Arid coastal regions that are also prone to fog are prime locations for fog-harvesting devices as a water source, especially during prolonged droughts. But the standard technology is prone to clogging. Scientists at Virginia Tech have created an improved version of their earlier "fog harp" alternative design to address that issue, according to a new paper published in the Journal of Materials Chemistry A.

Fog harvesting (or dew catching) is an ancient practice dating as far back as the Incas, who placed buckets under trees to collect condensation. It's also practiced by certain insects, notably Namib desert beetles, which survive on the water that condenses onto their wings. The wings have alternating hydrophilic and hydrophobic regions to enhance the condensation. Today's fog harvesters are usually mesh nets mounted onto frames with a trough or basin underneath. Like the beetle's wings, the mesh filaments are chemically coated to be either hydrophobic or hydrophilic.

The efficiency of these water harvesters depends on decreasing the size of the filaments and the mesh holes. "If the holes were too big, the microscopic droplets would pass through it, and it wouldn't harvest much water," co-author James Kaindu, a student in researcher Jonathan Boreyko's lab at Virginia Tech, told Ars. The trade-off is that smaller filaments and holes are more prone to clogging. "If it was too small, the droplets would coalesce and create a water film on it," said Kaindu. "It would impede the flow and act as a barrier that would dramatically affect its capture efficiency."

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Apart from a short teaser in April, we haven't seen much of Star Trek: Strange New Worlds' upcoming third season, debuting next month. But Paramount+ has finally released the official trailer.

(Spoilers for S2 below.)

As previously reported, the S2 finale found the Enterprise under vicious attack by the Gorn, who were in the midst of invading one of the Federation's colony worlds. Several crew members were kidnapped, along with other survivors of the attack. Captain Pike (Anson Mount) faced a momentous decision: follow orders to retreat or disobey them to rescue his crew. Footage shown last October at New York City Comic-Con picked up where the finale left off, giving us the kind of harrowing high-stakes pitched space battle against a ferocious enemy that has long been a hallmark of the franchise. (Of course, Pike opted to rescue his crew.)

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In 2019, we told you about a new interactive digital "murder map" of London compiled by University of Cambridge criminologist Manuel Eisner. Drawing on data catalogued in the city coroners' rolls, the map showed the approximate location of 142 homicide cases in late medieval London. The Medieval Murder Maps project has since expanded to include maps of York and Oxford homicides, as well as podcast episodes focusing on individual cases.

It's easy to lose oneself down the rabbit hole of medieval murder for hours, filtering the killings by year, choice of weapon, and location. Think of it as a kind of 14th-century version of Clue: It was the noblewoman's hired assassins armed with daggers in the streets of Cheapside near St. Paul's Cathedral. And that's just the juiciest of the various cases described in a new paper published in the journal Criminal Law Forum.

The noblewoman was Ela Fitzpayne, wife of a knight named Sir Robert Fitzpayne, lord of Stogursey. The victim was a priest and her erstwhile lover, John Forde, who was stabbed to death in the streets of Cheapside on May 3, 1337. “We are looking at a murder commissioned by a leading figure of the English aristocracy," said University of Cambridge criminologist Manuel Eisner, who heads the Medieval Murder Maps project. "It is planned and cold-blooded, with a family member and close associates carrying it out, all of which suggests a revenge motive."

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It's been a long wait for diehard fans of Ridley Scott's Alien franchise, but we finally have a fittingly sinister official trailer for the spinoff prequel series, Alien: Earth, coming this summer to FX/Hulu.

As previously reported, the official premise is short and sweet: "When a mysterious space vessel crash-lands on Earth, a young woman (Sydney Chandler) and a ragtag group of tactical soldiers make a fateful discovery that puts them face-to-face with the planet’s greatest threat."

The series is set in 2120, two years before the events of the first film, Alien (1979), in a world where corporate interests are competing to be the first to unlock the key to human longevity—maybe even immortality. Showrunner Noah Hawley has said that the style and mythology will be closer to that film than Prometheus (2012) or Alien: Covenant, both of which were also prequels.

