Thursday, 13 August 2026

Metal From Beyond Our World Found in Rings Worn by Ancient Mediterranean Elites

13 Aug. 2026, By I. Farkas

Some of the items that likely incorporated iron from meteorites.
 (Gounelle & Mantzourani, J. Archaeol. Sci., 2026)

Despite their association with planet-pulverizing destruction and extinction, space rocks can be a cosmic gift.

The meteorites that are too puny to blow up our Earth provide insights into wholly alien environments, including those that are far older than the solar system.

Meteorites may have been even more precious millennia ago, both symbolically and as a much-appreciated source of iron for pre-Iron Age societies.

These include the legendarily influential pre-Greeks, like the Minoans of Minotaur-ian fame and Mycenaeans of the Iliad and Odyssey, who brandished flashy rings made from meteorites to assert their prominence and power, a recent study published in the Journal of Archaeological Science suggests.


The 33 archaeological sites where the analyzed items were excavated. Numbers in red indicate where nickel was found in the items, indicating meteorites.
 (Gounelle & Mantzourani, J. Archaeol. Sci., 2026)



Throughout history, people around the world crafted meteorites into tools, weapons, and jewelry: scrapers in Greenland; axe-like votives in China; jewels in pre-Columbian America; auspicious talismans protected herders and their camels in Egypt, where King Tut's famously tantalizing space dagger continues to fascinate.

But Bronze Age Greece seems to lack these items.

So the researchers explored two overarching questions. First, did the Minoans and Mycenaeans also incorporate meteoritic iron into their diverse, craftily created implements? Second, when did these mighty metallurgical workers begin smelting iron?

During their 'five-year odyssey', the researchers analyzed the chemical composition of over 100 artifacts from what is now Greece, focusing on 91 iron objects, mostly rings, bracelets, and knives, dating from the Bronze Age circa 3,800 to 3,000 years ago.

Using non-destructive X-ray fluorescence, the researchers detected that 13 of these objects contain nickel and may have been forged using iron from meteorites.

Interestingly, all 13 of these items are fancy, Skyrim-worthy finger rings that incorporate other metals like gold or silver. The rings also feature bezels that may have held signets, such as royal seals.


A selection of the items analyzed in this study. Those with red dots are likely to incorporate iron from meteorites. 
(Gounelle & Mantzourani, J. Archaeol. Sci., 2026)



Additionally, most of the rings originate from luxurious funerary sites, like tombs in Mycenae. In true fantasy fashion, one ring was discovered in a Minoan necropolis, still adorning the finger of a supposed high priest.

"These observations led us to speculate that rings likely made out of meteorites may have been popular power symbols among prominent individuals, members of the Minoan and Mycenaean palatial elite," the researchers explain.

The meteoritic iron may have been imported from Egypt rather than locally found. The Greek geography is unkind to meteorites, which may disintegrate or be swallowed by the sea.

Egypt's arid deserts, which protect meteorites from oxidation and dissolution, are much better suited to their accumulation.

The researchers also determined that 78 of the iron objects used smelted iron, rather than cosmic iron, and that such smelted iron objects may have appeared as early as 1400 BCE during the Bronze Age – though only two of these, a pendant and a ring, were made before 1200 BCE.

Curiously, compared with finds from Anatolia, "the use of man-made iron seems to have been somehow delayed in Greece," the researchers note, mentioning the possibility that these items were imported from places like Cyprus.

The meteorite-ring craze lasted until around 1200 BCE and may have died out for various reasons, such as supply or demand difficulties, or the simplest, most human reason of all: sartorial fickleness.

It's "possible that the meteoritic finger ring fashion, almost exclusive to Minoan and Mycenaean Late Bronze Age, has 'naturally' faded away as does any fashion," the researchers conclude.


The birth of modern Man
https://chuckincardinal.blogspot.com/

Melting Sea Ice Could Be Changing the Clouds Above the Arctic

By U. of Birmingham, Aug. 13, 2026
https://scitechdaily.com/melting-sea-ice-could-be-changing-the-clouds-above-the-arctic/

Scientists have identified a previously unknown Arctic process that rapidly produces particles capable of seeding clouds near the edge of melting sea ice. 
Credit: Shutterstock

As Arctic sea ice melts away, it may be doing more than exposing open ocean. Scientists have found that the retreating ice could also help create many of the tiny particles needed to form clouds.

Scientists have discovered a previously unknown natural process in the Arctic that can rapidly increase the number of particles capable of forming clouds. Observed near the boundary between melting sea ice and open ocean, the process is driven by marine emissions and sunlight and could influence cloud cover, sunlight reflection, and the pace of future climate change.

The discovery adds a previously missing piece to an already complicated Arctic climate system. Clouds can change how much solar energy reaches the ocean and ice below while also affecting the escape of heat back toward space. Their overall effect depends on factors including season, location, cloud properties, and the surface beneath them. Scientists are still working to understand how these interactions will evolve as Arctic sea ice disappears.

Published in Nature Geoscience, the study was led by the University of Birmingham with an international team that included researchers from China and Spain. The scientists found that the boundary between open ocean and sea ice acts as an especially active source of the chemical ingredients needed to make new atmospheric particles.

How Arctic Cloud-Forming Particles Develop

Cloud droplets do not usually appear from water vapor alone. They form around tiny airborne particles known as cloud condensation nuclei. Sources can include sea spray, dust, pollution, and particles created through chemical reactions in the atmosphere.

In this newly documented Arctic pathway, iodine, sulfur compounds, and organic chemicals released from the ocean and surrounding environment react in sunlit air. The resulting molecules can first create extremely small particles and then help them grow until some become large enough to seed cloud droplets. Laboratory research had already shown that iodine oxoacids and other compounds can participate in atmospheric particle formation, but the new study demonstrates the mechanism under real Arctic conditions.

Co-author Dr. James Brean, Assistant Professor in Atmospheric Science at the University of Birmingham, said, “Our findings provide the first real-world validation of a recently identified atmospheric chemistry mechanism involving iodine oxoacids and sulfuric acid. Until now, this process had only been demonstrated in laboratory experiments at the CLOUD chamber at CERN.”

The measurements came from an expedition aboard the Royal Research Ship Discovery around Greenland and the Davis Strait during spring and summer 2022. The research was supported by the Natural Environment Research Council (NERC).

