Thousands of employed Colorado workers need SNAP benefits to make ends meet

Source: The Conversation – USA (2) – By Jennifer C. Greenfield, Associate Professor of Social Work, University of Denver

In Colorado, even as the minimum wage has increased, thousands of workers still need food assistance. Mark Felix / AFP via Getty Images

In Colorado, more than 600,000 workers received benefits through the Supplemental Nutrition Assistance Program, known as SNAP, in October 2025. This federal program protects low-income children, disabled adults and workers from hunger by providing money to help them buy groceries.

Thousands of Coloradans employed by major corporations, including 2,300 Amazon workers and more than 1,000 workers at King Soopers, use SNAP benefits.

There are also hundreds of recipients who work for local organizations, including nearly 600 employees of the Denver Public Schools system, according to data I evaluated after it was obtained by The Conversation from the Colorado Department of Human Services.

“The findings are a sobering reflection of the economic pressures facing Denver Public Schools staff and K-12 educators everywhere,” said Scott Pribble, director of external communications for Denver Public Schools, in an email to The Conversation.

Denver Public Schools offers some of the highest teacher pay in Colorado and has a minimum hourly rate of $20 for all staff, according to Pribble.

“While we are proud of our current compensation packages, we recognize the need to do more. We are constantly striving to provide higher wages for all staff members,” Pribble wrote.

The data provided by the state has limitations. It does not show how many hours each SNAP recipient works — so we don’t know how many of the workers mentioned above are part-time or seasonal employees.

But the reality is that even full-time workers can receive SNAP benefits. Workers earning at or near the state minimum wage often qualify because their wages, even for full-time work, are still low.

As a social work researcher, I study policies that support working families. I have examined how health and household economic security are affected by paid family and medical leave, universal basic income and childcare subsidies for low- and middle-income workers.

A national problem that’s acute in Colorado

More than 16 million workers across the U.S. rely on programs like SNAP to fill in the gaps.

The U.S. Government Accountability Office reported in October 2020 that more than two-thirds of people in the SNAP program work full time for 50 or more weeks per year. Using data I obtained from the U.S. Census Bureau, I confirmed that in 2024 there were more than 254,000 Colorado workers who received SNAP benefits, and they worked an average of 35 hours per week at an average of around $17.70 per hour.

The reason so many full-time workers still rely on SNAP is rooted in a fundamental gap between wages and the cost of living. Even a single adult with no dependents working 40 hours a week at Colorado’s minimum wage, which is $15.16 per hour, may qualify for SNAP benefits. In fact, earning the state minimum wage and working 52 weeks, they would qualify if they missed just 14 hours of work in the entire year. Colorado law requires employers to provide a maximum of 48 hours of paid sick time to minimum wage workers, but more than half of workers at the minimum have no paid vacation time. As a result, missing more than seven days of work in a year due to illness or other unavoidable circumstances could push wages low enough to qualify a single worker for SNAP.

Households with dependents qualify for SNAP at even higher wages than the state minimum because the annual income threshold, which is $31,320 for a single worker with no dependents, rises with household size.

In short, the state-mandated minimum wage is simply inadequate to meet families’ basic needs, and many full-time workers must rely on SNAP to put food on the table.

Some employers, like Amazon, point to the federal minimum wage, and the differences in SNAP eligibility from state to state, as the root cause of the issue.

“Amazon pay is among the best in the industry – well over double the federal minimum wage and significantly more than other retailers,” said Eileen Hards, an Amazon spokesperson, in an email. “As we’ve said for years, what really needs to happen is a significant and large increase in the federal minimum wage — that would be a big boost for American families.”

With the federal minimum wage set at $7.25 per hour, a rate established in 2009, doubling the minimum wage would still qualify many full-time Amazon workers for SNAP in 28 states, including Colorado.

Colorado cost of living soars

Ten years ago, Colorado voted to increase the state’s minimum hourly wage. Voters had already approved a constitutional amendment in 2006 tying the minimum wage to the cost of living, and the 2016 ballot initiative established a new floor of $12 per hour, starting in 2020, which would increase annually to keep pace with inflation. Since the 2016 vote, as costs have soared, the minimum wage has kept pace with the official consumer price index for Colorado, rising from $12 in 2020 to $15.16 in 2026.

