English – Page 322 – MIL Submissions Engine

July 27, 2025

Women’s rugby is booming, but safety relies on borrowed assumptions from the men’s game

Source: The Conversation – Canada – By Kathryn Dane, Postdoctoral associate, University of Calgary

Rugby union, commonly known as just rugby, is a fast-paced and physical team sport. More girls and women in Canada and around the world are playing it now than ever before.

As of 2021, women’s rugby reached a record 2.7 million players globally, a 25 per cent increase over four years, and by 2023, women’s rugby participation was growing at a rate of 38 per cent year-over-year.

Countries including Australia, England, Ireland and the United States offer professional contracts for women’s teams. While these remain modest compared to the men’s game, they still represent a clear step forward.

Canada’s senior women’s XVs team is currently ranked second in the world and heading into the 2025 Rugby World Cup, which kicks off on Aug. 22 in England. The national sevens team also captured silver at the 2024 Paris Olympics — further evidence of the game’s growing competitiveness in Canada.

However, many systems, including coaching and medical support, have not kept pace with the demands of elite competition. With visibility increasing ahead of the 2025 World Cup, stronger institutional support is needed to match the sports’ growing professionalism and popularity.

Safety concerns

Often described as a “game for all”, rugby builds confidence, resilience and lifelong friendships. For girls and women especially, rugby can be empowering in ways few sports can match. It embraces the physicality of tackling, pushes back against traditional gender expectations and fosters solidarity and inclusion by valuing all body shapes and abilities.

But rugby is also a collision sport, and as such, it carries inherent risks. Tackling is the top cause of injury in rugby, and it has one of the highest concussion rates among youth girls’ sports in Canada. Concussions can have long-term effects on players’ health.

These concerns are especially urgent as the women’s game becomes more physical and professionalized, and players are hit harder and more often. Unlike men’s rugby, women’s teams often operate with fewer medical or coaching support resources, which can lead to inconsistent or absent injury prevention programs.

Compounding the risk is the fact that many women also come to rugby later in life, often with less experience in contact sports. This delayed exposure restricts proper tackle skill development and player confidence in contact. This means safe tackling is even more important.

Without proper supports, the physical risks of the game may outweigh its benefits.

Science is still playing catch-up

While women’s rugby is growing rapidly, the science behind it is has not kept pace. Most of what we know about rugby safety — how to tackle, how much to train or when it’s safe to return to play after injury — largely comes from research on men.

Decisions around coaching and player welfare have been based on male data, leaving female players under-served and potentially at greater risk. While these foundations may well apply to girls and women, the problem is we don’t yet know for sure.

Only four per cent of rugby tackle research has focused on women. Much of the early evidence on girls rugby comes from Canada, underscoring the country’s leadership in this space. Still, most coaches and clinicians rely on a “one-size-fits-all” approach that may not account for menstrual cycles, pregnancy, different injury profiles or later sport entry.

The differences matter because strength, speed and injury risk all vary. Women are 2.6 times more likely than men to sustain a concussion. Gender also shapes access to training, care and facilities, often limiting opportunities for women to develop safe tackling skills, receive adequate support and train in safe, well-resourced environments, factors that impact both performance and safety.

Even safety tools reflect this gap. World Rugby’s Tackle Ready and contact load guidelines were designed around male athletes. While well-intentioned, we know little about how they work for girls and women. Instead of discarding these tools, we need to adapt and evaluate them in female contexts to ensure they support injury prevention and provide equal protection.

Women’s rugby needs better data

Change is underway. More research and tools are being designed specifically for girls and women. A search of PubMed, a database of published biomedical research, reveals a steep rise in studies on women’s rugby over the past decade, especially in injury surveillance, injury prevention, performance, physiology and sociocultural contexts.

New rule trials, such as testing lower tackle heights, are being evaluated on women athletes. New technologies like instrumented mouthguards and video analysis are also helping researchers understand how girls and women tackle, how head impacts happen and how they can be prevented.

Much of this new research is led by our team at the Sport Injury Prevention Research Centre, a pan-Canadian, multidisciplinary group focused on moving upstream to prevent concussions in adolescent girls’ rugby.

The women’s game is also driving its own innovations. Resources like World Rugby’s Contact Confident help girls and women safely build tackle skills, particularly those new to contact sport.

Researchers are analyzing injury patterns, interviewing players and coaches and studying return-to-play pathways that reflect girls’ and women’s physiology and life stages.

The scope of research is also expanding to pelvic health, breast protection and more tailored injury prevention. Global collaboration is making this work more inclusive, spanning different countries, skill levels and age groups, not just elite competitions.

But this is just the start.

A golden opportunity lies ahead

Girls’ and women’s rugby is experiencing unprecedented growth. Rising participation, media attention and new sponsorships are fuelling momentum. It’s a golden opportunity to build strong, sustainable foundations.

Gold-standard support requires focused, ongoing research and a commitment to sharing that evidence with players, coaches, health-care providers and policymakers. It’s time to build systems for women’s rugby based on women’s data, not borrowed assumptions from the men’s game.

But challenges remain. Some national teams still have to raise funds to attend World Cups. Others train without consistent access to medical or performance staff — clear signs that the women’s game is still catching up.

To sustain and accelerate the growth of girls’ and women’s rugby, the sport deserves more resources and research tailored specifically to participants. A “one-size-fits-all” model no longer works. By investing in systems that are safer, focused on prevention, more inclusive and grounded in evidence, we can build a thriving future for women’s rugby that lasts for generations to come.

Isla Shill has received funding from World Rugby.

Stephen West has previously received funding from World Rugby

Kathryn Dane 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. Women’s rugby is booming, but safety relies on borrowed assumptions from the men’s game – https://theconversation.com/womens-rugby-is-booming-but-safety-relies-on-borrowed-assumptions-from-the-mens-game-261055

July 27, 2025

Iranian Canadians watch the Israel-U.S. war in Iran from afar

Source: The Conversation – Canada – By Fateme Ejaredar, PhD candidate in Sociology, University of Calgary, University of Calgary

Iranian Canadians have been following the news in Iran carefully. Sadaf Vakilzadeh/Unsplash, CC BY

The recent war waged by Israel and the United States on Iran killed at least 935 people and wounded another 5,332. There’s currently a ceasefire, but the conflict shocked the world and has had unique impacts on Iranians in the diaspora.

Many Iranians in Canada were glued to their media feeds to stay close to Iran and their friends and families.

Based on preliminary interviews with 30 Iranian activists in Canada, many in the diaspora have experienced what they call “survivor’s guilt.”

The interviews are part of a PhD study conducted online or in person by one of the authors of this story, Fateme Ejaredar, and supervised by co-author Pallavi Banerjee. The information from these interviews helps to untangle the roots of political tensions and evolving solidarities in the Iranian diaspora in Canada. For this research, 30 interviews were conducted, with seven followups after the conflict began on June 13, 2025.

A large share of the Iranian diaspora in Canada is comprised of activists who disavow the Islamic Republic. According to The New York Times, the Iranian diaspora includes “exiled leftists, nationalists, secular democrats, former prisoners, journalists, human rights advocates and artists.” This population of diasporic Iranians has been supporting progressive change in Iran.