Sunlight and Marine Emissions Drive Particle Formation

What the team saw was not an isolated curiosity. New particles appeared on more than 80% of the sunny days studied, indicating that this chemistry occurs frequently in the region.

The new particles form when sunlight transforms a mixture of naturally emitted chemicals, including:

Iodine compounds released from the ocean, sea ice, and coastal environments.

Dimethylsulfide, produced by marine plants and algae.

Organic compounds released naturally from the ocean or land.

Previous Arctic measurements had already linked new particle formation to substances including sulfuric acid, ammonia, marine organic compounds, and, in some cases, iodine. The new findings reveal how strongly several of these chemical pathways can work together near the sea ice boundary.

Newly Discovered Molecules Help Particles Grow

The researchers also identified a new category of atmospheric compounds called iodine-containing oxygenated organic molecules (I-OOMs).

These molecules appear to solve an important part of the particle formation puzzle. Creating a microscopic particle is only the beginning. It must survive and grow substantially before it can serve as a nucleus for a cloud droplet. The newly detected organic molecules appear to assist that growth.

Dr. James Brean added, “These newly identified compounds help small particles grow into larger particles that can seed clouds – we believe this is the first time such molecules have been observed and implies important new pathways for iodine chemistry.”

Marginal Ice Zone Becomes a Particle Hotspot

The most dramatic activity occurred in the marginal ice zone, the shifting band where open seawater meets melting sea ice. This environment is also highly biologically productive, providing abundant marine emissions that can feed atmospheric chemistry.

During one event, researchers measured cloud-seeding particle concentrations rising from roughly 50 to 1,500 per cubic centimeter.

That location is particularly significant because the marginal ice zone changes as the Arctic loses ice. Satellite observations have documented a major long-term decline in Arctic sea ice, exposing increasing areas of open water during the melt season. Snow-covered sea ice is also highly reflective, sending roughly 50% to 70% of incoming solar energy back upward, while darker ocean water absorbs far more of that energy.

What the Discovery Could Mean for Arctic Climate

The newly identified particle pathway introduces another potential consequence of that transformation. As ice retreats, more biologically active ocean and ice edge environments may become exposed to sunlight and the atmosphere, potentially changing the supply of particles available for cloud formation.

Corresponding author Zongbo Shi, Professor of Atmospheric Biogeochemistry at the University of Birmingham, who led the study, said, “Our discovery is important because these new particles can influence clouds, which play a critical role in determining how much heat is retained or reflected. More clouds or thicker clouds in the warming season could potentially accelerate ice melt while cooling down the open ocean.

“The Arctic has warmed more than three times faster than the global average over the past 40 years, making it one of the most sensitive regions on Earth to climate change. Understanding how natural emissions influences clouds is critical for predicting climate changes in this region. Our discovery will help climate models to improve understanding of how climate change is affecting the Arctic and how the region itself influences global climate.”

Because current climate models do not yet include this process, its potential impact on the Arctic remains absent from projections. The team is now working to incorporate the newly identified mechanism into future modeling.


The Life of Earth
https://chuckincardinal.blogspot.com/

Ancient Neanderthal DNA May Give Some People More Muscle

By Max Planck Institute for Evolutionary Anthropology, Aug. 13, 2026

A growth hormone receptor inherited from Neanderthals remains present in some modern populations – and appears to amplify growth-related signaling.
 Credit: Stock

A Neanderthal-derived growth hormone receptor still carried by some people today appears to amplify growth-related signals in cells.

Some people alive today still carry a version of the growth hormone receptor inherited from Neanderthals, and its effects can be measured in their bodies. Neanderthals were typically more powerfully built than most modern humans, with skeletal evidence of substantial muscle mass as well as features including pronounced brow ridges and relatively short tooth roots.

Growth hormone plays an important role in the development of muscles and bones. Produced by the pituitary gland at the base of the brain, it circulates through the bloodstream and acts by attaching to receptors on the surfaces of cells, which transmit the hormone’s signal into the cell.

Researchers led by Hugo Zeberg of Karolinska Institutet and Philipp Kanis of the Max Planck Institute for Evolutionary Anthropology examined the Neanderthal form of this receptor. They identified two changes that are absent from the receptor version found most commonly in modern humans.

Neanderthal receptor strengthens growth signals

When the researchers tested the Neanderthal receptor in laboratory-grown cells, those cells showed a stronger response to growth hormone. They grew 40 percent more than cells carrying the more common modern human receptor. Most of the increased response could be traced to one of the two Neanderthal-specific changes.

The receptor variant entered the modern human gene pool through interbreeding with Neanderthals about 47,000 years ago. Its frequency varies substantially today. In some South Asian populations, as many as 24 percent of people carry it, and it is also particularly common in East Asia. Among Europeans, the frequency is around 0.5 percent.

“What struck me most was that two very different types of evidence told the same story,” says Philipp Kanis, first author of the study and a postdoctoral researcher at the Max Planck Institute for Evolutionary Anthropology. “Cells grown in the laboratory responded more strongly, while data from more than a million people showed signs of the same effect in the body. It is rare to see laboratory and population evidence fit together so clearly.”

Effects appear after childhood

The influence of the Neanderthal receptor does not appear to become evident during early growth. After examining body measurements from more than 6,000 children, the researchers found no association with growth through age eleven. The findings suggest that its effects could emerge later, possibly near puberty, when growth hormone levels rise substantially. Among adults, carriers of the Neanderthal version had an average of about 270 grams more muscle mass.

“As someone who does CrossFit, I was delighted to find Neanderthal genetics and muscle mass coming together in the same study,” says co-author Miriam Berreiter. “But even a Neanderthal growth hormone receptor is no substitute for training.”

Skull and teeth retain subtle traces

The inherited receptor variant was also associated with small differences in the skull and teeth. People who carried it tended to have a slightly shorter rear portion of the lower jaw and shorter tooth roots, both of which more closely resemble features typical of Neanderthals.

“It is fascinating that one genetic change inherited from Neanderthals can still have an effect on the human body today,” says Hugo Zeberg, senior author of the study. “But this is only one of many genetic influences on growth and body shape. It cannot explain the Neanderthal body type on its own, and it certainly does not determine a person’s overall appearance.”


The birth of modern Man
https://chuckincardinal.blogspot.com/

Wednesday, 12 August 2026

https://www.sciencealert.com/just-7-days-of-meditation-can-rewire-your-brain-study-suggests

12 Aug. 2026, By M. Starr

(Hans Strand/Corbis Documentary/Getty Images)

Some truths about the Universe seem absolute.