Some Colorado cities have increased it further. For instance, Denver’s minimum wage is $19.29, and Boulder’s is $16.82.

Employers like Amazon and Kroger, which operates King Soopers, offer higher wages than the state and local minimum wages. Kroger, which employs 24,000 people in Colorado, has an average hourly wage of $24.58 and approximately $32 an hour when benefits are included, according to Jessica Trowbridge, head of corporate affairs at King Soopers.

“Our associates also have an average tenure of 16 years, reflecting the meaningful, long-term career opportunities we strive to provide,” she said in an email to The Conversation. “Additionally, supporting the communities we serve is central to our mission, and within a year we’ve donated more than 27 million meals locally to help address food insecurity.”

But Colorado’s cost of living has risen faster than the U.S. average, and even with yearly cost-of-living increases to the state’s minimum wage, wages are not high enough to pay for basic needs. The Living Wage project at MIT estimates that a single worker with no dependents in Colorado needs $26 per hour to meet their basic needs, while a family with two workers and two children needs $34.04 per hour per worker.

Meanwhile, the median wage across all households in Colorado is $23.77 per hour.

The mismatch between incomes and the cost of living is not only a problem for families trying to make ends meet. It is increasingly a problem for state budgets as well, especially as changes to the SNAP program, passed by Congress in 2025, take effect. An estimated 298,000 Coloradans will lose some or all SNAP benefits by January 2027 due to changes passed as part of tax and spending bill in July 2025. The changes will also add an estimated $178 million to the Colorado state budget by shifting costs from the federal budget to states.

The broad eligibility for SNAP among even full-time workers highlights a fundamental issue: At the current minimum wage, workers are not making enough to pay for essentials like housing, food and childcare. Those with dependents face especially difficult choices about how to juggle working and parenting, especially when childcare alone costs $1,645 per month in some counties in Colorado – or about two-thirds of the income of a full-time worker earning the minimum wage in the state.

The U.S. enacted a minimum wage in 1938 to mirror other countries, but the law didn’t specify when or how often the wage should be adjusted.

Colorado, and the U.S. overall, has a wage problem. Costs continue to rise, while incomes, even in states that have adjusted minimum wage guidelines, increasingly fail to bring households out of poverty.

Policymakers face a tough set of questions. Is adjusting the minimum wage the answer? Should major employers be held accountable when their employees rely on taxpayer-funded public programs to fill the gap between their paychecks and the cost of their basic needs? Or do other policy levers hold more potential to close the gap between incomes and household costs?

As Americans watch prices rise at the gas pump and on grocery store shelves, answers to these important questions are urgently needed.

Read more of our stories about Colorado.

The Conversation

Jennifer Greenfield received funding from the Colorado Women’s College and the Women’s Foundation of Colorado to support research on the 2016 minimum wage ballot initiative mentioned in this article. She currently receives funding from the Women’s Foundation of Colorado to support research on women’s wellbeing in the state.

ref. Thousands of employed Colorado workers need SNAP benefits to make ends meet – https://theconversation.com/thousands-of-employed-colorado-workers-need-snap-benefits-to-make-ends-meet-277826

Trump’s Medicaid fraud crackdown may sound sensible, but it could harm Americans who require long-term care

Source: The Conversation – USA (3) – By Marc Cohen, Professor of Gerontology, UMass Boston

U.S. Vice President JD Vance listens as Mehmet Oz, the administrator for the Centers for Medicare & Medicaid Services, speaks about healthcare fraud. Alex Wong/Getty Images

Mehmet Oz, the Centers for Medicare & Medicaid Services administrator, is ordering all states to step up their efforts to crack down on Medicaid fraud.

His April 21, 2026, announcement expanded on the Trump administration’s related enforcement actions, such as withholding Medicaid funds from Minnesota and threatening to do that for New York, California and Maine.

The Trump administration says there’s a big problem with fraud tied to government-funded care delivered in a person’s home or in the community, officially known as home and community-based services, along with nonmedical transportation, behavioral health and new or high billing providers.