There are also those who oppose the Islamic Republic in support of the deposed shah, a movement currently swayed by Reza Pahlavi, the son of Iran’s last shah. They see the U.S. and Israel as liberators of the Iranian people. The current war resurfaced many of these tensions that continue to divide the diaspora.

The war has left Iranian activists in the diaspora contending with contradictions about both their standing as activists while mourning the assaults on their country, both from within and outside.

Living in between homeland and hostland

Canada has the second largest Iranian diaspora in the world. Iran’s tumultuous political climate has kept the diaspora on edge and divided since the 1979 revolution that deposed the shahs.

After the revolution, many left-wing and other opposition activists who resisted both the pre- and post-revolutionary regimes went into exile. Continued political repression and economic hardship later forced even more Iranians, including activists, to leave the country. Strife peaked again in 2022 during the “Woman, Life, Freedom” protests which deeply impacted the diaspora.

Matin, a participant in her 30s from Alberta (all names of interviewees are pseudonyms), said:

“I’m sad that my home is being bombed. And you don’t have the energy to argue in this situation. For a soul that’s already tired, its wounds from 2022 aren’t healed yet, it can’t go into this again. It’s a dead end.”

Sociological research on migration and transnationalism has explained how those exiled from their homelands and living in diaspora reside in the “in-between lands.”

This is heightened when the homeland is in a state of political disarray, producing what sociologists have called “exogenous shocks” for the diaspora.

This is the unsettled feeling Iranians in the diaspora have been contending with for the last 45 years. They are constantly navigating life in between the homeland and hostland.

Fragmented nationalism

People’s fragmented sense of nationalism can shape responses to upheavals in the homeland.

Many we spoke with struggle with their own interpretations of Iranian nationalism that clash with their disdain for the Islamic Republic. Their disdain is rooted in their own lived experiences under the regime — ranging from the loss of basic rights and freedoms, to harsh repression including imprisonment and torture for some, or simply an unfulfilled desire of living in a peaceful and free society.

Vida, an interviewee in her 30s who lives in Saskatchewan, said even though she despised the politics of the Islamic Republic and in the past had celebrated the death of key officials like Qasem Soleimani, the recent war has invoked some conflicting feelings about the death of military leaders.

She took pride in solidarities forged among the diaspora due to the war and interpreted it as nationalism. Vida said:

“I never was a nationalist, and I hate nationalism. But there were moments these days that I felt proud. Seeing all the solidarity between people, seeing how they helped each other…”

Even as the activists feel protective of their country because of the war, they also experience a deep sense of loss and guilt they have always felt in exile.

Tensions in the diaspora

Iran’s relationship with the West has continued to be fraught.

The West, particularly the U.S., has leveraged Iran’s repression of women to economically disable Iran through sanctions, breaking down possibilities of diplomacy between Iran and the U.S. But feminist scholars have argued this stance has only further empowered the authoritarian and patriarchal political forces in Iran..

Iranian activists in the diaspora contend with both resisting the Islamic Republic’s role in oppression of Iranians in Iran and the American role in marginalizing Iranians in Iran.

The ‘Iran of our dreams’

The in-between spaces are precarious and unpredictable. But they also bring new possibilities and in this case, as many interviewees have indicated, acts of resistance from afar.

This can be further activated in moments of upheaval. And those living in the in-between spaces can often form new alliances and solidarities.

For many activist Iranians, the resistance in Palestine has been a source of inspiration since before the revolution of 1979. Many participants in this study mentioned in their interviews how they have long felt solidarity with Palestinians, but they say since June 13, they have an even deeper understanding of their situation.

Zara, in her 40s from Ontario, said she now understands more deeply how the world could be indifferent towards those critiquing the actions of Israel, saying she feels:

“… a sense of helplessness and desperation against all that illogical violent power.”

Despite the desolation expressed by our interviewees about the war, many activists also expressed faith in resistance for freedom and justice that allows them to envision a different future.

Jamshid, in his 60s in British Columbia, shared his future vision of Iran. It is:

“ … an Iran that lives in peace. There is social justice in it and no one is injured. It takes care of itself. It’s very kind, immensely kind… Maybe one day it will happen and we’re not here to see it.”

Pallavi Banerjee receives funding from the Social Sciences and Humanities Research Council and Immigration, Refugees and Citizenship Canada.

Fateme Ejaredar 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. Iranian Canadians watch the Israel-U.S. war in Iran from afar – https://theconversation.com/iranian-canadians-watch-the-israel-u-s-war-in-iran-from-afar-259866

July 27, 2025

How do politicians view democracy? It depends on whether they win or lose

Source: The Conversation – Canada – By Valere Gaspard, Research Fellow, Leadership and Democracy Lab, Western University

There is a heightened concern about the current state of democracy around the globe. These include worries about a decrease in freedom, the growing number of autocracies around the world and citizens’ dissatisfaction with democracy or government.

A 2022 survey of Canadians found that one-third have little to no trust in democracy and close to half don’t feel represented by government. These concerns aren’t unique to Canada.

A lot of public opinion research on views about democracy focuses on citizens. Surely this is understandable, since they are the ones choosing who is in power in a democratic state.

But what do the people in power or those running for office think about democracy? Surprisingly, for all the attention we place on politicians, we don’t know much about how they regard the democratic systems they operate in.

Why it matters

Why should we care about what politicians think about democracy? Because politicians can influence the views of citizens, and if they’re elected, they can affect or change democratic processes from within major institutions like legislatures.

Therefore, to understand the contemporary health of democracies across the globe, we need to factor in politicians’ satisfaction with the way democracy works.

While there are growing concerns about the current state of democracy around the globe, new open-access research I’ve conducted has hopeful findings, at least from the perspective of politicians. The analysis covers 49 elections in 21 countries — including Canada — from 2005 to 2021.

The results show that politicians’ democratic satisfaction in a country will be higher when:

Elections in their country have high electoral integrity; in other words, when elections are free and fair
Electoral management bodies have sufficient resources to administer elections.

This is good news from the perspective of maintaining a healthy democracy, since the people seeking the power of elected office are more satisfied when their democratic system is working well.

But these findings become convoluted once we consider some attributes of politicians. Specifically, politicians’ democratic satisfaction begins to vary once we consider:

Whether their political party formed the government (winner) or is not part of government (loser)
Whether they identify with the ideological left or right.

Winning and losing

Nobody likes to lose, so it’s natural that a winner will be more satisfied with democracy.

Although, the view that may be surprising — or troubling — is the extent to which politicians who won tolerate low electoral integrity, at least in terms of their democratic satisfaction.

As illustrated above, when electoral integrity is low in a country, politicians who lose will be much less satisfied with democracy than winners. When electoral integrity is high, there is no noticeable difference between politicians that won or lost.

The difference between winners’ and losers’ democratic satisfaction is problematic, but what is most troubling is that winners’ satisfaction with democracy does not significantly change across different levels of electoral integrity.

When it comes to citizens, previous research has shown that when electoral integrity is low, democratic satisfaction among citizens will also be low, regardless of whether their preferred politician or political party won or lost.

Politicians therefore differ from their citizen counterpart — those who won are much more tolerant of lower electoral integrity (at least in terms of their democratic satisfaction).

