A leaf-eared mouse living more than 6,700 meters (22,000 feet) above sea level in the Andes has shattered assumptions about where mammals can survive. Near the summit of an Andean volcano, where the air contains barely half as much oxygen as it does at sea level, scientists found something that should not have been there: [...]
Scientists say some of the traits that define modern humans may have evolved only after long-standing biological and cultural barriers were broken. Human evolution is often presented as a clear progression: brains grew larger, faces became smaller, tools improved, and our ancestors gradually became more like us. A new study suggests that this familiar story [...]Living nearly 900 meters underwater, this isopod evolved unusual adaptations to thrive in the world’s most food-scarce environment.
Welcome to this special star-spangled edition of The Intelligence Brief… In this installment, as America celebrates its 250th birthday amid record-breaking summer heat and mounting pressure on the nation’s power grid, we take a broader look at the technological revolutions that have shaped the United States—and the artificial intelligence revolution now poised to redefine its future. In our analysis, we’ll be looking at 1) how successive innovations transformed American society over the past two and a half centuries, 2) why artificial intelligence may represent the next great technological leap, 3) the extraordinary scientific opportunities AI is already creating alongside the risks and disruptions it presents, and 4) why the choices we make today about this transformative technology could help determine the course of America’s next 250 years.
“America was not built on fear. America was built on courage, on imagination, and an unbeatable determination to do the job at hand.”
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Depending on where you are at the time you’re reading this, you may have noticed the temperature. Safe to say, summer has arrived.
One reason involves the “heat dome” that is covering much of the East Coast and the Midwest, with temperatures topping 100 degrees across large portions of the U.S., including the nation’s capital. As a result, the country’s power system is undergoing inevitable strain as extreme heat warnings have prompted grid operators to warn about surges in air-conditioning use throughout the nation, with many systems expected to operate less than optimally amid such temperatures.
All of this arrives just in time for America’s 250th birthday, with Independence Day celebrations falling on a weekend that is certain to be memorable for more than just the extreme heat, since this year’s celebration marks our nation’s semiquincentennial.
“Reaching 250 years is a significant event for any nation,” read a statement by the Sandra Day O’Connor Institute in honor of the forthcoming holiday. “It offers a chance to learn more about how the United States began, how it grew, and how it has changed over time. Every era of American history has shaped the present in some way, from early settlements to westward expansion, from war and invention to civic achievements and cultural growth.”
Something else that this special Independence Day offers us is an opportunity to reflect on how successive technological revolutions have influenced our nation’s growth since its inception, and where the cutting-edge technologies of today are likely to carry us going forward.
We’ve come a long way since 1776. Back in the days during which the Declaration of Independence was signed, the speed of information was constrained to how fast a horse could carry its rider, or how strong the winds were that could propel a ship across water.
Under such conditions, pens and ink were used to preserve ideas on paper that could take weeks to make its way from locations like Philadelphia to other parts of the colonies. With such technological limitations, human political organization was similarly constrained.
Over the last two and a half centuries, we have seen most of those limitations fall away, with new inventions advancing progress, and eventually being overtaken by even newer, bolder ideas and inventions. Our steam engines helped remove geographic constraints, only to be replaced by aircraft, automobiles, and conveyances propelled by electrical power.
Similarly, the telegraph helped collapse the imposition of time that once hindered communication; its successors, like radio, the telephone, the Internet, Smartphones, and a host of other mobile communications technologies, have now placed instantaneous global communication at our fingertips.
And now we are on the cusp of another great American technological transition: one that very likely will rival any that came before it.
It is difficult to even compare artificial intelligence to any other potentially revolution-inducing technology in our nation’s history. As America turns 250 and we look back on the progress that has brought us to the present day, one must also wonder how history will look back on the advent of this technology: will we recognize the implementation of AI as another innovation that breaks significant barriers that constrained human achievement, as time and geography once did?
Or will the advent of AI be remembered differently? Science fiction affords us alternative scenarios that most of us are quite familiar with already, and the real possibility that AI could spell trouble for us in the years ahead remains ever-present. Where things go from here, understandably, has a lot to do with the question of what humans choose to use this technology for, and how we go about implementing it.
Yes, scientific progress is accelerating, and AI is helping with that. Discoveries are arriving faster not only because scientists are working harder, but because the tools they’re using—especially AI—are helping them achieve more, and increasing our productivity and overall capability to levels that dramatically exceed what humans alone can do.
From the design of new proteins in the lab and the identification of obscure exoplanets within mountains of astronomical data, to the acceleration of materials science and a range of other fields, much of what we are seeing AI help us achieve right now bears the promise of a brighter future. But should that hopeful vision for a better future be taken for granted?
