A plucky male American stag beetle thinks he's found a mate on a rotting old tree stump—and then realizes there's another male eager to make the same conquest. The two beetles face off in battle, until the first manages to get enough leverage to toss his romantic rival off the stump in a deft display of insect jujitsu. It's the first time this mating behavior has been captured on film, and the stag beetle is just one of the many fascinating insects featured in the second season of A Real Bug's Life, a National Geographic docuseries narrated by Awkwafina.

The genesis for the docuseries lies in a past rumored sequel to Pixar's 1998 animated film A Bug's Life, which celebrated its 25th anniversary two years ago. That inspired producer Bill Markham, among others, to pitch a documentary series on a real bug's life to National Geographic. "It was the quickest commission ever," Markham told Ars last year. "It was such a good idea, to film bugs in an entertaining family way with Pixar sensibilities." And thanks to the advent of new technologies—photogrammetry, probe and microscope lenses, racing drones, ultra-high-speed camera—plus a handful of skilled "bug wranglers," the team was able to capture the bug's-eye view of the world beautifully.

As with the Pixar film, the bugs (and adjacent creatures) are the main characters here, from cockroaches, monarch butterflies, and praying mantises to bees, spiders, and even hermit crabs. The 10 episodes, across two seasons, tell their stories as they struggle to survive in their respective habitats, capturing entire ecosystems in the process: city streets, a farm, the rainforest, a Texas backyard, and the African savannah, for example. Highlights from S1 included the first footage of cockroach egg casings hatching; wrangling army ants on location in a Costa Rica rainforest; and the harrowing adventures of a tiny jumping spider navigating the mean streets of New York City.

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Scientists have demonstrated that an ancient human skull excavated from a tomb at Ephesos was not that of Arsinoë IV, half-sister to Cleopatra VII. Rather, it's the skull of a young male between the ages of 11 and 14 from Italy or Sardinia, who may have suffered from one or more developmental disorders, according to a new paper published in the journal Scientific Reports. Arsinoë IV's remains are thus still missing.

Arsinoë IV led quite an adventurous short life. She was either the third or fourth daughter of Ptolemy XII, who left the throne to Cleopatra and his son, Ptolemy XIII, to rule together. Ptolemy XIII didn't care for this decision and dethroned Cleopatra in a civil war—until Julius Caesar intervened to enforce their father's original plan of co-rulership. As for Arsinoë, Caesar returned Cyprus to Egyptian rule and named her and her youngest brother (Ptolemy XIV) co-rulers. This time, it was Arsinoë who rebelled, taking command of the Egyptian army and declaring herself queen.

She was fairly successful at first in battling the Romans, conducting a siege against Alexandria and Cleopatra, until her disillusioned officers decided they'd had enough and secretly negotiated with Caesar to turn her over to him. Caesar agreed, and after a bit of public humiliation, he granted Arsinoë sanctuary in the temple of Artemis in Ephesus. She lived in relative peace for a few years, until Cleopatra and Mark Antony ordered her execution on the steps of the temple—a scandalous violation of the temple as a place of sanctuary. Historians disagree about Arsinoë's age when she died: Estimates range from 22 to 27.

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In 2019, astronomer Britt Lundgren of the University of North Carolina Asheville visited the Guggenheim Museum in New York City to take in an exhibit of the works of Swedish painter Hilma af Klint. Lundgren noted a striking similarity between the abstract geometric shapes in af Klint's work and scientific diagrams in 19th century physicist Thomas Young's Lectures (1807). So began a four-year journey starting at the intersection of science and art that has culminated in a forthcoming paper in the journal Leonardo, making the case for the connection.

Af Klint was formally trained at the Royal Academy of Fine Arts and initially focused on drawing, portraits, botanical drawings, and landscapes from her Stockholm studio after graduating with honors. This provided her with income, but her true life's work drew on af Klint's interest in spiritualism and mysticism. She was one of "The Five," a group of Swedish women artists who shared those interests. They regularly organized seances and were admirers of theosophical teachings of the time.

It was through her work with The Five that af Klint began experimenting with automatic drawing, driving her to invent her own geometric visual language to conceptualize the invisible forces she believed influenced our world. She painted her first abstract series in 1906 at age 44. Yet she rarely exhibited this work because she believed the art world at the time wasn't ready to appreciate it. Her will requested that the paintings stay hidden for at least 20 years after her death.