In a stable democracy with free and fair elections, this might not matter much. However, if a country begins to experience democratic decline, then these attitudes could become detrimental.

If politicians who win are not concerned with low electoral integrity, then they might lack the incentive needed to make necessary changes to electoral processes. Those concerned about electoral processes in these kinds of circumstances may therefore need to find alternative routes or incentives to encourage change.

Left-to-right political ideology

While the contrast between winners and losers may be discouraging, there are more similarities between those on the ideological left and right. Electoral management bodies having sufficient resources to administer elections matters to both leftist and rightist politicians in terms of their democratic satisfaction.

However, as shown above, having sufficient resources to administer elections matters more to politicians on the ideological right. This may surprise some readers given past claims that right-leaning groups or people might advocate for more restrictive voting processes and laws.

For those concerned with democratic stability, it’s promising to note that politicians across the ideological spectrum will generally be more satisfied with democracy when there are more resources to administer elections.

Overall, politicians on average tend to be more satisfied with democracy when it is working well — specifically, when elections are free and fair, and when electoral management bodies have the capacity to administer well-run elections. This is good news given concerns surrounding the current global state of democracy.

However, policymakers and practitioners in Canada and abroad focusing on democratic stability and elections should take note of these findings. The attitudes of politicians in democratic countries may not be concerning when everything is working as intended, but if democratic processes begin to weaken or fail, the indifference of winners towards electoral integrity could be troublesome.

At this moment of heightened concern about the current state of democracy around the globe, researchers and practitioners alike need to better understand the attitudes and motivations of the people who lead our systems of government.

Valere Gaspard is a PhD candidate at the University of Ottawa and a Research Fellow at Western University and Trent University’s Leadership and Democracy Lab. His research is supported in part by funding from the Social Sciences and Humanities Research Council (CGS Doctoral award). His views do not reflect those of any employer(s).

– ref. How do politicians view democracy? It depends on whether they win or lose – https://theconversation.com/how-do-politicians-view-democracy-it-depends-on-whether-they-win-or-lose-261647

July 27, 2025

3D printed food: yuck or yes? Researchers ask South African consumers

Source: The Conversation – Africa (2) – By Oluwafemi Adebo, Professor of Food Technology and Director of the Centre for Innovative Food Research (CIFR), University of Johannesburg

Would you eat food that was printed by a machine? 3D printed food is built up by equipment (a 3D food printer), layer after layer, using edible pastes, dough and food slurries in three-dimensional forms. These machines use digital models to produce precise, often personalised food items. Most 3D printed foods are made from nutrient-dense sources (plant and animal), which means they can offer health benefits.

The global market for 3D printed food is growing. It’s been estimated as worth US$437 million in 2024 and projected to reach US$7.1 billion in 2034. But the concept is still emerging in Africa.

Food science and technology researcher Oluwafemi Ayodeji Adebo and marketing academic Nicole Cunningham share what they learnt from a survey about South African consumers’ feelings on the subject.

How is food 3D printed and why?

In 3D food printing, edible food materials are formulated into printable materials (food ink). These inks can be made from pureed vegetables, doughs, or nutrient-rich mixes. The food ink is loaded into a 3D printer and extruded in layers until the selected shape is complete.

After printing, some products are ready to eat, while others need further processing such as baking or freeze-drying. The most common method is extrusion-based printing, valued for its simplicity and versatility.

The technique enables the customisation of food. Meals can be highly personalised in texture, appearance and nutritional content.

It can also transform food waste into food products. For example it can turn imperfect broccoli and carrots into healthy snacks and make noodles from potato peels.

It’s also useful in texture-modified diets for people with swallowing difficulties (dysphagia), especially the elderly. The products available for these patients tend to be bland and unappealing meals such as mashed potato, pumpkin and soft porridge. 3D food printing can produce nutritionally dense meals that are easier to eat and more appetising.

Food ink can combine various sources with different nutrients to boost the health benefits. Not having to process the product with heat can also result in higher nutritional content.

In South Africa, what sorts of foods might be 3D printed?

Virtually any edible material could be transformed into food inks, although some might require additives to make them printable. The abundance of nutrient-dense and health-promoting food crops in South Africa presents an excellent opportunity for 3D food printing to create novel food.

Sorghum, cowpea and quinoa have been used to make 3D printed biscuits, for example. They are more nutritious than wheat and don’t contain gluten.

Research at the Centre for Innovative Food Research at the University of Johannesburg has already demonstrated the feasibility of obtaining 3D printed products from different sources (for example whole-grain sourdough and malt biscuits, biscuits from wholegrain and multigrain flours and nutritious and appetising meals for dysphagia patients).

3D food printing is still in its infancy in South Africa, compared to developed countries such as China, Japan, the US and some European countries. The best-known companies that have adopted this technology include BluRhapsody, based in Italy, which makes 3D-printed pasta, and Open Meals based in Japan, which specialises in personalised sushi.

We carried out a study to understand South African consumers’ attitudes toward 3D-printed foods. Although the technology is not yet in wide use, we found some consumers were fairly knowledgeable about these foods and the associated benefits. These findings lay the foundation for business opportunities to commercialise and market 3D printed products in the region.

Who did you ask about it in your study?

The study surveyed South African consumers aged 18-65 who were familiar with the concept of 3D-printed food. We collected 355 responses, mostly females aged 24 to 44. They provided information and opinions on several aspects, including:

their awareness of 3D-printed food
their familiarity with 3D-printed food
their food neophobia (fear of new foods)
the convenience that 3D-printed food offers
their perspective on their health needs
the perceived benefits that 3D-printed food offers
attitudes towards 3D-printed food.

What did they say?

Positive attitudes were strongest among those who recognised the convenience and health-related benefits of this new technology. The potential to reduce waste, customise nutrition, and simplify meal preparation stood out as key motivators.

Interestingly, food familiarity didn’t play a significant role in people’s responses. This means they aren’t necessarily clinging to traditional or childhood meals when forming attitudes about 3D-printed food.

In short, novelty alone isn’t a deal-breaker, it’s more about perceived safety, usefulness, and understanding the benefits.

What does this tell us?

The findings highlight the crucial role of consumer education and awareness in shaping attitudes toward 3D-printed food. While unfamiliarity with the technology can create some hesitation, the research shows that consumers are not necessarily resistant to innovation. They just need to understand it better and be educated about the benefits it offers.

If food manufacturers and marketers invest in increasing public knowledge and offering hands-on experiences such as tastings, demonstrations, or transparent production processes, then consumer attitudes could shift positively.

This approach has shown promise in other markets. For example, educational campaigns in Europe and the US around lab-grown meat and plant-based proteins have improved public perception over time.

Marketers should talk about safety, health and sustainability, and demystify the technology through clear, engaging messaging. In countries where such strategies have been used, consumers have shown increased willingness to try novel food technologies. This is significant because of predicted growth in the industry.

If South African consumers see 3D-printed food more positively, this innovation could unlock opportunities to enhance food security, address malnutrition, and support personalised dietary solutions.