There are obvious reasons for caution, since virtually every major technological revolution brings not only opportunities, but also disruption. New sources of technology replace old ones, and thereby require new skills to be leveraged. The result of this obsolescence often extends to those in the workforce whose expertise once propelled these predecessor technologies; once the technologies have fallen out of use (sometimes with remarkable speed), the human workers once tasked with building them are left having to find new professions.
Myriad examples of similar past technological scenarios exist that encourage such concerns. Nuclear physics gave us clean energy, but also nuclear weapons; the internet connected billions of people—and each day, it enables the spread of misinformation into our homes, along with the potential for unwarranted surveillance and cybercrime.
AI will almost certainly follow a similar pattern to every other major technological revolution that America, and the world at large, has ever seen. So the question isn’t one of whether it will change our society: we already know the answer to that.
The question here has more to do with how we will use this technology, and what we will allow it to do for us—and to us—as it progresses.
To conclude on a somewhat odd, yet also an extremely relevant note in the context of what we’re discussing here, some interesting exchanges aired recently on CNBC’s “Squawk Box,” during a live segment featuring Palantir CEO Alex Karp.
Anyone who watches this will understand both the relevance, as well as my choice in characterizing it as “odd,” given the strange, rambling nature of Karp’s interview (admittedly, some have been a bit less gracious in how they’ve characterized the recent appearance).
Rather than discussing Palantir and Nvidia’s recent work for the United States government in assembling its new AI infrastructure, Karp appeared to have something else on his mind: the looming prospect of a financial bubble underlying the current boom in AI technology.
“Something has gone completely wrong,” Karp said at one point during one of the rambling exchanges, where he appeared to be addressing the token model currently employed by leading AI companies amid rising costs, as industry leaders continue to seek returns on investment.
“The basic view among enterprises in this country is I’m going to chillax and waste my time with tokens,” Karp said. In another portion of the diatribe, Karp aired his concerns about how current AI models have been “irresponsibly” oversold, which he called “dangerous for everyone, which is why I can give [AI] to all your adversaries but I can’t give it to the Department of War, or I can’t safely give it to an enterprise in this country, without being certain that the Alpha of that business could transfer to this model tomorrow, i.e. I have no business, no job.”
When chided by host Becky Quick for sounding angry, Karp shot back that “This is the voice of American business that is being channeled through me.”
“Are we really going to outsource the battlefield of this country to the consensus view in Silicon Valley?” Karp also said at one point. “That is effing insane.” The entire segment can be watched here.
Although Karp’s interview was odd, to say the least, the Palantir CEO raises some important points, and as evidenced by his demeanor during the CNBC segment, much of what he discussed appears to be weighing heavily on him.
It would be safe to say that he’s probably not the only one in Silicon Valley right now experiencing a degree of unrest and uncertainty over such issues, as the current situation with AI technologies in America and around the world progresses onward into uncertain territory.
Fortunately, America’s history shows that a major driving factor in its progress has been the conviction that the next horizon is worth pursuing, even when it’s uncertain.
Yes, the unforeseeable consequences of these nascent technologies, like AI, can be sobering at times. While it seems inevitable that the same driving forces that have driven past industrial revolutions will also drive humans to build smarter, and increasingly more powerful machines, hopefully, we will also remember that wisdom is required in knowing how to use them.
If we can do that, then perhaps America’s progress can continue for another 250 years, and the technologies we are innovating in the present day can indeed help us to build a brighter future for tomorrow.
That concludes this week’s installment of The Intelligence Brief. You can read past editions of our newsletter at our website, or if you found this installment online, don’t forget to subscribe and get future email editions from us here. Also, if you have a tip or other information you’d like to send along directly to me, you can email me at micah [@] thedebrief [dot] org, or reach me on X: @MicahHanks.
Here are the top stories we’re covering right now…
For decades, paleoanthropologists have largely agreed that somewhere along the evolutionary course from apelike ancestors to modern humans, our bodies got dramatically larger. However, one lingering mystery has been when this intense growth began.
Did our ancestors gradually grow bigger over millions of years? Did the shift coincide with the emergence of the genus Homo? Or did it occur later, after some of the earliest human species had already appeared?
A new study published in the Proceedings of the National Academy of Sciences (PNAS) argues that the answer is more complex than any single theory has suggested.
Rather than supporting a single long-standing hypothesis, researchers used a sophisticated statistical method to show that human body size likely followed two evolutionary courses simultaneously: a slow, steady increase spanning millions of years, punctuated by a much larger leap in later members of the genus Homo.
The findings help reconcile decades of conflicting research while offering one of the clearest pictures yet of how, and perhaps why, our ancestors evolved into larger-bodied humans.