Entropy flows one way. Gravity sucks. And nothing can outrun the speed of light.

But a quirk of how sound waves interact in water may have just shown how something can appear to.

According to two researchers, interference between waves traveling along two different paths can make their combined energy peak appear sooner than the peak of a wave traveling directly from source to receiver.

It works underwater with sound – which means that, theoretically at least, it could also work with waves of light in a vacuum. And it wouldn't even need to break physics.

"We prove the speed of information is less than or equal to the speed of light in a vacuum, so the effect does not violate special relativity," acoustician John L. Spiesberger of the University of Pennsylvania and oceanographer Eugene Terray of the Woods Hole Oceanographic Institution write in a paper accepted for publication in Physical Review E.


The research emerges from earlier work studying how sound behaves underwater – and it all starts with whales.

Researchers studying whales calling to each other in the ocean can track down where a whale is by recording using multiple hydrophones – basically, the timing of the signal arrival at each hydrophone allows signal triangulation.

But Spiesberger and his colleagues found that, in some situations, this method could produce significant errors. In a 2025 paper, they elucidated a phenomenon that could explain why.

If the whale was close enough to the surface, some of the sound of its call would travel directly to the hydrophone, while some would reflect off the underside of the water's surface.

If the two waves overlapped at the hydrophone, their interference would shift the peak of the received wave, making it appear to arrive later – that is, at a slower effective speed than the direct wave alone.

The previous work showed that the interference could make sound appear to move more slowly – but when Spiesberger started looking at different, more realistic pulse shapes, he noticed something extraordinary.

Under the right conditions, the effect could work in the opposite direction.

Interference between direct and reflected sound waves can shift the energy peak later (b), or earlier (c), than the direct wave alone (a). 
(Spiesberger & Terray, PRE, 2026)

You have the pulse traveling directly, and the pulse bouncing off a flat surface. If you tweak the timing between them just so, interference reshapes the combined pulse so that the peak reaches the receiver before the peak of the direct pulse.

In one simulation, the researchers modeled sound traveling underwater at a speed of 1,500 meters (4,920 feet) per second.

The resulting energy peaks, they found, could appear to travel at 1,694.5 and 2,782.5 meters per second – the latter of which is nearly double the speed of sound in the simulation.

Here's the thing, though. This phenomenon may not be limited to sound. The researchers posit that it should work for light in a vacuum, too.

"Our conjecture that the direct + reflected path effect exists for electromagnetic waves provides a mechanism for superluminal propagation distinct from microwave tunneling, quantum tunneling, and anomalous dispersion," Spiesberger and Terray write.

"These yield effects occurring at speeds exceeding light speed in a vacuum, yet the speed of information is less than the speed of light in a vacuum. Hence, we explore if the direct + reflected path effect also conveys information at speeds less than light speed in a vacuum."

Now, according to special relativity, information cannot exceed the speed of light in a vacuum. But there's a distinction to be made between the energy peak of the wave and the information it carries.

To test the speed of the information, the researchers modeled the transmission of two different signals, represented by a 1 and a 0. Up to a certain point known as time zero, the two signals are identical; at time zero, the source switches to either 1 or 0, which then propagates towards the receiver along the direct and reflected paths.

The point at which the receiver can reliably tell whether the signal is 1 or 0 marks the point at which new information has successfully reached the destination.

And the researchers found that this information could not travel any faster than the wave carrying it along the direct path. Interference can shift the energy peak forward, but it couldn't create information at the receiver before that information had traveled there the old-fashioned way.

Curiously, though, although interference couldn't push information beyond the speed limit, it did give it a little speed boost. The researchers weren't sure why.

The next step is to experimentally try it – either with sound or with light – to see what happens.

"Should the direct + reflected path effect occur for electromagnetic waves, and should it yield superluminal speeds, it would be the simplest method for doing so among other superluminal phenomena," Spiesberger and Terray write.

"Classical physical effects are sometimes echoed in quantum mechanics, and it might be worth considering if the direct + reflected path has analogies in the quantum world."


The Life of Earth
https://chuckincardinal.blogspot.com/

A Week-Long Meditation Retreat Produced Psychedelic-Like Brain Changes, Study Finds

11 Aug. 2026, By P. Dockrill

(miniseries/E+/Getty Images)

It's only reasonable to assume that attending a seven-day meditation retreat would have a calming and restorative effect on a person.

After all, guided meditation classes, healing rituals, and sessions on how to achieve transcendental states… it sounds pretty good, right? Sure beats catching the bus to work.

But these kinds of activities could be much more transformative than we realized.

In unison, they appear to have a surprisingly dramatic and deep effect on the body and the mind, scientists say.

A study published in Communications Biology in 2025 found that attending a seven-day meditation retreat was associated with a kind of neural reprogramming in participants, potentially yielding changes that could be positive for our health.

"This isn't about just stress relief or relaxation," said biomedical researcher Hemal Patel from UC San Diego.

"This is about fundamentally changing how the brain engages with reality and quantifying these changes biologically."

https://www.youtube.com/watch?v=m8rRzTtP7Tc

While the findings don't demonstrate cause and effect – this was only a small observational study – they suggest the effects of meditation and related activities could be more powerful and wide-ranging than we realized.

Patel and his team studied 20 healthy adults who were randomly selected from more than 500 attendees at a meditation and health retreat in San Diego.

During the seven-day retreat, participants attended daily lectures emphasizing the body's self-healing abilities, the mind's capacity to shape reality, and the healing power of present-centeredness and mystical-type experiences.

They took guided meditation sessions, in which they practiced conscious breathing techniques, and were involved in group healing rituals, where 'healers' would meditate while focusing their attention on one of the group.

Of the 20 participants in the study – 14 female, 6 male, with an average age of about 46 – 11 of the group were advanced meditators (with at least six months' experience with the techniques), while the other 9 were novices.


The effects of meditation and related activities could be more powerful and wide-ranging than we realized. 
(ArtistGNDphotography/Getty Images Signature/Canva)



In addition to attending the retreat activities discussed above, the study participants also undertook several tests before and after the event.

This included having their brains scanned by functional magnetic resonance imaging (fMRI), blood plasma tests, and filling out a questionnaire designed to measure people's experience of mystical states and feelings – even in the absence of psychedelic drugs, which were not consumed by the study participants.