Oluwafemi Adebo received funding for this project from the National Research Foundation (NRF) of South Africa Support for Rated and Unrated Researchers (grant number: SRUG2204285188), the University of Johannesburg and Faculty of Science Research Committee Grant, and the South African Medica lResearch Council (SAMRC) Self-Initiated Research (SIR) Grant.

Nicole Cunningham receives funding from the DHET in order to conduct academic research.

– ref. 3D printed food: yuck or yes? Researchers ask South African consumers – https://theconversation.com/3d-printed-food-yuck-or-yes-researchers-ask-south-african-consumers-255887

July 27, 2025

Young Nigerians learn about democracy at school: how it’s shaping future voters

Source: The Conversation – Africa (2) – By Leila Demarest, Associate Professor, Institute of Political Science, Leiden University

Democratic consolidation is a continuing struggle, in Africa as elsewhere. The turn to democracy gained momentum in Africa in the late 1980s and early 1990s but has petered out since. Can new generations turn the tide?

The need to prepare young people to become democratically minded is well established. In western societies, school-based civic education has been considered the means to do it since as early as the 1960s. The assumption is that better knowledge about the democratic functioning of the state promotes stronger democratic values and norms. It is also thought to increase trust in institutions and a willingness to participate in politics in the future.

Research in western settings indeed shows that classroom instruction strengthens political attitudes and behaviour. Yet can we expect civic education to work in the same way in newer democracies? In weak democracies studies have found that civic education could actually lead young people away from political participation. Young people may become more aware of the flaws of their own system and turn away from politics.

Nigeria made the move from military rule to multiparty democracy in 1999 but remains a flawed democracy struggling with political corruption, vote buying and episodic violence. Individual liberties are only weakly protected.

As Africa’s most populous democracy, with a big young population, Nigeria needs young people to participate in democratic politics. And they have done so, as can be seen from events like the #EndSARS protests. Nevertheless many youths also show voter apathy. Or they engage in the country’s well-known cycles of election violence.

As scholars, we have conducted extensive research on how young people in African countries can overcome some dark legacies, like violent conflict, ethnic tensions and authoritarianism. In a recent study, we focused on democratic engagement among young Nigerians and how formal education could strengthen it.

Our research among secondary school students in Lagos state shows promising results. A survey of over 3,000 final year students found that those with greater political knowledge and stronger democratic values were more likely to express intent to vote, contact officials, or protest in the future.

However, these same students rejected party membership and campaigning, which are commonly associated with corruption and violence in Nigeria. In contrast, students with lower levels of knowledge and democratic values remained inclined to participate in party activities. This might be to gain economic benefits.

These findings show that the core objectives of civic education are not likely to lead youth to abandon democratic politics. Fostering knowledge about how the system (ideally) works and strengthening democratic attitudes remains a valuable approach to achieving democracy.

Our findings

Ten years after the transition from military to democratic rule, the Nigerian government made civic education mandatory in primary and secondary schools. The curriculum covers issues such as Nigeria’s independence, the structures of the state, civic rights, political parties and national unity. It also covers corruption and clientelism (the exchange of political support for economic benefits).

After learning how the government works and gaining awareness of civic rights and responsibilities, would young Nigerians remain committed to political participation with all the country’s democratic flaws?

We conducted a survey among final year secondary school students in Lagos state in 2019. About 3,000 students across 36 randomly selected schools answered our questions. The results revealed three political participation profiles:

disengaged youth – those who do not wish to take part in any type of political activity
non-party activists – intent on voting, contacting politicians or officials and protesting, but they reject party membership and campaigning
party activists – interested in joining a political party and campaigning as well as voting, contacting politicians or officials and protesting.

Disengaged youths tended to come from richer socio-economic backgrounds. They showed low trust in institutions. Non-party activists were more informed and held stronger democratic values than party activists. This is likely because they saw political parties as corrupt or violent.

In a democracy where party politics are often tainted by corruption, the youths’ selective engagement may be a sign not of apathy but of a thoughtful and principled rejection of flawed party politics.

Despite a growing distrust in political parties, civic education does not appear to discourage pro-democratic political behaviour overall.

A ‘reverse’ participation gap

Schools are not the only shapers of youths’ political behaviour. Caregivers and peers play a role. In a large number of countries, youth from richer socio-economic backgrounds are more politically informed, more trusting of institutions, and active. This results in a so-called participation gap between richer and poorer citizens.

Where democracy is yet to take root, research shows that middle- and higher-middle class citizens also have higher levels of knowledge and stronger democratic norms. But they have lower levels of institutional trust and are less likely to participate in institutional politics. This presents a “reverse” participation gap, so to speak.

In our research, we found partial evidence of this “reverse participation gap”. Students from wealthier backgrounds were less likely to participate, but not necessarily because they had stronger democratic norms. One possible explanation is that these students were less economically dependent on the state. With no need to rely on public institutions for jobs or welfare, they might feel less of a need to engage with them.

Retreat from political participation

In non-established democracies, research shows that more educated citizens often are more critical of their governments. In Ghana and Zimbabwe, these citizens were less likely to participate in elections.

Concerning civic education programmes specifically, an intervention in the Democratic Republic of Congo showed that these programmes might increase political knowledge and commitment to democratic values, but also decrease satisfaction with democracy in their country.

School-based research from the continent is lacking. But studies examining school-based civic education in electoral democracies elsewhere also show a retreat from institutionalised political participation. This spans voting, party membership, campaigning, and contacting politicians.

Our study finds more optimistic results for civic education programmes in Africa. Youths with high knowledge and values – the core objectives of civic education – remain committed to democratic political behaviour.

Leila Demarest receives funding from Leiden University Fund (grant reference W19304-5-01).

Line Kuppens 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. Young Nigerians learn about democracy at school: how it’s shaping future voters – https://theconversation.com/young-nigerians-learn-about-democracy-at-school-how-its-shaping-future-voters-261030

July 27, 2025

Uganda’s land eviction crisis: do populist state measures actually fix problems?

Source: The Conversation – Africa (2) – By Rose Nakayi, Senior Lecturer of Law, Makerere University

Populism is rife in various African countries. This political ideology responds to and takes advantage of a situation where a large section of people feels exploited, marginalised or disempowered. It sets up “the people” against “the other”. It promises solidarity with the excluded by addressing their grievances. Populism targets broad social groups, operating across ethnicity and class.

But how does populism fare when it informs state interventions to address long-standing societal issues under capitalism? Do populist state measures – especially when launched by a politically powerful leader – deliver improvements for the stated beneficiaries?

As academics who have researched populism for years, we were interested in the implementation and outcomes of such policies and programmes. To answer these questions, we analysed a populist intervention by President Yoweri Museveni in Uganda to address rampant land conflicts. In 2013 he set out to halt land evictions.

What good came of this? Did it help the poor?

We analysed land laws, court cases, government statements and media reports and found that, for the most part, the intervention offered short-term relief. Some people returned to the land, but the underlying land conflict was unresolved.

This created problems that continue to be felt today, including land disputes and land tenure insecurity. The intervention also increased the involvement of the president and his agents personally in providing justice.

It didn’t make pro-poor structural changes to address the root of the problem.

Yet, the intervention had several political benefits:

it enhanced the political legitimacy of the president and state
it offered a politically useful response to a land-related crisis and conflict
it addressed broader criticisms over injustice and poverty by sections of the public and opposition leaders, some of whom (like Robert Kyagulanyi) also relied on populist rhetoric.