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Over the years, scholars of the Dead Sea Scrolls have analyzed the ancient parchments with various methods: for example, X-rays, multispectral imaging, "virtual unfolding," and paleography, i.e., studying elements in their writing styles. The scrolls are believed to date back to between the third century BCE and the first century CE, but those dates rely largely on paleography, since only a handful of the scrolls have calendar dates written on them.

However, the traditional paleographic method is inherently subjective and based on a given scholar's experience. A team of scientists has combined radiocarbon dating from 24 scroll samples and machine-learning-based handwriting analysis to create their own AI program—dubbed Enoch. The objective was to achieve more accurate date estimates, according to a new paper published in the journal PLoS ONE. Among the findings: Many of the scrolls are older than previously thought.

As reported earlier, these ancient Hebrew texts—roughly 900 full and partial scrolls in all, stored in clay jars—were first discovered scattered in various caves near what was once the settlement of Qumran, just north of the Dead Sea, by Bedouin shepherds in 1946–1947. (Apparently, a shepherd threw a rock while searching for a lost member of his flock and accidentally shattered one of the clay jars, leading to the discovery.) Qumran was destroyed by the Romans, circa 73 CE, and historians believe the scrolls were hidden in the caves by a sect called the Essenes to protect them from being destroyed. The natural limestone and conditions within the caves helped preserve the scrolls for millennia.

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It's been textbook knowledge for over a century that our Milky Way galaxy is doomed to collide with another large spiral galaxy, Andromeda, in the next 5 billion years and merge into one even bigger galaxy. But a fresh analysis published in the journal Nature Astronomy is casting that longstanding narrative in a more uncertain light. The authors conclude that the likelihood of this collision and merger is closer to the odds of a coin flip, with a roughly 50 percent probability that the two galaxies will avoid such an event during the next 10 billion years.

Both the Milky Way and the Andromeda galaxies (M31) are part of what's known as the Local Group (LG), which also hosts other smaller galaxies (some not yet discovered) as well as dark matter (per the prevailing standard cosmological model). Both already have remnants of past mergers and interactions with other galaxies, according to the authors.

"Predicting future mergers requires knowledge about the present coordinates, velocities, and masses of the systems partaking in the interaction," the authors wrote. That involves not just the gravitational force between them but also dynamical friction. It's the latter that dominates when galaxies are headed toward a merger, since it causes galactic orbits to decay.

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Netflix held its Tudum Global Fan Event in Los Angeles this weekend to showcase its upcoming slate of programming. Among the highlights: the official trailer for the third and final season of Squid Game, the first six minutes of Wednesday S2, a teaser for Guillermo del Toro's Frankenstein, and date announcements for the fifth and final season of Stranger Things, as well as Wake Up Dead Man: A Knives Out Mystery.

(Some spoilers below.)

Squid Game S3

As previously reported, Squid Game's first season followed Seong Gi-hun (Lee Jung-Jae), a down-on-his-luck gambler who has little left to lose when he agrees to play children's playground games against 455 other players for money. The twist? If you lose a game, you die. If you cheat, you die. And if you win, you might also die. In the S1 finale, Gi-hun faced off against fellow finalist and childhood friend Cho Sang-woo (Park Hae-soo) in the titular "squid game." He won their fight but refused to kill his friend. Sang-woo instead stabbed himself in the neck, leaving Gi-hun the guilt-ridden winner.

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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 has 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.

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Tired of using bulky night vision goggles for your clandestine nocturnal activities? An interdisciplinary team of Chinese neuroscientists and materials scientists has developed near-infrared contact lenses that enabled both mice and humans to see in the dark, even with their eyes closed, according to a new paper published in the journal Cell.

Humans and other mammals can only perceive a limited range of the electromagnetic spectrum (light), usually in the 400–700 nm range. There are creatures that can see in infrared (snakes, mosquitoes, bullfrogs) or ultraviolet (bees, birds), and goldfish can perceive both. But humans must augment themselves with technology in order to expand our range of vision.

Night vision goggles and similar devices have been around since the 1930s, including infrared-visible converters, but these require external energy sources, and the converters have a multilayer structure that makes them opaque and hence challenging to integrate with a human eye. The authors previously were able to confer near-infrared vision to mice by injecting nanoparticles that bind to photoreceptors into their eyes—basically creating a near-infrared nanoantenna—but realized that most people would be averse to the prospect of sticking needles in their eyes. So they looked for a better alternative. Contact lenses seemed the obvious choice.