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Most crossword puzzle fans have experienced that moment where, after a period of struggle on a particularly difficult puzzle, everything suddenly starts to come together, and they are able to fill in a bunch of squares correctly. Alexander Hartmann, a statistical physicist at the University of Oldenburg in Germany, had an intriguing insight when this happened while he was trying to solve a puzzle one day. According to his paper published in the journal Physical Review E, the crossword puzzle-solving process resembles a type of phase transition known as percolation—one that seems to be unique compared to standard percolation models.

Traditional mathematical models of percolation date back to the 1940s. Directed percolation is when the flow occurs in a specific direction, akin to how water moves through freshly ground coffee beans, flowing down in the direction of gravity. (In physical systems, percolation is one of the primary mechanisms behind the Brazil nut effect, along with convection.) Such models can also be applicable to a wide range of large networked systems: power grids, financial markets, and social networks, for example.

Individual nodes in a random network start linking together, one by one, via short-range connections, until the number of connections reaches a critical threshold (tipping point). At that point, there is a phase shift in which the largest cluster of nodes grows rapidly, giving rise to more long-range connections, resulting in uber-connectivity. The likelihood of two clusters merging is proportional to their size, and once a large cluster forms, it dominates the networked system, absorbing smaller clusters.

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The piano-mover puzzle involves trying to transport an oddly shaped load across a constricted environment with various obstructions. It's one of several variations on classic computational motion-planning problems, a key element in numerous robotics applications. But what would happen if you pitted human beings against ants in a competition to solve the piano-mover puzzle?

According to a paper published in the Proceedings of the National Academy of Sciences, humans have superior cognitive abilities and, hence, would be expected to outperform the ants. However, depriving people of verbal or nonverbal communication can level the playing field, with ants performing better in some trials. And while ants improved their cognitive performance when acting collectively as a group, the same did not hold true for humans.

Co-author Ofer Feinerman of the Weizmann Institute of Science and colleagues saw an opportunity to use the piano-mover puzzle to shed light on group decision-making, as well as the question of whether it is better to cooperate as a group or maintain individuality. "It allows us to compare problem-solving skills and performances across group sizes and down to a single individual and also enables a comparison of collective problem-solving across species," the authors wrote.

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HBO released a new one-minute teaser for the second season of its post-apocalyptic drama The Last of Us during CES last night, along with a release date of April 2025. Based on developer Naughty Dog's hugely popular video game franchise, S2 is set five years after the events of the first season and finds the bond beginning to fray between plucky survivors Joel (Pedro Pascal) and Ellie (Bella Ramsey) while introducing several new characters.

(Spoilers for S1 below.)

The series takes place in the 20-year aftermath of a deadly outbreak of mutant fungus (Cordyceps) that turns humans into monstrous zombie-like creatures (the Infected, or Clickers). The world has become a series of separate totalitarian quarantine zones and independent settlements, with a thriving black market and a rebel militia known as the Fireflies making life complicated for the survivors. Joel is a hardened smuggler tasked with escorting the teenage Ellie across the devastated US, battling hostile forces and hordes of zombies, to a Fireflies unit outside the quarantine zone. Ellie is special: She is immune to the deadly fungus, and the hope is that her immunity holds the key to beating the disease.

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Some version of the Hula-Hoop has been around for millennia, but the popular plastic version was introduced by Wham-O in the 1950s and quickly became a fad. Now, researchers have taken a closer look at the underlying physics of the toy, revealing that certain body types are better at keeping the spinning hoops elevated than others, according to a new paper published in the Proceedings of the National Academy of Sciences.

“We were surprised that an activity as popular, fun, and healthy as hula hooping wasn’t understood even at a basic physics level,” said co-author Leif Ristroph of New York University. “As we made progress on the research, we realized that the math and physics involved are very subtle, and the knowledge gained could be useful in inspiring engineering innovations, harvesting energy from vibrations, and improving in robotic positioners and movers used in industrial processing and manufacturing.”

Ristroph's lab frequently addresses these kinds of colorful real-world puzzles. For instance, in 2018, Ristroph and colleagues fine-tuned the recipe for the perfect bubble based on experiments with soapy thin films. In 2021, the Ristroph lab looked into the formation processes underlying so-called "stone forests" common in certain regions of China and Madagascar.

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Members of the Elsevier-published Journal of Human Evolution quit, citing AI production processes introducing errors, high author fees, and concerns over editorial independence.