The promise to deal with land evictions “once and for all” has yet to be realised over a decade later. During Heroes Day celebrations on 9 June 2024, Museveni’s speech repeated his promise to stop evictions.

Such promises of getting a grip on and ending evictions via decisive state actions, including proposed new legal guidelines, were also made more recently, for example during Heroes Day 2025. This indicates that evictions – and state responses to them – remain a top issue on the political agenda ahead of Uganda’s 2026 election.

Persistent evictions

Evictions were rampant in the 2010s, especially in central Uganda’s Buganda region. They were driven by increased demand for land amid a growing population and legal reforms that seemed to protect tenants over landlords. Some landlords, desperate to free their land of tenants, were carrying out the evictions themselves.

The president condemned the evictions, but they continued. Soon, the number of evictees was in the thousands.

In response, Museveni set up a land committee within the presidency. He announced at a press conference in early 2013 that:

all evictions are halted. There will be no more evictions, especially in the rural areas. All evictions involving peasants are halted.

The dynamics of populism-in-practice

Museveni’s attempts to personally deal with evictions illustrate a continued power shift in Uganda, from institutions to the president’s executive units.

Despite its shortcomings, such as case backlogs, the judicial system offers an opportunity to present cases in a more neutral environment. It also allows parties to appeal decisions. This way, higher courts can correct errors where necessary.

The presidential land committee, we found, tended to be biased in favour of tenants, paying less attention to the landlords’ cases.

The president’s intervention wasn’t adequate to address the immediate causes and effects of the evictions, nor the root causes.

Those included land tenure insecurities. Due to legal reforms, land-rich landlords were unable to get rent at market value from tenants. Neither could they evict them lawfully where rent was in arrears.

In some cases, legal options such as land sales between landlords and tenants were applied. This was often to the detriment of tenants, especially where there was no neutral actor to oversee negotiations.

Land reforms need to be institutionalised and funded to deliver the intended outcomes. Otherwise, unlawful sales and evictions become a quick option for landlords.

Museveni’s populist initiative also unleashed new problems for beneficiaries. Some secured land occupancy in the interim but lived in fear of a relapse of conflict. Mistrust and scarred interpersonal relationships hampered cohesion in some communities. Disputes over land put political actors who would ideally be working together to restore calm at loggerheads.

Populism as power

The creation of populist presidential units has become routine in Uganda. More recently, Museveni created a unit to protect investors, which has resolved some investment-related land disputes. Another one was established to fight corruption. Both units remain very active.

Our research finds that the government needs these units and interventions for a number of reasons. It uses them to govern the country’s conflict-ridden economy and society. They allow the government to assemble a politically useful response to crises and to address some on-the-ground problems. They make the state look concerned and responsive to people’s needs. And they allow ruling party political actors to increase their popularity locally.

Museveni and his ruling party, the National Resistance Movement, therefore, benefit from a key aspect of populism. It allows the merging of disparate, competing and contradictory views, interests and demands of members of various societal classes and groups into a significantly simplified and uniform narrative that (potentially) speaks to all. This could mean: end corruption, end evictions, wealth for all, and so on.

A general election is due in early 2026. The steps Museveni has taken on evictions, and the units set up to fight corruption or protect investors, need to be seen with this political context in mind.

Museveni has put protecting people from evictions high on his government’s agenda. Speaking to party members in August 2024, he emphasised

the importance of adhering to the mass line, which prioritises the needs and rights of the masses over those of the elite.

In our view, this pre-election narrative signifies the continued political and social relevance of populism in today’s Uganda. This could result in heightened populist state activity in the run-up to and after the election.

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. Uganda’s land eviction crisis: do populist state measures actually fix problems? – https://theconversation.com/ugandas-land-eviction-crisis-do-populist-state-measures-actually-fix-problems-260512

July 27, 2025

Long-COVID, viruses and ‘zombie’ cells: new research looks for links to chronic fatigue and brain fog

Source: The Conversation – Africa (2) – By Burtram C. Fielding, Dean Faculty of Sciences and Professor in the Department of Microbiology, Stellenbosch University

Millions of people who recover from infections like COVID-19, influenza and glandular fever are affected by long-lasting symptoms. These include chronic fatigue, brain fog, exercise intolerance, dizziness, muscle or joint pain and gut problems. And many of these symptoms worsen after exercise, a phenomenon known as post-exertional malaise.

Medically the symptoms are known as myalgic encephalomyelitis or chronic fatigue syndrome (ME/CFS). The World Health Organization classifies this as a post viral fatigue syndrome, and it is recognised by both the WHO and the United States Centers for Disease Control and Prevention as a brain disorder.

Experiencing illness long after contracting an infection is not new, as patients have reported these symptoms for decades. But COVID-19 has amplified the problem worldwide. Nearly half of people with ongoing post-COVID symptoms – a condition known as long-COVID – now meet the criteria for ME/CFS. Since the start of the pandemic in 2020, it is estimated that more than 400 million people have developed long-COVID.

To date, no widely accepted and testable mechanism has fully explained the biological processes underlying long-COVID and ME/CFS. Our work offers a new perspective that may help close this gap.

Our research group studies blood and the cardiovascular system in inflammatory diseases, as well as post-viral conditions. We focus on coagulation, inflammation and endothelial cells. Endothelial cells make up the inner layer of blood vessels and serve many important functions, like regulating blood clotting, blood vessel dilation and constriction, and inflammation.

Our latest review aims to explain how ME/CFS and long-COVID start and progress, and how symptoms show up in the body and its systems. By pinpointing and explaining the underlying disease mechanisms, we can pave the way for better clinical tools to diagnose and treat people living with ME/CFS and long-COVID.

What is endothelial senescence?

In our review, our international team proposes that certain viruses drive endothelial cells into a half-alive, “zombie-like” state called cellular senescence. Senescent endothelial cells stop dividing, but continue to release molecules that awaken and confuse the immune system. This prompts the blood to form clots and, at the same time, prevent clot breakdown, which could lead to the constriction of blood vessels and limited blood flow.

By placing “zombie” blood-vessel cells at the centre of these post-viral diseases, our hypothesis weaves together microclots, oxygen debt (the extra oxygen your body needs after strenuous exercise to restore balance), brain-fog, dizziness, gut leakiness (a digestive condition where the intestinal lining allows toxins into the bloodstream) and immune dysfunction into a single, testable narrative.

From acute viral infection to ‘zombie’ vessels

Viruses like SARS-CoV-2, Epstein–Barr virus, HHV-6, influenza A, and enteroviruses (a group of viruses that cause a number of infectious illnesses which are usually mild) can all infect endothelial cells. They enable a direct attack on the cells that line the inside of blood vessels. Some of these viruses have been shown to trigger endothelial senescence.

Multiple studies show that SARS-CoV-2 (the virus which causes COVID-19 disease) has the ability to induce senescence in a variety of cell types, including endothelial cells. Viral proteins from SARS-CoV-2, for example, sabotage DNA-repair pathways and push the host cell towards a senescent state, while senescent cells in turn become even more susceptible to viral entry. This reciprocity helps explain why different pathogens can result in the same chronic illness. Influenza A, too, has shown the ability to drive endothelial cells into a senescent, zombie-like state.