The agency Oz leads is now asking states to immediately “revalidate” providers they claim are “high risk.” That is, states are supposed to require providers to prove that they remain eligible to participate in Medicaid and bill the program. The providers primarily offer at-home care, transportation, behavioral health and other services.

Related legislative initiatives, sponsored by Republicans, are also pending in Congress.

We are health services researchers who study the development and growth of the Medicaid home and community-based services program. One of us (Barkoff) previously served in the role of administrator and assistant secretary for aging of the Administration for Community Living.

We strongly believe that it is sensible and necessary for the government to take steps to prevent, root out and punish Medicaid fraud. But we are mindful that the government’s anti-fraud strategies and tactics could unnecessarily disrupt the very services that people depend on day to day.

We aren’t alone. Many researchers, advocates and policy experts are alarmed by this White House policy.

What’s at stake

All told, Medicaid provides health insurance coverage for about 75 million low-income Americans, including many who are at least 65 years old.

More than 5 million Americans benefit from government-funded home care, which is aimed at keeping low-income people with disabilities and frail older people living in their own homes and communities. Medicaid pays for most home care, covering nearly two-thirds of all such spending in 2023.

When home care works well, people become less likely to have to move into nursing homes or other assisted living facilities. If a home care aide doesn’t show up, the consequences are immediate and can be dire.

An older adult may be unable to get out of bed. A person with disabilities may miss meals or medications. A family caregiver may have to take time off without notifying their employer in advance and lose wages.

That’s why the federal government’s actions – particularly those targeting services provided in a person’s home or community – could endanger millions of people.

A home health aide helps a patient walk around a private home.
By helping low-income older people pay for home health aides, Medicaid makes it possible for many Americans to stay in their own residences instead of having to relocate to a professional care facility.
FG Trade Creative/E+ via Getty Images

Supreme Court ruling

Home and community-based services include help with bathing, dressing, eating, medication management and mobility – services that allow people to remain in their homes rather than moving into nursing facilities. A shift toward home-based care has been underway for decades, driven by both costs and civil rights protections.

One reason for the shift was the 6-3 ruling in 1999 by the Supreme Court in the Olmstead v. L.C. case. The majority affirmed the right of people with disabilities to live in their own homes and communities when possible.

Today, most Medicaid long-term care spending covers the cost of services provided in a person’s home or local community, rather than in an institution. These services cost less and lead to better outcomes. Research and program data consistently show that fraud in these programs is relatively rare.

This is especially true due to safeguards like electronic visit verification, which ensures providers are actually providing services in the home.

Another safeguard in place is that most states contract with and approve
fiscal intermediaries, which act as payroll, payment and compliance managers, to make sure that there are verifiable records, payment controls and audit trails in place for the Medicaid program.

Not all ‘improper payments’ are fraudulent

A central problem in the Trump administration’s strategy to root out alleged Medicaid fraud is a basic mischaracterization of many things as fraud that aren’t fraudulent.

Federal agencies are tracking “improper payments” and incorrectly equating them with fraud. The Centers for Medicare & Medicaid Services makes clear that most improper payments stem from documentation errors or administrative issues – not intentional wrongdoing.

The Government Accountability Office, a nonpartisan government agency that produces in-depth research, notes that while fraud does lead to improper payments, the reverse is not necessarily true. That is, improper payments can have a cause besides fraud, such as administrative errors and eligibility processing mistakes.

Blurring the distinction between improper payments and fraud can make it seem like providers are illegally taking advantage of the system. And when that happens, policymakers may turn to blunt solutions that do little to punish actual fraudsters, such as cutting or withholding funding, rather than fixing administrative problems.

Exaggerating the scope of Medicaid fraud

In our view, proposals to overhaul Medicaid’s enforcement methods should be grounded in strong and objective data. Yet much of the argument for structural reform relies on anecdotal examples, isolated cases and select audit findings without broader context.

One of the more egregious cases perpetrated by providers was a home care agency in Pennsylvania that billed fraudulent claims between 2020-2023 totaling US$1.8 million. Another was the Minnesota provider penalized in 2025 after billing for services not delivered.