“Despite its central role in hominin evolution, there is little consensus on how body size increased through time,” researchers write. “We provide strong evidence for a marked size increase in later-occurring Homo, alongside a moderate general increase over time among all hominins.”
Body size is one of the defining characteristics of an organism. In humans and our extinct relatives, it has been linked to everything from brain expansion and walking efficiency to metabolism, hunting behavior, and the ability to travel across increasingly large landscapes. Understanding when body size changed, therefore, helps researchers reconstruct not only what our ancestors looked like, but how they lived.
Yet despite decades of fossil findings, scientists have struggled to agree on the evolutionary pattern behind those changes.
Some previous studies suggested that hominins simply became larger over time. Some contended that body size remained relatively stable until the emergence of Homo. Still others have proposed that the real transformation arose only after early species such as Homo habilis, often regarded as one of the first members of our genus.
According to researchers, one reason for the disagreement is that earlier analyses typically examined these competing ideas independently. They also often failed to account for uncertainties inherent in the fossil record, including disagreements over species classification, differences in body mass estimation methods, and uncertainties in evolutionary relationships among fossil species.
To address those limitations, researchers compiled one of the largest hominin body-size datasets assembled to date, incorporating body mass assessments from 386 fossil specimens representing 21 different taxa.
They then analyzed the data using Bayesian phylogenetic generalized linear mixed models—a statistical approach that accounts for evolutionary relationships while encompassing multiple layers of uncertainty.
The team repeated its analyses across 1,000 different phylogenetic trees and 1,000 separate datasets, allowing them to test whether the overall pattern remained consistent despite uncertainties.
The results pointed to two simultaneous trends.
The first was a modest but persistent increase in body size across the hominin family as a whole. On average, body mass increased by roughly 2 pounds (0.9 kilograms) every million years, suggesting that larger bodies gradually became more common throughout human evolution.
However, the second trend proved far more dramatic.
Instead of all members of Homo becoming substantially larger, the researchers found the strongest evidence for a distinct jump in body size among later members of the genus, particularly species that appeared after Homo habilis. That pattern regularly emerged regardless of how the fossil data were analyzed.
In other words, early members of Homo may not have represented the major biological turning point scientists once assumed.
This finding disputes a common assumption that simply belonging to the genus Homo meant possessing a significantly larger body. Instead, the study suggests that some hallmark features traditionally associated with humans, including larger body size, may have evolved after the genus’s origin.
That interpretation also corresponds to broader changes that occurred later in human evolution.
Researchers note that this period coincides with evidence for more efficient upright walking, greater reliance on meat consumption, and expanding home ranges. Larger bodies may have been both a consequence of and a contributor to those behavioral and ecological shifts.
The study likewise reinforces another growing theme that evolution rarely follows a straight line.
Species such as Homo floresiensis, often nicknamed the “Hobbit” because of its diminutive stature, and Homo Naledi frequently appeared as outliers with unusually small body sizes despite belonging to relatively recent branches of the human family tree. Their existence demonstrates that body size did not simply increase in a uniform march toward modern humans.
Instead, evolution repeatedly experimented with different solutions depending on local environments and ecological constraints.
The researchers also argue that part of the longstanding disagreement over body-size evolution stems from the fossil record itself. Different studies have estimated fossil body masses using different skeletal elements, comparison populations, and statistical techniques, sometimes producing substantially different results for the same individual.
By expressly incorporating those uncertainties into their analysis, rather than treating them as fixed values, the new framework seeks to capture the range of plausible evolutionary scenarios rather than relying on a single interpretation.
Even so, researchers caution that important questions remain unresolved.
Improved fossil discoveries, more accurate body-mass estimation methods, and a better understanding of species relationships could all further refine the picture. The study also does not explicitly account for sexual size differences between males and females, which may have been greater in some early hominin species than in modern humans.
Nevertheless, the wider conclusion is intriguing.
Rather than choosing between competing theories, the evidence suggests both contain elements of the truth.
Body size did increase gradually across the hominin lineage. But the most considerable leap appears to have occurred later, after the earliest representatives of Homo had already evolved.
That conclusion may help settle one of paleoanthropology’s longest-running debates while showing how advances in statistical methods are transforming scientists’ ability to extract new insights from fossils that have often been studied for decades.
“Overall, these findings bring clarity to a fundamental question in human evolution and show how the application of rigorous phylogenetic comparative tools can unlock patterns previously hidden in the fossil record while accounting for multiple sources of uncertainty,” researchers write. “By reconciling conflicting findings within a single framework, our results clarify key evolutionary transitions and highlight the complex nature of body size change in human evolution.”
