Last week, we looked at a new study of the origin of complex cells, one that showed that our ancestors’ genomes were pieced together from bits and pieces of multiple species. It put a spotlight on a phenomenon called horizontal gene transfer, in which a gene from one species is incorporated into the genome of a distantly related species. The frequency of horizontal gene transfer means that, in addition to the neatly branching trees that relate species by common descent, there are small threads connecting distant branches of the tree of life.

It’s easy to see why horizontal gene transfer would be common among microbes. They often live in complex communities that are likely awash in the DNA of dead and damaged cells. Plus, bacteria and archaea lack a membrane between their DNA and the rest of the cell, making it easier for environmental DNA to find its way to the genome.

However, a new study this week shows that horizontal gene transfers are remarkably common even in multicellular animals. And it does so by examining the genomes of multiple cockroach species, which have had bits of bacterial DNA for millions of years.

Going horizontal

Neither bacteria nor archaea keep their DNA in a structure like the nucleus. As a result, any DNA that finds its way inside the cell has the potential to become intermingled with the genome and be incorporated permanently. That permanent incorporation is often aided by the DNA damage repair enzymes, which sometimes “fix” damage by inserting any DNA they come across in a cell.

Another reason horizontal gene transfer is a big factor among microbes is that they lack dedicated germ cells. If foreign DNA gets incorporated into the genome of any cell, it will be inherited by any descendants of that cell. In contrast, in multicellular animals, any foreign DNA incorporated into the genome of a liver cell will not be inherited by anything. So, you not only have to get the foreign DNA into the nucleus, but it also needs to get into the nucleus of the right cell.

https://arstechnica.com/science/2026/06/cockroaches-scurry-around-with-thousands-of-pieces-of-bacterial-genomes/

Early in the 11th century, a young Benedictine monk named Eilmer jumped from the 150-foot tower of his abbey in the small English town of Malmesbury, wearing a pair of crude wings he’d fashioned from willow wood and cloth. Eilmer managed to glide a good 600 feet, passing over the city wall before crash-landing in a small valley near the river Avon. The fall broke both his legs, crippling him. Malmesbury Abbey still boasts a stained-glass window in honor of Brother Eilmer.

This legendary experiment in medieval aviation comes to us via 12th-century historian William of Malmesbury in an account written circa 1125, although William neglected to provide future historians with an exact date for the feat. But William does mention another key episode in Eilmer’s life when the monk was “advanced in years”: Eilmer witnessed Halley’s comet in 1066, commenting, “It is long since I saw you.” Some historians have interpreted this to mean that Eilmer saw Halley’s comet on an earlier fly-by in 989, when he would have been a young boy.

Assuming Eilmer was at least five years would in 989, he would have been born no later than 984. This would make Eilmer in his 80s in 1066, with his attempt at flight—which occurred when he was “in his first youth”—likely falling between 1000 and 1010. However, it’s an estimate that is based on a lot of assumption, according to James Aitcheson of the University of Leicester, who argues in a paper published in the journal Notes and Queries that Eilmer may have seen a different comet altogether in his youth—the comet of 1018. If so, he would have been born much later and the date of his flight would have occurred between the 1020s and 1040s.

https://arstechnica.com/science/2026/06/did-a-medieval-flying-monk-spot-halleys-comet-twice-its-complicated/

The study only covers living arbuscular mycorrhizal fungal networks, Stewart said, and doesn’t include dead fungal networks, which also help to store carbon and add to the total biomass and influence of the networks on ecosystems. Research into dead fungal networks is still being explored.

The study also found where these networks are most threatened. Fungal network densities across croplands are about half of what they are in wild ecosystems. Meanwhile, wild grassland ecosystems hold about 40 percent of the world’s arbuscular mycorrhizal biomass. Yet those grasslands are among Earth’s least protected ecosystems, and they are converted into farmland at four times the rate of forests, posing a potential threat to these networks and the benefits they bring to plant life and carbon storage.

Previous research from SPUN has found 90 percent of fungal communities across the globe are unprotected, and many ecosystems, like the deserts of the American Southwest, are understudied.

What exactly is driving mycorrhizal fungi losses, and the consequences of that decline, need to be explored next, the researchers said, which is why the SPUN team will be at this year’s United Nations Climate Change Conference—COP31—to present to policymakers about the importance of the networks and the role they could play in protecting ecosystems and sequestering carbon.

Understanding mycorrhizal fungi more deeply at the ground level is key, said Corentin Bisot, an AMOLF biophysicist and co-author of the study.