But those infractions do not justify characterizing an entire category of services that helps tens of millions of Americans remain in their homes as rife with fraud and in need of dramatic changes.

By contrast, as we explained in Health Affairs ForeFront in March 2026, federal oversight bodies – including the Centers for Medicare & Medicaid Services, the Government Accountability Office and the Health and Human Services’ inspector general – produce systematic, data-driven analyses.

These sources consistently caution against equating improper payments with fraud and emphasize targeted approaches to program integrity.

The government designated some 6% of the annual payments by Medicaid as improper payments between 2022-2025, which were worth about $37 billion. Yet, more than 3 in 4 improper payments resulted from insufficient documentation, which usually doesn’t indicate fraud or abuse.

What’s more, Medicaid fraud is regularly subject to enforcement actions. In 2025, Medicaid fraud control units reported 1,185 convictions for fraud nationwide, and combined recoveries from criminal and civil cases totaled about $2 billion.

Emphasis on high-profile cases

Again, a few widely publicized fraud cases in Minnesota and a few other states do not prove that fraud is a chronic problem for Medicaid billing in home care programs.

In an agency as big as Medicaid, which spends nearly $1 trillion annually, some level of fraud will occur. The key question is whether fraud is widespread, systemic or goes unpunished.

Available evidence suggests Medicaid fraud is none of those things.

For example, large-scale home care programs serving hundreds of thousands of people report extremely low rates of confirmed fraud cases. Enforcement data from Medicaid Fraud Control Units, which investigate and prosecute Medicaid fraud, show that when fraud occurs, it is investigated and prosecuted.

In other words, the presence of enforcement activity is evidence that oversight systems are working – not that they’re failing.

A better approach

We believe that many strategies that are better than those that the Trump administration is embracing are readily available. Some examples include improved data analytics, stronger referral systems within managed care plans, enhanced provider screening and documentation standards, and continued support for Medicaid Fraud Control Units.

These approaches target fraud directly without jeopardizing access to the essential Medicaid services that help tens of millions of older adults and disabled people remain where they want to be: in their own homes instead of in more expensive nursing homes.

Given that the U.S. spends about $930 billion a year on the program, we don’t question the wisdom of engaging in its oversight.

But we are concerned that the policy response to alleged fraud could harm the very people that the Trump administration says its efforts are meant to protect.

The Conversation

Marc Cohen receives funding from the RRF Foundation for Aging.

Alison Barkoff receives funding from the Commonwealth Fund.

Jane Tavares receives funding from the RRF Foundation for Aging.

Sara Rosenbaum receives funding from the Commonwealth Fund.

ref. Trump’s Medicaid fraud crackdown may sound sensible, but it could harm Americans who require long-term care – https://theconversation.com/trumps-medicaid-fraud-crackdown-may-sound-sensible-but-it-could-harm-americans-who-require-long-term-care-281500

Reclassification of marijuana opens doors for much-needed medical research into the benefits and risks of the drug

Source: The Conversation – USA (3) – By Carey S. Cadieux, Associate Professor of Nursing, Binghamton University, State University of New York

The new federal classification of marijuana regulates only medical use; recreational use is still determined by state laws. tvirbickis/iStock via Getty Images Plus

When the U.S. Department of Justice moved to reclassify medical marijuana to a Schedule III drug on April 23, 2026, it set the stage for a vast amount of medical research that has been hobbled for decades by its more restrictive Schedule I classification.

The Justice Department also called for an expedited federal rescheduling process, with proceedings expected to begin in late June 2026, but for now cannabis at the federal level remains a Schedule I drug.

I’m an associate professor of nursing and I edited a textbook for nurses about providing care with cannabis. Cannabis is the umbrella term for the plant genus that includes both marijuana and hemp – two varieties of the same plant distinguished primarily by their content of THC, one of the active components of cannabis.

Moving cannabis to a Schedule III drug ushers in the end of the cannabis prohibition era and the beginning of the regulation era, potentially creating promising opportunities around research and new therapeutics.

A man working in a cannabis shop reaches for a cannabis plant in a black pot.
Cannabis is a genus of flowering plants that includes marijuana and hemp.
halbergman/iStock via Getty Images Plus

How are drugs regulated by ‘schedule’?

