Feeling Lonely May Take a Bigger Toll on Health Than Expected

By U. of Bristol, July 23, 2026

https://scitechdaily.com/feeling-lonely-may-take-a-bigger-toll-on-health-than-expected/

Loneliness and social isolation may affect health in different ways, with the strongest signals emerging for mental health and well-being.

 Credit: Stock

Loneliness appears closely tied to poorer mental health, well-being and overall health.

Feeling lonely is closely associated with poorer mental health, reduced well-being and worse overall health, according to collaborative research led by the University of Bristol, Nesta and Amsterdam UMC. Social isolation was also linked to lower well-being, while loneliness was associated with having multiple health conditions.

Loneliness is increasingly viewed as a public health concern as evidence connecting it with poor health continues to grow. A central question remains unresolved, however: does loneliness itself contribute to declining health, or do other underlying factors explain the relationship?

Three methods strengthen the evidence

Working with researchers from the universities of Oxford and Manchester, the group approached the question through three complementary methods: observational analysis, comparisons between siblings and Mendelian randomization, a genetics-based technique used to investigate possible causal relationships.

The researchers drew on the UK Biobank and large-scale genome-wide association studies to examine two related but distinct experiences. Loneliness reflects the perceived quality of a person’s relationships, while social isolation describes the number of social connections they have. The findings were published in Nature Communications.

Mental health shows the clearest link

Across the analyses, both loneliness and social isolation were connected with poorer mental health and lower well-being. Loneliness was also associated with worse general health.

The study did not provide clear evidence that either experience affected particular physical health conditions. However, the researchers caution that such effects cannot yet be excluded.

Taken together, the results support treating loneliness, and potentially social isolation, as public health concerns because of their relationships with mental health, well-being and general health.

Loneliness becomes a public health priority

As loneliness receives greater recognition as a public health challenge, efforts to address it could benefit individuals as well as society more broadly.

Dr. Zoe Reed, Research Fellow in the School of Psychology and Neuroscience at the University of Bristol, and corresponding author, said: “Our findings suggest that loneliness, and possibly social isolation, are still important public health concerns, especially for mental health and general health. Supporting people who feel lonely or socially isolated could help improve mental health, well-being and overall health.”

Lauren Bowes Byatt, Director of Nesta’s healthy life mission, added: “This research underlines that loneliness is likely to have a detrimental impact on our mental health and well-being. While this link may seem obvious, the topic has long been understudied. Studies like this can help to bridge this research gap, and by understanding how loneliness or social isolation may be contributing to ill-health, we can get closer to new and more effective solutions.”

Long-term effects remain uncertain

Further research is needed to clarify how loneliness and social isolation influence health and to identify the most effective ways of reducing their effects.

Because the study examined middle-aged and older adults, future work will need to determine whether the same patterns appear among younger people. Researchers must also investigate persistent or long-term loneliness, since participants’ loneliness was measured at only one point in time.

The findings add to evidence that loneliness and social isolation extend beyond the social sphere. Their links with well-being and mental and physical health make them important considerations for public health policy and practice.

The birth of modern Man

https://chuckincardinal.blogspot.com/

There's One Creature of The Deep That Can Scare Even Orcas Away

31 July 2026, By M. Starr

https://www.sciencealert.com/theres-one-creature-of-the-deep-that-can-scare-even-orcas-away

(kertu_ee/iStock/Getty Images Plus)

In recent years, our perception of the ocean's pecking order has been turned on its head.

Ever since Jaws, great white sharks have loomed large in the popular imagination as the undisputed rulers of the sea.

Then scientists discovered that these fearsome predators had a nemesis of their own: the mighty orca (Orcinus orca), sleek and cunning, hunting white sharks for their tender, nutrient-rich livers.

You might think there's very little that could rattle an orca.

You'd be wrong.

Just the hint of a squeal from a pod of long-finned pilot whales (Globicephala melas) can send orcas packing.


And the best part is that nobody really knows why.

https://www.youtube.com/watch?v=Q1_0IRv7prg

"Killer whales, the oceans' apex predators, respond to acoustic signals of pilot whales and likely perceive their presence as a threat," wrote a team led by marine biologist Anna Selbmann of the Sudurnes Science and Learning Center in Iceland in a paper published in Scientific Reports in January 2026.

"However, it remains unclear why this apex predator avoids a smaller, seemingly inferior aggressor."

The story begins in 2012, when a group led by marine biologist Charlotte Curé published a curious observation. Playing orca vocalizations to long-finned pilot whales in the wild acted as a sort of siren call that the pilot whales couldn't resist.

If they were within hearing range, they moved towards the sound.

Then, another group led by marine scientist Renaud de Stephanis of the Spanish National Research Council documented something even curiouser.

In a paper published in 2014, they noted that in every documented encounter between pilot whales and orcas in the wild from 2004, the orcas skedaddled. Once the pilot whales show up in orca-infested waters, the orcas no longer want to be there.

The long-finned pilot whale is a species of dolphin. (Vsevolod Rudyi/iNaturalist, CC BY 4.0)



The reason this is so curious is that there didn't appear to be a good ecological reason for it.

After conducting a field investigation in the Strait of Gibraltar, de Stephanis and his team found that two cetacean species don't compete for the same food, nor do they prey upon each other.

In addition, the long-finned pilot whale is significantly smaller than the orca. It should not pose a significant threat.

They concluded that maybe, at some point in the past, orcas may have preyed upon the pilot whales, and the pilot whales have a long memory, but there's not much evidence for that interpretation either.

Selbmann and her colleagues were perplexed – but fascinated.

They wanted to study more interactions between the two species.

In a 2022 paper, they analyzed data from research platforms and whale-watching tours in six regions of Iceland from 2007 to 2020, documenting when each species was in the area. Pilot whales were only seen during the summer months – but they often showed up in the orcas' favorite hangout spots.