“We’re still far from completely understanding how, if you have a grassland next door, and you want to [increase] microbes and fungi there,” Bisot said. “We don’t have the toolbox for you to do it.”

This study, Stewart said, is just the first map. And like the first maps the Spaniards drew of California—which presented the state as an island, he said, there will be new discoveries about the density of fungi networks around the globe to grow the public’s understanding of them.

This article originally appeared on Inside Climate News, a nonprofit, non-partisan news organization that covers climate, energy, and the environment. Sign up for their newsletter here.

https://arstechnica.com/science/2026/06/threads-of-underground-fungal-networks-are-long-enough-to-reach-beyond-the-solar-system/

That doesn’t mean the error-corrected qubit was fully stable. Eventually, one of the errors that inevitably occurred couldn’t be recovered from because too many of its individual atoms changed state at once. But performing normal error correction could keep some of these logical qubits stable for up to 90 rounds.

Again, that’s not good enough for any sort of sophisticated calculation. But it’s a lot closer than the company was before working out this technique.

Resonating

EeroQ is a startup with a distinct approach to qubits. A number of companies are looking into using the spin of electrons as their qubits, typically because it’s easy to fabricate chips that can manipulate electrons held in quantum dots. EeroQ is making its chips with lots of tiny pools that can hold a drop of liquid helium. When an electron is placed on that drop, it has nowhere to go because helium hates to carry an extra electron. So, the lone electron just floats on the surface.

Which is great, but it was already well-established physics long before the company launched. The problem was that nobody had figured out a method to interact with the electron in useful ways.

Recently, the company released a manuscript describing a new version of its chip, one with a small resonator next to the helium-filled pool. They showed that this resonator could couple with the movement of the electron, which is kept from hitting the walls of the pool by an electrical field. Since the electron’s motional states are quantized, the resonator adopts one or two states during the experimental procedure, which is the potential building block of a qubit.

Again, that’s nowhere near having functional computing hardware. But again, it’s this sort of incremental work that’s needed if any of these technologies is going to live up to its promise.

https://arstechnica.com/science/2026/06/microsoft-atom-computing-eeroq-update-their-quantum-computing-progress/

At the same time, the plants unable to detect the molecular signature of the caterpillar’s drool were largely ignored by the wasps. They weren’t completely defenseless, though. “There are other papers that show if you knock out all immune signaling, the caterpillars grow twice as big—they get enormous,” Steinbrenner says. This, he suggests, indicates the immune system had other pathways to deter herbivores like the caterpillars.

Crop defense systems

While the team connected the broken inceptin receptor to a muted distress call, the exact downstream immune signaling pathway isn’t fully understood. The authors suspect that the highly specific caterpillar detection they saw piggybacks on the plant’s general wound response, potentially triggering secondary internal alarms known as damage-associated molecular patterns, or DAMPs. Exactly how the initial receptor activation ultimately translates into the production of volatile organic compounds remains a puzzle.

Another caveat lies in the choice of the attacker. The Spodoptera exigua, known as the beet armyworm, is a generalist herbivore, meaning it feeds on a wide variety of plants and is rather susceptible to botanical defenses. Specialist herbivores that feed on specific plants likely evolve metabolic countermeasures to detoxify or otherwise bypass chemical defenses of their hosts. In the study, the researchers acknowledge that we’re not yet sure whether a functional inceptin receptor provides broad-spectrum resistance, or if specialized pests can fool this alarm system.

Finally, in the Oaxacan field test, the team showed that predatory wasps use the airborne distress signals to find their prey, but the relative importance of direct leaf defenses versus this indirect wasp recruitment isn’t clear. In their future research, the scientists want to investigate this in more detail. Still, the team hopes their work will help us better protect crops like bean plants from pests.

“Today, we do that with chemicals, with pesticides, but if we could use the best receptors and the best volatiles from lots of different plants, maybe we might be able to confer immunity to most problematic pests or pathogens in a sort of targeted way,” Steinbrenner says. “That’s the big picture, the goal of our lab in the long run. And I think doing that would mean understanding more of these types of receptors and volatiles.”

Science Advances, 2026. DOI: 10.1126/sciadv.aec3229

https://arstechnica.com/science/2026/06/beans-use-an-immune-receptor-to-call-in-airstrikes-on-caterpillars/

When the team returned to the sites, they determined which decorations had been selected from the slush pile and moved to a bower, and whether it came from an urban or rural source. After recording the data, all the original decorations were returned to their bowers.