The Controlled Substances Act of 1970 categorizes all substances regulated under existing federal law into one of five schedules. The act regulates the manufacturing, importation, possession, use and distribution of substances on each schedule.

Several factors determine schedule placement, including the drug’s medical use, scientific evidence of its benefits and pharmacological effects, patterns and history of abuse, public health risk level, degree of physical or psychological addiction potential, and whether the drug can be used to make another controlled substance.

The Drug Enforcement Administration’s rescheduling of marijuana will move it from its current classification as a Schedule I drug, defined as having a high risk for abuse and no accepted medical use, to a Schedule III drug under the Controlled Substances Act. While still tightly regulated, Schedule III drugs are considered to have moderate to low risk for physical and psychological dependence and to have some medical benefits.

Other Schedule I drugs include heroin, psilocybin, LSD, peyote and MDMA, or ecstasy. These drugs cannot be dispensed or prescribed, with some exceptions. Current Schedule III drugs include ketamine, anabolic steroids, testosterone, products with less than 90 milligrams of codeine per dosage unit and some cannabinoids.

The move to reclassify medical marijuana products as Schedule III drugs applies only to those products certified by state-level medical cannabis programs. All other cannabis products remain a federal Schedule I drug, including those available from states’ recreational cannabis programs.

Impacts of cannabis reclassification

This legal order acknowledges that medical marijuana has some medical value and asserts that it has a lower potential for abuse than under the previous Schedule I classification.

The reclassification also ensures that state-registered medical cannabis patients continue to be permitted to purchase medical cannabis products without changes to their current certification or recommendation.

One of the challenges with this new law is that states have not standardized medical cannabis regulations, and each state will have its own quality and testing standards. In Maine, for instance, medical cannabis is not tested for molds, fungus, heavy metals or pesticides, while recreational cannabis is.

This means that the Schedule III medical cannabis in Maine could be contaminated, while the state’s testing of recreational cannabis makes it much safer to consume.

Selection of cannabis products at a legal retail store.
The reclassification of cannabis will enable researchers to study the wide array of products in states where cannabis is legal.
Zenkyphoto/iStock via Getty Images

What are the implications for marijuana research?

For decades, researchers have struggled to conduct high-quality research studies due to their lack of access to the cannabis products that patients actually use and restrictions on their processes.

With the reclassification, researchers who are registered with the DEA to research cannabis will be able to obtain cannabis flower and plant material, as well as manufactured cannabis products, such as tinctures and edibles, directly from state-licensed businesses that are DEA-registered.

This means researchers will no longer need to rely on the federal DEA registry for access to cannabis products for research, which were often inferior in quality and variety in comparison to the everyday products medical cannabis patients typically have access to. Instead, they will be able to study cannabis products that patients use in daily life, such as vapes and various edible products.

This shift in access will now allow researchers to undertake the gold standard of research approaches: the randomized controlled trial.

Randomized controlled trials will help researchers like my colleagues determine how effective cannabis is in treating people with complex medical needs. This includes patients who experience nausea and pain while undergoing cancer treatments, multiple sclerosis patients with severe muscle spasm and stiffness, and chronic pain patients who strive to find relief without using opioids.

Might rescheduling send mixed signals?

Rescheduling may lead people to believe that cannabis is safe for all people to consume.

However, a growing body of research points to possible adverse effects from cannabis use, particularly in vulnerable groups, such as people who are pregnant, adolescents, people with preexisting mental health conditions such as schizophrenia or psychosis, and those with cardiac issues.

Cannabis can also lead to adverse drug interactions. Therefore, medical patients should use it with discretion and under the guidance of a healthcare professional.

For most medical cannabis patients, THC doses should start low and gradually be increased.

Rescheduling will be a big step toward helping researchers build a greatly needed solid body of evidence around both the benefits and potential harms of cannabis. But rescheduling should not be interpreted as a signal that cannabis is harmless.