Here's where it got weird.

In most of the 24 encounters – 68 percent – the orcas simply avoided meeting the pilot whales by moving away before the latter muscled in.

Long-finned pilot whales (left) and orcas (right) porpoising during a high-speed chase in Vestmannaeyjar, Iceland in July 2019.

 (Katarína Klementisová, Curt Hanson/Selbmann et al., acta ethol., 2022)

But in 28 percent of the encounters, a high-speed chase ensued, with both species porpoising along at a rate of up to 13.5 knots (25 km/h) – a type of motion that involves repeatedly leaping from the water to increase speed.

By 2026, the observations now span more than two decades, and they all point in the same direction: Orcas really do avoid long-finned pilot whales.

But one question lingered. Were the orcas really reacting to the pilot whales, or to something else happening during these encounters?

Previous studies had played recorded orca sounds to pilot whales.

Selbmann and her colleagues took the pilot whales out of the equation. Instead of waiting for the species to meet in the wild, they played recordings of pilot whale calls to tagged orcas.

The response was striking. The orcas tightened up their group formations, changed their vocal behavior, turned away, and sped up. The pilot whale calls alone were sufficient to invoke an aversive reaction in orcas.

"As previous work demonstrated that pilot whales are attracted to killer whale sounds, our study further demonstrates that acoustic signaling can mediate these interspecific interactions in both directions," the researchers wrote.

We still don't really know why the pilot whales gun so hard for orcas, or why the orcas flee; as the researchers point out, no direct physical attacks by pilot whales on orcas have been reported, despite the many observed interactions.

One possibility is a behavior known as mobbing. Rather than fleeing a dangerous predator, some animals band together to harass it until it leaves the area.

It's most frequently observed in birds – think of how crows might harass a student wearing a mask, or mynahs yelling about a cat, for example. It's less effort to get up and leave than to deal with a dive-bombing flock of birds, so that's what the predator does.

It's only a theory, though. Other explanations, such as competition for resources or protection of vulnerable calves, cannot be ruled out.

Still, there might be a life lesson in this for all of us. If you can't be the biggest and the strongest, you might be able to achieve your dreams by being the most annoying.

The Life of Earth

https://chuckincardinal.blogspot.com/

Scientists Reveal The Chain Reaction That Leads to Gluten Attacking The Gut

01 August 2026, By D. Nield

https://www.sciencealert.com/scientists-reveal-how-gluten-reactions-in-the-gut-lining-lead-to-celiac-damage

(Chatchai Tuppavasu/Getty Images/Canva)

Celiac disease is a serious lifelong condition, where the immune system attacks the small intestine whenever the gluten protein is digested. For people with the condition, wheat, barley, and rye are all off the menu.

We know that genetics play a part in triggering celiac disease, and that certain gene variations make people more vulnerable to developing it. What's less clear is exactly how the loud alarm that sounds in the immune system leads to tissue damage.

In a comprehensive review published in Frontiers in Immunology, researchers from the University of Rome Tor Vergata pulled together findings from more than 100 previous studies to get a wider picture of the celiac disease chain reaction – getting us closer to figuring out how it works, and how it might be better treated.

A multitude of factors contribute to a healthy gut bacteria balance.

 (Marafini et al., Front. Immunol., 2026)

"We here review the available evidence supporting the role of immune cells in celiac disease-associated tissue damage and discuss the basic mechanisms by which this destructive immune response is amplified," write the researchers in their published paper.

That emphasis on amplification is key to the review. Only some people with a genetic predisposition to celiac disease go on to develop it, so there must be other contributing factors (amplifiers) at play.

What's well established is that one factor in developing celiac disease comes from a disruption to the delicate balance of bacteria in the gut. The immune system needs to keep out dangerous threats, without going on the offensive to the extent that healthy tissue gets affected.

A multitude of disruptive problems occur in celiac disease.

 (Marafini et al., Front. Immunol., 2026)

When it comes to gluten, an enzyme called tissue transglutaminase 2 (TG2) helps to break it down – but in those with certain gene variants, this makes gluten's by-products look like foreign invaders to the immune system, which dispatches an army of soldier T-cells to attack.

"Under normal conditions, TG2 is mostly inactive in the intestine," write the researchers in their published paper.

"Nevertheless, inflammatory stimuli or cellular stress can increase the production and enzymatic activity of TG2, thus escalating immune responses to gluten."

However, T cells and the inflammatory signals they produce aren't the whole story.

 Those signals and other accompanying chemical messages kick immune cells called intraepithelial lymphocytes into action, which actually kill off the cells in the gut lining.

There's then more amplification: The review points to more recent research suggesting that structural cells in the gut called stromal cells communicate with the immune system to perpetuate the damage.

Other reviewed studies provide evidence that the gut bacteria mix has an influence on the whole process, as do other wheat proteins and antiviral-type signals called type I interferons, all contributing to the stress that the gut lining is put under.

And with so many variables contributing to gut bacteria, it follows that these variables may be related to celiac disease too.

"Some microbial communities may affect not only gluten deamidation but also activation of TG2, hence suggesting that celiac disease pathogenesis requires the interplay of genetic, environmental, and immunological factors," write the researchers.

This review adds to the findings of a 2024 study published in Gastroenterology, which found that the gut lining can be an active participant in celiac disease, not just a victim under attack from T cells.

That's backed up by the other research linked to from this review, providing the most comprehensive look yet at how the starting gun for the condition has a series of knock-on effects that all contribute to the related symptoms.

Without careful monitoring of their diet, those with celiac disease – around 1 in a 100 people – can experience bloating, pain, diarrhea, constipation, or vomiting simply by eating the wrong foodstuff.

Thankfully, better understanding the mechanisms behind the condition could eventuall led to new treatments beyond going gluten-free.

