Why are super-recognisers so good at learning and remembering faces?

Source: The Conversation – UK – By Robin Kramer, Senior Lecturer in the School of Psychology, University of Lincoln

Nazarii Ortynskyi/Shutterstock

Some people are so good with faces that there’s a name for them – super-recognisers. And a new study using eye-tracking technology has given us some insights into how they do it.

Although most of us perform reasonably well when tasked with learning a new person’s face or recognising someone we already know, there are people whose abilities are at the extremes. Those who struggle with faces (even of close friends and family) are known as prosopagnosic or face blind. Some people are born with this difficulty, while others may develop it later in life as a result of a stroke or injury.

In contrast, super-recognisers naturally excel at recognising faces. Studies also show they may be better than most of us when deciding whether images of unfamiliar people depict the same individual (like comparing a stranger to their ID photo), and that this ability may even extend to voices.

The new study suggests the direction of super-recognisers’ gaze when learning a face is important in explaining why they perform so well.

What do super-recognisers do differently?

Since super-recognisers are outstanding at recognising faces, it is interesting and potentially useful to discover what they do differently to the rest of us.

Previous research has shown these people look at faces in a different way when learning them. They make more fixations (stop and focus on more points) while spending less time on the eye region, compared with the average viewer. Their attention is spread more broadly, sampling more information across the face as a whole.

Also, their style of responding differs from those who are highly trained (over many years) in matching face images, tending to place more confidence in their decisions (both when correct and incorrect) and responding faster.

Evidence suggests super-recognisers’ face recognition skills are likely to have a strong genetic basis, perhaps explaining why attempts to improve average people’s abilities through short periods of training have generally failed.

What eye-tracking data reveals

Since we know super-recognisers look at faces differently to the average person, researchers in Australia decided to investigate whether this might explain their superior performance levels.

They used eye-tracking data collected in 2022 for a previous study from 37 super-recognisers (identified based on their scores across several face perception tests) and 68 typical viewers, to reconstruct exactly what these participants were looking at when learning new faces.

A person stands in front of a gradient background, featuring a facial recognition overlay.
Super-recognisers stop and focus on more points as they learn a new face, while spending less time on the eye region.
Prostock-studio/Shutterstock

They viewed the faces through a simulated “spotlight” (see it here) which moved with their gaze as they explored the face. This meant the researchers could be sure of what information the participant could see during viewing.

Next, all of the regions a participant viewed were combined to create a composite image. This composite was then compared with a full, original image of either the same person (but showing a different facial expression) or a different person (with similar demographic characteristics). High similarity to images of the same person, and low similarity to different people, would mean the composite contained useful identity information.

The researchers’ analyses showed that super-recognisers accessed more valuable information, which resulted in better discrimination between “same person” and “different people” image pairs when compared with typical participants.

After accounting for the fact that super-recognisers simply took in more information than typical viewers, the results showed that the quality of their information was still higher.

More extensive exploration of faces

The researchers suggest that more extensive exploration of faces during learning could help super-recognisers in discovering the most useful features for identification. This may lead to better-formed internal representations of each learned face.

Since super-recognisers look at faces differently to the rest of us from the very earliest stages of viewing, it’s very difficult to train people to match their natural ability. However, forensic facial examiners (professionals whose job involves face comparisons) show it is possible.

They have been found to perform just as well as super-recognisers when comparing pairs of unfamiliar images, presumably due to the extensive and lengthy training and mentoring that they receive – in particular focusing on useful features in the images like the ears and any facial marks.

So there may actually be two types of face experts: those with natural ability (super-recognisers) and those with extensive training (facial examiners). But examiners might choose to pursue this particular career because of an innate ability, so further investigation is needed.

Although the existence of people with exceptional face abilities has been known for nearly two decades, researchers are still trying to understand what makes them excel. As this new study demonstrates, the way super-recognisers (and the rest of us) look at faces as we learn them could play a crucial role in how good – or bad – we are at recognising people in our daily lives.

The Conversation

Robin Kramer does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Why are super-recognisers so good at learning and remembering faces? – https://theconversation.com/why-are-super-recognisers-so-good-at-learning-and-remembering-faces-269296

The truth about Vikings and mead might disappoint modern enthusiasts

Source: The Conversation – UK – By Simon Trafford, Lecturer in Medieval History, School of Advanced Study, University of London

Brambilla Simone/Shutterstock

A group of friends sit around a table sharing stories and sipping mead. The men sport beards and the women sip from drinking horns – but these aren’t Vikings, they’re modern-day hipsters.

The 21st century has seen a revival of mead, a fermented alcoholic drink made from water and honey. In the past 20 years or so, hundreds of new meaderies have sprung up around the world.

These meaderies often draw on Viking imagery in their branding. Their wares are called things like Odin’s Mead or Viking Blod and their logos include longships, axes, ravens and drinking horns. A few even have their own themed Viking drinking halls. This is part of what might be called the “Viking turn”, the renewed pop culture vogue for the Vikings in the past 20 years, which has made them the stars of a rash of films, TV shows, video games and memes.

Since the rowdy banquet scene in the 1958 film The Vikings, wild, boozy feasting has been a staple of the hyper-masculine pop culture Viking. This theme continues in the 21st century, from the History Channel’s Vikings TV series (2013-present) to games like Skyrim (2011) and Assassin’s Creed: Valhalla (2020).

But while modern media suggest that Vikings drank mead as often as water, history tells a slightly different story.

The banquet scene from The Vikings (1958).

Three stories are foundational for the Viking association with mead. The first is the Anglo-Saxon poem Beowulf, which survives in a single manuscript written in Old English and now in the British Library.

The story it tells is set in southern Sweden and Denmark in the early 6th century, so the warrior culture and lifestyle that Beowulf idealises are actually of a period considerably earlier than the Viking age (usually dated from the later 8th century onward). It does share a great deal of its substance with later Viking notions of the good life and so, for good or ill, they have tended to be conflated.

Most of Beowulf’s action plays out around mead-halls – the power centres of lords such as the Danish king Hrothgar, where the leader would entertain his followers with feasts and drinking in return for their support and military service. This relationship, based upon the consumption of food and drink, but inextricably bound up with honour and loyalty, is the basis of the heroic warrior society that is celebrated by the poet. Not surprisingly, therefore, episodes in which mead is drunk are frequent and clearly emotionally loaded.

A second high-profile appearance of mead comes in Norse mythology. At the god Odin’s great hall, Valhöll, the Einherjar – the most heroic and honoured warriors slain in battle – feast and drink. They consume the unending mead that flows from the udders of a goat named Heiðrún who lives on the roof. Norse myth, it should be noted, is sometimes quite odd.

illustration of a bird excreting mead
Odin excreting mead in the form of an eagle, from an Icelandic 18th century manuscript.
Det Kongelige Bibliotek

Lastly, another important myth tells of Odin’s theft of the “mead of poetry”. This substance was created by two dwarves from honey and the blood of a being named Kvasir, whom they had murdered. The mead bestows gifts of wisdom and poetic skill upon those who drink it.

The whole myth is long and complicated, but it culminates with Odin swallowing the mead and escaping in the form of an eagle, only to excrete some of it backwards when he is especially hotly pursued.