Squid Game's hotly anticipated second season debuted on Netflix the day after Christmas and racked up more than 68 million views in just three days. It had already been renewed for a third and final season—filmed back-to-back with S2—but Netflix ushered in the new year by gracing us with a 15-second teaser on X, introducing a brand new killer doll dubbed Chul-su—similar to the giant "Red Light, Green Light" doll Young-hee.

(Spoilers for S1 below; some spoilers for S2 but no major reveals.)

As previously reported, the first season followed Seong Gi-hun (Lee Jung-Jae, seen earlier this year in The Acolyte), 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.

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Back in 2019, we told you about an intriguing experiment to test a famous anthropological legend about an elderly Inuit man in the 1950s who fashioned a knife out of his own frozen feces. He used it to kill and skin a dog, using its rib cage as a makeshift sled to venture off into the Arctic. Metin Eren, an archaeologist at Kent State University, fashioned rudimentary blades out of his own frozen feces to test whether they could cut through pig hide, muscle, and tendon.

Sadly for the legend, the blades failed every test, but the study was colorful enough to snag Eren an Ig Nobel Prize the following year. And it's just one of the many fascinating projects routinely undertaken in his Experimental Archaeology Laboratory, where he and his team try to reverse-engineer all manner of ancient technologies, whether they involve stone tools, ceramics, metal, butchery, textiles, and so forth.

Eren's lab is quite prolific, publishing 15 to 20 papers a year. “The only thing we’re limited by is time,” he said. Many have colorful or quirky elements and hence tend to garner media attention, but Eren emphasizes that what he does is very much serious science, not entertainment. “I think sometimes people look at experimental archaeology and think it’s no different from LARPing,” Eren told Ars. “I have nothing against LARPers, but it’s very different. It’s not playtime. It’s hardcore science. Me making a stone tool is no different than a chemist pouring chemicals into a beaker. But that act alone is not the experiment. It might be the flashiest bit, but that's not the experimental process.”

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There aren't that many movies specifically set on New Year's Eve, but one of the best is The Hudsucker Proxy (1994), Joel and Ethan Coen's visually striking, affectionate homage to classic Hollywood screwball comedies. The film turned 30 this year, so it's the perfect opportunity for a rewatch.

(WARNING: Spoilers below.)

The Coen brothers started writing the script for The Hudsucker Proxy when Joel was working as an assistant editor on Sam Raimi's The Evil Dead (1981). Raimi ended up co-writing the script, as well as making a cameo appearance as a brainstorming marketing executive.  The Coen brothers took their inspiration from the films of Preston Sturgess and Frank Capra, among others, but the intent was never to satirize or parody those films. "It's the case where, having seen those movies, we say 'They're really fun—let's do one!'; as opposed to "They're really fun—let's comment upon them,'" Ethan Coen has said.

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Over the holiday weekend, all but one member of the editorial board of Elsevier's Journal of Human Evolution (JHE) resigned "with heartfelt sadness and great regret," according to Retraction Watch, which helpfully provided an online PDF of the editors' full statement. It's the 20th mass resignation from a science journal since 2023 over various points of contention, per Retraction Watch, many in response to controversial changes in the business models used by the scientific publishing industry.

"This has been an exceptionally painful decision for each of us," the board members wrote in their statement. "The editors who have stewarded the journal over the past 38 years have invested immense time and energy in making JHE the leading journal in paleoanthropological research and have remained loyal and committed to the journal and our authors long after their terms ended. The [associate editors] have been equally loyal and committed. We all care deeply about the journal, our discipline, and our academic community; however, we find we can no longer work with Elsevier in good conscience."

The editorial board cited several changes made over the last ten years that it believes are counter to the journal's longstanding editorial principles. These included eliminating support for a copy editor and a special issues editor, leaving it to the editorial board to handle those duties. When the board expressed the need for a copy editor, Elsevier's response, they said, was "to maintain that the editors should not be paying attention to language, grammar, readability, consistency, or accuracy of proper nomenclature or formatting."

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There is rarely time to write about every cool science paper that comes our way; many worthy candidates sadly fall through the cracks over the course of the year. But as 2024 comes to a close, we've gathered ten of our favorite such papers at the intersection of science and culture as a special treat, covering a broad range of topics: from reenacting Bronze Age spear combat and applying network theory to the music of Johann Sebastian Bach, to Spider-Man inspired web-slinging tech and a mathematical connection between a turbulent phase transition and your morning cup of coffee. Enjoy!