"It will be necessary to further improve celiac disease-like models to unravel the order of pathogenic events and to carry out preclinical testing of novel therapeutic strategies," write the researchers.

The Life of Earth

https://chuckincardinal.blogspot.com/

Scientists Tested an 8-Hour Eating Window and Found a Surprising Brain Benefit

By American Society for Nutrition, July 29, 2026

https://scitechdaily.com/scientists-tested-an-8-hour-eating-window-and-found-a-surprising-brain-benefit/

An eight-hour eating window may offer the aging brain a modest boost beyond weight loss alone. 

Shutterstock

Limiting the daily eating window may provide brain benefits beyond those associated with weight loss.

Eating within a shorter daily window may provide cognitive benefits beyond those associated with weight loss alone, according to results from a small clinical trial. The pilot study followed older women with overweight or obesity during a weight-loss program and found modest improvements on certain thinking tests among participants who compressed their daily eating period rather than only cutting calories.

“Losing weight alone will ward off some of the aging-related cognitive decline, and these data suggest that there may be additional benefits if you stop eating 4 hours prior to going to sleep and reduce food intake to 8-9 hours per day, compared to the usual eating window of 12 hours per day,” said Sue Shapses, PhD, RD, DFASN, professor at Rutgers University and Rutgers-RWJ Medical Center, the study’s Principal Investigator.

Shapses and her colleagues presented the results at NUTRITION 2026, the American Society for Nutrition’s flagship annual meeting.

Lifestyle changes could alter dementia risk

As populations grow older, Alzheimer’s disease and other forms of dementia are becoming increasingly common. Women and people with overweight or obesity generally face a greater likelihood of developing these conditions. Although diet and other lifestyle habits have been associated with dementia risk, relatively little research has tested whether changing those factors can lower it.

Two eating schedules put to the test

The trial included 47 women between ages 50 and 79 who had overweight or obesity. Every participant received guidance to reduce daily calorie intake by 500 calories. Of the group, 26 women were instructed to consume all food within fewer than nine hours each day, while the remaining participants continued eating across a typical window of about 12 hours. Those assigned to time-restricted eating generally ate between 10 a.m. and 6 p.m. Their average eating period was 8.2 hours per day, compared with 12.3 hours among women following the standard schedule.

A shorter window improves select skills

After six months, women in both groups had lost an average of approximately 15 pounds. Despite similar weight loss, participants eating within an 8-9 hour period showed significantly greater improvements in spatial planning and problem-solving than those maintaining a 12-hour window. They also tended to make fewer mistakes on tests of memory and learning, although that difference was not statistically significant. No meaningful differences appeared in multitasking ability or reaction time.

“There was a modest effect of time-restricted eating to improve spatial planning and problem-solving and on reducing errors related to memory and learning,” said Shapses. “These outcomes suggest a better ability to remember information during everyday tasks and reducing mistakes related to memory, attention and problem-solving. Reductions in the eating window predicted greater improvements.”

Larger trials must confirm the findings

Because the pilot study involved a small number of participants, the researchers emphasized that larger trials are necessary to verify the results. They also intend to examine possible biological explanations for the apparent benefits, including links among circadian rhythms, nutrient-sensing pathways, inflammation and metabolic health.

The Life of Earth

https://chuckincardinal.blogspot.com/

'Clear Evidence': Ancient DNA From Chilean Mummies Reveals Who Brought Smallpox to The Americas

31 July 2026, By D. NIELD

https://www.sciencealert.com/clear-evidence-ancient-dna-from-chilean-mummies-reveals-who-brought-smallpox-to-the-americas

(Anatoli Myshlyaev/Moment/Getty Images)

Smallpox is an age-old scourge with a terrible history.

Caused by the variola virus, it's thought to have been responsible for some 4 million total deaths in Indigenous communities in the Americas after European colonizers arrived – communities with no immune protection against the virus.

Previously, the evidence for this has been a historical paper trail.

Now though, 500 years later, we have the first solid genetic evidence that it was indeed smallpox contracted from Europeans that led to this catastrophic population decline in Indigenous communities.

Researchers from institutions in Ireland and Chile have discovered variola virus DNA on two naturally mummified corpses recovered in northern Chile, the remains of people believed to have died between 1492 and 1631 CE.

https://www.youtube.com/watch?v=yqUFy-t4MlQ

As explored in a new study published in Science, the virus genomes are almost identical – suggesting both individuals were infected at the same time – and place the disease in South America very soon after Europeans arrived.

It's a long-awaited breakthrough for ancient genetic evidence that's often so difficult to find on human remains after significant time has passed.

"This is not unique to smallpox but to ancient pathogens, humans, and other species broadly," biological anthropologist Constanza de la Fuente Castro, from the University of Chile, told ScienceAlert.

"We are working with DNA that is in low concentration and has accumulated damage over time. This is affecting our ability to recover it, but it is also challenging to analyze."

The researchers tracked lineages of the virus over time and across continents.

 (Romero González et al., Science, 2026)

The virus lineage was named CAM9 by the researchers. While it died out well before smallpox was eventually eradicated, when the team built up a 'family tree' of the virus, this strain fitted neatly between medieval European strains and modern variants.

You can think of it a bit like finding the remains of actual people – people we know to have descended from Europeans, found in Chile, after colonizers began arriving. Only here it's virus DNA, not human.

"The CAM9 genomes serve as a snapshot of the viral evolution," genomicist Shigeki Nakagome, from Trinity College Dublin, told ScienceAlert, "helping us understand which evolutionary changes had already occurred before smallpox reached the Americas during the early colonial period, and which changes occurred later and eventually gave rise to the lineage ancestral to all 20th-century strains."

What also emerged from charting out the ancestry of CAM9 was that its evolution slowed dramatically in the Americas for a couple of centuries shortly after this.