Tim McMillan is a retired law enforcement executive, investigative reporter and co-founder of The Debrief. His writing typically focuses on defense, national security, the Intelligence Community and topics related to psychology. You can follow Tim on Twitter: @LtTimMcMillan. Tim can be reached by email: tim@thedebrief.org or through encrypted email: LtTimMcMillan@protonmail.com
The story of Earth’s first animals may need rewriting after ancient fossils revealed an earlier start to complex life. From butterflies to blue whales, corals, and worms, Earth is home to an incredible diversity of animals. How all of these animals evolved from earlier, simpler ancestors is one of the most exciting stories in the [...]A deep ocean whale graveyard is revealing new clues about whale evolution and the ecosystems that form around their remains. When a whale dies, its body can become the beginning of an entire deep ocean ecosystem. For a time, the carcass may drift at the surface, drawing sharks and other predators. Eventually, after weathering and [...]Researchers have extracted DNA from a 50,000-year-old tooth belonging to an African antelope, setting a record for the oldest DNA ever retrieved from sub-Saharan Africa, a new study reports.
The finding suggests that DNA preservation in sub-Saharan Africa is possible for tens of thousands of years. In most cases, the region's hot climate breaks down the molecule and prevents researchers from understanding the evolution of numerous species, including ancient human ancestors and relatives.
While some temperate regions are known for preserving ancient human DNA — for instance, the Sima de los Huesos ("Pit of Bones") in Spain preserved DNA from a mysterious relative of modern humans that lived around 400,000 years ago — the sub-Saharan African climate is less forgiving. The oldest human DNA from sub-Saharan Africa is about 18,000 years old and was discovered in bones found in a rock shelter in Tanzania. And the oldest sub-Saharan animal DNA is just 9,300 years old, from an extinct antelope in South Africa.
In the new study, researchers tested whether DNA could be successfully extracted from ancient skeletons even older than that. By analyzing more than 300 teeth from animals that lived in the past 110,000 years, they discovered that small amounts of DNA could be identified even in remains from the Late Pleistocene, the latter part of the last ice age.
In a study published online May 27 in the journal Quaternary Science Reviews, researchers extracted DNA from dozens of Holocene bovid specimens younger than 11,700 years old and from four Late Pleistocene bovid specimens between 12,000 and 50,000 years old. Although many of the teeth didn't yield DNA, a handful did. The oldest DNA the researchers found came from a partial molar from an African antelope called a mountain reedbuck (Redunca fulvorufula) discovered in Boomplaas Cave in southern South Africa. The other old DNA samples came from three extinct long-horned buffalos (Syncerus antiquus) — two that died 21,000 years ago and one that died 12,000 years ago.
"The 50,000-year-old DNA is exciting," study first author Deon de Jager, a paleogenomics expert at the University of Copenhagen, told Live Science in an email. "But I am myself skeptical of it, for two reasons."
The reedbuck DNA is significantly older than the next-oldest DNA the researchers retrieved, from the long-horned buffalo, de Jager explained, and the reedbuck specimen was contaminated with some human DNA, which they were able to remove. These two issues mean the 50,000-year-old antelope DNA result is not ironclad. However, since the publication of the study, the researchers have also sequenced the genome of a 42,000-year-old wildebeest from Ethiopia, suggesting DNA lasts a lot longer in Africa's climate than experts once thought.
"There is of course a limit to DNA preservation in Africa, but what it is, is not clear," de Jager said. "There are certainly parts of Africa where DNA will be preserved even better than from the sites we have surveyed. Deep caves with stable, low temperatures will certainly be good candidates, but also high-elevation sites where temperatures have been very low for a long time."
The Late Pleistocene teeth that de Jager and colleagues analyzed produced very low amounts of DNA, which is thought to have a half-life of about 521 years, meaning half of the DNA in a specimen disappears every 521 years until none is left. But the amount the researchers found is still useful, de Jager said.
The DNA is sufficient for identifying evolutionary lineages, de Jager added. If they can gather enough data, researchers might be able to compare gene flow and interbreeding among species and populations.
Although these results suggest that DNA analysis is possible for understanding the past 40,000 to 50,000 years of animal and human evolution in South Africa, we may never be able to extract DNA from ancient human relatives like Homo naledi, which went extinct around 240,000 years ago, or Paranthropus robustus, which died out around 1 million years ago.
"I think the chances of obtaining DNA from Homo naledi are very, very low, unfortunately," de Jager said. "One would have to get very lucky with an incredibly well-preserved skull with the petrous bone still present, which is the best bone for obtaining ancient DNA. To get DNA from something in Africa nearly 1 million years old would probably be impossible, as the conditions in Africa are just too harsh."
How much do you know about Earth's frosty past? Find out with our last ice age quiz!