What we think is happening

We propose that when blood-vessel cells turn into “zombies”, they pump out substances that make blood thicker and prone to forming tiny clots. These clots slow down circulation, so less oxygen reaches muscles and organs. This is one reason people feel drained.

During exercise, the problem worsens. Instead of the vessels relaxing to allow adequate bloodflow, they tighten further. This means that muscles are starved of oxygen and patients experience a crash the day after exercise. In the brain, the same faulty cells let blood flow drop and leak, bringing on brain fog and dizziness.

In the gut, they weaken the lining, allowing bits of bacteria to slip into the bloodstream and trigger more inflammation. Because blood vessels reach every corner of the body, even scattered patches of these “zombie” cells found in the blood vessels can create the mix of symptoms seen in long-COVID and ME/CFS.

Immune exhaustion locks in the damage

Some parts of the immune system kill senescent cells. They are natural-killer cells, macrophages and complement proteins, which are immune molecules capable of tagging and killing pathogens. But long-COVID and ME/CFS frequently have impaired natural-killer cell function, sluggish macrophages and complement dysfunction.

Senescent endothelial cells may also send out a chemical signal to repel immune attack. So the “zombie cells” actively evade the immune system. This creates a self-sustaining loop of vascular and immune dysfunction, where senescent endothelial cells persist.

In a healthy person with an optimally functioning immune system, these senescent endothelial cells will normally be cleared. But there is significant immune dysfunction in ME/CFS and long-COVID, and this may enable the “zombie cells” to survive and the disease to progress.

Where the research goes next

There is a registered clinical trial in the US that is investigating senescence in long-COVID. Our consortium is testing new ways to spot signs of ageing in the cells that line our blood vessels. First, we expose healthy endothelial cells in the lab to blood from patients to see whether it pushes the cells into a senescent, or “zombie,” state.

At the same time, we are trialling non‑invasive imaging and fluorescent probes that could one day reveal these ageing cells inside the body. In selected cases, tissue biopsies may later confirm what the scans show. Together, these approaches aim to pinpoint how substances circulating in the blood drive cellular ageing and how that, in turn, fuels disease.

Our aim is simple: find these ageing endothelial cells in real patients. Pinpointing them will inform the next round of clinical trials and open the door to therapies that target senescent cells directly, offering a route to healthier blood vessels and, ultimately, lighter disease loads.

Burtram C. Fielding works for Stellenbosch University. He has received funding from the National Research Foundation, South Africa and the Technology Innovation Agency.

Resia Pretorius is a Distinguished Research Professor at Stellenbosch University and receives funding from Balvi Research Foundation and Kanro Research Foundation. She is also affiliated with University of Liverpool as a Honorary Professor. Resia is a founding director of the Stellenbosch University start-up company, Biocode Technologies and has various patents related to microclot formation in Long COVID.

Massimo Nunes receives funding from Kanro Research Foundation.

– ref. Long-COVID, viruses and ‘zombie’ cells: new research looks for links to chronic fatigue and brain fog – https://theconversation.com/long-covid-viruses-and-zombie-cells-new-research-looks-for-links-to-chronic-fatigue-and-brain-fog-261108

July 26, 2025

Which wildfire smoke plumes are hazardous? New satellite tech can map them in 3D for air quality alerts at neighborhood scale

Source: The Conversation – USA (2) – By Jun Wang, Professor of Chemical and Biochemical Engineering, University of Iowa

Smoke from Canadian wildfires prompted air quality alerts in Chicago as it blanketed the city on June 5, 2025. Scott Olson/Getty Images

Canada is facing another dangerous wildfire season, with burning forests sending smoke plumes across the provinces and into the U.S. again. The pace of the 2025 fires is reminiscent of the record-breaking 2023 wildfire season, which exposed millions of people in North America to hazardous smoke levels.

For most of the past decade, forecasters have been able to use satellites to track these smoke plumes, but the view was only two-dimensional: The satellites couldn’t determine how close the smoke was to Earth’s surface.

The altitude of the smoke matters.

If a plume is high in the atmosphere, it won’t affect the air people breathe – it simply floats by far overhead.

But when smoke plumes are close to the surface, people are breathing in wildfire chemicals and tiny particles. Those particles, known as PM2.5, can get deep into the lungs and exacerbate asthma and other respiratory and cardiac problems.

An animation shows mostly green (safe) air quality from ground-level monitors. However, in Canada, closer to the fire, the same plume shows high levels of PM2.5. — An animation on May 30, 2025, shows a thick smoke plume from Canada moving over Minnesota, but the air quality monitors on the ground detected minimal risk, suggesting it was a high-level smoke plume.
NOAA NESDIS Center for Satellite Applications and Research

The Environmental Protection Agency uses a network of ground-based air quality monitors to issue air quality alerts, but the monitors are few and far between, meaning forecasts have been broad estimates in much of the country.

Now, a new satellite-based method that I and colleagues at universities and federal agencies have been working on for the past two years is able to give scientists and air quality managers a 3D picture of the smoke plumes, providing detailed data of the risks down to the neighborhood level for urban and rural areas alike.

Building a nationwide smoke monitoring system

The new method uses data from a satellite that NASA launched in 2023 called the Tropospheric Emissions: Monitoring of Pollution, or TEMPO, satellite.

A map shows blue over the Dakotas, Nebraska and western parts of Minnesota and Iowa. Pink is over Pennsylvania up through Maine. — Data from the TEMPO satellite shows the height of the smoke plume, measured in kilometers. Light blue areas are closest to the ground, suggesting the worst air quality. Pink areas suggest the smoke is more than 2 miles (3.2 kilometers) above the ground, where it poses little risk to human health. The data aligns with air monitor readings taken on the ground at the same time.
NOAA NESDIS Center for Satellite Applications and Research

TEMPO makes it possible to determine a smoke plume’s height by providing data on how much the oxygen molecules absorb sunlight at the 688 nanometer wavelength. Smoke plumes that are high in the atmosphere reflect more solar radiation at this wavelength back to space, while those lower in the atmosphere, where there is more oxygen to absorb the light, reflect less.

Understanding the physics allowed scientists to develop algorithms that use TEMPO’s data to infer the smoke plume’s altitude and map its 3D movement in nearly real time.

An illustration shows a satellite, Sun and smoke plume at different heights. Higher plumes reflect more light. — Aerosol particles in high smoke plumes reflect more light back into space. Closer to Earth’s surface, there is more oxygen to absorb light at the 688 nanometer wavelength, so less light is reflected. Satellites can detect the difference, and that can be used to determine the height of the smoke plume.
Adapted from Xu et al, 2019, CC BY

By combining TEMPO’s data with measurements of particles in the atmosphere, taken by the Advanced Baseline Imager on the NOAA’s GOES-R satellites, forecasters can better assess the health risk from smoke plumes in almost real time, provided clouds aren’t in the way.

That’s a big jump from relying on ground-based air quality monitors, which may be hundreds of miles apart. Iowa, for example, had about 50 air quality monitors reporting data on a recent day for a state that covers 56,273 square miles. Most of those monitors were clustered around its largest cities.