After taking part in the meditation retreat, the participants showed significant changes in multiple tests.

While we can't conclude the meditation activities caused these changes – there was no control group to compare against, for example, it's purely observational data – what the researchers found is definitely interesting.

The fMRI data showed that after the meditation, brain activity was reduced in the default mode network, which is associated with self-referential and internally directed thought. Brain activity was also reduced in the salience network, which helps detect both internal and external stimuli.

Meditation appeared to reduce the level of segmented activity in the brain, inducing a whole-brain functional state where information flowed more efficiently, the researchers report.

To test whether the meditation activities may have affected the participants' neuroplasticity, the researchers applied the participants' post-meditation blood plasma to neurons in a dish, observing that the cells grew significantly longer neurites (extensions branching from the cell) than pre-plasma-treated cells.

Other markers of change detected in participants' blood included a shift towards glycolytic metabolism, signals of immune modulation, and increases in endogenous opioids (naturally occurring pain-relief chemicals) in the body.

Post-retreat responses in the Mystical Experience Questionnaire (MEQ–30) showed participants with significantly increased scores (from 2.37 to 3.02), which the researchers say is comparable to results seen with psychedelic use.

"We're seeing the same mystical experiences and neural connectivity patterns that typically require psilocybin, now achieved through meditation practice alone," said Patel.

"Seeing both central nervous system changes in brain scans and systemic changes in blood chemistry underscores that these mind-body practices are acting on a whole-body scale."

It's worth noting that one of the co-authors of the study, Joe Dispenza, is the CEO of the company Encephalon, which hosts the meditation retreats described in the study, in addition to selling access to other meditation and healing content.

Other caveats to note include that this is only a small study, and it's not one that can show causality, which the researchers acknowledge, calling for future studies that could implement more rigorous, controlled designs to measure how and if meditation might be triggering these changes.

But while we should be cautious about how we interpret these findings, they are certainly not the first to suggest meditation can have powerful effects.

Another recent study captured evidence of meditation reshaping brain activity, and other research shows meditation can help with pain relief, or reduce the burden of stress and aging.

Quite how far these effects may go, we still aren't really sure.

But we're getting closer to understanding.

"We've known for years that practices like meditation can influence health," Patel said.

"But what's striking is that combining multiple mind-body practices into a single retreat produced changes across so many biological systems that we could measure directly in the brain and blood."


The Life of Earth
https://chuckincardinal.blogspot.com/

Sitting Up Straight Could Actually Help You Make Better Decisions

By McGill U., Aug. 11, 2026

Sitting upright was linked to a more positive mood and more effective risk-taking in a study of nearly 200 people. 
Shutterstock

New research suggests that even a small shift in posture may influence both mood and the ability to take calculated risks.

In a McGill University experiment involving nearly 200 participants, people encouraged to sit upright reported stronger feelings of pride and performed better in a game that balanced risk against reward. Those who leaned over a low desk generally took fewer risks and earned less.

The findings suggest that ordinary features of a room, including desk height and screen placement, may shape behavior in subtle ways without people noticing.

Jorge Armony, a professor in McGill’s Departments of Psychiatry and Psychology and the study’s senior author, emphasized that the effects were modest and observed under controlled laboratory conditions. Still, he said the results offer further evidence that physical position can influence emotional experience and decision-making.

How Researchers Changed Sitting Position

Rather than asking participants to sit in a particular way, the researchers changed the environment around them. This distinction was central to the experiment.

After completing initial computer tests, participants moved to a tablet for what they believed was an evaluation of a mobile application. Some used a tablet raised on a stand and placed on an adjustable table, naturally encouraging a straighter sitting position. Others worked with the tablet lying flat on a lower desk, causing them to bend forward.

Upright Posture and Smarter Risk-Taking

The volunteers then played a computerized game known as the balloon analog risk task. Each time they inflated a virtual balloon, they increased the potential reward. But every additional pump also raised the chance that the balloon would burst and erase the earnings from that round.

Participants sitting upright tended to inflate the balloons further and collect larger rewards. Their behavior was not simply reckless, according to the researchers, because they also performed more successfully overall.

“This suggests they were not acting more impulsively but rather were engaging in more effective risk-taking,” Armony explained.

The difference also appeared in participants’ emotional responses. In a questionnaire, the upright group reported significantly greater feelings of pride, an emotion associated with positive mood.

Testing the Power Pose Debate

Debate over posture’s psychological effects has continued for years, particularly following widely publicized research on “power poses.” Critics have argued that people in such experiments may guess the study’s purpose and respond in ways they think researchers expect.

The McGill team designed its experiment to reduce that possibility. Participants received no instructions about how to hold their bodies. Instead, the position of the tablet and desk quietly guided their posture.

Interviews conducted afterward indicated that most participants did not realize posture was part of the experiment. The study also found that the results remained after accounting for possible complications such as physical discomfort and awareness of the manipulation.

What the Findings Really Mean

To confirm that the setup produced a measurable physical difference, the researchers used video analysis software to track the angle of each participant’s neck. Earlier posture experiments often relied on instructions without objectively measuring whether people consistently adopted the intended position.

The study does not show that sitting straighter will radically improve someone’s judgment, confidence, or success. Posture is only one of many factors that may affect mood and behavior, and the researchers cautioned against treating it as a dramatic life-changing technique.

Still, the findings raise a broader possibility: everyday surroundings, including the design of our workspaces, may quietly shape how we feel and make decisions.


The Life of Earth
https://chuckincardinal.blogspot.com/

Tuesday, 11 August 2026

Industrial Chicken Farming Is Supercharging the Spread of a Dangerous Foodborne Bacterium

BY U. OF OXFORD, AUG. 10, 2026

Professor Samuel Sheppard, Science Lead for Digital Microbiology and Bioinformatics at the Ineos Oxford Institute for antimicrobial research (IOI). 
Credit: Ineos Oxford Institute for antimicrobial research (IOI)

The global expansion of chicken farming has created conditions that allow Campylobacter to spread, mix and adapt more readily.

Commercial poultry farms now hold billions of chickens, creating a vast habitat where bacteria can move, mix and adapt. An analysis from the Ineos Oxford Institute for Antimicrobial Research at the University of Oxford found that industrial poultry production has increased the movement of Campylobacter more than 100 times, allowing strains once associated with wild birds to circulate widely among farmed chickens.