The discovery offers one of the oldest known examples of interpersonal violence.
Today, lepidosaurs -- the reptile group that includes lizards, snakes and New Zealand’s tuatara -- are among the most diverse vertebrates on Earth, but their earliest evolutionary history remains poorly understood.
The post Tiny Triassic Reptile Sheds Light on Early Lizard Evolution appeared first on Sci.News: Breaking Science News.
Until about 60,000 years ago, diminutive hominin cousins, Homo floresiensis (affectionately nicknamed Hobbits for obvious reasons), shared the island of Flores with Komodo dragons, pygmy elephants, and giant rats.
Based on the presence of hominin and pygmy elephant bones in the same layers of cave sediment, it originally looked like the Hobbits had hunted and butchered dwarf elephants—an impressive feat for such a tiny hominin. But according to University of Tübingen anthropologist Elizabeth Veatch and her colleagues, it was the Komodo dragons that were the hunters, while the Hobbits only showed up to scavenge what was left.
If Veatch and her colleagues are right, their findings may challenge some of the assumptions we’ve made about Homo floresiensis—and about which hominin species was the first to venture into the wider world beyond Africa.
© Zoo Atlanta
Around 100,000 years ago, an early Homo sapiens man was probably stabbed in the face with a sharp stone tool and later buried in a cave in what is now Israel, archaeologists have determined. The Stone Age cold case appears to be the earliest evidence of this kind of interpersonal violence, according to the research team.
In a study published June 30 in the journal Scientific Reports, the international team of researchers closely examined the skull and lower jaw of a person who was deliberately buried in Qafzeh cave in Israel during the Middle Paleolithic period.
At least 27 people were buried in Qafzeh cave between about 145,000 and 92,000 years ago, making them some of the earliest members of our species to be found outside Africa. Previous analysis of the skeletons, which were excavated between the 1930s and 1970s, revealed that two people had head injuries resulting from blunt trauma.
But the new analysis, which employed microscopic and micro-CT scanning techniques, revealed that Qafzeh 25, an adult male, had a cut mark across his lower left jaw that affected one of his bicuspids and part of his upper jaw. The jawbone showed signs of healing, suggesting that the man lived for a significant amount of time after being injured, the researchers wrote in the study.
Archaeologists had previously identified only a few cases of trauma caused by sharp weapons or projectiles in Middle Paleolithic skeletons. Although these injuries could have resulted from hunting accidents, the researchers wrote, they have generally been interpreted as evidence of interpersonal violence.
The cut mark on the jaw of Qafzeh 25 was found on the left side of his face, lending further support to the idea that the injury was not an accident.
It's not clear what kind of tool made the cut mark, but stone tools found at Qafzeh included flint scrapers and sharp points that could have been fashioned into spear tips.
"Forensic studies of modern human populations have reported that craniofacial injuries resulting from blows are more frequently observed on the left side of the skull, a distribution commonly attributed to the predominance of right-handed assailants in face-to-face confrontations," the researchers wrote.
If the researchers' interpretation of the cut mark is correct, it "would represent the earliest documented case of sharp force trauma in the archaeological record," they wrote.
Qafzeh cave is already well known within archaeology for its clear evidence that early humans buried their dead. The new discovery confirms that the earliest human groups left Africa with a complex culture.
"These results provide new data to the debate on the origin of complex behaviors such as interpersonal violence, the care of injured or sick individuals and funeral practices," study first author Ana Pantoja Pérez, a paleoanthropologist at Spain's National Research Center for Human Evolution, said in a statement.
See how much you know about early humans with our human evolution quiz!
Editor’s Note: Astrobites is a graduate-student-run organization that digests astrophysical literature for undergraduate students. As part of the partnership between the AAS and astrobites, we occasionally repost astrobites content here at AAS Nova. We hope you enjoy this post from astrobites; the original can be viewed at astrobites.org.
Title: MAGAZ3NE: Confirming Dust Deficiency and Quiescent Nature of Ultramassive Galaxies at 3 < z < 4 with ALMA Observations
Authors: Wenjun Chang et al.
First Author’s Institution: University of California, Riverside
Status: Published in ApJ
Distant galaxies offer a unique window into how stars, gas, and dust evolve over cosmic time. Tracing this evolution requires understanding not only how galaxies form, but also how and when they stop forming stars, a process known as quenching. Understanding how, when, and why galaxies quench is a fundamental question in astrophysics, and one that requires observations of star-forming, quenching, and fully quenched galaxies alike. Unfortunately, one complication is that identifying truly quenched galaxies is challenging: galaxies that appear “dead” may instead be actively forming stars, hidden behind a thick veil of dust.
