were selected to ensure consistent matrix properties and avoid the influence of pigment variations on mechanical testing. The experiments were conducted using an ABB IRB 4600–40/2.55 robotic arm equipped with a tool changer for switching between the CFR-MEX deposition tool and a standard MEX tool with an elongated nozzle for planar prints. Deposition Tool CAD and Assembly. Photo via Springer Nature Link. Context Within Existing Research and Future Directions Continuous fiber reinforcement in additive manufacturing has previously demonstrated significant improvements in part performance, with some studies reporting tensile strengths of up to 650 MPa for PLA composites reinforced with continuous carbon fibers. However, traditional three-axis printing methods restrict fiber orientation to planar directions, limiting these gains to within the XY-plane. Multi-axis 3D printing approaches have demonstrated improved load-bearing capacity in short-fiber reinforced parts. For example, multi-axis printed samples have shown failure loads several times higher than planar-printed counterparts in pressure cap and curved geometry applications. Virginia Tech’s tool integrates multiple functionalities that previous tools in literature could not achieve simultaneously. It combines a polymer feeder based on a dual drive extruder, a fiber cutter and re-feeder assembly, and a co-extrusion hotend with adjustable interaction time for fiber-polymer bonding. A needle-like geometry and external pneumatic cooling pipes reduce the risk of collision with the printed part during multi-axis reorientation. Measured collision volume angles were 56.2° for the full tool and 41.6° for the hotend assembly. Load-extension performance graphs for curved tensile bars. Photo via Springer Nature Link. Despite these advances, the researchers identified challenges related to weak bonding between the fiber and the polymer matrix. SEM images showed limited impregnation of the polymer into the fiber towpreg, with the fiber-matrix interface remaining a key area for future work. The study highlights that optimizing fiber tow sizing and improving the fiber-polymer interaction time during printing could enhance inter-layer and intra-layer performance. The results also suggest that advanced toolpath planning algorithms could further leverage the tool’s ability to align fiber deposition along three-dimensional load paths, improving mechanical performance in functional parts. The publication in Springer Nature Link documents the full design, validation experiments, and mechanical characterization of the CFR-MEX tool. The work adds to a growing body of research on multi-axis additive manufacturing, particularly in combining continuous fiber reinforcement with complex geometries. Take the 3DPI Reader Survey — shape the future of AM reporting in under 5 minutes. Ready to discover who won the 20243D Printing Industry Awards? Subscribe to the 3D Printing Industry newsletter to stay updated with the latest news and insights. Featured photo shows the six Degree-of-Freedom Robotic Arm printing a multi-axis geometry. Photo via Springer Nature Link. Anyer Tenorio Lara Anyer Tenorio Lara is an emerging tech journalist passionate about uncovering the latest advances in technology and innovation. With a sharp eye for detail and a talent for storytelling, Anyer has quickly made a name for himself in the tech community. Anyer's articles aim to make complex subjects accessible and engaging for a broad audience. In addition to his writing, Anyer enjoys participating in industry events and discussions, eager to learn and share knowledge in the dynamic world of technology.

Best of the rest Research roundup: 7 stories we almost missed Also: drumming chimpanzees, picking styles of two jazz greats, and an ancient underground city's soundscape Jennifer Ouellette – May 31, 2025 5:37 pm | 4 Time lapse photos show a new ping-pong-playing robot performing a top spin. Credit: David Nguyen, Kendrick Cancio and Sangbae Kim Time lapse photos show a new ping-pong-playing robot performing a top spin. Credit: David Nguyen, Kendrick Cancio and Sangbae Kim Story text Size Small Standard Large Width * Standard Wide Links Standard Orange * Subscribers only   Learn more It's a regrettable reality that there is never time to cover all the interesting scientific stories we come across each month. In the past, we've featured year-end roundups of cool science stories we (almost) missed. This year, we're experimenting with a monthly collection. May's list includes a nifty experiment to make a predicted effect of special relativity visible; a ping-pong playing robot that can return hits with 88 percent accuracy; and the discovery of the rare genetic mutation that makes orange cats orange, among other highlights. Special relativity made visible Credit: TU Wien Perhaps the most well-known feature of Albert Einstein's special theory of relativity is time dilation and length contraction. In 1959, two physicists predicted another feature of relativistic motion: an object moving near the speed of light should also appear to be rotated. It's not been possible to demonstrate this experimentally, however—until now. Physicists at the Vienna University