These are striking and impressive episodes that clearly demonstrate the symbolic and cultural significance of mead in mythology and stories about heroes of the Viking age. But that is far from proof that it was actually consumed on a significant scale in England or Scandinavia.

As far back as the 1970s, the philologist Christine Fell noted that Old English medu, (mead), and compound words derived from it appear far more frequently in strongly emotive and poetic contexts such as Beowulf than in practical ones such as laws or charters.

This contrasts strongly with the pattern of usage of other words for alcohol such as ealu (ale), beor (counter intuitively probably “cider”) or win (wine), which are far more frequently used in a functional and practical way. This led Fell to believe that the concentration on mead in the likes of Beowulf was a “nostalgic fiction”. Mead, she concluded, was a fundamental part of an idealised and backwards-looking imagined heroic world rather than something customarily drunk in the course of everyday life.

In 2007, a PhD candidate at the University of York demonstrated the same point in the Scandinavian sources: mjǫðr (“mead”) is far more common in the corpus of Eddic and skaldic poetry than it is in the saga stories of everyday life. Equally, both the word mjǫðr and compound words derived from it are used far less frequently in the sort of practical and purposeful contexts in which ǫl and mungát (the Old Norse words for ale) are plentiful.

Drinking horns on display at a Viking-themed pub in York.
Drinking horns on display at a Viking-themed pub in York.
Author provided, CC BY

The strong impression in both England and Scandinavia is that, by the time sources like Beowulf were written from the 10th century onward, the plentiful drinking of mead by a lord’s retinue was largely symbolic. It represented the contractual bonds of honour in an idealised warrior society.

This was more a poetic image than a reflection of frequent real-life practice. The standard drink at feasts, let alone at normal everyday household meals, was far more likely to be ale.

Mead was once a highly prized drink – probably the most desirable beverage well before the Viking age, as its honoured place in Valhöll and Hrothgar’s hall suggests. However, honey’s scarcity made mead expensive and hard to source in northern Europe. By the Viking age, exotic Mediterranean wine, mentioned as Odin’s drink in the Grímnismál, may have begun to replace mead as the elite’s preferred choice.

So what, then, for modern mead-drinking Viking enthusiasts? The point is not, of course, that Vikings or any other early medieval people never drank mead – some clearly did, if not perhaps quite so often as is sometimes alleged – but rather that it served more as a symbol of a story-filled heroic neverland. But that is arguably exactly how many of today’s mead-drinkers also use it.


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The Conversation

Simon Trafford does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. The truth about Vikings and mead might disappoint modern enthusiasts – https://theconversation.com/the-truth-about-vikings-and-mead-might-disappoint-modern-enthusiasts-267902

How climate cooperation turned into a global race for green power

Source: The Conversation – UK – By Rahmat Poudineh, Honorary Research Associate, Oxford Sustainable Finance Group, University of Oxford

shutterstock Piyaset / shutterstock

Nearly a decade after the Paris agreement, the world is emitting more greenhouse gases than ever. Global emissions reached a record 53 billion tonnes in 2024 – about 10% higher than in 2015, when the deal was signed. Despite near-universal participation, the international effort to cut emissions is failing.

The Paris system, built on voluntary pledges, has turned into more of a reporting exercise than a coordination mechanism.

Even if all countries’ pledges were fully implemented, global emissions would be only 2.6% lower than 2019 levels by 2030 (versus 43% required).

Paris succeeded in creating a shared language of ambition and reporting, but not in enforcing collective compliance. It now functions less as a steering mechanism and more as a global scoreboard, showing who is ahead or behind. The absence of binding rules made universal participation possible – but also removed incentives to stay on course.

Emissions within acceptable limits

The world is entering the age of “managed emissions” – an era of containment, not cure. Instead of eliminating greenhouse gases, governments are learning to live with them, keeping pollution within politically acceptable limits.

Deep decarbonisation is being pushed further into the future, perhaps the 2060s or 2070s. Each revision of global scenarios quietly redefines delay as progress.

Car traffic from above
To be managed – not eliminated.
JKVisuals / shutterstock

Climate policy as industrial strategy

The erosion of cooperation hasn’t led to inaction. Instead, it has sparked a new kind of race: competitive decarbonisation.

Major economies are cutting emissions mainly to strengthen energy security, secure industrial advantage, and expand geopolitical influence. Clean-energy investment reached around US$2.2 trillion in 2024, mostly concentrated in China, the EU, and North America. Climate action is now shaped more by a desire to promote key industries than by multilateral coordination.

A new industrial climate regime has emerged where success is measured by national market share in clean technologies, not by collective progress toward global goals.

This shift is also geopolitical. The rivalry between the US and China has spilled into climate policy, with each using green leadership to project influence and set global standards. Competition over clean technologies has encouraged export restrictions and trade disputes, stifling open collaboration.

The race for critical minerals adds another layer. These resources are essential for renewable technologies, and nations are moving from cooperation to resource nationalism, securing supplies by forming strategic partnerships and investing heavily in domestic mining.

At home, governments are tailoring climate policies to domestic interests. Action on climate is now tied to industrial jobs, competitiveness, and voter expectations.

Protecting economies, not the planet

To prevent “carbon leakage” – where companies relocate to countries with weaker rules – rich nations are introducing trade measures such as carbon border adjustments. These policies aim to protect national industries while maintaining environmental standards, but they also risk deepening global divides.

Developing countries argue that wealthy nations have failed to deliver on climate finance and technology transfer, promises central to the Paris deal. The result is an erosion of trust: poorer countries see a system that benefits the industrialised world while restricting their own growth.

These trends reveal something deeper than a shortfall in ambition. They expose an illusion of control. Despite record investment, global emissions continue to rise because today’s governance tools no longer match the scale and complexity of the energy system. The world is not defying Paris by choice, but by design – through a framework relying on voluntary pledges in a fiercely competitive global economy.

This is not necessarily a story of failure. The shift from cooperation to competition has unleashed investment, innovation and the deployment of clean technologies. Yet without global alignment, progress is uneven at best.

The challenge ahead is not only technological but moral: can global governance resist the comfort of incremental progress? Can it reclaim a sense of shared direction?

If “managed emissions” become the accepted destination, humanity may master adaptation yet forfeit transformation. At the UN’s Cop30 climate summit, the task is not merely to promise more – but to recover belief in collective action before it quietly disappears.

The Conversation

Rahmat Poudineh is head of electricity research at the Oxford Institute for Energy Studies (OIES). OIES is an independent and autonomous energy research institute based at Oxford.

ref. How climate cooperation turned into a global race for green power – https://theconversation.com/how-climate-cooperation-turned-into-a-global-race-for-green-power-268768

The hidden environmental cost of anti-wrinkle injections

Source: The Conversation – UK – By Bridget Storrie, Teaching Fellow, Institute for Global Prosperity, UCL

marevgenna/Shutterstock

The increasing number of injectable cosmetic treatments and fillers carried out around the world is driven by a seemingly universal need to look younger than we are. Most are administered to women, but a growing number of men are having them too.

This beauty-is-youth belief has a geological cost. Over 14 million stainless steel hypodermic needles are used and discarded annually for cosmetic treatments around the world. The metals used to create them are considered critical.