The genetic mutation rate of the virus sped up again in the 19th century, which the researchers suggest was down to widespread vaccination drives.

"Recovering ancient viral DNA is extremely challenging, so seeing clear evidence that these individuals were infected with smallpox was a remarkable moment for the entire team," Nakagome said.

"While the mechanisms behind this pattern require further investigation, it suggests that major changes in human demography and epidemiology may have influenced the adaptive landscape of the virus."

The smallpox virus. 

(Callista Images/Getty Images)



Besides giving us a better understanding of the spread of smallpox and its adaptations over time, and how a virus can react to human events such as colonization and vaccination, the study again highlights the wealth of expertise and ancient archaeological treasures to be found in countries such as Chile, which are part of what is sometimes referred to as the Global South.

The researchers are calling for a better balance between resources and funding for science in the Global South and the Global North, so that findings like these can be analyzed and preserved in the countries where they're discovered.

"I have known people working for decades in ancient DNA in South America who have sometimes been completely pushed out by foreign researchers with little interest in regional questions," De La Fuente told ScienceAlert.

"If we prioritize capacity building over exporting samples, it may take us longer to publish, but that knowledge will be rooted in the region, rather than extracted from it. It is worth the wait."

The Life of Earth

https://chuckincardinal.blogspot.com/

Earth May Be Twice As Vulnerable to Extreme Solar Storms As Scientists Thought

BY LANCASTER U., JULY 30, 2026

https://scitechdaily.com/earth-may-be-twice-as-vulnerable-to-extreme-solar-storms-as-scientists-thought/

Illustration of solar wind streaming from a fuming sun drives auroras bright enough to be seen far from the poles, a dazzling signature of an extreme geomagnetic storm. 

Credit: Nithin Sivadas, NASA Goddard Space Flight Center

Earth may be far more vulnerable to powerful solar storms than scientists realized, with extreme events potentially hitting modern technology twice as hard as previous models predicted.

Earth’s magnetic shield may not have the safety limit scientists once thought it did. New research suggests that the most powerful solar storms could disturb the planet’s upper atmosphere up to twice as severely as traditional estimates predict.

The finding challenges a decades-old assumption about how Earth responds when it is struck by unusually intense solar wind. Rather than reaching a maximum and leveling off, the planet’s geomagnetic response may continue growing as conditions become more extreme.

That could have serious consequences for a world increasingly dependent on satellites, GPS, radio communications, aviation, and interconnected power grids.

The study, published in Nature, was led by Dr. Nithin Sivadas of NASA’s Goddard Space Flight Center and included Dr. Maria Walach of Lancaster University. It examined why measurements have long appeared to show a ceiling on the strength of geomagnetic activity.

How Space Weather Threatens Technology

Space weather begins with activity on the Sun. The solar wind, a continuous flow of electrically charged particles, moves outward through the solar system and interacts with Earth’s magnetic field. Solar eruptions can greatly intensify this flow, sending disturbances toward the planet.

When those particles reach Earth, they can transfer energy into the magnetosphere and generate powerful electric currents in the upper atmosphere. The same process can produce brilliant auroras, but during extreme events it can also interfere with satellites, disrupt navigation and communication signals, increase radiation exposure for astronauts and pilots, and induce damaging currents in power networks.

Dr. Walach said, “Our planet’s magnetic field does a really great job of protecting us against many space weather effects, and so they often just show up as glitches or beautiful auroras. There are, however, extreme cases where satellites unexpectedly fall back to Earth, or we lose communication and GPS signals.”

The Magnetic Shield’s Supposed Limit

Scientists previously believed that Earth had a built-in limit on how strongly it could respond. Measurements indicated that atmospheric currents rose as the solar wind intensified, but eventually stopped increasing at the same rate. Researchers developed several physical explanations for this apparent saturation, including theories in which the magnetosphere restricted the amount of energy entering the upper atmosphere.

The new study proposes a very different explanation. The supposed ceiling may be a statistical illusion created by uncertainty in the measurements themselves.

Solar wind conditions are usually recorded by spacecraft near the first Lagrange point, or L1, roughly 1 million miles (1.6 million kilometers) closer to the Sun than Earth. From there, the spacecraft can provide advance warning of incoming space weather. However, the solar wind continues to move and change before it reaches the planet.

That distance creates uncertainty about both the timing and strength of the solar wind that actually strikes Earth. A particularly extreme measurement at L1 may not perfectly represent conditions at the magnetosphere several minutes later.

Regression to the Mean

This becomes especially important when researchers analyze rare events. Exceptionally high measurements are more likely to include unusually large errors. The true conditions associated with them will often be closer to the average, a statistical tendency known as regression to the mean.

As a result, an extreme solar wind measurement at L1 may be compared with a less extreme response at Earth. When many such observations are combined, the mismatch can make it appear that Earth has stopped responding proportionally, even when no physical limit has been reached.

The researchers tested that possibility using more than 1 million measurements collected by NASA spacecraft orbiting much closer to Earth. They also used statistical methods to account for uncertainty in the timing and intensity of the solar wind.

Once those uncertainties were corrected, the apparent saturation largely disappeared. Earth’s geomagnetic response remained closely proportional to the strength of the solar wind across the observed range. The analysis indicates that the effects of the most extreme storms could be about twice as large as earlier models suggested.

Preparing for Rare Extreme Storms

The findings do not show that Earth’s response will keep increasing under every possible condition. The strongest solar storms are extremely rare, so scientists have little direct evidence of how the planet would react to an event that may occur only once every few hundred or thousand years.

However, the study finds no convincing statistical evidence for the protective ceiling that has been incorporated into many theories and models. That means models that assume Earth’s response eventually levels off may underestimate the risks from the most powerful solar storms.