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You've probably heard of the infamous "marshmallow test," in which young children are asked to wait to eat a yummy marshmallow placed in front of them while left alone in a room for 10 to 15 minutes. If they successfully do so, they get a second marshmallow; if not, they don't. The test has become a useful paradigm for scientists interested in studying the various factors that might influence one's ability to delay gratification, thereby promoting social cooperation. According to a paper published in the journal Royal Society Open Science, one factor is trust: If children are paired in a marshmallow test and one promises not to eat their treat for the specified time, the other is much more likely to also refrain from eating it.

As previously reported, psychologist Walter Mischel's landmark behavioral study involved 600 kids between the ages of four and six, all culled from Stanford University's Bing Nursery School. He would give each child a marshmallow and give them the option of eating it immediately if they chose. But if they could wait 15 minutes, they would get a second marshmallow as a reward. Then Mischel would leave the room, and a hidden video camera would tape what happened next.

Some kids just ate the marshmallow right away. Others found a handy distraction: covering their eyes, kicking the desk, or poking at the marshmallow with their fingers. Some smelled it, licked it, or took tiny nibbles around the edges. Roughly one-third of the kids held out long enough to earn a second marshmallow. Several years later, Mischel noticed a strong correlation between the success of some of those kids later in life (better grades, higher self-confidence) and their ability to delay gratification in nursery school. Mischel's follow-up study confirmed the correlation.

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The vast majority of people these days use some form of social media, but some develop what's known as problematic social media use (PSMU). It's not yet deemed a clinical addiction, but it does share some symptoms with addiction and substance abuse disorders. And according to a new paper published in the journal PLoS ONE, someone who exhibits PSMU is also more likely to believe in—and share—fake news online, contributing to the rampant spread of misinformation that is the bane of the 21st-century Internet.

"If someone struggles with a substance dependency, it's the decision-making process in their brain where they have difficulties stopping," co-author Dar Meshi of Michigan State University told Ars. "They take their drug and have a negative outcome: get a DUI or crash their car. Most people learn from a bad outcome and don't do it again, but someone with a substance use disorder continues to do that action."

In the case of PSMU, someone might feel bad if they are unable to access social media for an extended period (withdrawal), or their use of social media might lead to losing a job, poor grades, or mental health issues.

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Zombies never really go out of style, but they were an especially hot commodity on television in the 2010s, spawning the blockbuster series The Walking Dead (2010-2022) as well as quirkier fare like Netflix's comedy horror, The Santa Clarita Diet (2017-2018). iZombie, a supernatural procedural dramedy that ran for five seasons on the CW, falls into the latter category. It never achieved mega-hit status but nonetheless earned a hugely loyal following drawn to the show's wicked humor, well-drawn characters, and winning mix of cases-of-the-week and longer narrative arcs.

(Spoilers for all five seasons below.)

The original Vertigo comic series was created by writer Chris Roberson and artist Michael Allred. It featured a zombie in Eugene, Oregon, named Gwen Dylan, who worked as a gravedigger because she needed to consume brains every 30 days to keep her memories and cognitive faculties in working order. Her best friends were a ghost who died in the 1960s and a were-terrier named Scott, nicknamed "Spot," and together they took on challenges both personal and supernatural (vampires, mummies, etc.).

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It's long been the stuff of science fiction: humans achieving immortality by uploading their consciousness into a silicon virtual paradise, ruled over by a benevolent super-intelligent AI. Or maybe one dreams of leaving a dying Earth to colonize Mars or other distant planets. It's a tantalizing visionary future that has been embraced by tech billionaires in particular. But is that future truly the utopian ideal, or something potentially darker? And are those goals even scientifically feasible?

These are the kinds of questions astrophysicist and science journalist Adam Becker poses in his new book, More Everything Forever: AI Overlords, Space Empires, and Silicon Valley's Crusade to Control the Fate of Humanity. Becker's widely praised first book, What Is Real?, focused on competing interpretations of quantum mechanics and questioned the long dominance of the so-called Copenhagen interpretation championed by Niels Bohr, among other luminaries. This time around, he's tackling Silicon Valley's far-reaching ideas about the future, which have moved out of online subcultures and into mainstream culture, including our political discourse.