Stainless steel is an iron and chromium alloy with nickel added to most of it. The iron in a needle might have come from the Pilbara in Western Australia. It was born over a billion years ago when oxygen from the photosynthesis of early bacteria combined with iron in the ancient oceans and settled on the sea floor.

The chromium could have come from the Bushveld Complex in South Africa, an igneous intrusion created when magma found its way to the Earth’s crust through vertical cracks, then cooled, allowing the chromite to differentiate itself, crystallising in distinct layers.




Read more:
The importance of critical minerals should not condone their extraction at all costs


And then there’s the nickel. Like chromite, it began its life in the upwelling and cooling of magma associated with the formation of the continents as we know them now, and through the weathering of igneous rocks. It’s likely to have come from Indonesia, where deposits of nickel are close to the surface and economical to extract.

A critical mineral is one that is considered essential for a state’s economy, national security and clean energy technologies, and has a supply chain vulnerable to disruption by war, tariffs and scarcity. Critical minerals cannot easily be replaced by something else.

woman's face, injection near lips with gloved hand of medical professional
The needles used to perform injectable cosmetic surgey are made using various critical minerals.
fast-stock/Shutterstock

The critical list

What is on a particular country’s critical minerals list says something about the geopolitics of the places where commodities are mined, the characteristics of the commodity itself and the priorities of the country compiling the list.

Chromium is considered critical by the US, Canada and Australia because it is essential for stainless steel production and other high-performance alloys. Demand for chromium is expected to grow by 75 times between 2020 and 2040 due, in part, to the clean energy transition. Reserves are concentrated, with South Africa producing over 40% of supply in 2023, followed by Kazakhstan, Turkey, India and Finland.

Nickel was added to the UK’s critical mineral list in 2024. Described as the “Swiss army knife” of energy transition minerals, it is used to increase energy density in lithium batteries, allowing for their miniaturisation and increasing the range in electric cars. Indonesia holds 42% of the world’s reserves.




Read more:
The global race is on to secure critical minerals. Why do they matter so much?


Even iron ore is on the list. High-quality iron ore was put on Canada’s critical minerals list in 2024 because of its importance for “green steel” production and decarbonisation goals.

The rapidly increasing demand for stainless steel for cosmetic purposes is tangled up with urgent demands from other sectors. It is essential for construction, transportation, food production and storage, medicine and the manufacture of consumer goods.

It is vital for defence. Stainless steel is used in aircraft and vehicle components, naval vessels, missile parts and ballistics.

Needles used in cosmetic procedures are also entangled with other resource-related issues that have no easy answer: mining-related conflict, concerns about the environmental and social impact of mining and controversy over new mining frontiers, like the deep seabed and the Moon.

Then there is the carbon footprint of the multiple processes required to turn rocks into needles and disposing of them safely. Each one has to be mined, shipped, smelted, manufactured, trucked, used, put in a sharps bin and then incinerated.

Do we have to choose between cosmetic procedures or the green transition? Cosmetic procedures or defence? No. Our increasing demand for injectable cosmetic procedures isn’t responsible for making chromium, nickel and iron ore critical. But it’s part of that story and it comes with a cost.


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The Conversation

Bridget Storrie is a director of Storrie Consulting, a mining and minerals consultancy

ref. The hidden environmental cost of anti-wrinkle injections – https://theconversation.com/the-hidden-environmental-cost-of-anti-wrinkle-injections-266926

Tesla’s US$1 trillion gamble on Elon Musk’s ‘visionary’ leadership

Source: The Conversation – UK – By Sverre Spoelstra, Professor, Lund University

Photo Agency/Shutterstock

Tesla has announced it is offering its CEO Elon Musk a performance-based pay package worth US$1 trillion. That’s right: 12 zeros.

To put this figure in perspective, it is double the amount of Musk’s existing fortune of US$500 billion (£380 billion) and equal to the GDP of Switzerland.

There are, of course, strings attached. The compensation will be be paid out in new shares on the condition that the company meets some ambitious goals within the next decade. Still, US$1 trillion is an absurd amount of money – even for someone who is already the richest person in the world.

So how do we make sense of it?

Tesla’s chair of the board Robyn Denholm warned shareholders that Musk might walk away from the company if they didn’t approve the unprecedented pay package. Shareholder confidence was no doubt buoyed by the recent rise in Tesla’s stock, with one investor describing Musk as “key” to the entire enterprise.

But what the chair of the board didn’t mention was that Tesla’s sales (and stock price) had plummeted earlier this year, thought to be largely due to Musk’s cost-slashing activities at the US department of government efficiency (Doge). After Musk stepped back from the Trump administration, Tesla’s share price rebounded.

protester outside a tesla branch holds up a sign reading 'sell your stock'
Tesla’s value fell after Musk led the US government’s efficiency cuts.
Christopher Penler/Shutterstock

So why award him this record-breaking pay plan? According to Tesla’s board, the package is meant to “incentivise” Musk to propel the company to new heights. In other words, Musk will aspire to achieve more if he is paid more.

This explanation rests on the longstanding myth of the “economic man” – the idea that humans are primarily motivated by financial gain. But behavioural economists such as Daniel Kahneman and Dan Ariely have long since debunked this. Humans often act in weird, irrational ways that don’t always make economic sense. They make decisions based on habits and emotions rather than careful calculation.

The figure of homo economicus offers only a partial account of human behaviour at best, and a misrepresentation of reality at worst. And what’s a few hundred billion dollars more to a man with a personal wealth that is already on a par with the total value of energy giant ExxonMobil?

To understand excessive executive pay, forget the rational “economic man”. In management studies, there’s a theory called the “the romance of leadership”. It tells us that people grossly overestimate the influence of leaders on organisations.

In his classic account of charismatic leadership, German sociologist Max Weber notes that people tend to attribute “extraordinary” qualities to certain individuals, making them appear capable of feats that are far beyond the reach of ordinary people. They become larger than life, at least to those who are in their circle of influence.

The deeds of charismatic leaders are rarely viewed by their followers in a clear-eyed way. As if blinded by their charisma, people tend to exaggerate the leader’s efficacy and ignore their shortcomings.

A typical product engineer at Tesla earns around US$115,000 a year, plus stock options. Musk’s pay package is several million times larger than the average salary at his own company. It’s enough to buy a Rolls-Royce Droptail – one of the world’s most expensive cars at around £25 million – every day for 90 years.

Only a true believer, someone with faith in the power of leadership, could think this is a good idea.

product image of a red rolls-royce droptail car.
A Rolls-Royce La Rose Noire Droptail – one of the world’s most expensive cars.
Rolls-Royce Motor Cars

Other companies are following Tesla’s lead. EV company Rivian recently awarded its CEO RJ Scaringe performance-based stock options that could exceed US$4 billion dollars. Small change for Elon, but probably a big deal for RJ.

In the case of Tesla, Musk is portrayed as a “visionary” leader, despite recent controversies. In the words of business professor Gautam Mukunda: “Tesla’s current valuation only makes sense if you attribute magic powers to Elon Musk.” So another part of the explanation is that Musk was awarded the biggest pay package in history because shareholders believe him capable of performing corporate miracles.

There is a good chance that the bonus never materialises. But what if it does?