Dr. Walach said, “If there is no upper limit to our planet’s response to the solar wind, modeling for extreme cases needs to take this into account, and we should be vigilant of space weather effects. Fortunately, these very extreme cases are rare, but this also means we have limited data to work with, and only time will tell what happens at the very extreme one-in-a-thousand-year kind of event.”

Dr. Sivadas said, “We usually assume the truth may be around its measurement. But probability theory says it leans one way. That’s why space weather risks appear underestimated.”

The Life of Earth

https://chuckincardinal.blogspot.com/

Ancient hunter-gatherers mastered open-water voyages thousands of years before farming

ByA. Ionescu, Earth.com staff writer

https://www.earth.com/news/ancient-hunter-gatherers-mastered-open-water-voyages-thousands-of-years-before-farming/

07-30-2026

Thousands of years before farming reached the Mediterranean, small bands of hunter-gatherers were apparently sailing across open water on a regular basis.

Their journeys stretched at least 62 miles (100 kilometers), likely between Sicily and Malta, helping sustain that connection for more than a millennium. The discovery overturns long-standing assumptions about just how capable Europe’s last hunter-gatherer societies were at sea.

The research was led by Jimbob Blinkhorn from the University of Liverpool, along with Professor Eleanor Scerri from the Max Planck Institute of Geoanthropology.

The team examined new evidence from Malta, one of the most remote islands that hunter-gatherers colonized anywhere in the Mediterranean.

A puzzle hidden on Malta

The core problem the researchers set out to solve was simple to state but difficult to explain. Malta is far too small to have supported a hunter-gatherer population large enough to survive in total isolation for hundreds of years.

Yet archaeological evidence shows people living there continuously for roughly a millennium.

The researchers argue that this combination only makes sense if the island’s occupants maintained ongoing contact with a broader social network through repeated long-distance sea voyages.

“The ability to engage in long-distance seafaring marks a major transition in human history, in which previously impassable maritime barriers became the frontiers of new connections,” Scerri said.

“In the Mediterranean, single-stage, long-distance open-water sea voyaging is first documented in the Mesolithic.

“On Malta, we documented a continuous Mesolithic presence from at least 8,400 to 7,400 years ago. Was this an accidental stranding, or is it representative of a previously unknown seagoing network?”
How many people could survive?

To answer that question, the researchers combined modern ethnographic data with paleoclimate records and sea-level models to estimate how large a hunter-gatherer population Malta could plausibly have supported.

“Unlike farmers, hunter-gatherers are dependent on wild, natural food resources, whose abundance is largely governed by the climate for a given area,” Blinkhorn said.

“By modeling the relationship between modern hunter-gatherer population sizes and their environment, we were able to predict potential past population sizes using high-resolution paleoclimate datasets.

“While Malta was once connected to Sicily by a land bridge, this was inundated around 14,000 years ago, cutting Malta off and limiting the land area available to support hunter-gatherer populations.”

Preventing inbreeding and collapse

The team’s modeling put Malta’s maximum possible post-isolation population between 144 and 170 individuals. More realistic estimates based on ethnographic comparisons suggested the population was considerably smaller.

That low-density prediction holds across the full thousand-year span during which archaeological evidence documents continuous hunter-gatherer occupation on the island.

That population size falls dramatically short of what would have been needed for a group to survive that long in isolation.

“Long-term survival of a population, such as over a millennium evident in the archaeological record, would require 500 to 1,000 reproductive-age adults,” Blinkhorn said.

The researchers predicted that Malta’s population was far smaller than the minimum needed to avoid inbreeding.

They concluded that the island’s hunter-gatherers must have maintained repeated overseas connections with a wider gene pool to prevent population collapse.

Without sustained contact with mainland populations, genetic collapse through inbreeding would have been essentially inevitable. Yet the archaeological record shows no such collapse across a thousand years of continuous occupation.

What hunter-gatherers were capable of

Taken together, the findings point to something far more sophisticated than isolated, one-off voyages of discovery.

“Our study proves that Malta was part of a hitherto unknown, sustained, long-distance sea voyaging network,” Scerri said.

“The last European hunter-gatherers were not only reconfiguring the use of land and sea in a way that preempts the modern world, they were also maintaining social networks in ways we don’t see before.”

That reframing carries real weight for how archaeologists understand this period of prehistory more broadly.

The traditional understanding of Mesolithic hunter-gatherer societies as small, isolated bands tied closely to a single stretch of coastline does not seem to hold.

The findings suggest at least some of these communities were maintaining organized maritime networks capable of supporting repeated, purposeful journeys across open water.

The birth of modern Man

https://chuckincardinal.blogspot.com/

'Completely Transformed My Understanding': Scientists Uncover Hundreds of Hidden Structures Beneath The Amazon

30 July 2026, By M. Starr

https://www.sciencealert.com/completely-transformed-my-understanding-scientists-uncover-hundreds-of-hidden-structures-beneath-the-amazon

LIDAR image of the Aquiry geoglyph site at Piloto. 

(© Martti Pärssinen and Fabio de Novaes, supplied)

Today, the Amazon rainforest is revered as one of Earth's most immaculate wildernesses.

Nearly 2,000 years ago, it looked very different.

Between around 600 BCE and 850 CE, a civilization known as the Aquiry transformed swaths of southwestern Amazonia, carving enigmatic geometric earthworks into the landscape.

Now, a new LIDAR survey suggests that civilization was even larger than archaeologists imagined, hinting at a people that built as many as 30,000 earthworks and had a peak population of up to 3 million people around 200 CE.

For archaeo-anthropologist Martti Pärssinen of the University of Helsinki, the realization was transformative.

"I first experienced such a moment in 2002, when I flew with Alceu Ranzi and Sanna Saunaluoma over the monumental geometric earthworks and observed ancient roads connecting the sites in the state of Acre, Brazil, a region that had long been regarded as pristine rainforest," Pärssinen told ScienceAlert.