Campylobacter is the world’s most common bacterial cause of diarrhea. In the UK, it produces more than 3.5 times as many cases of gastroenteritis each year as all other monitored foodborne bacteria combined. Treatment is also becoming more difficult as antimicrobial resistance (AMR), the ability of bacteria to withstand drugs intended to kill them, continues to rise.

To reconstruct how poultry farming changed the bacterium, researchers analyzed nearly 2,800 Campylobacter genomes collected from chickens and wild birds in 30 countries (including the UK and USA) between 1979 and 2024. Their study, published in the Proceedings of the National Academy of Sciences (PNAS), indicates that the global growth of chicken production has given different strains more opportunities to spread, exchange genetic material and acquire traits that support survival.

Expanding flocks transformed bacterial spread

The worldwide chicken population has grown seven-fold since the 1960s, reaching approximately 31 billion birds. Chickens now represent about 70% of all bird biomass on Earth. This expansion has made affordable animal protein available on an enormous scale, but it has also produced favorable conditions for bacteria to circulate and evolve.

Genomic analysis identified changes associated with Campylobacter adapting to life in chickens. The affected genes were involved in antimicrobial resistance, tolerance of oxidative stress, acquisition of metals and motility, all of which can improve bacterial survival within modern poultry production systems.

Oakem Kyne, PhD researcher at the Ineos Oxford Institute for antimicrobial research (IOI). 
Credit: Ineos Oxford Institute for antimicrobial research (IOI)



Professor Sam Sheppard, Professor of Microbial Genomics and Evolution at the University of Oxford and senior author of the paper, said: “Industrial farming has created one of the largest animal habitats on the planet. Our findings provide new evidence that human-driven environmental change can increase the spread of infectious diseases.

“As chicken populations have grown, bacteria that were once largely confined to wild birds have gained far more opportunities to enter poultry flocks, spread and become established. Understanding these evolutionary consequences is essential if we are to reduce future risks from zoonotic disease and antimicrobial resistance.”

Dense flocks can amplify new strains

The findings suggest that enormous, densely packed flocks may function as ecological ‘pathogen sponges,’ taking in bacterial strains from different sources and amplifying them.

Mathematical modeling showed that after chicken populations pass a critical size, Campylobacter strains originating in wild birds can continue circulating within poultry without repeated introduction. This can happen even when those strains are initially poorly suited to chickens.

The findings have direct relevance to human infection. An earlier IOI study associated 80% of human Campylobacter infections in Oxfordshire with poultry meat and found that many of those infections were resistant to antibiotics.

Farming practices shape bacterial evolution

Oakem Kyne, a DPhil student at the University of Oxford and first author of the paper, said: “As Campylobacter strains adapt to life in poultry, they can acquire traits that help them survive in challenging environments, including traits linked to antimicrobial resistance. Understanding how farming practices influence bacterial evolution is an important step toward reducing the burden of foodborne disease.”


The Life of Earth
https://chuckincardinal.blogspot.com/

Psychopathic Tendencies Are Linked to Microbes Inside Your Body, Study Reveals

11 Aug. 2026, By P. DOCKRILL

(Alexander Krivitskiy/Unsplash)

The more we find out about the microbiome, the more we realize how truly profound its effects are in shaping who we become.

We already know that the microbes in our bodies may affect our emotions – including our fear response – but how far does their influence reach in terms of determining our personality?

The answer, research suggests, is pretty far.

In a new early-release study published in Translational Psychiatry, scientists have found evidence to suggest that microbiota may even influence people's experience of psychopathy, with researchers discovering links between levels of certain gut and oral microbes and psychopathic personality traits.

While the findings have yet to undergo peer review, the researchers say it's the first time we've found evidence of how microbiota could contribute to psychopathic traits, which remain poorly understood in terms of their biological underpinnings.

Psychopathy is a personality construct marked by characteristics including lack of empathy, antisocial tendencies, impulsiveness, and egoism, but where psychopathic personalities emerge from is still not fully clear.

https://www.youtube.com/watch?v=UjGMiChiUFc

We know that psychopaths can share similarities in brain structure, with certain regions and pathways in the brain, including the prefrontal cortex, often linked with the phenomenon.

But researchers say there has to be more to it.

"Though brain alterations, particularly in the prefrontal cortex and temporo-limbic areas, are suggested to be directly implicated in psychopathy, these alone are insufficient to provide a comprehensive neurobiological explanation for psychopathic behavior," researchers explain in their paper, by first author and biomedical scientist Carolina Costa from the University of Porto in Portugal and her colleagues.

"We hypothesized that the composition of the gut and oral microbiota may be associated with subclinical psychopathic personality traits… To our knowledge, this is the first study to explore this association."

In their research, Costa and her team studied 200 healthy adult participants who filled out the Self-Report Psychopathy Scale-Short Form – a questionnaire designed to measure psychopathic traits – and donated blood, saliva, and fecal samples, which were analyzed for signs of bacterial composition in the body or various metabolic markers.


Psychopathy is a personality construct marked by lack of empathy, antisocial tendencies, impulsiveness, and egoism. 
(disqis/Getty Images)



When people's individual diversity of gut and oral microbes was analyzed, no clear links to psychopathy were found, but the picture changed when the participants' results were compared against one another.

From that perspective, a higher abundance of three specific kinds of bacteria showed a positive association with stronger psychopathic traits.

Carrying more microbes in your gut microbiome from the genera Allisonella or Prevotella – or from the species Cloacibacillus evryensis – could mean you're more likely to show psychopathic traits, based on the analysis here.

It's worth noting that none of these results can speak to causation; the research here only surfaces correlations in the data.

But hypothetically speaking, if these microbes do influence people's behavior towards psychopathic tendencies, then how?

We don't know for sure, but the researchers note that Allisonella has previously been linked to several human diseases, and its potential to promote inflammation, which is associated with anxiety and depression, could help explain its possible role in psychopathy.

Similarly, Prevotella has previously been linked with neuropsychiatric disorders, and is thought to affect emotional processing, while the researchers say C. evryensis's association might be due to its suspected role as a producer of gamma-aminobutyric acid (GABA), an inhibitory neurotransmitter involved in systems that regulate impulse control.

Interestingly, one species in the analysis showed a negative association: higher levels of Treponema vincentii in the oral microbiome were linked with lower psychopathy markers, although the researchers admit they don't have an answer for that.