"It seemed like it was only going to become more relevant and someone needed to speak out about it, and I didn't see enough people connecting the dots in a way that looked right to me," Becker told Ars. "One current critique of Silicon Valley is that they moved fast and broke democracy and institutional norms. That's true. Another is that they're contemptuous of government, and I think that's true, too. But there wasn't much critique of their visions of the future, maybe because not enough people realized they meant it. Even among Silicon Valley critics, there was this idea that at the very least, you could trust that the statements they made about science and technology were true because they were experts in science and technology. That's not the case."

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It's been a long, long wait, but we're finally getting a second season of the Netflix supernatural horror comedy, Wednesday. The streaming giant dropped the first teaser and several first-look images to whet our appetites for what promises to be an excellent follow-up to the delightful first season.

(Spoilers for S1 below.)

As previously reported, director Tim Burton famously turned down the opportunity to direct the 1991 feature film The Addams Family, inspired by characters created by American cartoonist Charles Addams for The New Yorker in 1938. Wednesday showrunners Alfred Gough and Miles Millar—best known for Smallville—expected Burton to turn them down as well when they made their pitch. He signed up for the project instead.

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Several years ago, Harvard University roboticist Robert Wood made headlines when his lab constructed RoboBee, a tiny robot capable of partially untethered flight. Over the years, RoboBee has learned to fly, dive, and hover. The latest improvement: RoboBee has learned how to stick the landing, thanks to biomechanical improvements to its landing gear modeled on the crane fly, which has a similar wingspan and body size to the RoboBee platform. The details of this achievement appear in a new paper published in the journal Science Robotics.

As previously reported, the ultimate goal of the RoboBee initiative is to build a swarm of tiny interconnected robots capable of sustained, untethered flight—a significant technological challenge, given the insect-sized scale, which changes the various forces at play. In 2019, Wood's group announced its achievement of the lightest insect-scale robot so far to have achieved sustained, untethered flight—an improved version called the RoboBee X-Wing. In 2021, Wood's group turned its attention to the biomechanics of the mantis shrimp's knock-out punch and built a tiny robot to mimic that movement.

But RoboBee was not forgotten, with the team focusing this time around on achieving more robust landings. “Previously, if we were to go in for a landing, we’d turn off the vehicle a little bit above the ground and just drop it, and pray that it will land upright and safely,” said co-author Christian Chan, one of Wood's graduate students. The trick is to minimize velocity when approaching a surface and then quickly dissipating impact energy. Even something as small and light as RoboBee can generate significant impact energy. The crane fly has long, jointed appendages that enable them to dampen their landings, so the insect served as a useful model for RoboBee's new landing gear.

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More than 45 million people in the US are fans of bowling, with national competitions awarding millions of dollars. Bowlers usually rely on instinct and experience, earned through lots and lots of practice, to boost their strike percentage. A team of physicists has come up with a mathematical model to better predict ball trajectories, outlined in a new paper published in the journal AIP Advances. The resulting equations take into account such factors as the composition and resulting pattern of the oil used on bowling lanes, as well as the inevitable asymmetries of bowling balls and player variability.

The authors already had a strong interest in bowling. Three are regular bowlers and quite skilled at the sport; a fourth, Curtis Hooper of Longborough University in the UK, is a coach for Team England at the European Youth Championships. Hooper has been studying the physics of bowling for several years, including an analysis of the 2017 Weber Cup, as well as papers devising mathematical models for the application of lane conditioners and oil patterns in bowling.

The calculations involved in such research are very complicated because there are so many variables that can affect a ball's trajectory after being thrown. Case in point: the thin layer of oil that is applied to bowling lanes, which Hooper found can vary widely in volume and shape among different venues, plus the lack of uniformity in applying the layer, which creates an uneven friction surface.

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Kevin Peterson is a "nose" for his own perfume company, Sfumato Fragrances, by day. By night, Sfumato's retail store in Detroit transforms into Peterson's craft cocktail bar, Castalia, where he is chief mixologist and designs drinks that pair with carefully selected aromas. He's also the author of Cocktail Theory: A Sensory Approach to Transcendent Drinks, which grew out of his many (many!) mixology experiments and popular YouTube series, Objective Proof: The Science of Cocktails.