of Technology figured out how to reproduce this rotational effect in the lab using laser pulses and precision cameras, according to a paper published in the journal Communications Physics. They found their inspiration in art, specifically an earlier collaboration with an artist named Enar de Dios Rodriguez, who collaborated with VUT and the University of Vienna on a project involving ultra-fast photography and slow light. For this latest research, they used objects shaped like a cube and a sphere and moved them around the lab while zapping them with ultrashort laser pulses, recording the flashes with a high-speed camera. Getting the timing just right effectively yields similar results to a light speed of 2 m/s. After photographing the objects many times using this method, the team then combined the still images into a single image. The results: the cube looked twisted and the sphere's North Pole was in a different location—a demonstration of the rotational effect predicted back in 1959. DOI: Communications Physics, 2025. 10.1038/s42005-025-02003-6  (About DOIs). Drumming chimpanzees A chimpanzee feeling the rhythm. Credit: Current Biology/Eleuteri et al., 2025. Chimpanzees are known to "drum" on the roots of trees as a means of communication, often combining that action with what are known as "pant-hoot" vocalizations (see above video). Scientists have found that the chimps' drumming exhibits key elements of musical rhythm much like humans, according to  a paper published in the journal Current Biology—specifically non-random timing and isochrony. And chimps from different geographical regions have different drumming rhythms. Back in 2022, the same team observed that individual chimps had unique styles of "buttress drumming," which served as a kind of communication, letting others in the same group know their identity, location, and activity. This time around they wanted to know if this was also true of chimps living in different groups and whether their drumming was rhythmic in nature. So they collected video footage of the drumming behavior among 11 chimpanzee communities across six populations in East Africa (Uganda) and West Africa (Ivory Coast), amounting to 371 drumming bouts. Their analysis of the drum patterns confirmed their hypothesis. The western chimps drummed in regularly spaced hits, used faster tempos, and started drumming earlier during their pant-hoot vocalizations. Eastern chimps would alternate between shorter and longer spaced hits. Since this kind of rhythmic percussion is one of the earliest evolved forms of human musical expression and is ubiquitous across cultures, findings such as this could shed light on how our love of rhythm evolved. DOI: Current Biology, 2025. 10.1016/j.cub.2025.04.019  (About DOIs). Distinctive styles of two jazz greats Jazz lovers likely need no introduction to Joe Pass and Wes Montgomery, 20th century guitarists who influenced generations of jazz musicians with their innovative techniques. Montgomery, for instance, didn't use a pick, preferring to pluck the strings with his thumb—a method he developed because he practiced at night after working all day as a machinist and didn't want to wake his children or neighbors. Pass developed his own range of picking techniques, including fingerpicking, hybrid picking, and "flat picking." Chirag Gokani and Preston Wilson, both with Applied Research Laboratories and the University of Texas, Austin, greatly admired both Pass and Montgomery and decided to explore the underlying the acoustics of their distinctive playing, modeling the interactions of the thumb, fingers, and pick with a guitar string. They described their research during a meeting of the Acoustical Society of America in New Orleans, LA. Among their findings: Montgomery achieved his warm tone by playing closer to the bridge and mostly plucking at the string. Pass's rich tone arose from a combination of using a pick and playing closer to the guitar neck. There were also differences in how much a thumb, finger, and pick slip off the string:  use of the thumb (Montgomery) produced more of a "pluck" compared to the pick (Pass), which produced more of a "strike." Gokani and Wilson think their model could be used to synthesize digital guitars with a more realistic sound, as well as helping guitarists better emulate Pass and Montgomery. Sounds of an ancient underground city Credit: Sezin Nas Turkey is home to the underground city Derinkuyu, originally carved out inside soft volcanic rock around the 8th century BCE. It was later expanded to include four main ventilation channels (and some 50,000 smaller shafts) serving seven levels, which could be closed off from the inside with a large rolling stone. The city could hold up to 20,000 people and it  was connected to another underground city, Kaymakli, via tunnels. Derinkuyu helped protect Arab Muslims during the Arab-Byzantine wars, served as a refuge from the Ottomans in the 14th century, and as a haven for Armenians escaping persecution in the early 20th century, among other functions. The tunnels were rediscovered in the 1960s and about half of the city has been open to visitors since 2016. The site is naturally of great archaeological interest, but there has been little to no research on the acoustics of the site, particularly the ventilation channels—one of Derinkuyu's most unique features, according to Sezin Nas, an architectural acoustician at Istanbul Galata University in Turkey.  