While a lot more research is needed to better understand how these gut microbes may contribute to psychopathic traits, the findings do give us some important new leads to chase down – and could one day support clinicians in identifying people who show these dark impulses.

"Overall, our findings highlight the potential of microbiota and their metabolic outputs as biomarkers for psychopathic traits in the general population," the researchers write.

"The associations we observed, particularly between specific taxa (e.g., Allisonella, Prevotella, C. evryensis, T. vincentii) and traits such as callousness, manipulation, impulsivity, and anti-sociality, suggest a measurable biological footprint for psychopathy that extends beyond traditional neurocognitive models."


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Ant Colonies Pulse Like a Physical System, And Scientists Are Beginning to Understand What Triggers Them

11 August 2026, By E. ÖZ

(andersboman/E+/Getty Images)

An ant nest can appear to be a jumble of tiny bodies moving independently.

But every so often, something remarkable happens: much of the colony springs into action almost at once.

These sudden flurries, known as activity bursts, are followed by stretches of relative calm.

Scientists compare these bursts to phase transitions of physical systems and have observed them for decades, but how so many ants synchronize without a leader remains unclear.

A new mathematical model, described in a study published in PRX Life, suggests that ant colonies suddenly become synchronized after reaching a critical point.


(Pebi WMF/500px/Getty Images)



Before this point, ants move independently. But once the colony crosses it, a single ant can trigger a wave of activity throughout the nest.

"Synchronization does not depend on any specific individual; any ant can serve as the first mover," New Jersey Institute of Technology biologist Simon Garnier says in an article published by the American Physical Society.

New York University mechanical engineer Michael Napoli and urban systems engineer Maurizio Porfiri developed the model with Garnier.

"The emergence of activity rhythms in our model is closely dependent on two key ingredients: the colony must be responsive to the activity of a single individual – sensitive to social contagion – and this individual must spread the activity much faster than the timescale of the activity bursts," Napoli told ScienceAlert.

"This insight provides a perspective on other complex systems where burst-like behavior may emerge, but does not persist, whereby the lack of one of these two ingredients ruins the synchronization."


Activity rhythms generated by the mathematical model, showing bursts of activity separated by quieter periods. 
(Courtesy of Michael Napoli)



Ant colonies contain surprisingly large numbers of inactive workers, but an encounter with a moving nestmate can prompt one to start moving.

Earlier models represented this social activation as a probability. The new model also accounts for the physical encounters required for activity to spread.

In the model, ants switch among three states: active, inactive, and refractory.

Active ants move and can activate nearby nestmates. Inactive ants remain still but can be prompted into action. Refractory ants are stationary and temporarily unable to reactivate, preventing bursts from continuing indefinitely.

Model parameters were based on earlier measurements.

Two ants interacting. 
(Maksim Shutov/Unsplash)



In simulations, activity faded before spreading when ants moved too slowly or encountered one another too infrequently.

But when speed, density, or interaction range crossed a critical threshold, encounters became frequent enough for one ant's activity to cascade through the colony.

Napoli compares the effect with a physical phase transition, such as water freezing, but stresses a key limit.

"The transition decides whether the burst is present, not if a burst will occur over the next time period," he said.

The model therefore cannot predict exactly when a quiet colony will spring into action. It determines whether the colony is in a state capable of producing synchronized bursts.

https://www.youtube.com/watch?v=VLBDVXLiWxQ

How, then, can one ant's activity spread through an entire nest before dying out?

"This is, perhaps, the most interesting result in the paper," Napoli said.

Earlier research has found that ant colonies can behave like neural networks when making collective decisions, and coordinate as a "superorganism" when responding to threats.

"We find that the bursts in the model emerge due to the dramatic difference in time scale between the motion of the ants – which spreads the activity – and the cycle between the behavioral transitions – which determines the burst period," Napoli said.

"This separation of time scales creates the proper conditions for the bursts to persist, and is comparable to many decision-making cascading phenomena in biological systems."

In other words, interactions spread activity much faster than the colony passes through its broader cycle of activity and rest. This allows movement initiated by one ant to travel from nestmate to nestmate without a commander.

The simulated bursts were broadly consistent with observations reported in earlier studies. However, the new study was mathematical rather than experimental, and tests with living ants are underway.

"Presently, experiments are being conducted and analyzed to validate the model against real ant data," Napoli told ScienceAlert.

"We are specifically interested in gauging the proximity of the colony to the transition threshold, whereby the activity bursts may serve as a platform for the colony to spread information extremely rapidly through the nest."

The results could show how closely living colonies operate to this threshold and whether bursts help information travel efficiently. Any evolutionary advantage remains unknown.

A 2023 modeling study suggested synchronized movement could improve access within crowded nests by reducing obstacles created by inactive ants.

Yet a 2017 study found that short-term activity cycles can impede information transmission when synchronized inactivity interrupts chains of physical contact among workers.

Activity bursts may therefore involve trade-offs among movement, communication, energy use, and the organization of work.



The Life of Earth

Monday, 10 August 2026

Gut Bacteria May Leave a Lasting “Protective Memory” in the Intestine

BY O. DIMMER, NORTHWESTERN U., AUG. 6, 2026

A metabolite produced when gut bacteria digest fiber may leave a lasting molecular imprint on the intestinal lining. In mice, this “memory” helped sustain immune tolerance and reduced inflammation even after the metabolite was no longer present. 
Credit: Stock

A fiber-derived bacterial metabolite may leave a protective memory in the gut lining that supports long-term immune tolerance.

A signal made by gut bacteria as they break down dietary fiber may continue shaping intestinal immunity long after the signal itself disappears. Northwestern Medicine researchers found that butyrate can leave a durable molecular imprint on the cells lining the intestine, encouraging immune tolerance and protecting mice against conditions resembling inflammatory bowel disease after treatment has ended.

The findings were published in Nature Communications. Yingzi Cong, PhD, the Stanley Gradowski Professor of Gastroenterology and a professor of Microbiology-Immunology and of Pathology, served as senior and co-corresponding author.

The results suggest that beneficial compounds produced by gut microbes may effectively “train” the intestinal lining to preserve an immune-regulating state over time.