NOAA’s AerosolWatch tool currently provides a near-real-time stream of wildfire smoke images from its GOES-R satellites, and the agency plans to incorporate TEMPO’s height data. A prototype of this system from my team’s NASA-supported research project on fire and air quality, called FireAQ, shows how users can zoom in to the neighborhood level to see how high the smoke plume is, however the prototype is currently only updated once a day, so the data is delayed, and it isn’t able to provide smoke height data where clouds are also overhead.

Wildfire health risks are rising

Fire risk is increasing across North America as global temperatures rise and more people move into wildland areas.

While air quality in most of the U.S. improved between 2000 and 2020, thanks to stricter emissions regulations on vehicles and power plants, wildfires have reversed that trend in parts of the western U.S. Research has found that wildfire smoke has effectively erased nearly two decades of air quality progress there.

Our advances in smoke monitoring mark a new era in air quality forecasting, offering more accurate and timely information to better protect public health in the face of these escalating wildfire threats.

Prof. Wang’s group have been supported from NOAA, NASA, and Naval ONR to develop research algorithm to retrieve aerosol layer height. The compute codes of the research algorithm were shared with colleagues in NOAA.

– ref. Which wildfire smoke plumes are hazardous? New satellite tech can map them in 3D for air quality alerts at neighborhood scale – https://theconversation.com/which-wildfire-smoke-plumes-are-hazardous-new-satellite-tech-can-map-them-in-3d-for-air-quality-alerts-at-neighborhood-scale-259654

July 25, 2025

Neanderthals likely ate fermented meat with a side of maggots

Source: The Conversation – USA – By Melanie Beasley, Assistant Professor of Anthropology, Purdue University

Black soldier fly maggots can feed on decomposing animals. Melanie M. Beasley

Scientists long thought that Neanderthals were avid meat eaters. Based on chemical analysis of Neanderthal remains, it seemed like they’d been feasting on as much meat as apex predators such as lions and hyenas. But as a group, hominins – that’s Neanderthals, our species and other extinct close relatives – aren’t specialized flesh eaters. Rather, they’re more omnivorous, eating plenty of plant foods, too.

It is possible for humans to subsist on a very carnivorous diet. In fact, many traditional northern hunter–gatherers such as the Inuit subsisted mostly on animal foods. But hominins simply cannot tolerate consuming the high levels of protein that large predators can. If humans eat as much protein as hypercarnivores do over long periods without consuming enough other nutrients, it can lead to protein poisoning – a debilitating, even lethal condition historically known as “rabbit starvation.”

So, what could explain the chemical signatures found in Neanderthal bones that seem to suggest they were healthily eating tons of meat?

I am an anthropologist who uses elements such as nitrogen to study the diets of our very ancient ancestors. New research my colleagues and I conducted suggests a secret ingredient in the Neanderthal diet that might explain what was going on: maggots.

A close-up photograph of a black-colored fly with green and brown patterned eyes — A black soldier fly adult. The larvae of this fly are one of the species of maggots studied.
GordZam/iStock via Getty Images Plus

Isotope ratios reveal what an animal ate

The ratios of various elements in the bones of animals can provide insights into what they ate while alive. Isotopes are alternate forms of the same element that have slightly different masses. Nitrogen has two stable isotopes: nitrogen-14, the more abundant form, and nitrogen-15, the heavier, less common form. Scientists denote the ratio of nitrogen-15 to nitrogen-14 as δ¹⁵N and measure it in a unit called permil.

As you go higher up the food chain, organisms have relatively more of the isotope nitrogen-15. Grass, for example, has a very low δ¹⁵N value. An herbivore accumulates the nitrogen-15 that it consumes eating grass, so its own body has a slightly higher δ¹⁵N value. Meat-eating animals have the highest nitrogen ratio in a food web; the nitrogen-15 from their prey concentrates in their bodies.

By analyzing stable nitrogen isotope ratios, we can reconstruct the diets of Neanderthals and early Homo sapiens during the late Pleistocene, which ran from 11,700 to 129,000 years ago. Fossils from various sites tell the same story – these hominins have high δ¹⁵N values. High δ¹⁵N values would typically place them at the top of the food web, together with hypercarnivores such as cave lions and hyenas, whose diet is more than 70% meat.

But maybe something else about their diet was inflating Neanderthals’ δ¹⁵N values.

Uncovering the Neanderthal menu

We suspected that maggots could have been a different potential source of enriched nitrogen-15 in the Neanderthal diet. Maggots, which are fly larvae, can be a fat-rich source of food. They are unavoidable after you kill another animal, easily collectible in large numbers and nutritionally beneficial.

To investigate this possibility, we used a dataset that was originally created for a very different purpose: a forensic anthropology project focused on how nitrogen might help estimate time since death.

I had originally collected modern muscle tissue samples and associated maggots at the Forensic Anthropology Center at University of Tennessee, Knoxville, to understand how nitrogen values change during decomposition after death.

A photo of an animal carcass with maggots covering it — Maggots feeding on and decomposing an animal carcass.
Hari Sucahyo/iStock via Getty Images Plus

While the data can assist modern forensic death investigations, in our current study we repurposed it to test a very different hypothesis. We found that stable nitrogen isotope values increase modestly as muscle tissue decomposes, ranging from -0.6 permil to 7.7 permil.

This increase is more dramatic in maggots feeding on decomposing tissue: from 5.4 permil to 43.2 permil. To put the maggot values in perspective, scientists estimate δ¹⁵N values for Pleistocene herbivores to range between 0.9 permil to 11.2 permil. Maggots are measuring up to almost four times higher.

Our research suggests that the high δ¹⁵N values observed in Late Pleistocene hominins may be inflated by year-round consumption of ¹⁵N-enriched maggots found in dried, frozen or cached animal foods.

Cultural practices shape diet

In 2017, my collaborator John Speth proposed that the high δ¹⁵N values in Neanderthals were due to the consumption of putrid or rotting meat, based on historical and cultural evidence of diets in northern Arctic foragers.

Traditionally, Indigenous peoples almost universally viewed thoroughly putrefied, maggot-infested animal foods as highly desirable fare, not starvation rations. In fact, many such peoples routinely and often intentionally allowed animal foods to decompose to the point where they were crawling with maggots, in some cases even beginning to liquefy.

This rotting food would inevitably emit a stench so overpowering that early European explorers, fur trappers and missionaries were sickened by it. Yet Indigenous peoples viewed such foods as good to eat, even a delicacy. When asked how they could tolerate the nauseating stench, they simply responded, “We don’t eat the smell.”

A Neanderthal wearing animal fur butchering a goat with a stone tool — Reconstruction of a Neanderthal man butchering a goat at the Neanderthal Museum in Mettman, Germany.
Pressebilder Neanderthal Museum, Mettmann/Wikimedia Commons, CC BY-SA

Neanderthals’ cultural practices, similar to those of Indigenous peoples, might be the answer to the mystery of their high δ¹⁵N values. Ancient hominins were butchering, storing, preserving, cooking and cultivating a variety of items. All these practices enriched their paleo menu with foods in forms that nonhominin carnivores do not consume. Research shows that δ¹⁵N values are higher for cooked foods, putrid muscle tissue from terrestrial and aquatic species, and, with our study, for fly larvae feeding on decaying tissue.