Green glass and red wire

The subsequent analysis revealed that rural bowerbirds most often used green glass and green leaves or seeds for decoration, while urban birds preferred green glass and red wire. Plastic items were also popular, although “we also found items including a pair of handcuffs, medicine jars at bowers near a hospital, and fluorescent mouth guards from a site near an Australian Rules football ground,” said University of Exeter co-author Caitlin Evans.

Urban bower decorations were more than 10 times more likely to be human-made than those of rural bowers, which had more natural items, such as fruit, seeds, leaves, and sticks. Urban bowers also had nearly five times as many decorations as rural ones, averaging 90 items per bower compared to 20 for the rural birds. One overachieving urban male gathered 300 items to decorate his bower. Both urban and rural male bowerbirds showed a strong preference for human items when given a choice of items sourced from each environment. And red decorations in urban bowers were more vivid, and the green items duller, than in rural bowers.

https://arstechnica.com/science/2026/06/male-bowerbirds-prefer-colorful-human-items-to-decorate-bowers/

One way archaeologists learn how ancient people, including Neanderthals, did things is to attempt to do those things themselves, a process called experimental archaeology. Normally, that involves making stone tools, butchering deer, or distilling birch tar. But in a new study, it meant doing very destructive things to teeth from one of the world’s most carefully protected animals.

That’s because the archeologists suspected that Neanderthals once used rhino teeth as tools. By using the teeth to make stone tools, the researchers demonstrated that Neanderthals probably did the same thing, adding to what we know about the wide range of items in their toolkits.

We need to hit some rhino teeth with rocks for science

Some Neanderthal archaeological sites in Europe and Asia seem to have many more rhinoceros teeth lying around than you’d expect. We know Neanderthals hunted a now-extinct species of rhinoceros in Europe and eastern Asia, but the people who had inhabited these sites looked like they had been collecting rhino teeth for some reason.

Depending on the species, a rhinoceros has more than 260 bones but only 24 to 34 teeth. Yet at the 300,000-130,000-year-old cave site of Panxian Dadong in southern China, 74 percent of the rhino remains are teeth, not bones. And teeth make up 91 percent of the rhino fossils at Payre, a rock shelter in southeast France.

Many of those teeth had markings that looked suspiciously like what you’d get from using a piece of bone as a hammer: groupings of shallow pits and overlapping cracks, “produced by the accumulation of blows in the same zone.” There are also thin, shallow scratches from hitting the jagged edge of a stone tool.

To explore whether the markings really were the product of human tool-making and use, though, University of Aberdeen archaeologist Alicia Sanz-Royo and her colleagues needed something to compare them to. Which meant they needed to try their own bone-knapping on actual rhino teeth. But since rhinos are at best a threatened species and trade in rhino parts is heavily regulated under international law, getting those teeth was not easy.

https://arstechnica.com/science/2026/06/experiments-reveal-that-neanderthals-used-rhino-teeth-as-hammers/

By early March, a government program director was telling UCAR that he needed to “get this done quickly” and that documentation of the supercomputing center needed to be handed over “yesterday.” Even now, months after the deadline for public feedback on the decision, the government admits it hasn’t fully evaluated the comments it received. “The sequence of events strongly suggests that the outcome was predetermined,” the decision notes.

For all of those reasons, he concluded that the NSF had already reached a final decision on the transfer of the supercomputing center, and that decision was subject to review under the Administrative Procedures Act, which is what the rest of the case hinged on.

Blocked

As in so many other cases that have made their way into the courts, the government does not seem to have been prepared to offer much of a defense of its actions. The Administrative Procedures Act prohibits actions that are “arbitrary and capricious,” and Jackson found that there was a “failure to articulate any rationale” for the decision to relieve UCAR of its management role.

He noted that some internal documents introduced as evidence indicated that there was dissatisfaction with NCAR’s pursuit of climate research and hosting of scientific programs intended to improve minority participation. But the government chose not to use those as arguments, so the court didn’t need to evaluate them. UCAR, in contrast, introduced significant evidence that the decision to harm NCAR was part of a range of measures meant to pressure Colorado’s Democratic governor about an unrelated matter.

Given that, the court concluded that forcing UCAR to give up its supercomputing center was arbitrary and capricious, and thus violated the Administrative Procedures Act.

UCAR was also able to demonstrate that it was suffering irreparable harm due to the uncertainty about its future. It has experienced unusually high levels of attrition among its staff, who have a rare set of technical skills and require additional training after hiring. And it expects it will be difficult to find replacements for them.

Given those circumstances, Jackson has issued an injunction blocking the government from forcing NCAR or UCAR to give up any resources related to the supercomputing center.