"It completely transformed my understanding and made me realize how mistaken earlier assumptions had been.

"More recently, I felt something similar when I came to understand that there may actually be up to ten times more of these earthworks in the region than I had previously imagined."

Aerial photo of earthworks at the Tequinho site in Acre, Brazil. The Aquiry culture is named for the word Indigenous peoples used for the Acre River, which flows from Peru and Bolivia to Acre, passing through the heart of the ancient civilization. 

(Martti Pärssinen, supplied)



The Aquiry civilization wasn't a single kingdom or empire, but a diverse network of communities connected by shared traditions.

We don't know much about them – they left no written records, and their dwellings are long gone.

What we do have are their monumental earthworks: geometric spaces delineated by ditches that could be meters deep, linked together by straight roads, where people may have gathered for ceremonies and political events.

Today, the geometric earthworks and the ecological legacy of their land management are among the few visible traces the Aquiry left behind.

"The scale of the archaeological record suggests that many other regions across Amazonia may have been far more densely populated and intensively modified than previously assumed." – archaeo-anthropologist Martti Pärssinen

In the centuries since their disappearance around 850 CE, the rainforest reclaimed much of what the Aquiry built. Hints of their structures emerged during land clearing, but the full scale remained lost beneath the trees.

LIDAR technology changed everything.

The technology fires laser pulses from an aircraft. Some penetrate gaps in the forest canopy and bounce off the ground, allowing researchers to reconstruct the hidden landscape beneath without disturbing the rainforest.

LIDAR images of earthworks. 

(Pärssinen et al., Nature, 2026)

The researchers surveyed 4,497 square kilometers (1,736 square miles) of rainforest by flying a series of long, roughly 450-kilometer (280-mile) transects over the region.

Their entire dataset yielded 432 earthworks – 396 of which were previously unknown.

"What surprised us most was the extraordinarily large number of geoglyphs and other earthworks found within an area representing less than 3 percent of Greater Amazonia," Pärssinen said.

"The scale of the archaeological record suggests that many other regions across Amazonia may have been far more densely populated and intensively modified than previously assumed."

By extrapolating their results, combined with existing surveys, the researchers estimated that, at its peak, the Aquiry civilization may have covered an area as large as 183,000 square kilometers.

This space could have supported a population of around 1.2 to 3 million people, in a landscape with as many as 24,000 to 30,000 earthworks, the researchers estimated.

It would have been a dramatically different place than the wilderness we see today – a forest threaded with clearings where people lived, farmed, celebrated, and gathered.

"At the center of many of these clearings would stand large geometric earthworks connected by broad and narrow roads," Pärssinen told ScienceAlert when asked what the landscape might have looked like around 200 CE.

"At certain times of the year, these places would come alive with ceremonies, gatherings, music, dancing, athletic competitions, and other communal events."

Aerial photo of earthworks at Piloto. 

(Martti Pärssinen, supplied)



With LIDAR uncovering the histories of many ancient societies in the Amazon, Pärssinen said the traditional view of the rainforest as an untouched wilderness should be "abandoned".

Instead, the new findings recast the Amazon as a rainforest shaped in many places by large human populations.

In their heyday, the Aquiry earthworks we see today would have likely been surrounded by "large wooden longhouses inhabited by substantial populations, alongside fields of maize, manioc, squash, and cotton," Pärssinen said.

"In the nearby forests, there would likely be an abundance of managed fruit- and nut-bearing trees, reflecting centuries of human stewardship of the landscape."

The discovery paints the clearest picture yet of the mysterious Aquiry and how they populated southwestern Amazonia for some 1,500 years. Much of their story, however, is still waiting to be told.

"Many questions remain unanswered," Pärssinen said.

"One of the most important is what happened between approximately [CE] 850 and 1000. Why did this civilization disappear?"

The birth of modern Man

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Scientists Discover a Vagus Nerve Signal That Links Food Directly to Memory Formation

29 July 2026. By J. COCKERILL

https://www.sciencealert.com/what-you-eat-may-trigger-gut-brain-signals-that-shape-how-memories-form

Food plays an important role in many important moments in our lives, whether it's grand occasions, like the wedding banquet, or smaller ones, like the weekend barbecue, the lunch date, or the family dinner time.

A new study suggests good food might be more than a mere accessory to those special occasions: it might even directly boost the brain's memory-making machinery, helping to store away those important memories.

Biologist Scott Kanoski, of the University of Southern California, led a study recently published in Nature Communications that suggests food can quite literally impact the formation of memory, via a chain of nerve signaling.

In a series of rat experiments, Kanoski and team discovered that after a nutritious meal, a signal is sent up the vagus nerve, from the gut to the brain.

That signal reaches neurons in the medial septum, a brain region that impacts activity in the hippocampus.

Scientists already knew that memories are encoded in the hippocampus when medial septum neurons release a neurotransmitter called acetylcholine.

https://www.youtube.com/watch?v=EVVOdfEdQl0

But they didn't know that what was going on in the gut – as 'reported' to the brain by the vagus nerve – could impact acetylcholine release all the way up in the medial septum.

It turns out that, at least in rats, memory-making is very much influenced by what's going on in the gut.

The researchers used fiber photometry to watch the activity of certain brain cells as rats were fed different diets. In one experiment, some rats were given a solution with fat or sugar, while others were given a similarly sweet-tasting solution that was low-calorie or contained no calories at all.

The animals that ate fats and sugars had stronger memory-related activity in their brains, even after eating. This suggests that consuming calories, not the act of eating or the taste of food, is what affects this gut-brain chain of memory signaling.

Based on their experiments, the researchers propose a model for nutrient-induced modulation of hippocampal function.

 (Tierno Lauer et al., Nat. Commun., 2026)

"Eating behavior dynamically increases hippocampus acetylcholine release, and these levels remain elevated after a meal," Kanoski and team write.