In today’s article, the authors use observations from the Atacama Large Millimetre/submillimetre Array (ALMA) to investigate five ultramassive galaxies at redshifts, z, between 3 and 4, and ask a deceptively simple question: are these massive red galaxies genuinely quenched, or are they secretly forming stars behind the scenes?
The five galaxies in this study are drawn from the Massive Ancient Galaxies at z > 3 NEar-infrared (MAGAZ3NE) survey, which targets some of the most massive galaxies known at early cosmic times. All five have stellar masses exceeding 100 billion solar masses and have been confirmed at z > 3. At these redshifts, we are observing the galaxies as they were when the universe was less than 2 billion years old. This is just before an epoch known as cosmic noon, when star formation across the universe reached its peak.
These galaxies also benefit from extensive multiwavelength observations from a range of observatories, including the ground-based Visible and Infrared Survey Telescope for Astronomy and the Spitzer Space Telescope. By combining imaging across wavelengths from the ultraviolet to the near-infrared, astronomers can measure the “colours” of galaxies and use these colours to infer the galaxies’ star-forming activity.
Galaxies that have quenched their star formation are dominated by older stellar populations, which makes them appear red (hence why they are often referred to as “red and dead” galaxies). However, dust can redden galaxies in a similar way by absorbing blue light and re-emitting it at longer wavelengths — meaning that a dusty, star-forming galaxy can easily masquerade as a quenched one. To uncover any hidden star formation, the authors turn to ALMA to search for far-infrared dust emission. The sample of galaxies investigated with ALMA is shown in Figure 1.
Figure 1: UVJ colour–colour diagram, which uses galaxy colours in the ultraviolet (U), visible (V), and near-infrared (J) to identify quenched galaxies. The five ultramassive galaxies (UMGs) studied here (filled cyan circles) lie firmly in the quenched region (QG), consistent with a lack of ongoing star formation. Crosses indicate galaxies undetected in ALMA dust emission, while other massive galaxies at similar redshifts are shown in grey for comparison. [Chang et al. 2026]
ALMA observes light at sub-millimetre wavelengths, which at these redshifts traces emission from star-forming regions that are obscured by dust. Of the five ultramassive galaxies in this sample, only one is detected with ALMA. Even when the remaining four galaxies are stacked together, no dust emission is recovered, indicating that if any dust is present, it must be extremely faint.
To better quantify what these ALMA non-detections imply, the authors perform spectral energy distribution fitting (see a recent overview bite on spectral energy distribution fitting) using the Code Investigating GALaxy Emission, or CIGALE, a code that enforces energy balance between absorbed starlight and dust emission to estimate physical properties such as a galaxy’s star formation rate and dust content. With the ALMA constraints included, all five galaxies are found to lie more than 10 times below the star-forming main sequence. Even the single ALMA-detected galaxy remains formally quenched, showing only weak residual star formation.
In other words, these galaxies really are dead (or at least extremely dormant).
The spectral energy distribution fitting also allows the authors to measure how much dust these galaxies contain relative to their stellar mass. This ratio provides a simple but powerful way to assess how much interstellar material remains in a galaxy — and therefore how much fuel is left for future star formation.
Three of the five ultramassive galaxies have ratios of Mdust/Mstar < 10-4 (Figure 2), placing them among the most dust-poor quenched galaxies confirmed at z > 3. The lone galaxy detected by ALMA contains slightly more dust, with Mdust/Mstar = 10-3, but even this is far below what would be expected for an actively star-forming galaxy. For comparison, typical star-forming galaxies at similar stellar masses host more than 100 times more dust.
Figure 2: The ratio of dust mass to stellar mass versus redshift for massive quenched galaxies (QGs). This quantity measures how dust rich a galaxy is compared to its stellar mass. The ultramassive galaxies in this study (cyan pentagons) fall well below the dust content expected for star-forming galaxies (solid blue line), highlighting their extreme dust deficiency. [Adapted from Chang et al. 2026]
For now, ALMA has delivered a clear answer to the question of “dead or in disguise?”: at least some candidate ultramassive galaxies in the early universe really are quenched, and they are strikingly dust poor. By ruling out the dusty impostor scenario, this study shows that deep ALMA observations can cleanly distinguish genuinely quenched galaxies from dusty star-forming ones, even at the highest stellar masses and earliest cosmic times. How these galaxies lost their dust remains an open question, but one thing is clear: by the time cosmic noon arrived, some galaxies had already finished forming stars and quietly faded into dormancy.
Original astrobite edited by Viviana Cáceres.
About the author, Lucie Rowland:
I’m a fourth (and final!) year PhD student at Leiden Observatory in the Netherlands, studying massive, star forming galaxies in the early universe with ALMA and JWST. It’s a really exciting time to be interested in astronomy, so I hope to make groundbreaking new research more accessible!