Tech elites like to ask each other about their “P(doom)” – the likelihood that AI will destroy the world in the foreseeable future. Some of this is sci-fi hokum, based on the idea that AI will soon develop human-like agency and begin making decisions in its own interest. But decisions like the one made by Tesla’s shareholders could actually raise the P(doom) value for the world.

Why? Because AI is what Musk likes to spend his money on. The entrepreneur is building AI-driven businesses, including Grok, that have reportedly reproduced contentious arguments around climate change, claims about “white genocide” in South Africa and praise for Hitler.

After these incidents, parent company xAI said it had taken steps to make Grok “politically neutral”, which could allow space for more minority views and so amplify climate scepticism, and blamed the South Africa posts on an “unauthorised modification” to the system prompt. In response to the Hitler posts, Musk wrote on X that Grok had been “manipulated” and that the issue was being addressed.

The problem isn’t a superintelligent AI diverting every resource on Earth into making paperclips as in a well-documented thought experiment. The problem is a run-of-the-mill chatbot spouting dangerous nonsense.

Tesla shares dipped after the compensation package was announced. Perhaps the shareholders are finally on to something?

The Conversation

The authors do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. Tesla’s US$1 trillion gamble on Elon Musk’s ‘visionary’ leadership – https://theconversation.com/teslas-us-1-trillion-gamble-on-elon-musks-visionary-leadership-269467

Psychedelics might help terminal patients find peace

Source: The Conversation – UK – By Muireann Quigley, Professor, Law, Medicine and Technology, University of Birmingham

LBeddoe/Shutterstock.com

In clinical trials around the world, a surprising treatment is showing promise for people with terminal illnesses: psychedelic therapy.

For many, the hardest part of dying isn’t physical pain but the fear, anxiety and sense of meaninglessness that often accompany it. While palliative care in the UK is rightly praised for easing pain and managing symptoms, patients’ emotional and spiritual suffering is often less well addressed.

Standard treatments – such as antidepressants, counselling and mindfulness – may ease some symptoms but often fail to help patients accept their diagnosis or find meaning in their remaining time. This is where psychedelic therapy may offer support.

The therapy involves the use of psychedelics such as psilocybin in combination with psychological support. This approach is designed to help patients explore difficult emotions, shift perspective and achieve profound psychological breakthroughs.

In two landmark studies, a high dose of psilocybin with psychotherapy was shown to reduce depression and anxiety in patients with life-threatening cancer. These effects were rapid and, in many cases, sustained for up to six months, with many participants reporting improved mood, emotional clarity and reduced fear of death.

Some also described experiences of deep emotional release, awe and a sense of connection during psychedelic therapy – altered states that appeared to help patients reframe their relationship to dying.

Psychedelic mushrooms growing in a substrate.
Psychedelic therapy helps patients explore difficult emotions.
Fotema/Shutterstock.com

Recognition of the potential of psychedelics for treating severe mental health conditions generally has led to significant regulatory shifts in several countries. For example, Australia, Germany and Canada are beginning to allow access to psychedelics for people with serious or treatment-resistant conditions.

Meanwhile, the EU has invested millions in research into psychedelic-assisted therapy. But in the UK, progress remains slow. Psychedelics are classed as substances of little or no medicinal value and are tightly controlled by the Misuse of Drugs Regulations. This makes research slow and access nearly impossible. Even clinical trials face costly licensing requirements and delays, discouraging researchers and limiting innovation.

A timely debate

Questions about how best to support people at the end of life are especially timely, as the end of life bill is currently being debated in parliament. While the bill focuses on legalising assisted dying, it has also sparked wider debate about the quality and scope of end-of-life care.

Access to good palliative support is not always guaranteed – a concern shared by both supporters and opponents of the bill. Against this backdrop, the limits of conventional approaches to psychological suffering become harder to ignore.

The bill opens up space to consider the potential role of psychedelic therapy, and to reflect more broadly on what it means to die well and whether current systems adequately support that goal.

The bill has prompted renewed public interest in how we treat psychological distress in the final stages of life. A recent YouGov poll found that most UK adults support relaxing restrictions on psilocybin research, especially for people with terminal illness. This suggests that public attitudes may be ahead of policy.

The bill provides an opportunity to question why the UK continues to implement such strict legal controls that hamper research and access to much-needed treatments, and why it lags behind other countries’ approaches. It invites a broader conversation about how the UK supports those facing the emotional and existential challenges of dying.

Clinical evidence, public attitudes and the changing international landscape all highlight growing interest in psychedelic therapy as a complement to conventional approaches like counselling. For those nearing the end of life, it may offer a rare chance to face death with less fear and more meaning and emotional clarity.

Psychedelic therapy won’t be right for everyone, but for some, it could mean meeting death with peace instead of despair.

The Conversation

Joanna Neill is affiliated with DrugScience, Onaya and Heroic Hearts Project UK.

Laura Downey and Muireann Quigley do not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and have disclosed no relevant affiliations beyond their academic appointment.

ref. Psychedelics might help terminal patients find peace – https://theconversation.com/psychedelics-might-help-terminal-patients-find-peace-265915

Forensic linguistics: how dark web criminals give themselves away with their language

Source: The Conversation – UK – By Emily Chiang, Research Associate, Aston Institute for Forensic Linguistics, Aston University

Shutterstock/nomad-photo.eu

Shannon McCoole ran one of the world’s largest dark web child abuse forums for around three years in the early 2010s. The forum provided a secure online space in which those interested in abusing children could exchange images, advice and support. It had around 45,000 users and was fortified with layers of online encryption that ensured near-complete anonymity for its users. In other words, it was a large and flourishing community for paedophiles.

McCoole eventually became the subject of an international investigation led by Taskforce Argos – a specialist unit in Australia’s Queensland Police Service dedicated to tackling online child abuse networks.

Key to the investigation – and McCoole’s eventual arrest and conviction – was a piece of linguistic evidence: his frequent use of an unusual greeting term, “hiyas”, as noticed by an investigating officer.

Investigators began searching relevant “clear web” sites (those openly accessible through mainstream search engines) for any markers of a similar linguistic style. They knew the kinds of websites to search because McCoole would speak about his outside interests on the forum, including basketball and vintage cars.

A man was discovered using the giveaway greeting on a four-wheel drive discussion forum. He lived in Adelaide and used a similar handle to the paedophile forum’s anonymous chief administrator. Another similarly named user – also using “hiyas” as a preferred greeting term – was discovered on a basketball forum. Suddenly, the police had their man.

This linguistic evidence contributed to the identification, arrest and eventual conviction of McCoole. But it didn’t end there. After McCoole’s arrest, Taskforce Argos took over his account and continued to run the forum, as him, for another six months. Police were able to gather vital intelligence that led to the prosecution of hundreds of offenders and to the rescue of at least 85 child victims.

McCool’s case is breathtaking, and it offers a compelling demonstration of the power of language in identifying anonymous individuals.

The power of language

My journey into forensic linguistics began in 2014 at Aston University, where I began learning about the various methods and approaches to analysing language across different contexts in the criminal justice system.

A forensic linguist might be called upon to identify the most likely author of an anonymously written threatening text message, based on its language features; or they might assist the courts in interpreting the meaning of a particular slang word or phrase.