She gave a talk at a meeting of the Acoustical Society of America in New Orleans, LA, about her work on the site's acoustic environment. Nas analyzed a church, a living area, and a kitchen, measuring sound sources and reverberation patterns, among other factors, to create a 3D virtual soundscape. The hope is that a better understanding of this aspect of Derinkuyu could improve the design of future underground urban spaces—as well as one day using her virtual soundscape to enable visitors to experience the sounds of the city themselves. MIT's latest ping-pong robot Robots playing ping-pong have been a thing since the 1980s, of particular interest to scientists because it requires the robot to combine the slow, precise ability to grasp and pick up objects with dynamic, adaptable locomotion. Such robots need high-speed machine vision, fast motors and actuators, precise control, and the ability to make accurate predictions in real time, not to mention being able to develop a game strategy. More recent designs use AI techniques to allow the robots to "learn" from prior data to improve their performance. MIT researchers have built their own version of a ping-pong playing robot, incorporating a lightweight design and the ability to precisely return shots. They built on prior work developing the Humanoid, a small bipedal two-armed robot—specifically, modifying the Humanoid's arm by adding an extra degree of freedom to the wrist so the robot could control a ping-pong paddle. They tested their robot by mounting it on a ping-pong table and lobbing 150 balls at it from the other side of the table, capturing the action with high-speed cameras. The new bot can execute three different swing types (loop, drive, and chip) and during the trial runs it returned the ball with impressive accuracy across all three types: 88.4 percent, 89.2 percent, and 87.5 percent, respectively. Subsequent tweaks to theirrystem brought the robot's strike speed up to 19 meters per second (about 42 MPH), close to the 12 to 25 meters per second of advanced human players. The addition of control algorithms gave the robot the ability to aim. The robot still has limited mobility and reach because it has to be fixed to the ping-pong table but the MIT researchers plan to rig it to a gantry or wheeled platform in the future to address that shortcoming. Why orange cats are orange Credit: Astropulse/CC BY-SA 3.0 Cat lovers know orange cats are special for more than their unique coloring, but that's the quality that has intrigued scientists for almost a century. Sure, lots of animals have orange, ginger, or yellow hues, like tigers, orangutans, and golden retrievers. But in domestic cats that color is specifically linked to sex. Almost all orange cats are male. Scientists have now identified the genetic mutation responsible and it appears to be unique to cats, according to a paper published in the journal Current Biology. Prior work had narrowed down the region on the X chromosome most likely to contain the relevant mutation. The scientists knew that females usually have just one copy of the mutation and in that case have tortoiseshell (partially orange) coloring, although in rare cases, a female cat will be orange if both X chromosomes have the mutation. Over the last five to ten years, there has been an explosion in genome resources (including complete sequenced genomes) for cats which greatly aided the team's research, along with taking additional DNA samples from cats at spay and neuter clinics. From an initial pool of 51 candidate variants, the scientists narrowed it down to three genes, only one of which was likely to play any role in gene regulation: Arhgap36. It wasn't known to play any role in pigment cells in humans, mice, or non-orange cats. But orange cats are special; their mutation (sex-linked orange) turns on Arhgap36 expression in pigment cells (and only pigment cells), thereby interfering with the molecular pathway that controls coat color in other orange-shaded mammals. The scientists suggest that this is an example of how genes can acquire new functions, thereby enabling species to better adapt and evolve. DOI: Current Biology, 2025. 10.1016/j.cub.2025.03.075  (About DOIs). Not a Roman "massacre" after all Credit: Martin Smith In 1936, archaeologists excavating the Iron Age hill fort Maiden Castle in the UK unearthed dozens of human skeletons, all showing signs of lethal injuries to the head and upper body—likely inflicted with weaponry. At the time, this was interpreted as evidence of a pitched battle between the Britons of the local Durotriges tribe and invading Romans. The Romans slaughtered the native inhabitants, thereby bringing a sudden violent end to the Iron Age. At least that's the popular narrative that has prevailed ever since in countless popular articles, books, and documentaries. But a paper published in the Oxford Journal of Archaeology calls that narrative into question. Archaeologists at Bournemouth University have re-analyzed those burials, incorporating radiocarbon dating into their efforts. They concluded that those individuals didn't die in a single brutal battle. Rather, it was Britons killing other Britons over multiple generations between the first century BCE and the first century CE—most likely in periodic localized outbursts of violence in the lead-up to the Roman conquest of Britain. It's possible there are still many human remains waiting to be discovered at the site, which could shed further light on what happened at Maiden Castle. DOI: Oxford Journal of Archaeology, 2025. 