"These effects are eliminated by either vagal afferent neuron ablation or medial septum acetylcholine neuron deletion."

In other words, when the researchers tampered with the lines of communication, this specific relationship between food and acetylcholine release disappeared.

"We think the mechanism likely evolved to help animals remember vital information about food sources," says first author of the study, biologist Logan Lauer.

And yet, high-fat and high-calorie diets didn't always translate to better memory.

When rats were given a Western 'junk food' diet of high-fat, high-sugar chow along with potato chips, peanut butter cups, and high-fructose corn syrup early in life, this specific acetylcholine signaling system was weakened.

Even when they were fed healthier foods again later in life, they struggled with memory tasks.

Food plays an important role in many significant moments in our lives. 

(PBNJ Productions/Tetra images/Getty Images)



Just because something works a certain way in a rat doesn't mean it will be the same in a human, although as mammals, our shared evolutionary history means there is often a fair bit of overlap.

Also, the study was conducted only in male rats, which makes its findings even less broadly applicable.

With further research to address those limitations, these findings could be useful in finding ways to improve gut-brain signaling in humans.

https://www.youtube.com/watch?v=6WFhhL-enlQ

"The disruption of acetylcholine signaling in the hippocampus is one of the earliest neurochemical changes in Alzheimer's disease," says Kanoski.

"By revealing that this system is boosted by gut signaling from the vagus nerve, novel therapeutic targets could leverage this information to explore vagus nerve-based approaches, such as vagus nerve stimulation."

Sometimes called a 'pacemaker for the brain', vagus nerve stimulation can provide lasting benefits for many people with depression and is an approved treatment for epilepsy and stroke rehabilitation.

It remains to be seen whether the treatment could also affect memory-making in humans; trials are underway, and a handful of studies suggest it may prevent memory from worsening in early-stage Alzheimer's, or even improve it.

The Life of Earth

https://chuckincardinal.blogspot.com/

Dracula Orchid: The Gothic-Looking Flower That Poachers Can't Get Enough of

28 July 2026, By F. MACDONALD

https://www.sciencealert.com/the-dracula-orchid-that-wildlife-traders-just-wont-leave-alone

(Will H/500px/Getty Images)

In the misty cloud forests of the Andes, there's one particular genus that wildlife traders can't get enough of.

It's not a primate or reptile – no, the target is something subtler and a little spookier: dracula orchids.

They look and sound like they should be named for blood.

But the genus actually takes its name from the Latin for "little dragon", thanks to their long, dark, fang-like sepals.

When the first species was taken from Colombia's Western Andes in 1871, 19th-century botanists described the flowers as "grotesque and whimsical," provoking what one called "irresistible attraction."

Orchid hunters started shipping them to European greenhouses almost immediately.

That attraction never really faded.

The orchids are viral online not only for their spooky name and gothic appearance, but because they seem to resemble a 'monkey face' in their sepals.

Dracula simia. 

(Dick Culbert/Wikimedia, CC BY 2.0)



Many enthusiasts and professional growers trade in cultivated plants responsibly, but others still seek wild orchids, and Dracula species are no exception. For a plant that may exist in populations of just a few dozen individuals, a single collecting trip can be disastrous.

"What's striking about Dracula orchids is the contrast between their huge online popularity and the almost complete lack of knowledge we have about their conservation status," Diogo Veríssimo, from the University of Oxford's Environmental Change Institute wrote last year.

He was part of an assessment that revealed almost 70 percent of the genus's 133 species were threatened with extinction.

"We often assume that species we see widely shared on social media must be well studied, but for these orchids, that's far from true. Their viral fame hasn't translated into understanding or protection, and that's what makes the new assessment so urgent," said Veríssimo.

Nearly all of the known Dracula orchid species are epiphytes clinging to trees in the cloud forests of the Andes, mostly in Colombia and Ecuador.

Mindo Cloud Forest, Ecuador. 

(Esteban Alejandro/iStock/Getty Images Plus)



A massive 69 percent of the genus are known from fewer than six locations anywhere on Earth. Some exist in a single valley.

A new study in Biological Conservation has now tracked exactly what's happened to that "irresistible attraction" over four decades of formal trade records.

It found that 121 of the genus's 133 species – 91 percent – have been legally, internationally traded since 1981.

That's over 112,000 individual plants, moving through 25 exporting and 52 importing countries.

Nearly half of that trade – 49 percent – came from countries where the species doesn't even grow.

The single biggest shipment in the whole 42-year record was 4,650 plants of Dracula cordobae, a species found nowhere on Earth except Ecuador, sent from Taiwan to Belgium in 2004.

Every one of those 112,000-plus plants was officially logged as artificially propagated. Not one, in over four decades of records, was ever declared as taken from the wild.

The researchers aren't sure that can fully be trusted.

"For newly described or recently discovered species, key life-history traits such as longevity are often unknown or lack empirical scientific evidence," the team, led by orchidologist Edicson Parra-Sánchez from the University of Cambridge in the UK, wrote in their paper.

"This uncertainty complicates the determination of propagation status and may increase the risk of wild-sourced individuals being misclassified as artificially propagated."

A real Dracula orchid, left, is shown alongside a 3D-printed orchid used in a 2016 experiment to work out how the orchids lure in pollinating flies. 

(Aleah Davis, University of Oregon)

In fact, 89 percent of all Dracula species were originally described to science using plants that were already sitting in nurseries – not documented wild populations.

Many of those founding plants were outside the orchid's native country altogether, overwhelmingly in the United States. Only 7 percent of species were ever formally described from confirmed wild plants.

In other words, by the time science had a name for many of these orchids, they were already for sale. Which is a little suspicious.

Across the genus, the median time between a species' formal scientific description and its first appearance in commercial trade was 8 years – dropping to 5 for species described after 1981.