The post Distant Galaxies: Dead or in Disguise? appeared first on AAS Nova.
Stellar rotation is a crucial aspect of not only stellar evolution but also exoplanet science, and a recent study has built the largest catalog of stellar rotation periods to date.
Since its launch in 2018, the Transiting Exoplanet Survey Satellite (TESS) has scoured the sky, searching for the signature recurring dip in starlight caused by planetary companions. While the primary goal of TESS is to discover exoplanets, the satellite’s mapping of the entire sky has created a rich database of high-quality photometry for millions of stars. These observations offer ample opportunity for scientists to study stellar properties and behavior across the Milky Way.
In particular, stellar rotation is a key property that traces a star’s age, magnetic activity, and internal structure. For exoplanet science, stellar rotation is both a help and a hindrance: it allows us to study how exoplanets may evolve over time with their host stars, but stellar activity can mimic or drown out planet signals, making them harder to detect. A few studies have investigated stellar rotation periods with TESS, looking at specific star clusters and known planet hosts. To date, however, no existing study has produced a larger catalog of TESS rotation periods — a product that would provide a wealth of information for both exoplanet and stellar evolution science.
Target sample summary showing the TESS sky coverage (top left), histogram of number of TESS observations per star (top right), TESS magnitude as a function of distance to the star (bottom left), and histograms of magnitude, distance, temperature, and color across the sample (bottom right). Click to enlarge. [Boyle et al 2026]
Not all brightness variations present in a star’s light curve are due to stellar variability — instrumental systematics and artifacts from the spacecraft’s orbital period can produce periodic variability. To combat this, the authors created a classification algorithm to select sources whose periodicity is most likely due to true stellar variability rather than instrumental or observational effects. Pairing this classification with some additional validation criteria, the authors built the TESS All-Sky Rotation Survey (TARS), a catalog of periods for 1,046,317 stars within about 1,600 light-years of our Sun.
Map of all TARS stars within about 1,600 light-years of the Sun (left) and only the fast-rotating stars in the survey, highlighting clustered populations (right). Click to enlarge. [Boyle et al 2026]
Looking more finely at the TARS catalog, the authors provided additional quality cuts to remove other potential sources of stellar variability like binary companions or pulsations. The authors estimated that roughly 93% of their measured periods are due to stellar rotation, which expands the number of stars with known rotation periods by a factor of 2.3 within about 325 light-years and by a factor of 4.0 within about 1,600 light-years. As the largest homogeneous catalog of stellar rotation periods to date, TARS lays the groundwork for studies of stellar evolution, exoplanet discovery and evolution, and even Milky Way structure. For example, the authors found that when mapping the fast-rotating, typically younger stars in TARS, the location of young stellar associations in the local neighborhood became significantly clearer. This underscores the importance of this catalog for a range of science goals, and future work will only improve upon the data provided by TARS.
“The TESS All-Sky Rotation Survey: Periods for 1,046,317 Stars within 500 pc,” Andrew W. Boyle et al 2026 ApJS 284 75. doi:10.3847/1538-4365/ae6657
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Human laughter may hold a deeper connection to our primate ancestors than previously realized, preserving a 15-million-year-old evolutionary legacy. New research from the University of Warwick suggests the rhythm of laughter has remained largely unchanged across millions of years, offering surprising new insights into the origins of human speech.
Great apes are humanity’s closest living relatives, and species including chimpanzees, bonobos, gorillas, and orangutans all produce laughter-like vocalizations accompanied by smile-like facial expressions.
For years, scientists have wondered whether these vocal expressions share a common evolutionary origin. To investigate, researchers analyzed laughter recordings from 17 apes and humans representing five species: four orangutans, two gorillas, three bonobos, four chimpanzees, and four humans. Examining 140 laughter sequences, they found that every species produced laughter with evenly spaced rhythmic intervals between sounds—a pattern that appears to have been inherited from a common ancestor.
“It is impossible to assess the precursor forms of language directly from our extinct ancestors,” said Dr Adriano Lameria, an Associate Professor with the Department of Psychology at the University of Warwick and a researcher with its ApeTank, said in a statement. “Laughter, being evolutionarily older and having remained shared between all living great apes, provides a rare evolutionary window into the vocal transformations that unfolded across hominid evolution until the first humans appeared on scene.”
“Contrary to the classic notion that the first humans suddenly acquired vocal control capacities remarkably different from their predecessors, laughter evolution tells us that humans lay on a continuum, a prolongation of vocal control capacities that were already being cumulatively honed in for 15 million years,” Lameria added.