10.1111/ojoa.12324  (About DOIs). Jennifer Ouellette Senior Writer Jennifer Ouellette Senior Writer Jennifer is a senior writer at Ars Technica with a particular focus on where science meets culture, covering everything from physics and related interdisciplinary topics to her favorite films and TV series. Jennifer lives in Baltimore with her spouse, physicist Sean M. Carroll, and their two cats, Ariel and Caliban. 4 Comments

By Ellyn Lapointe Published May 31, 2025 | Comments (0) | Researchers recovered this face-shaped rock from the San Lázaro rock-shelter in central Spain in 2022 © Álvarez-Alonso et al While digging inside a cave in the Spanish city of Segovia, archaeologists uncovered an unusual rock. The hand-sized stone naturally resembled an elongated face, and featured a spot of red pigment made from ochre right on the tip of what may be considered its nose.  “We were all thinking the same thing and looking at each other because of its shape: we were all thinking, ‘This looks like a face,’” David Álvarez Alonso, an archaeologist at Complutense University in Madrid who was part of the dig, told The Guardian. Álvarez Alonso and his colleagues spent the next three years studying this bizarre rock. The researchers posit that 43,000 years ago, a Neanderthal dipped their finger in ochre and pressed it onto the stone’s central ridge—leaving behind what is now considered to be the world’s oldest complete human fingerprint. It’s an intriguing finding that could have significant implications, but some experts would like to see more evidence to support this hypothesis.  The team published its findings in the journal Archaeological and Anthropological Sciences on Saturday, May 24. In the paper, the archaeologists state that the “strategic position” of the dot suggests it is evidence of Neanderthals’ “symbolic behavior.” In other words, it’s a piece of art that “could represent one of the earliest human face symbolizations in prehistory.” “The fact that the [rock] was selected because of its appearance and then marked with ochre shows that there was a human mind capable of symbolizing, imagining, idealizing and projecting his or her thoughts on an object,” the researchers write.  Whether Neanderthals were capable of making art is a subject of ongoing debate, co-author María de Andrés-Herrero, a professor of prehistory at Complutense University, told the BBC. But over the past decade, a growing body of evidence has led many experts to believe that artistic expression emerged earlier in human evolution than previously thought.  The authors of this new study think their stone adds to this evidence. To reach this conclusion, they first needed more data to support the idea that this ancient artist had actually experienced pareidolia: seeing a face in an inanimate object. To that end, they generated a 3D model of the stone’s surface and measured the distances between its features, finding that the red dot—or nose—was placed such that it accurately resembled an actual nose on a human face.  Then, the researchers enlisted the help of geologists to characterize the red dot, confirming that it was made with ochre. Forensic police experts then used multispectral analysis—a technique that can reveal details invisible to the naked eye—to confirm that the red dot had been applied with a fingertip. Their analysis uncovered a fingerprint that could have belonged to an adult male Neanderthal inside the dot.  “Once we had that and all the other pieces, context and information, we advanced the theory that this could be a pareidolia, which then led to a human intervention in the form of the red dot,” Álvarez Alonso told The Guardian. “Without that red dot, you can’t make any claims about the object.” But Gilliane Monnier, a professor of anthropology at the University of Minnesota who studies Neanderthal behavior, is not totally convinced by the researchers’ findings. “The fact that there are these natural depressions—and that we can measure the distance between them and argue that it’s a face—that’s all well and good,” Monnier, who wasn’t involved in the study, told Gizmodo. “But that doesn’t give us any indication that the Neanderthals who [occupied this cave] saw a face in that [rock].”  What’s more, she is skeptical of the researchers’ claim that the red dot was actually made with a human fingertip. It’s possible, she said, that the coloring and fingerprint-like ridges formed naturally. “I would be interested in seeing an explanation by a geologist—someone trained in geology—saying the likelihood of this forming by natural, geological or geomicrobial processes is a very low likelihood,” Monnier said.  