The Insights section is committed to high-quality longform journalism. Our editors work with academics from many different backgrounds who are tackling a wide range of societal and scientific challenges.


Forensic linguists also analyse the language of police interviews, courtroom processes and complex legal documents, pointing out potential barriers to access to understanding, especially for the most vulnerable groups in society. Without thoughtful consideration of the linguistic processes that occur in legal settings and the communication needs of the population, these processes can (and do) result in serious miscarriages of justice.

A particularly egregious example of this occurred when Gene Gibson was wrongly imprisoned for five years in Australia after being advised to plead guilty to manslaughter. Gibson was an Aboriginal man with a cognitive impairment and for whom English was a third language. The conviction was overturned when the court of appeal heard Gibson had not understood the court process, nor the instructions he was given by his appointed interpreter.

So forensic linguistics is not just about catching criminals, it’s also about finding ways to better support vulnerable groups who find themselves, in whatever capacity, having to interact with legal systems. This is an attempt to improve the delivery of justice through language analysis.




Read more:
Forensic linguistics gives victims and the wrongfully convicted the voices they deserve


Something that struck me in the earliest days of my research was the relative lack of work exploring the language of online child sexual abuse and grooming. The topic had long received attention from criminologists and psychologists, but almost never linguists – despite online grooming and other forms of online child sexual offending being almost exclusively done through language.

There is no doubt that researching this dark side of humanity is difficult in all sorts of ways, and it can certainly take its toll.

Nonetheless, I found the decision to do so straightforward. If we don’t know much about how these offenders talk to victims, or indeed each other, then we are missing a vital perspective on how these criminals operate – along with potential new routes to catching them.

These questions became the central themes of both my MA and PhD theses, and led to my ongoing interest in the language that most people never see: real conversations between criminal groups on the dark web.

Anonymity and the dark web

The dark web originated in the mid-1990s as a covert communication tool for the US federal government. It is best described as a portion of the internet that is unindexed by mainstream search engines. It can only be accessed through specialist browsers, such as Tor, that disguise the user’s IP address.

This enables users to interact in these environments virtually anonymously, making them ideal for hidden conversations between people with shared deviant interests. These interests aren’t necessarily criminal or even morally objectionable – consider the act of whistleblowing, or of expressing political dissent in a country without free speech. The notion of deviance depends on local and cultural context.

Nonetheless, the dark web has become all but synonymous with the most egregious and morally abhorrent crimes, including child abuse, fraud, and the trafficking of drugs, weapons and people.

Combating dark web crime centres around the problem of anonymity. It is anonymity that makes these spaces difficult to police. But when all markers of identity – names, faces, voices – are stripped away, what remains is language.

And language expresses identity.

Through our conscious and unconscious selections of sounds, words, phrases, viewpoints and interactional styles, we tell people who we are – or at least, who we are being from moment to moment.

Language is also the primary means by which much (if not most) dark web crime is committed. It is through (written) linguistic interaction that criminal offences are planned, illicit advice exchanged, deals negotiated, goals accomplished.

For linguists, the records and messages documenting the exact processes by which crimes are planned and executed become data for analysis. Armed with theory and methods for understanding how people express (or betray) aspects of their identity online, linguists are uniquely placed to address questions of identity in these highly anonymous spaces.

What kind of person wrote this text?

The task of linguistic profiling is well demonstrated by the case of Matthew Falder. Falder pleaded guilty to 137 charges relating to child sexual exploitation, abuse and blackmail in 2018. The case was dubbed by the National Crime Agency (NCA) as its first ever “hurt-core” prosecution, due to Falder’s prolific use of “hidden dark web forums dedicated to the discussion and image and video sharing of rape, murder, sadism, torture, paedophilia, blackmail, humiliation and degradation”.

As part of the international investigation to identify this once-anonymous offender, police sought out the expertise of Tim Grant, former director of the Aston Institute for Forensic Linguistics, and Jack Grieve from the University of Birmingham. Both are world-leading experts in authorship analysis, the identification of unknown or disputed authors and speakers through their language. The pair were tasked with ascertaining any information they could about a suspect of high interest, based on a set of dark web communications and encrypted emails.

Where McCoole’s case was an example of authorship analysis (who wrote this text?), Falder’s demanded the slightly different task of authorship profiling (what kind of person wrote this text?).

When police need to identify an anonymous person of interest but have no real-world identity with which to connect them, the linguist’s job is to derive any possible identifying demographic information. This includes age, gender, geographical background, socioeconomic status and profession. But they can only glean this information about an author from whatever emails, texts or forum discussions might be available. This then helps them narrow the pool of potential suspects.

Grant and Grieve set to work reading through Falder’s dark web forum contributions and encrypted emails, looking for linguistic cues that might point to identifying information.

They were able to link the encrypted emails to the forum posts through some uncommon word strings that appeared in both datasets. Examples included phrases like “stack of ideas ready” and “there are always the odd exception”.

They then identified features that offered demographic clues to Falder’s identity. For example, the use of both “dish-soap” and “washing-up liquid” (synonymous terms from US and British English) within the same few lines of text. Grant and Grieve interpreted the use of these terms as either potential US influence on a British English-speaker, or as a deliberate attempt by the author to disguise his language background.

Ultimately, the linguists developed a profile that described a highly educated, native British English-speaking older man. This “substantially correct” linguistic profile formed part of a larger intelligence pack that eventually led to Falder’s identification, arrest and conviction. Grant’s and Grieve’s contribution earned them Director’s Commendations from the NCA.

Linguistic strategies

The cases of McCoole and Falder represent some of the most abhorrent crimes that can be imagined. But they also helped usher into public consciousness a broader understanding of the kinds of criminals that use the dark web. These online communities of offenders gather around certain types of illicit and criminal interests, trading goods and services, exchanging information, issuing advice and seeking support.

For example, it is not uncommon to find forums dedicated to the exchange of child abuse images, or advice on methods and approaches to carrying out various types of fraud.

In research, we often refer to such groups as communities of practice – that is, people brought together by a particular interest or endeavour. The concept can apply to a wide range of different communities, whether professional-, political- or hobby-based. What unites them is a shared interest or purpose.

But when communities of practice convene around criminal or harmful interests, providing spaces for people to share advice, collaborate and “upskill”, ultimately they enable people to become more dangerous and more prolific offenders.




Read more:
What is the dark web and how does it work?


The emerging branch of research in forensic linguistics of which I am part explores such criminal communities on the dark web, with the overarching aim of assisting the policing and disrupting of them.

Work on child abuse communities has shown the linguistic strategies by which new users attempt to join and ingratiate themselves. These include explicit references to their new status (“I am new to the forums”), commitments to offering abuse material (“I will post a lot more stuff”), and their awareness of the community’s rules and behavioural norms (“I know what’s expected of me”).

Research has also highlighted the social nature of some groups focused on the exchange of indecent images. In a study on the language of a dark website dedicated to the exchange of child abuse images, I found that a quarter of all conversational turns contributed to rapport-building between members – through, for example, friendly greetings (“hello friends”), well-wishing (“hope you’re all well”) and politeness (“sorry, haven’t got those pics”).