Reenacting Bronze Age spear combat

An experiment with experienced fighters who spar freely using different styles. Credit: Valerio Gentile/CC BY

The European Bronze Age saw the rise of institutionalized warfare, evidenced by the many spearheads and similar weaponry archaeologists have unearthed. But how might these artifacts be used in actual combat? Dutch researchers decided to find out by constructing replicas of Bronze Age shields and spears and using them in realistic combat scenarios. They described their findings in an October paper published in the Journal of Archaeological Science.

There have been a couple of prior experimental studies on bronze spears, but per Valerio Gentile (now at the University of Gottingen) and coauthors, practical research to date has been quite narrow in scope, focusing on throwing weapons against static shields. Coauthors C.J. van Dijk of the National Military Museum in the Netherlands and independent researcher O. Ter Mors each had more than a decade of experience teaching traditional martial arts, specializing in medieval polearms and one-handed weapons. So they were ideal candidates for testing the replica spears and shields.

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'Tis the season for many holiday traditions, including the Ugly Christmas Sweater—you know, those 1950s-style heavy knits featuring some kind of cartoonish seasonal decoration, like snowflakes, Santa Claus, or—in the case of Mark Darcy from Bridget Jones' Diary (2001)—Rudolph the Red-Nosed Reindeer. "It’s obnoxious and tacky, but also fuzzy and kind of wholesome—the fashion equivalent of a Hallmark Christmas movie (with a healthy dose of tongue-in-cheek)," as CNN's Marianna Cerini recently observed.

Fashion (or lack thereof) aside, sweaters and other knitted fabric are also fascinating to physicists and mathematicians. Case in point: a recent paper published in the journal Physical Review Letters examining the complex mechanics behind the many resting shapes a good Jersey knit can form while at rest.

Knitted fabrics are part of a class of intertwined materials—which also includes birds' nests, surgical knots, knotted shoelaces, and even the degradation of paper fibers in ancient manuscripts. Knitted fabrics are technically a type of metamaterial: an engineered material that gets its properties not from the base materials but from their designed structures. The elasticity (aka, stretchiness) of knitted fabrics is an emergent property: the whole is more than the sum of its parts. How those components (strands of yarn) are arranged at an intermediate scale (the structure) determines the macro scale properties of the resulting fabric.

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There are thousands of YouTube videos in which DIY science enthusiasts cut grapes in half—leaving just a thin bit of skin connecting them—and put the grapes in the microwave, just to marvel at the sparks and plume of ionized gas (plasma) that the grapes produce. This quirky property of grapes might help make more efficient quantum sensors, according to a new paper published in the journal Physical Review Applied.

The plasma-inducing grape effect was first observed in 1994, per the authors. As previously reported, the usual explanation for the generation of plasmas is that grapes are so small that the irradiating microwaves become highly concentrated in the grape tissue, ripping some the molecules apart to generate charged ions (adding to the electrolytes already present in the grapes). The electromagnetic field that forms causes ions to flow from one grape half to the other via the connecting skin—at least at first. That's when you get the initial sparks. Eventually, the ions start passing through the surrounding air as well, ionizing it to produce that hot plume of plasma.

But in 2019, Trent University scientists showed that explanation isn't quite right. The skin bridge isn't necessary for the effect to occur. Rather, the plasma is generated by an electromagnetic "hot spot." The grapes have the right refractive index and size to "trap" microwaves, so putting two of them close together leads to the generation of a hot spot between them. The trick also works with gooseberries, large blackberries, and quail eggs, as well as hydrogel beads—plastic beads soaked in water. ("Many microwaves were in fact harmed during the experiments," co-author Hamza Khattak admitted at the time.)

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Everyone has their favorite film that serves as alternative Christmas movie fare, with Die Hard (1988) and Lethal Weapon (1987) typically topping the list—at least when all you want for Christmas is buddy-cop banter, car chases, shootouts, and glorious explosions. (Massive gratuitous property damage is a given.) I love me some Lethal Weapon but it's high time to give some holiday love to another great action flick set during the Christmas season: The Long Kiss Goodnight (1996), starring Geena Davis as an amnesiac school teacher who turns out to have been a government assassin in her former life.

(Spoilers below for this nearly 30-year-old film.)