The researchers, too, acknowledge that “it is unlikely that all doubts surrounding this hypothesis can be fully dispelled,” and state that the pareidolia hypothesis should not be seen as a definitive claim, but rather a possible explanation for this object based on the evidence. So it’s hard to say whether this study clarifies or complicates our understanding of how the human mind evolved the ability to create art. The face-shaped rock is an intriguing piece of the puzzle, but more research is needed to figure out where it fits. Daily Newsletter You May Also Like By Margherita Bassi Published May 28, 2025 By Margherita Bassi Published May 27, 2025 By Margherita Bassi Published May 25, 2025 By Natalia Mesa Published May 13, 2025 By Margherita Bassi Published May 8, 2025 By Margherita Bassi Published April 23, 2025

Villa Air / ARK-architectureSave this picture!© Bilel KhemakhemHouses•Tunis, Tunisia Architects: ARK-architecture Area Area of this architecture project Area:  1500 m² Year Completion year of this architecture project Year:  2024 Photographs Photographs:Bilel Khemakhem Manufacturers Brands with products used in this architecture project Manufacturers:  Trespa, Elements, QUICK-STEP, REVIGLASS, Saint Gobain Glass, Schüco, TOSHIBAMore SpecsLess Specs Save this picture! Text description provided by the architects. Villa Air is a distilled expression of contemporary architecture rooted in the Tunisian landscape. Set within a two-hectare plot in Morneg, this 1,500 m² residence unfolds as a meditative dialogue between built form and topography. The site, defined by its gentle slope and sweeping views, culminates in the striking silhouette of the Jbal Errsas mountain range—a natural horizon that anchors the architectural narrative. From the outset, the project embraces a central duality: the tension between gravitas and lightness, between groundedness and suspension. This dialectic, subtly embedded in the villa's name, structures the entire composition. Distributed across three levels, the house is articulated as a series of horizontal strata punctuated by bold cantilevers. These projections—remarkably slender at just 45 cm thick—embody both structural daring and environmental responsiveness, casting precise shadow lines that temper the Mediterranean sun.Save this picture!Save this picture!Save this picture!Rather than asserting dominance over the terrain, the architecture yields to it. The villa engages the land with measured restraint, allowing the natural contours to guide its form. A textured finish in earthy tones fosters chromatic continuity with the ground, while the massing cascades along the slope, suggesting a geological emergence rather than an architectural imposition. The principal façade distills the project's ethos: a calibrated composition of apertures that frames the landscape as a sequence of living tableaux. Each elevation is attuned to its orientation, choreographing a spatial experience that is both immersive and contemplative. Here, architecture acts not as a boundary, but as a lens.Save this picture!Materiality is approached with deliberate restraint. Pristine white volumes capture the shifting Mediterranean light, animating surfaces in a daily choreography of shadows. Travertine and timber introduce tactile warmth, while concrete elements — subtly tinted with sand pigments — ground the building in its context and enhance its material belonging. Internally, the spatial organization privileges continuity and flow. Circulations are not mere connectors, but choreographed transitions. Double-height volumes channel daylight deep into the core, while vertical pathways become elevated promenades offering ever-evolving perspectives of the surrounding landscape.Save this picture!Save this picture!Save this picture!The architecture explores a central paradox: the reconciliation of intimacy with openness, of enclosure with exposure. This tension is resolved through a refined gradation of thresholds, where interiors dissolve into terraces and open platforms, softening the boundaries between inside and out. Twin infinity pools extend the architectural geometry toward the horizon, amplifying the sensation of lightness and spatial suspension. Water and sky converge in a silent dialogue, completing the project's aspiration to exist not merely in the landscape but in symbiosis with it. Villa Air stands as a testament to a site-specific Mediterranean modernism — one that privileges clarity, precision, and sensory depth. More than a functional residence, it evokes a poetic condition of dwelling: a place where form, matter, and perception converge in quiet resonance.Save this picture! Project gallerySee allShow less About this officeARK-architectureOffice••• MaterialConcreteMaterials and TagsPublished on May 30, 2025Cite: "Villa Air / ARK-architecture" 30 May 2025. ArchDaily. Accessed . <https://www.archdaily.com/1030593/villa-air-ark-architecture&gt ISSN 0719-8884Save世界上最受欢迎的建筑网站现已推出你的母语版本!想浏览ArchDaily中国吗?是否 You've started following your first account!Did you know?You'll now receive updates based on what you follow! Personalize your stream and start following your favorite authors, offices and users.Go to my stream