The Conversation

Carey S. Cadieux is affiliated with the American Cannabis Nurses Association as a volunteer who consults with them on federal and state-level cannabis policy, and the editor of the textbook Cannabis: A handbook for nurses, published by Wolters Kluwer.

ref. Reclassification of marijuana opens doors for much-needed medical research into the benefits and risks of the drug – https://theconversation.com/reclassification-of-marijuana-opens-doors-for-much-needed-medical-research-into-the-benefits-and-risks-of-the-drug-281403

School boards and universities will both be affected by Ontario’s Bill 101 sweeping changes

Source: The Conversation – Canada – By Louis Volante, Distinguished Professor, Faculty of Education, Brock University

The Ontario government recently introduced Bill 101, the Putting Student Achievement First Act that the province says intends to move “Ontario toward a more accountable, consistent and modern model of high-quality education.”

Given that I was a member of the faculty advisory group that helped develop Ontario’s current assessment, evaluation and reporting policies, I was naturally interested in seeing what this new bill entails and the implications for our provincial education system.

Unfortunately, the bill in its current form is likely to create new challenges with implications both for public schools serving children and youth as well as for university Faculties of Education aiming to prepare the next generations of teachers.




Read more:
What Ontarians need to know about ‘student achievement’ reforms that will run school boards like businesses


More, not less, data needed

Effective teaching and learning are dependent on having timely data related to how students are doing and the working conditions of educators. My own research has demonstrated that education systems that collect and monitor detailed data on their students are better positioned to track learning outcomes and respond accordingly.

Effective teaching and learning depend on having timely data, but Ontario plans to scrap the requirement for boards to administer surveys that gauge important issues such as students’ sense of belonging.

Under Ontario reforms, school boards would no longer be legally required to administer the school climate survey — surveys that gauge students’ sense of belonging in schools, reported bullying and engagement in extra-curricular activities.

They often ask questions related to school safety, engagement, health and well-being, self-efficacy and other factors known to support learning in a safe and inclusive environment.

The argument that there are too many inconsistencies across schools regarding how these surveys are constructed and administered as a rationale for eliminating them as a mandatory requirement does not hold.

Ironically, these inconsistencies underscore the need to develop a provincewide survey that all schools would administer to provide comparative data. I guess if you don’t collect data that shows there’s a problem, then you don’t have a problem.

But school climate surveys point to what might otherwise appear as intangible factors that make for a meaningful and effective education.




Read more:
In 2025 and beyond, schools need to teach more than just ‘the basics’


A sense of belonging and “non-cognitive” skills like having a flexible mindset directly relate to overall student achievement, partly explain performance patterns across countries, including Canada.

These surveys provide an oversized return on the investment needed for their development, analysis and monitoring.

More nuanced approach to attendance

Bill 101 has an explicit focus on providing students across Ontario with more consistent and effective learning experiences.

To achieve consistency in grading practices, it will mandate attendance and participation being worth 15 per cent of the final course mark for Grades 9 to 10 and 10 per cent for Grades 11 to 12.

To its credit, the government has qualified that this new policy will not be negatively impacted for excused absences, such as illnesses and holy days. However, some researchers who have examined absenteeism caution that many factors influence whether an absence is recorded as excused.

Certainly, measures to boast student engagement are laudable, but the policy could undoubtedly result in teachers merely generating a grade by simply counting up missed classes.

A more nuanced approach is needed — one that connects this new requirement more closely to curriculum expectations. For example, participation can and should be assessed in relation to the oral communication expectations that already exist within Ontario’s curriculum.

More detail needed on resources

The government has also indicated that it will be providing online classroom resources This will be welcome by many educators, particularly novice teachers, who may be struggling to find suitable materials to help them teach lessons and units of study.

Nevertheless, specifics are needed — namely, will these resources be developed and approved by teachers and subject experts, or simply become the purview of for-profit companies?

Ultimately, Ontario’s curriculum and teaching resources should be based on the expertise of educators.

Post-secondary changes

Given that I work in a Faculty of Education with one of the largest teacher education programs in the country, I was also concerned to find that amendments to Schedule 4 of the bill related to the Ontario College of Teachers Act suggests the province is preparing to exert stronger influence over teacher education programs.