At the time, Davis was married to director Renny Harlin, coming off a disastrous showing for their previous collaboration, Cutthroat Island (1995), which remains one of the biggest box office bombs of all time. (It is indeed a pretty bad movie.) But Shane Black's smart, savvy script for The Long Kiss Goodnight seemed like the perfect next project for them; it was promising enough that New Line Cinema bought it for what was then a record $4 million.

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Editor's note: Warning: Although we’ve done our best to avoid spoiling anything major, please note this list does include a few specific references to several of the listed shows that some might consider spoiler-y.

This was another good year for television, with established favorites sharing space on our list with some intriguing new shows. Really, 2024 had a little of everything, from wacky crime capers (Bad Monkey) and Satanic Panic (Hysteria) to dystopian video game adaptations (Fallout) and sweeping historical epics (Shōgun), with plenty of genre-mashup delights in between. While streaming platforms continue to dominate, the selection is more evenly distributed across them this year, with only Hulu and Netflix snagging more than two slots (depending on whether or not you lump Hulu together with Disney+ after the merger).

As always, we're opting for an unranked list, with the exception of our "year's best" vote at the very end, so you might look over the variety of genres and options and possibly add surprises to your eventual watchlist. We invite you to head to the comments and add your own favorite TV shows released in 2024.

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Director Denis Villeneuve's stunning two-part film adaptation of Frank Herbert's Dune has received many well-deserved accolades—with Dune: Part 2 being crowned Ars Technica's top movie of 2024. The films also spawned a lavish HBO spinoff TV series, Dune: Prophecy, just renewed for a second season right before a momentous season finale.

(Some spoilers below for S1 of Dune: Prophecy, but no major plot reveals.)

Dune: Prophecy is a prequel series inspired by the novel Sisterhood of Dune, written by Brian Herbert and Kevin J. Anderson, exploring the origins of the Bene Gesserit. It's set 10,000 years before the ascension of Paul Atreides and follows two Harkonnen sisters as they combat forces that threaten the future of humankind, establishing the fabled sect that will become the Bene Gesserit in the process.

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Editor's note: Warning: Although we’ve done our best to avoid spoiling anything too major, please note this list does include a few specific references to several of the listed films that some might consider spoiler-y.

This was the year that Marvel Studios hit the pause button on its deluge of blockbuster superhero movies, after rather saturating the market in recent years. It proved to be a smart move: the only Marvel theatrical release was the R-rated Deadpool & Wolverine, a refreshingly irreverent, very meta take on the genre that delighted audiences and lit up the global box office. Perhaps audiences aren't so much bored with superhero movies as becoming more discriminating in their choices. Give us a fun, fresh take and we'll flock back to theaters.

Fewer superhero franchise entries meant there was more breathing room for other fare. Horror in particular had a stellar year, with numerous noteworthy offerings, touching on body horror (The Substance), Satanic Panic (Late Night with the Devil), psychological horror (Heretic), hauntings (The Oddity), a rom-com/revenge mashup (Your Monster), an inventive reimagining of a classic silent film (Nosferatu), and one very bloodthirsty child vampire with a wicked sense of humor (Abigail). Throw in a smattering of especially strong sequels (Inside Out 2, Dune: Part 2), a solid prequel (Furiosa), and a few hidden gems, and we had one of the better years for film in recent memory.

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The Internet has been buzzing the last few days about James Gunn's Superman reboot slated for release next year. The studio released a "motion poster" earlier this week set to a moody cover of John Williams' "Superman March," as well as a teaser for a teaser for the film. That teaser just dropped.

Clearly, given all the buildup, what director James Gunn wants for Christmas is for everyone to get excited over his Superman movie. And you know what? It kinda worked, especially since Superman's dog Krypto makes an adorably welcome appearance.

Gunn describes his take as less of an origin story and more of a journey, with Superman struggling to reconcile his Kryptonian heritage and aristocratic origins with his small-town, adoptive human family. Gunn tapped David Corenswet to play Clark Kent/Superman, at 25 a bit more established than the young cub reporter of Smallville, for instance. Rachel Brosnahan plays Lois Lane, Skyler Gisondo plays Jimmy Olsen, and Nicholas Holt is arch-nemesis Lex Luther. (Holt's son shaved his head for the role.) Luther's sidekicks are played by Sara Sampaio as Eve Teschmacher and Terence Rosemore as Otis.

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