“Our laboratory has long been interested in how the gut microbiota regulates immune responses at intestinal mucosal surfaces,” said first and co-corresponding author of the study Tianming Yu, PhD, research assistant professor of Medicine in the Division of Gastroenterology and Hepatology. “Short-chain fatty acids (SCFAs), which are produced by gut bacteria during the fermentation of dietary fiber, are known to have anti-inflammatory effects in the intestine.”


Tianming Yu, PhD, research assistant professor of Medicine in the Division of Gastroenterology and Hepatology, was the first and corresponding author of the study. 
Credit: Northwestern University



One important question, however, had remained unresolved.

“A large proportion of butyrate in the gut is rapidly absorbed and metabolized by intestinal epithelial cells (IECs), which limits the amount of free butyrate that can directly reach underlying immune cells,” Yu said. “This led us to ask whether butyrate might act through IECs to regulate intestinal immunity.”

Butyrate leaves lasting immune protection

To investigate that possibility, the researchers added butyrate to the drinking water of mice for a set period and then withdrew it. Two weeks after treatment stopped, CD4+ T-cells were still producing elevated levels of IL-10, a major anti-inflammatory cytokine that helps control inflammation in the intestine.

The treated mice were also more resistant to chemically induced colitis. Compared with untreated animals, they lost less weight, had lower levels of inflammatory markers, and developed less severe tissue damage. The study found that this protection depended on IL-10 signaling.

Changes in the existing gut microbial community did not explain the result. When the experiment was repeated in germ-free mice, which have no microbes, butyrate still produced a lasting immune-regulating environment.

“We found that oral butyrate treatment induces a sustained immunoregulatory response in the intestine, characterized by increased IL-10 production in CD4+ T-cells and protection from intestinal inflammation even after butyrate treatment is stopped,” Yu said. “This effect was also observed in germ-free mice, suggesting that butyrate can establish a lasting intestinal environment that does not depend on continuous microbial stimulation.”

Intestinal cells carry the signal

Yu and his collaborators next examined intestinal epithelial cells (IECs), the cells that create the physical boundary between the body and the gut microbiome. In laboratory experiments, epithelial cells previously exposed to butyrate strongly increased IL-10 production in both mouse and human T-cells.


Yingzi Cong, PhD, the Stanley Gradowski Professor of Gastroenterology and a professor of Microbiology-Immunology and of Pathology, was senior and co-corresponding author of the study. 
Credit: Northwestern University



“We further found that conditioned medium from butyrate-treated IECs strongly induced IL-10-producing CD4+ T-cells in both mouse and human T-cell culture systems,” Yu said. “These findings suggest that IECs secrete some immunoregulatory factors after butyrate treatment, and these factors can act on T-cells.”

A metabolite connects cells to tolerance

Metabolomic analysis, which measures small molecules produced during cellular activity, identified N1-acetylspermidine as one likely messenger. The compound increased IL-10 production in T-cells and appeared to account for part of the immune-regulating effect produced by butyrate-treated epithelial cells, Yu said.

“Mechanistically, we found that butyrate acts on IECs and induces sustained transcriptional and epigenetic activation of Sat1, an acetylpolyamine biosynthetic enzyme,” Yu said. “This promotes production of the metabolite N1-acetylspermidine, which contributes to the ability of butyrate-treated IEC-conditioned medium to induce IL-10 production in CD4⁺ T-cells.”

The results challenge the conventional view that intestinal epithelial cells are temporary responders whose main function is to form a protective barrier.

“The significance of this work is that it identifies a mechanism by which a microbiota-derived metabolite can create durable epithelial T-cell crosstalk,” Yu said. “The intestinal epithelium is often viewed as a short-lived barrier that responds rapidly to luminal stimuli. Our findings suggest that it can also retain a lasting imprint of a microbial metabolite signal. The study also introduces the idea that beneficial microbial metabolites may ‘train’ the IECs to maintain immune tolerance over time.”

Human disease remains the next test

The findings still require further confirmation, but Yu said the pathway could eventually prove relevant to inflammatory bowel disease.

“One important next step is to determine how this epithelial metabolic pathway operates in human intestinal disease, especially in patients with inflammatory bowel disease,” Yu said. “We are interested in testing whether the butyrate-Sat1-N1-acetylspermidine pathway is altered in human IECs and whether it correlates with immune regulation or disease activity.”

The researchers also intend to identify other metabolites involved in the response because N1-acetylspermidine did not fully account for the immune-regulating effects they observed.

More broadly, the findings may change how researchers think about the relationship among diet, microbial metabolites and the intestinal lining.

“Many studies have focused on how inflammation can leave harmful memory in epithelial cells, but our findings suggest that beneficial microbial metabolites may also establish protective epithelial programs,” he said. “Understanding how diet, microbiota-derived metabolites and inflammation shape intestinal epithelial memory could open new directions for restoring intestinal immune tolerance in inflammatory bowel disease.”


The Life of Earth
https://chuckincardinal.blogspot.com/

Starlink Satellites Reveal a Hidden Atmosphere 300 Miles Above Earth

BY KYOTO U., AUG. 9, 2026

Subtle changes in satellite orbits may reveal far more about near-Earth space than previously recognized. 
Credit: Shutterstock

Satellites designed to provide internet service are now serving an unexpected second purpose: helping scientists map the nearly invisible atmosphere at the edge of space.

Researchers at Kyoto University have used orbital changes from about 1,200 Starlink satellites to map Earth’s thermosphere, a thin and difficult-to-observe region of the upper atmosphere. Their analysis produced the first tomographic map of its kind, revealing atmospheric density patterns roughly 482 kilometers (300 miles) above Earth. The study was published in Earth, Planets, and Space.

Although satellites in low Earth orbit travel through what appears to be empty space, traces of atmosphere remain even hundreds of kilometers above the surface. Collisions with these sparse particles create drag, slowly reducing a spacecraft’s speed and altitude.

That effect becomes more intense when solar activity heats and expands the upper atmosphere. Geomagnetic storms can rapidly increase atmospheric density at satellite altitudes, altering predicted orbits and raising the difficulty of collision avoidance.

Why Thermospheric Density Matters

Knowing how density varies across the thermosphere is therefore important for tracking satellites, forecasting reentries, planning maneuvers, and estimating the paths of space debris. Yet the region remains difficult to observe directly.

The thermosphere extends from about 100 to 1,000 kilometers (62 to 621 miles) above Earth. More than 99 percent of the upper atmosphere consists of electrically neutral gas in this region. By comparison, the electrically charged particles of the ionosphere account for less than 1 percent.