The high δ¹⁵N values of maggots associated with putrid animal foods help explain how Neanderthals could have included plenty of other nutritious foods beyond only meat while still registering δ¹⁵N values we’re used to seeing in hypercarnivores.

We suspect the high δ¹⁵N values seen in Neanderthals reflect routine consumption of fatty animal tissues and fermented stomach contents, much of it in a semi-putrid or putrid state, together with the inevitable bonus of both living and dead ¹⁵N-enriched maggots.

What still isn’t known

Fly larvae are a fat-rich, nutrient-dense, ubiquitous and easily procured insect resource, and both Neanderthals and early Homo sapiens, much like recent foragers, would have benefited from taking full advantage of them. But we cannot say that maggots alone explain why Neanderthals have such high δ¹⁵N values in their remains.

Several questions about this ancient diet remain unanswered. How many maggots would someone need to consume to account for an increase in δ¹⁵N values above the expected values due to meat eating alone? How do the nutritional benefits of consuming maggots change the longer a food item is stored? More experimental studies on changes in δ¹⁵N values of foods processed, stored and cooked following Indigenous traditional practices can help us better understand the dietary practices of our ancient relatives.

Melanie Beasley received funding from the Haslam Foundation for this research.

– ref. Neanderthals likely ate fermented meat with a side of maggots – https://theconversation.com/neanderthals-likely-ate-fermented-meat-with-a-side-of-maggots-261628

July 25, 2025

Using cosmetics on babies and children could disrupt hormones and trigger allergies

Source: The Conversation – UK – By Adam Taylor, Professor of Anatomy, Lancaster University

Would you dab perfume on a six-month-old? Paint their tiny nails with polish that contains formaldehyde? Dust bronzer onto their cheeks?

An investigation by the Times has found that babies and toddlers are routinely exposed to adult cosmetic products, including fragranced sprays, nail polish and even black henna tattoos.

While these may sound harmless – or even Instagram-friendly – the science tells a more concerning story. Infant skin is biologically different from adult skin: it’s thinner, more absorbent and still developing. Exposure to certain products can lead to immediate problems like irritation or allergic reactions, and in some cases, may carry longer term health-risks such as hormone disruption.

This isn’t a new concern. A 2019 study found that every two hours in the US, a child was taken to hospital because of accidental exposure to cosmetic products.

Newborn skin has the same number of layers as adult skin but those layers are up to 30% thinner. That thinner barrier makes it easier for substances, including chemicals, to penetrate through to deeper tissues and the bloodstream.

Young skin also has a higher water content and produces less sebum (the natural oil that protects and moisturises the skin). This makes it more prone to water loss, dryness and irritation, particularly when exposed to fragrances or creams not formulated for infants.

The skin’s microbiome – its protective layer of beneficial microbes – also takes time to develop. By age three, a child’s skin finishes establishing its first microbiome. Before then, products applied to the skin can disrupt this delicate balance. At puberty, the skin’s structure and microbiome change again, altering how it responds to products.

The investigation found that bronzers and nail polish were being used on young children. These products often contain harmful or even carcinogenic chemicals, such as formaldehyde, toluene and dibutyl phthalate.

Toluene is a known neurotoxin, and dibutyl phthalate is an endocrine disruptor – a chemical that can interfere with hormone function, potentially affecting growth, development and fertility. Both substances can more easily pass through infants’ thinner, more permeable skin.

Even low-level exposure to formaldehyde, such as from furniture or air pollution, has been linked to higher rates of lower respiratory infections in children (that’s infections affecting the lungs, airways and windpipe).

Irritating ingredients

In the US, one in three adults experiences skin or respiratory symptoms after exposure to fragranced products. If adults are reacting, it’s no surprise that newborns and children with their developing immune systems are at even greater risk.

Perfumes often contain alcohol and volatile compounds that dry out the skin, leading to redness, itching and discomfort.

Certain skincare ingredients have also been studied for their potential to affect hormones, trigger allergies or pose long-term health concerns:

alkylphenols used in detergents and cosmetics may disrupt hormone activity
antimicrobials such as triclosan can interfere with thyroid hormones and contribute to antibiotic resistance
bisphenols, (BPA widely used in packaging are linked to hormone disruption.
cyclosiloxanes (D4 and D5) may accumulate in the body and affect hormonal balance
ethanolamines can react with other ingredients to form nitrosamines, some of which are potential carcinogens
parabens are preservatives that mimic oestrogen, though some studies suggest minimal risk at low doses
phthalates used in fragrances and plastics are linked to reproductive toxicity, especially in early-life exposures
benzophenone is found in many sunscreens and some forms may act as allergens and hormone disruptors.

While many of these ingredients are permitted in regulated concentrations, some researchers warn of a “cocktail effect”: the cumulative impact of daily exposure to multiple chemicals, especially in young, developing bodies.

Temporary tattoos

Temporary tattoos, particularly black henna, are popular on holidays but they aren’t always safe. Black henna is a common cause of contact dermatitis in children and may contain para-phenylenediamine (PPD), a chemical approved for use in hair dyes but not for direct application to skin.

PPD exposure can cause severe allergic reactions and, in rare cases, cancer. Children may develop hypopigmentation – pale patches where colour is lost – or, in adults, hyperpigmentation that can last for months or become permanent.

Worryingly, children exposed to PPD may experience more severe reactions later in life if they use hair dyes containing the same compound. This can sometimes lead to hospitalisation or even fatal anaphylaxis. Because of these risks, European legislation prohibits PPD from being applied directly to the skin, eyebrows, or eyelashes.

‘Natural’ doesn’t mean harmless

Products marketed as “natural” or “clean” can also cause allergic reactions. Propolis (bee glue), for instance, is found in many natural skincare products but causes contact dermatitis in up to 16% of children.

A study found an average of 4.5 contact allergens per product in “natural” skincare ranges. Out of 1,651 “natural” personal care products on the US market, only 96 (5.8%) were free from contact allergens. Even claims like “dermatologically tested” don’t guarantee safety; they simply mean the product was tested on skin, not that it’s free from allergens.

Babies and young children aren’t just miniature adults. Their skin is still developing and is more vulnerable to irritation, chemical absorption and systemic effects: substances that penetrate the skin can enter the bloodstream and potentially affect organs or biological systems throughout the body. Applying adult-targeted products, or even well-meaning “natural” alternatives, can therefore carry real risks.

Adverse reactions can appear as rashes, scaling or itchiness and, in severe cases, blistering or crusting. Respiratory symptoms like coughing or wheezing should always be investigated by a medical professional.

When in doubt, keep it simple. Limit what goes on your child’s skin, especially in the early years.

Get your news from actual experts, straight to your inbox. Sign up to our daily newsletter to receive all The Conversation UK’s latest coverage of news and research, from politics and business to the arts and sciences.

Adam Taylor 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. Using cosmetics on babies and children could disrupt hormones and trigger allergies – https://theconversation.com/using-cosmetics-on-babies-and-children-could-disrupt-hormones-and-trigger-allergies-261204