Hand typing on neon lit keyboard
Dark web criminals have to abide by strict social rules.
Shutterstock/Zuyeu Uladzimir

This demonstrates the perhaps surprising importance of social politeness and community bonding within groups whose central purpose is to trade in child abuse material.

Linguistic research on dark web criminal communities makes two things clear. First, despite the shared interest that brings them together, they do not necessarily attract the same kinds of people. More often than not they are diverse, comprising users with varied moral and ideological stances.

Some child abuse communities, for example, see sexual activity with children as a form of love, protesting against others who engage in violent abuse. Other groups openly (as far as is possible in dark web settings) seem to relish in the violent abuse itself.

Likewise, fraud communities tend to comprise people of highly varied motivations and morality. Some claim to be seeking a way out of desperate financial circumstances, while others proudly discuss their crimes as a way of seeking retribution over “a corporate elite”. Some are looking for a small side hustle that won’t attract “too many questions”, while a small proportion of self-identifying “real fraudsters” brag about their high status while denigrating those less experienced.

A common practice in these groups is to float ideas for new schemes – for example, the use of a fake COVID pass to falsely demonstrate vaccination status, or the use of counterfeit cash to pay sex workers. That the morality of such schemes provokes strong debate among users is evidence that fraud communities comprise different types of people, with a range of motivations and moral stances.

Community rules – even in abuse forums

Perhaps another surprising fact is that rules are king in these secret groups. As with many clear web forums, criminal dark web forums are typically governed by “community rules” which are upheld by site moderators. In the contexts of online fraud – and to an even greater extent, child abuse – these rules do not just govern behaviour and define the nature of these groups, they are essential to their survival.

Rules of child sexual exploitation and abuse forums are often extremely specific, laying out behaviour which are encouraged (often relating to friendliness and support among users) as well those which will see a user banished immediately and indefinitely. These reflect the nature of the community in question, and often differ between forums. For instance, some forums ban explicitly violent images, whereas others do not.

Rules around site and user security highlight users’ awareness of potential law enforcement infiltration of these forums. Rules banning the disclosure of personal information are ubiquitous and crucial to the survival and longevity of these groups.




Read more:
Our research on dark web forums reveals the growing threat of AI-generated child abuse images


Dark web sites often survive only days or weeks. The successful ones are those in which users understand the importance of the rules that govern them.

The rise of AI

Researching the language of dark web communities provides operationally useful intelligence for investigators. As in most areas of research, the newest issue we are facing in forensic linguistics is to try and understand the challenges and opportunities posed by increasingly sophisticated AI technologies.

At a time when criminal groups are already using AI tools for malicious purposes like generating abuse imagery to extort children, or creating deepfakes to impersonate public figures to scam victims, it is more important than ever that we understand how criminal groups communicate, build trust, and share knowledge and ideas.

By doing this, we can assist law enforcement with new investigative strategies for offender prioritisation and undercover policing that work to protect the most vulnerable victims.

As we stand at this technological crossroads, the collaboration between linguists, technology and security companies, and law enforcement has become more crucial than ever. The criminals are already adapting. Our methods for understanding and disrupting their communications must evolve just as quickly.


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The Conversation

Emily Chiang has received funding from UKRI – Innovate UK.

ref. Forensic linguistics: how dark web criminals give themselves away with their language – https://theconversation.com/forensic-linguistics-how-dark-web-criminals-give-themselves-away-with-their-language-267765

European nations have no choice but to raise retirement ages – our case study shows why

Source: The Conversation – Global Perspectives – By Javier Díaz Giménez, Profesor de Economía, IESE Business School (Universidad de Navarra)

Group of elderly Italians sitting on a bench in the centre of Scicli, Italy. Eddy Galeotti/Shutterstock

In early October 2025, with his political future hanging by a thread, France’s resigned-and-reappointed prime minister Sébastien Lecornu pledged to suspend unpopular pension reforms until 2027, when presidential elections will be held.

Socialist MPs declared victory. The French business community groaned. The S&P downgraded France’s credit rating, citing budget concerns.

With France kicking inevitable reforms at least two years down the road, and many European countries facing pension crises of their own, it is worth considering how to design pension reforms that are sustainable, equitable and politically viable.

One striking feature of the debate over pension reform in Europe is how well understood and extensively documented its root problems are. Europe’s population is aging. The birth rate is declining. Life expectancy is growing ever longer. Fewer people are contributing to fund public systems that will have more people drawing money from them for longer periods of time. At the same time, technological disruption is reducing the share of labour income in gross domestic product.

Since most of Europe’s pay-as-you-go systems were designed when demographics were entirely different, they must be adjusted to reflect the current reality. We accept this in other areas like education, where we rezone school districts and trim new school construction to reflect smaller numbers of children in our neighbourhoods. But any talk of adjusting the retirement age is met with thousands of furious protesters filling the streets of Paris, Madrid or Brussels.

In France, it’s also important to put the reform in perspective: it proposed raising the retirement age by two years, to 64. Denmark adjusts its retirement age every five years in line with life expectancy, and approved raising it to 70 by 2040 from its current 67 earlier in the year.

Pension reforms keep failing because the politics overrules the economics. Demographic transitions are predictable, their costs are measurable, and the policy tools needed to address their consequences already exist. But reforms collapse when they collide with electoral incentives and public mistrust.

How to move beyond these problems? Rather than looking at only one item, such as retirement age, we propose a multidimensional approach that addresses expenditures as well as contributions and compensates those who are initially impacted by the reforms. Spain served as our case study, but the lessons hold true for many European countries, France among them.




Leer más:
With delay of pension reform, Prime Minister Sébastien Lecornu puts France’s Socialist Party back in the spotlight


Automatic adjustments and one-off compensations

Part of the solution is incorporating new automatic adjustment mechanisms, or rules that adapt pensions according to changing economic and demographic realities. These mechanisms make pension systems more predictable and credible, and reduce their reliance on series of ad-hoc reforms that are fraught with political difficulties.

We also propose compensating the workers and retirees that bear the brunt of lowered pensions. This would be done through a one-off transfer of liquid assets from the government to households.

The downside of this policy is that governments would have to fund these payments, most likely by issuing new public debt. But as we have seen many times, reforms that are pushed through without any attempt to compensate those who lose out very often get reversed. Older voters with an eye on retirement – and there are increasing numbers of them every day – will block any attempt to cut their benefits unless they understand that they will be compensated for their losses.




Leer más:
Retirement as we know it is ending – it’s time to rethink the idea of working age


Making pension reform viable

For pension reforms to actually work, they should rest on five elements:

  1. Introduce a sustainability factor that adjusts the amount of initial pensions to the life expectancy of the cohort of the worker who is retiring. In practice, this means people who retire younger will receive a lower pension because they are likely to receive payments for more years. This creates an incentive for workers to extend their working lives.

  2. Introduce an automatic adjustment rule that updates pension rights and/or pensions to guarantee the financial sustainability of the system. Currently, many systems update pensions using the consumer price index. This is not sustainable, as it reduces the pension replacement rate, the ratio of pre-retirement salary to pension income. This is especially true in an environment of low or even zero labour productivity growth (as is the case in Spain).