A world-first achievement: successful tomographic analysis of thermospheric air density from Starlink satellite orbital data.
 Credit: KyotoU / Mamoru Yamamoto

The ionosphere can be studied through its effects on radio signals. Neutral particles in the thermosphere leave a far weaker signature, so scientists often rely on specialized instruments, models, or measurements collected along individual satellite paths.

The Kyoto University team instead treated the Starlink constellation as a vast network of moving atmospheric sensors.

Turning Orbital Drag Into Atmospheric Data

As each satellite traveled through the thermosphere, drag caused it to lose a small amount of orbital energy. The researchers calculated these changes using publicly available, detailed orbital records known as ephemeris data. They then applied tomography, a mathematical method also used to reconstruct medical scans, to estimate how atmospheric density varied across different locations.

“This is a multidisciplinary study between space science and space engineering,” says corresponding author Mamoru Yamamoto. “Reading papers from both research fields, we realized that deeper dialogue between researchers from both fields is necessary.”

Combining measurements from hundreds of satellites allowed the researchers to produce a two-dimensional map of density across latitude and longitude. Most earlier spacecraft observations provided readings only along a satellite’s individual route, which is similar to learning about a landscape by following a single road.

Improving Space Weather and Orbital Safety

The new method offers a wider snapshot. Its results were highly consistent with density variations measured by the European Space Agency’s SWARM satellites, providing an independent check on the reconstruction.

The work expands on an earlier study by the same team that used publicly available Two-Line Element, or TLE, records to examine changes in thermospheric density over time and altitude. The latest research adds the horizontal dimension, revealing how density differs from one geographic region to another.

Future versions of the system could potentially track thermospheric density close to real time. Such maps could improve space weather forecasts, refine orbital predictions, and help operators respond more effectively when solar storms disturb the upper atmosphere.


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“I Couldn’t Do It Anymore” – Antarctic Guides Quit Their Dream Jobs After Witnessing Tourism’s Damage

BY Z. SOKOLICKOVA, E. COOPER, AND C. HEHIR, AUG. 9, 2026

Some Antarctic guides found that protecting the place they loved ultimately meant leaving it. Their decisions expose a deeper tension between environmental awareness and the impacts of tourism itself. 
Credit: Shutterstock

Antarctic guides walked away from their dream jobs after tourism’s environmental damage became impossible to ignore.

“You’d see massive glacier calvings, and you’d just want to cry. But all the guests would be cheering. And you’d be like … ‘Can you not put two and two together?’”

Those are the words of a former Antarctic tour guide we interviewed. For anyone interested in nature, few jobs sound more enviable. You spend months among penguins, orcas, and glaciers, helping visitors experience one of the world’s most extraordinary and unspoiled places.

But for some guides, like those we quote in this article, that privilege slowly became impossible to reconcile with their beliefs. Watching climate change unfold while helping thousands more visitors reach the continent eventually led them to leave the jobs they’d once dreamed of.

Antarctica’s Tourism Paradox

Antarctic tourism is growing fast, with over 120,000 visits in 2025-26 and up to 450,000 expected each summer within a decade. Our new study reveals how Antarctic tour guides grapple with the dilemma at the heart of their work—bringing more and more people to an ecologically vulnerable area and helping cause some of the greatest CO2 emissions of any form of tourism.

“I was down there on the hottest day ever recorded in 2020. Hiking up a glacier in my T-shirt, driving boats without gloves. It was really sad. The impacts of climate change absolutely hit you in the face.”

We interviewed 25 former Antarctic guides who decided to quit their jobs (all quotes are anonymized). These guides couldn’t align their morals with the effects of tourism they were witnessing day after day.


As Antarctic tourism expands, former guides describe a growing conflict between introducing visitors to the continent and contributing to pressures on its fragile ecosystems. 
Credit: Zdenka Sokolickova



Very often, for long periods of time, the penguins had maybe a few hours’ break during the night. Otherwise, there were hundreds of people walking through the colonies non-stop.”

While tour operators often argue that visiting Antarctica can heighten tourists’ awareness of environmental issues, former guides were struck by guests’ ignorance of human impacts.

A Growing Moral Conflict

None of the guides quit overnight. Their decisions emerged through years of reflection, uncertainty, and moral conflict.

“We are always in conflict in our minds with two parts: the excitement to go to Antarctica to work in remote places we like and being complicit in tourism industry development.”

“I can’t work in the farce of climate change cruise tourism anymore. It’s just, how can I go there, tell people about climate change, and not do anything about it?”

The Personal Cost of Leaving

The former Antarctic tour guides show meaningful change is often a painful and gradual process rather than a single dramatic moment. For many, years of acting against their values affected their wellbeing.

“I think what it comes down to for me is, you know, if I think about being on my deathbed and trying to look my kids in the eyes and saying, ‘I tried.’ I don’t know if I could have done that if I kept doing what I was doing.”

The stories of guides who left one of the world’s most extraordinary tourism jobs powerfully illustrate how abandoning unsustainable lifestyles can come with real personal costs.

“To this day, Antarctica … stays in the forefront of my head as the most incredibly raw environment that deserves all the care and protection. And I just think tourism and us being there was doing the opposite of that completely.”

Loving Antarctica From Afar

Many of the research participants still felt deeply connected to Antarctica, and they sometimes regretted leaving. Mixed feelings and ambiguity are an inherent part of decisions we take out of concern and care for others, including remote environments.

“Do I wish I was getting on a flight and heading to the floe edge to take people out on the ice? Yes, there’s a big part of me that wishes I were doing that right now. And I also know that I would feel like shit after doing it.”

Walking Away to Protect It

In the case of the people we interviewed, caring about Antarctica meant walking away from Antarctic tourism. The interviews suggest that distance doesn’t necessarily weaken responsibility. For these former tour guides, caring for Antarctica ultimately meant leaving it—and many felt better after they quit. Sometimes the best way to protect a place you love is to leave it alone.

“I was working very much against what I knew wasn’t right, and I think that was coming out in my body as well. And then when I made that decision to walk away, I just felt so much better. It was like I could breathe again.”

If you’ve ever questioned whether your work aligns with your values, these former Antarctic tour guides offer a thoughtful perspective on balancing career, well-being, and environmental responsibility. Their stories may also inspire a deeper appreciation for protecting Antarctica by leaving it untouched.


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