The discovery suggests that this rhythmic connection and foundation of laughter was already present around 15 million years ago and has persisted through millions of years of evolutionary change.
“How did humans evolve the remarkable ability to speak? Speech leaves no fossils, and complex language exists only in our own species. But we’ve found a 15-million-year-old clue in an unexpected place: our laughter,” said Dr. Chiara De Gregorio, Honorary Research Associate, Department of Psychology, University of Warwick.
“Unlike speech, laughter is shared by all living great apes. By comparing how different species laugh, we can see that a basic rhythmic structure has remained unchanged since our last common ancestor. That’s extraordinary,” De Gregorio added.
Even though humans and apes share similarities—with ape vocalizations generally having a deeper resonance and tone—the underlying timing of laughter has remained remarkably stable over millions of years. What distinguishes humans is our greater voluntary control over laughter, allowing us to laugh intentionally in social situations in ways that our primate relatives cannot.
Scientists believe this increased vocal control may have played a key role in the evolution of speech. The human ability to precisely regulate vocal timing, tone, and expression is considered a fundamental component of producing complex spoken language.
The new findings challenge the idea that humans suddenly developed advanced speech abilities unlike those of earlier species. Instead, the research suggests that human communication evolved gradually, building upon vocal capacities that had already been developing in our ancient primate relatives.
Chrissy Newton is a PR professional and the founder of VOCAB Communications. She currently appears on The Discovery Channel and Max and hosts the Rebelliously Curious podcast, which can be found on YouTube and on all audio podcast streaming platforms. Follow her on X: @ChrissyNewton, Instagram: @BeingChrissyNewton, and chrissynewton.com. To contact Chrissy with a story, please email chrissy @ thedebrief.org.
A butterfly that survives for nearly a year, while its closest relatives live only two weeks, offers a potential model for studying how aging and lifespan can evolve in nature.
A University of Bristol-led study published in Nature Communications reports that some Heliconius butterflies have evolved both longer lifespans and slower physical decline, distinguishing them from most other butterfly species studied to date.
Heliconius butterflies inhabit the rainforests of Central and South America, where most adult butterflies live only a few weeks. In the study, Heliconius hewitsoni reached a maximum lifespan of 348 days, while a related species, Dione juno, only survived about 14 days under observed conditions. This represents a 25-fold difference in maximum lifespan between two closely related species.
Heliconius butterflies not only live longer than their relatives, but also show slower physical decline with age. The team, in collaboration with the Smithsonian Tropical Research Institute in Panama, measured grip strength in aging butterflies to assess physical decline. Older Heliconius hecale performed as well as the younger individuals tested, showing no detectable age-related decline in grip strength.
The team combined butterfly house data, mark–recapture field studies, and controlled lab experiments. In these cases, Heliconius butterflies consistently showed longer lifespans, lower mortality rates, and slower rates of aging than closely related species that do not feed on pollen.
One hypothesis for their extended lifespan focuses on their unusual adult diet. While most butterflies feed only on nectar, Heliconius also consumes pollen, which was thought to provide the nutritional basis for its extended lifespan.
To test this idea, researchers compared pollen-feeding Heliconius hecale with its non-pollen-feeding relative, Dryas iulia. H. hecale maintained body mass and muscle performance longer than D. iulia. Even without pollen in its diet, H. hecale still outlived its relative by a wide margin. This suggests that diet alone does not explain Heliconius’s extended lifespan.
Dr. Jessica Foley, the study’s lead author from the University of Bristol’s School of Biological Sciences, explained that insects already show a huge range of lifespans. Some, like mayflies, live only a few days, while ant and termite queens can survive for decades. “This represents a roughly 5,000-fold difference within the class, compared with around a 100-fold difference in lifespan observed in mammals.”
Heliconius butterflies are notable because they have evolved both longer lifespans and slower rates of aging, allowing them to outlive close relatives from which they diverged only recently in evolutionary history.
Most aging research uses a limited set of laboratory organisms, such as mice, worms, and fruit flies, to study biological aging mechanisms. The heliconius butterfly provides a unique opportunity to study a long-lived species closely related to short-lived species, allowing for direct comparison in a natural context. Foley noted that comparing these two groups “can help reveal how lifespan is extended, making them a highly promising new model for research into the biology of aging and longevity.”
If pollen feeding and longevity evolved together but are not entirely dependent on each other, the next step is to identify the genetic and physiological changes responsible for both traits. Understanding these mechanisms in Heliconius butterflies could provide insight into how aging evolves across species.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds an MBA, a Bachelor of Science in Business Administration, and a data analytics certification. His work focuses on breaking scientific developments, with an emphasis on emerging biology, cognitive neuroscience, and archaeological discoveries.
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