  3. Calculate pensions using the contributions made during the entire working life of the workers who retire, rather than the last 25 years or some other reduced measure. Disregarding initial years worked tends to benefit top earners, and underfunds the system as a whole.

  4. Eliminate the caps on payroll tax contributions but maintain maximum pensions, so that higher earners pay more into the system without receiving higher pensions in return.

  5. Offer a one-time compensation for the workers and retirees that lose with these reforms. These compensations can be financed with public debt. This transitional component facilitates a fair transition and prevents the social rejection that often causes pension reforms to fail.

When combined, these measures not only improve the financial sustainability of the pension systems reducing future pension expenditures, but they also encourage private savings and promote longer working lives. If the reforms are announced well in advance, the cost of the transition may be lower, as households have more leeway to adjust their consumption, savings and retirement choices.

This doesn’t mean pension reforms will not create controversy. If these measures were adopted, governments would need to explain them clearly and anticipate public pushback. They would also need to make clear that without reforms, substantial tax increases will be inevitable.

The alternative, however, is worse. According to our calculations, Spain would have to raise its average value-added tax by 9 percentage points, from 16% to 25%, in order to raise enough revenues to sustain the current system indefinitely. By delaying unpopular decisions on pensions, politicians are setting themselves up for even more unpopular tax hikes in the future.


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The Conversation

Javier Díaz Giménez is the holder of the Cobas Asset Management Chair on Savings and Pensions at IESE Business School.

Julián Díaz Saavedra has received financial support from the Cobas Asset Management Chair on Savings and Pensions at IESE Business School.

ref. European nations have no choice but to raise retirement ages – our case study shows why – https://theconversation.com/european-nations-have-no-choice-but-to-raise-retirement-ages-our-case-study-shows-why-268412

Why two tiny mountain peaks became one of the internet’s most famous images

Source: The Conversation – USA (2) – By Christopher Schaberg, Director of Public Scholarship, Washington University in St. Louis

The icon has various iterations, but all convey the same meaning: an image should be here. Christopher Schaberg, CC BY-SA

It’s happened to you countless times: You’re waiting for a website to load, only to see a box with a little mountain range where an image should be. It’s the placeholder icon for a “missing image.”

But have you ever wondered why this scene came to be universally adopted?

As a scholar of environmental humanities, I pay attention to how symbols of wilderness appear in everyday life.

The little mountain icon – sometimes with a sun or cloud in the background, other times crossed out or broken – has become the standard symbol, across digital platforms, to signal something missing or something to come. It appears in all sorts of contexts, and the more you look for this icon, the more you’ll see it.

You click on it in Microsoft Word or PowerPoint when you want to add a picture. You can purchase an ironic poster of the icon to put on your wall. The other morning, I even noticed a version of it in my Subaru’s infotainment display as a stand-in for a radio station logo.

So why this particular image of the mountain peaks? And where did it come from?

Arriving at the same solution

The placeholder icon can be thought of as a form of semiotic convergence, or when a symbol ends up meaning the same thing in a variety of contexts. For example, the magnifying glass is widely understood as “search,” while the image of a leaf means “eco-friendly.”

It’s also related to something called “convergent design evolution,” or when organisms or cultures – even if they have little or no contact – settle on a similar shape or solution for something.

In evolutionary biology, you can see convergent design evolution in bats, birds and insects, who all utilize wings but developed them in their own ways. Stilt houses emerged in various cultures across the globe as a way to build durable homes along shorelines and riverbanks. More recently, engineers in different parts of the world designed similar airplane fuselages independent of one another.

For whatever reason, the little mountain just worked across platforms to evoke open-ended meanings: Early web developers needed a simple shorthand way to present that something else should or could be there.

Depending on context, a little mountain might invite a user to insert a picture in a document; it might mean that an image is trying to load, or is being uploaded; or it could mean an image is missing or broken.

Down the rabbit hole on a mountain

But of the millions of possibilities, why a mountain?

In 1994, visual designer Marsh Chamberlain created a graphic featuring three colorful shapes as a stand-in for a missing image or broken link for the web browser Netscape Navigator. The shapes appeared on a piece of paper with a ripped corner. Though the paper with the rip will sometimes now appear with the mountain, it isn’t clear when the square, circle and triangle became a mountain.

A generic camera dial featuring various modes, with the 'landscape mode' – represented by two little mountain peaks – highlighted.
Two little mountain peaks are used to signal ‘landscape mode’ on many SLR cameras.
Althepal/Wikimedia Commons, CC BY

Users on Stack Exchange, a forum for developers, suggest that the mountain peak icon may trace back to the “landscape mode” icon on the dials of Japanese SLR cameras. It’s the feature that sets the aperture to maximize the depth of field so that both the foreground and background are in focus.

The landscape scene mode – visible on many digital cameras in the 1990s – was generically represented by two mountain peaks, with the idea that the camera user would intuitively know to use this setting outdoors.

Another insight emerged from the Stack Exchange discussion: The icon bears a resemblance to the Microsoft XP wallpaper called “Bliss.” If you had a PC in the years after 2001, you probably recall the rolling green hills with blue sky and wispy clouds.

The stock photo was taken by National Geographic photographer Charles O’Rear. It was then purchased by Bill Gates’ digital licensing company Corbis in 1998. The empty hillside in this picture became iconic through its adoption by Windows XP as its default desktop wallpaper image.

A colorful stock photo of green rolling hills, a blue sky and clouds.
If you used a PC at the turn of the 21st century, you probably encountered ‘Bliss.’
Wikimedia Commons

Mountain riddles

“Bliss” became widely understood as the most generic of generic stock photos, in the same way the placeholder icon became universally understood to mean “missing image.” And I don’t think it’s a coincidence that they both feature mountains or hills and a sky.

Mountains and skies are mysterious and full of possibilities, even if they remain beyond grasp.

Consider Japanese artist Hokusai’s “36 Views of Mount Fuji,” which were his series of paintings from the 1830s – the most famous of which is probably “The Great Wave off Kanagawa,” where a tiny Mount Fuji can be seen in the background. Each painting features the iconic mountain from different perspectives and is full of little details; all possess an ambiance of mystery.

A painting of a large rowboat manned by people on rolling waves with a large mountain in the background.
‘Tago Bay near Ejiri on the Tokaido,’ from Hokusai’s series ‘36 Views of Mount Fuji.’
Heritage Art/Heritage Images via Getty Images

I wouldn’t be surprised if the landscape icon on those Japanese camera dials emerged as a minimalist reference to Mount Fuji, Japan’s highest mountain. From some perspectives, Mount Fuji rises behind a smaller incline. And the Japanese photography company Fujifilm even borrowed the namesake of that mountain for their brand.

The enticing aesthetics of mountains also reminded me of the environmental writer Gary Snyder’s 1965 translation of Han Shan’s “Cold Mountain Poems.” Han Shan – his name literally means “Cold Mountain” – was a Chinese Buddhist poet who lived in the late eighth century. “Shan” translates as “mountain” and is represented by the Chinese character 山, which also resembles a mountain.

Han Shan’s poems, which are little riddles themselves, revel in the bewildering aspects of mountains:

Cold Mountain is a house
Without beams or walls.
The six doors left and right are open
The hall is a blue sky.
The rooms are all vacant and vague.
The east wall beats on the west wall
At the center nothing.