Eighteen percent of species entered trade within two years of being named.

One, D. fuligifera, was already being exported a full year before it was formally described at all.

D. anthracina is known from a single forest patch, home to just 17 recorded adult plants. It has been in international trade since the year it was discovered.

Around 10 percent of all recorded Dracula trade – more than 11,000 plants – was logged only as "Dracula sp.," with no species name attached at all, obscuring exactly what was bought and sold.

The researchers also found individual mix-ups hiding in the official record: one species mislabelled in a 2013 shipment, another traded for years under a name later corrected by taxonomists, and two naturally occurring hybrids exported and recorded as if they were full species.

Dracula is currently listed under CITES Appendix II, which allows regulated trade with permits.

The study's authors argue that's not enough, and are calling for the genus to be upgraded to Appendix I, which prohibits international trade for commercial purposes.

"Our results indicate that listing the genus in CITES Appendix I may be necessary to prevent further erosion of evolutionary history," the researchers write.

That higher level of protection will force a little more time between species being discovered and entering trade.

Not every Dracula species has even made it that far.

Three are still so rare that they barely exist outside a research paper. D. irmelinae has known wild populations but has never been recorded in cultivation.

D. inexperata has only ever been grown at the single site where it was first found.

D. fafnir hasn't been seen by anyone, in the wild or otherwise, since the day it was formally described.

The Life of Earth

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Scientists Reveal The Simple Change That Could Save Millions of Insects

29 July 2026, By J. Cockerill

https://www.sciencealert.com/a-simple-lighting-swap-could-save-millions-of-insects

(0802290022/iStock/Getty Images Plus)

Forty percent of the world's insect species are at risk of extinction in the coming decades, mainly because of habitat loss, pollution, pathogens, introduced species, and climate change.

Artificial light at night is included among those stressors, because it disrupts the natural behaviors of insects.

More than 60 percent of invertebrates are nocturnal, so any artificial light within their habitat is going to affect them during their most active hours.

It's a widespread problem: all around the world, vivid sodium and LED lights cast our surroundings in permanent light, mainly in the name of human safety, along roads, footpaths, railways, shopping strips, and almost anywhere else in the built environment.

https://www.youtube.com/watch?v=eKZaFUlKS4A

But according to a team led by researchers at the Leibniz Institute for the Analysis of Biodiversity Change in Germany, there might be a simple way to keep insects a little safer, without compromising human needs.

"It is estimated that around one billion insects are affected every summer night in Germany, often dying from artificial light sources," the researchers explain.

Insects can respond to artificial light in a few ways.

Moths, of course, are renowned lamp-lovers, helplessly attracted to the light.

Some estimates suggest that one third of insects attracted to stationary artificial light sources, like the humble moth, will die before the morning comes, either due to exhaustion or predation.

Other insects, like New Zealand's weta, are known to avoid artificial light at night, meaning that permanently-illuminated areas (and all the resources within) become unavailable to them as habitat.

"The global increase in light pollution and the brightening of the night sky in recent decades therefore pose major threats to insect diversity and are of growing importance for national and international nature conservation," the Leibniz Institute team says.

What they've found is that if we're going to use artificial lights all night, the kind of light can make a big difference for insects.

They designed a study carried out at six different railway platforms – sites where the lights are often kept on all through the night, although they are within the Westhavelland Nature Park, a designated dark sky reserve.

The kinds of light we use at night could make a huge difference for the insects that live alongside us. (Ludreschl et al., Biol. Conserv., 2026)



Before the experiment, all these stations were lit up by a series of warm white 2000 Kelvin (K) high-pressure sodium (HPS) lamps.

These are more expensive to run than LEDs, which is why in many parts of the world you'll notice the warm glow of sodium lights has been swapped out for their more energy-efficient counterparts.

To get a sense of the impact different kinds of night lighting have on insects, the researchers kept two adjacent HPS lamps and replaced the globes in two other pairs of lamps: one pair with cool white 4000 K LEDs, and one pair with amber 1800 K LEDs.

They also monitored two extra control sites nearby, where no lights were installed, to get a sense of normal insect behavior outside of illuminated zones.

Emission spectra of the tested light sources, measured using a spectroradiometer.

 (Ludreschl et al., Biol. Conserv., 2026)



To measure the kinds, numbers, and volume of insects who were active at these sites, the researchers used traps to catch samples from July to October in 2023, and April to June in 2024, and analyzed these samples using AI-based image analysis and DNA metabarcoding.

"Our results indicate that insect attraction by outdoor lighting and possible population declines can be reduced through optimized light sources," they report.

"Amber LED lights (1800 K) with low blue light content attracted significantly fewer individuals and species, as well as threatened and legally protected taxa than conventional cool white LEDs (4000 K) and high-pressure sodium lights (2000 K)."

"This reduced attraction is primarily driven by the narrow spectral composition and the absence of short-wavelength blue light in the 1800 K LED."

Based on these findings, all of the railway platform lights in Westhavelland Dark Sky Reserve have already been replaced with 1800 K LEDs.

While this research was conducted at railway platforms, the implications are far-reaching.

Similar effects could be achieved with streetlights, garden lights, along footpaths, and in parks, in an effort to protect insect biodiversity.

Not all insects react to light in the same ways, so this strategy might not help all species equally. The study only focused on nocturnal flying arthropods, so it's unclear what effects these experiments might've had on ground-dwelling species, for instance.

And while attraction to light can mean death for many kinds of insects, the authors also note that their measured variable – lower observed attraction to light – may not necessarily mean that the 1800 K LED addresses all the potential ecological consequences of artificial light.

"Further studies at the species level are essential to improve understanding of taxon-specific responses to artificial light at night, particularly for threatened or legally protected species," they note.

Nonetheless, it's a good place to start in making our world a little more insect-friendly, even with just a trip to the hardware store.

The Life of Earth

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