There are still additional threats to NCAR, including breaking it up, transferring other resources, and even selling its Boulder headquarters. So, this victory is far from the end of the threats. But the legal issues that decided the case are likely to apply to the additional threats, unless the government has a defense that it simply chose not to present here.

https://arstechnica.com/science/2026/06/judge-blocks-part-of-trump-admins-effort-to-hurt-colorado-research-center/

They also conducted experiments that tracked people’s eye movements and recorded their brain activity as they viewed sets of images—both in the lab and in a gallery. There was more stable integrative brain processing when people looked at real art versus pseudo-art, and the eye movements mapped neatly onto the previously identified topological features, suggesting a link between topologically derived image features, eye movement, and aesthetic experience.

PLoS Computational Biology, 2026. DOI: 10.1371/journal.pcbi.1014156.

Political polarization is a phase transition

Credit: Complexity Science Hub (CSH)

It’s usually assumed that the candidate who spends the most has an electoral advantage, but physics suggests the reality is more complex. Scientists at the Complexity Science Hub (CSH) have found that political polarization behaves like a phase transition, according to a paper published in Physical Review Letters, marked by a critical campaign spending threshold. Below that threshold, social dynamics shape the outcome; exceeding that threshold deepens polarization without significantly increasing the margin of victory.

The CSH team used a statistical physics model to examine bipartisan elections, specifically 6,357 House races (with just two main candidates) spanning 435 congressional districts and 21 election cycles (1980 to 2020). They found that the tipping point is $1.8 million at the district level. (Senate and presidential campaigns have higher absolute spending.) When both parties spend less than that, community interactions shape the outcome. If just one party spends more than that, the campaign gains a decisive edge, drowning out the influence of community interactions. But if both campaigns exceed the threshold, both social influence and high spending become negligible.

Spending more and more doesn’t change the outcome, which usually falls into the 50:50 range. But it does significantly increase polarization. The authors found that the incumbency advantage is also very real, at least in the intermediate spending range. Any challenger must spend about $140,000 to unseat an incumbent, even if said incumbent spends nothing, given the baseline advantage. The scientists hope to extend their analysis to multi-party systems in European democracies to learn more about these dynamics.

https://arstechnica.com/science/2026/06/research-roundup-7-cool-science-stories-we-almost-missed-4/

For animals such as fish and insects that can’t control their body temperature, heat waves could be particularly detrimental. “Changes in air temperature will affect brain temperature,” says Baird. A hotter brain could hinder the functioning of nerves, and that, she says, “might affect sensing, memory, and learning.”

Cross section shows band of cells in the mouse hippocampus.

Credit: RAUNAK BASU / UNIVERSITY OF UTAH, SALT LAKE CITY

When Baird and colleagues tried to teach bumblebees to associate sweet sucrose with the color blue and bitter quinine with yellow, most of the bumblebees learned the trick at 77°, but fewer than half managed to do so at 90°. Such impaired cognition could spell trouble in the field: If the insects forget which flowers they should pollinate (in the case of bumblebees, these include tomatoes and blueberries) or how to get back home with nectar, not only will the pollinators suffer, but human agriculture too, Baird says.

Heat appears to dangerously diminish animal vigilance as well. In Ridley’s recent experiments, once mercury in the Kalahari Desert reached 96° F, pied babblers lost their ability to properly respond to predators. In their studies, researchers lured birds toward a mystery shape covered in a sandy-colored blanket, using worms as bait. Once a babbler approached, the scientists would reveal what was hidden underneath: either a taxidermied cat-like carnivore called a genet, or a similarly sized and colored wooden box. The birds got scared of the genet in cooler temperatures—they’d call out, scan their surroundings, or simply flee. But once it got hot, they behaved similarly whether they were facing the carnivore or the box. Ridley suggests that this could translate into higher chances of fatal predator attacks as heat rises, which could harm populations of babblers and other prey species.

These studies are not just abstractions. In the Kalahari, where southern pied babblers use their wits to search for worms, temperatures are rising twice as fast as the global average. In tropical rivers, where male guppies seek mates, heat waves are growing longer and more intense. It’s the same story across much of the planet—temperatures climb, and animal thinking becomes strained, potentially putting species at risk. The effects may be magnified in certain areas such as cities, which often exhibit even warmer temperatures than non-urban areas. If anything, Ridley says, “We are probably underestimating the impacts of increased heat on animal minds.”

This story originally appeared on Knowable Magazine. 

https://arstechnica.com/science/2026/05/they-call-it-stupid-hot-for-a-reason-heat-muddles-animal-brains/