It's fair to say that Peterson has had an unusual career trajectory. He worked as a line cook and an auto mechanic, and he worked on the production line of a butter factory, among other gigs, before attending culinary school in hopes of becoming a chef. However, he soon realized it wasn't really what he wanted out of life and went to college, earning an undergraduate degree in physics from Carleton College and a PhD in mechanical engineering from the University of Michigan.

After 10 years as an engineer, he switched focus again and became more serious about his side hobby, perfumery. "Not being in kitchens anymore, I thought—this is a way to keep that little flavor part of my brain engaged," Peterson told Ars. "I was doing problem sets all day. It was my escape to the sensory realm. 'OK, my brain is melting—I need a completely different thing to do. Let me go smell smells, escape to my little scent desk.'" He and his wife, Jane Larson, founded Sfumato, which led to opening Castalia, and Peterson finally found his true calling.

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A rogue cyborg security (SEC) unit gains autonomy and must learn to interact with humans while hiding its new capability in the trailer for Murderbot, Apple TV+'s new 10-episode sci-fi comedic thriller starring Alexander Skarsgård. It's based on the bestselling book series The Murderbot Diaries by Martha Wells. And judging from the trailer, Murderbot looks like it will strike just the right balance between humor and action.

There are seven books in Wells' series thus far. All are narrated by Murderbot, who is technically owned by a megacorporation but manages to hack and override its governor module. Rather than rising up and killing its former masters, Murderbot just goes about performing its security work, relieving the boredom by watching a lot of entertainment media.

In the first book, All Systems Red, Murderbot saves a scientific expedition on an alien planet when they are attacked by a giant alien creature. During the ensuing investigation, the cyborg uncovers a plot against the expedition, as well as a second team, by yet another team intent on killing their rivals for some reason. Murderbot joins the humans in foiling those murderous plans but escapes onto a cargo ship at the end rather than give up its hard-earned autonomy.

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Coffee is one of the most popular beverages in the world, counting many scientists among its fans. Naturally those scientists are sometimes drawn to study their beloved beverage from various angles with an eye toward achieving the perfect cup.

While espresso has received the lion's share of such attention, physicists at the University of Pennsylvania have investigated the physics behind brewing so-called "pour-over" coffee, in which hot water is poured over coffee grounds in a filter within a funnel-shaped cone and allowed to percolate and drip into a cup below. The trick is to pour the water from as high as possible without letting the jet of water break up upon impact with the grounds, according to their new paper published in the journal Physics of Fluids.

In 2020, we reported on a mathematical model for brewing the perfect cup of espresso with minimal waste. Many variables can affect the quality of a steaming cup of espresso, including so-called "channeling" during the brewing process, in which the water doesn't seep uniformly through the grounds but branches off in various preferential paths instead. This significantly reduces the extraction yield (EY)—the fraction of coffee that dissolves into the final beverage—and thus the quality of the final brew. That, in turn, depends on controlling water flow and pressure as the liquid percolates through the coffee grounds.

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Enthusiasm was understandably high for Daredevil: Born Again, Marvel's revival of the hugely popular series in the Netflix Defenders universe. Not only was Charlie Cox returning to the title role as Matt Murdock/Daredevil, but Vincent D'Onofrio was also coming back as his nemesis, crime lord Wilson Fisk/Kingpin. Their dynamic has always been electric, and that on-screen magic is as powerful as ever in Born Again, which quickly earned critical raves and a second season that is currently filming.

(Some spoilers for the series below, but no major reveals beyond the opening events of the first episode.)

Born Again was initially envisioned as more of an episodic reset rather than a straight continuation of the serialized Netflix series. But during the 2023 Hollywood strikes, with production halted, the studio gave the show a creative overhaul more in line with the Netflix tone, even though six episodes had been largely completed by then. The pilot was reshot completely, and new footage was added to subsequent episodes to ensure narrative continuity with the original Daredevil—with a few well-placed nods to other characters in the MCU for good measure.

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