While the province has already signalled an intent to drop the length of teachers’ college to a year, the wording of the bill mentions “addressing any other matter relating to the design, delivery or learning outcomes of professional teacher education programs.”

Another part of proposed reforms oddly bundled under Bill 101 involve plans for the province to absorb the Higher Education Quality Council of Ontario (HEQCO). The council’s mandate has been “bringing evidence-based research to the continued improvement of the post-secondary education system in Ontario,” and it’s also been charged with reporting on the government’s “free speech” on campus policy.

These disconcerting proposed shifts signal interference in universities, including traditional roles of academic review committees and university senates, which approve all new programs and amendments. This threatens university governance.

Publicly assisted, post-secondary study

This encroachment is unwarranted, particularly in Ontario, which has become a “publicly assisted,” instead of a “publicly funded,” system. That is: tuition revenues have surpassed government operating grants, meaning university students pay the largest relative proportion of their education.

The Ontario government provides a significant contribution, just under 40 per cent, but far less than other provinces.

I wonder which private-sector company would allow a minority shareholder group to override the wishes of the other shareholders and exert ultimate authority over key decisions?

Moving forward

The Ontario government has the ability to clarify and amend aspects of this bill.

In the absence of the latter, it falls short of putting students first, and it certainly could mark a terrible precedent for school board and university governance.

Although education policies can help address problems, on the surface, Bill 101 appears to have created new ones.

The Conversation

Louis Volante receives funding from the Social Sciences and Humanities Research Council of Canada (SSHRC).

ref. School boards and universities will both be affected by Ontario’s Bill 101 sweeping changes – https://theconversation.com/school-boards-and-universities-will-both-be-affected-by-ontarios-bill-101-sweeping-changes-281412

Worried about food prices? Investment in public infrastructure pays

Source: The Conversation – Canada – By Sarah Elton, Assistant Professor, Eakin Chair in Critical Qualitative Health Research Methodology, University of Toronto

If you’ve been to the supermarket recently, you know food prices are high. Politicians looking for a fix are considering government-run grocery stores.

Toronto city council recently voted to approve a public grocery store pilot, a policy made famous by New York City Mayor Zohran Mamdani. Newly elected federal NDP leader Avi Lewis’s platform also included public supermarkets.

The idea of a government-run store might seem like an appealing political response and a simple solution. Some argue the government’s buying power could secure lower food prices.

But the idea is just that: simple. It assumes the problem is merely retail margins, ignoring many other factors that determine food prices, like what’s available for sale, how it gets there, where it’s grown, who grows it and all the other stages of production.

The infrastructure behind your produce

Instead of looking only to public supermarkets, governments need to employ a food-systems perspective and look for solutions in time-tested ways — ways that governments have already invested in infrastructure commons. One such example is the Ontario Food Terminal.

The terminal is situated north of Toronto’s Gardiner Expressway in the inner suburb of Etobicoke. It’s one of the largest wholesale food terminals in North America and the only such public facility in Canada.

As a wholesale market, it serves dealers, wholesalers and farmers who sell fresh fruits and vegetables to clients, including restaurants, supermarkets, food banks and other organizations.

If you enjoy fresh fruits and vegetables in the Toronto area — whether from a corner fruit stand, a grocer or a supermarket that isn’t a major chain or franchise — you likely consume food that has passed through the terminal.

This public infrastructure supports a variety of food businesses that would otherwise struggle to compete with the buying power of major supermarket chains.




Read more:
Public grocery stores won’t fix Canada’s food affordability crisis


Public investment built the food system

It’s easy to overlook the key role the government has played in making the food terminal possible.

After the Second World War, when farmers struggled to sell their crops at prices that could support their livelihoods, the Ontario government recognized a role for itself in the food system. What followed was nearly a decade of preparatory work by a professional civil service.

This effort was funded by taxpayer dollars and involved a variety of institution-building tasks. These included drafting the Ontario Food Terminal Act, establishing a board to operate the facility, selecting an appropriate location and designing the site. Experts helped select land that could connect to both rail lines and the expanding North American highway network, which was also the result of government investments.