The mystery is the point

I think mountains serve as a universal representation of something unseen and longed for – whether it’s in a poem or on a sluggish internet browser – because people can see a mountain and wonder what might be there.

The placeholder icon does what mountains have done for millennia, serving as what the environmental philosopher Margret Grebowicz describes as an object of desire. To Grebowicz, mountains exist as places to behold, explore and sometimes conquer.

The placeholder icon’s inherent ambiguity is baked into its form: Mountains are often regarded as distant, foreboding places. At the same time, the little peaks appear in all sorts of mundane computing circumstances. The icon could even be a curious sign of how humans can’t help but be “nature-positive,” even when on computers or phones.

This small icon holds so much, and yet it can also paradoxically mean that there is nothing to see at all.

Viewing it this way, an example of semiotic convergence becomes a tiny allegory for digital life writ large: a wilderness of possibilities, with so much just out of reach.

The Conversation

Christopher Schaberg does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond their academic appointment.

ref. Why two tiny mountain peaks became one of the internet’s most famous images – https://theconversation.com/why-two-tiny-mountain-peaks-became-one-of-the-internets-most-famous-images-268169

La musculation améliore-t-elle la densité osseuse ?

Source: The Conversation – in French – By Hunter Bennett, Lecturer in Exercise Science, University of South Australia

La musculation est excellente pour la santé osseuse. (Unsplash), CC BY-NC-ND

Vous avez peut-être entendu dire que les activités à impact élevé, telles que la course à pied, le saut, le football et le basket-ball, sont bonnes pour renforcer la densité et la solidité osseuses. Mais qu’en est-il lorsque vous êtes immobile, en train de soulever des poids dans une salle de sport ?

La bonne nouvelle, c’est que la musculation est excellente pour la santé osseuse. Mais certains exercices sont plus efficaces que d’autres. Voici ce qu’en dit la science.

Qu’est-ce que la densité osseuse ?

La densité osseuse, également appelée densité minérale osseuse, est essentiellement une mesure de la quantité de minéraux (tels que le calcium et le phosphore) contenus dans vos os. Elle vous donne une indication de la solidité de vos os, ce qui est important, car les os plus denses sont généralement moins susceptibles de se fracturer.

Cependant, la densité osseuse n’est pas tout à fait la même chose que la résistance osseuse.

Les os dépendent également d’une série d’autres composés (tels que le collagène) pour assurer leur soutien et leur structure. Ainsi, même des os denses peuvent devenir fragiles s’ils manquent de ces composants structurels essentiels.

Cependant, la densité minérale osseuse est toujours considérée comme l’un des meilleurs indicateurs de la santé osseuse, car elle est étroitement liée au risque de fracture.

Bien qu’il existe probablement une composante génétique dans la santé osseuse, vos choix quotidiens peuvent avoir un impact important.

Qu’est-ce qui affecte votre santé osseuse ?

Des recherches montrent que plusieurs facteurs peuvent influencer la solidité et la densité de vos os :

Le vieillissement : Avec l’âge, notre densité minérale osseuse a tendance à diminuer. Ce déclin est généralement plus important chez les femmes après la ménopause, mais il touche tout le monde.

Nutrition : Consommer des aliments riches en calcium – en particulier les produits laitiers, mais également de nombreux légumes, noix, légumineuses, œufs et viande – a un impact limité sur la densité osseuse (bien que l’ampleur de la réduction du risque de fracture ne soit pas claire).

Exposition au soleil : la lumière du soleil aide votre corps à produire de la vitamine D, qui facilite l’absorption du calcium, et a été associée à une meilleure densité osseuse.

Exercice physique : il est bien établi que les personnes qui pratiquent des exercices à impact élevé et à forte charge (tels que le sprint et la musculation) ont tendance à avoir des os plus denses et plus solides que celles qui n’en font pas.

Tabagisme : Les personnes âgées qui fument ont généralement une densité osseuse plus faible que celles qui ne fument pas.

Pourquoi l’activité physique améliore-t-elle la densité osseuse ?

Tout comme vos muscles se renforcent lorsque vous les soumettez à un effort, vos os se renforcent lorsqu’ils sont soumis à une charge plus importante. C’est pourquoi l’exercice physique est si important pour la santé osseuse, car il incite vos os à s’adapter et à se renforcer.

Nous sommes nombreux à savoir que les personnes à risque de perte osseuse, à savoir les femmes ménopausées et les personnes âgées, doivent privilégier l’exercice physique pour préserver leur santé osseuse. Cependant, tout le monde peut tirer profit d’un exercice physique ciblé, et il est sans doute tout aussi important de prévenir le déclin de la santé osseuse.

En fait, que vous soyez un homme ou une femme, plus vous commencez jeune, plus vous avez de chances d’avoir des os plus denses à un âge avancé. C’est essentiel pour la santé osseuse à long terme.

La musculation améliore-t-elle la densité osseuse ?

Oui. L’un des exercices les plus efficaces pour la santé osseuse est la musculation.

Lorsque vous soulevez des poids, vos muscles tirent sur vos os, envoyant des signaux qui encouragent la formation de nouveaux os. Il existe de nombreuses preuves montrant que la musculation peut améliorer la densité osseuse chez les adultes, y compris chez les femmes ménopausées.

Mais tous les exercices ne se valent pas. Par exemple, certaines preuves suggèrent que les exercices composés qui sollicitent davantage le squelette, tels que les squats et les soulevés de terre, sont particulièrement efficaces pour augmenter la densité de la colonne vertébrale et des hanches, deux zones sujettes aux fractures.


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Quel type de musculation est le plus efficace ?

On pense que soulever des poids plus lourds donne de meilleurs résultats que soulever des poids plus légers. Cela signifie que faire des séries de trois à huit répétitions avec des poids lourds aura probablement un plus grand impact sur vos os que faire de nombreuses répétitions avec des poids plus légers.

De même, vos os ont besoin de beaucoup de temps pour s’adapter et devenir plus denses, généralement six mois ou plus. Cela signifie que pour avoir des os en bonne santé, il vaut mieux intégrer la musculation à votre routine hebdomadaire plutôt que de la pratiquer de manière intensive pendant quelques semaines.

Les exercices qui utilisent le poids du corps, tel que le yoga et le pilates, présentent de nombreux avantages pour la santé. Cependant, ils sont peu susceptibles d’avoir un impact significatif sur la densité osseuse, car ils ne sollicitent généralement que très peu vos os.

Si vous débutez dans la musculation, vous devrez peut-être commencer par des poids plus légers et vous habituer aux mouvements avant d’augmenter la charge. Et si vous avez besoin d’aide, trouver un professionnel de l’exercice physique dans votre région pourrait être une excellente première étape.

Faire de l’exercice pour la santé osseuse n’est pas compliqué. Quelques séances de musculation (intense) par semaine peuvent faire une grande différence. Si vous craignez d’avoir une faible densité osseuse, parlez-en à votre médecin. Il pourra évaluer si vous devez passer un scanne.

La Conversation Canada

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ref. La musculation améliore-t-elle la densité osseuse ? – https://theconversation.com/la-musculation-ameliore-t-elle-la-densite-osseuse-263991