A civil servant named George Frank Perkin was the visionary behind this project, working under a Conservative government that strongly supported the idea. The Ontario Food Terminal Board secured funding in the form of a bond from Ontario Hydro’s pension fund to complete the project.

Today, the terminal is financially self-sufficient, covering its operating costs through rents and fees charged to the businesses that use its infrastructure. However, the public investment that established it — such as legislation, civil service and institutional design — laid the groundwork for everything that followed.

It remains a lasting example of how government can influence a food system without operating a single store.

Lower prices start long before the checkout

Our research on urban food systems shows that public infrastructure investment supports food access across Toronto and Ontario. More than 70 years later, the terminal still fulfils its original goal of connecting Ontario farmers with city buyers while also functioning as a marketplace for produce from around the world.

When we tracked fruit and vegetable prices through the terminal to small independent retailers, we found them selling for significantly less than at major chain supermarkets. Many common produce items were 20 to 40 per cent cheaper at independent green grocers than at large chains — savings that are critical, as 25.5 per cent of Canadians currently face food insecurity.

A public supermarket makes an eye-catching headline. However, if we want lasting, meaningful change in food prices and food security, we need to consider the entire system rather than a narrow focus on downstream retail.

Infrastructure like the terminal demonstrates that the supply chains and systems that deliver food to the city influence what we buy, who we buy from and the cost.

There are many more policy levers for the government beyond opening a public grocery store. We can build more wholesale markets like the terminal in other jurisdictions, as well as public cold-storage and processing hubs to enable small- and mid-scale farms and food businesses to compete in a highly consolidated food sector.

Governments can create a public market action plan, like the City of Toronto recently established, and invest in infrastructure that links producers to the communities most at risk of food insecurity.

These might not be simple solutions, but they do prioritize the public good more holistically than the idea of a government-run supermarket.

The Conversation

Sarah Elton receives funding from the Social Sciences and Humanities Research Council and the Meighen Family Foundation.

Aparna Raghu Menon receives doctoral funding from the Social Sciences and Humanities Research Council and the Burstow Award Foundation.

ref. Worried about food prices? Investment in public infrastructure pays – https://theconversation.com/worried-about-food-prices-investment-in-public-infrastructure-pays-280527

What courage is, how to build it and why you should take a risk

Source: The Conversation – USA (3) – By Gregory Crawford, President, Miami University

Courage demands that we evaluate an action’s goals and risks. Elisa Schu/picture alliance via Getty Images

From ancient epics to contemporary headlines, humans have spent centuries canonizing courage as a rare and admirable virtue. Aristotle writes, “You will never do anything in this world without courage.” But what does it really mean to be courageous, and what does it look like in a classroom or a checkout line?

On April 1, 2026, The Conversation hosted a webinar examining the virtue of courage. Panelists Greg Crawford, president of Miami University, and Cynthia Pury, professor of psychology at Clemson University, discussed the different ways we understand courage, how it can be built and why it is a worthwhile risk to take.

Crawford has leveraged his academic role to elevate entrepreneurship education, innovative research and entrepreneurial startups at Brown University, the University of Notre Dame and Miami University. Pury has consulted on courage with numerous national and international organizations. The webinar has been edited and condensed for print.

Beth Daley: What are the ingredients of courage?

Greg Crawford: I would break courage down into three areas: taking calculated risks, accepting the possibility of failure and taking action. That sometimes means choosing principles that you’re going to uphold no matter what because it’s a matter of purpose or mission. To quote Maya Angelou: “Courage is the most important of all the virtues, because without courage you can’t practice any other virtue consistently.”

April 1 webinar led by The Conversation U.S. Executive Editor Beth Daley examining the virtue of courage.

I think the first component or ingredient of courage would be clarity of purpose. Courage isn’t just about action, it’s about a directive action. The second ingredient would be realistic awareness of that risk. You’re not trying to minimize risk nor exaggerate the danger; you’re trying to be balanced so as to understand the consequences of that decision. Finally, courage includes the willingness to act despite fear. We make these decisions, and it’s more about resolve. Fear is never absent in the face of courage.

BD: Are you born with courage, or is it a muscle one can build and teach and learn?

Cynthia Pury: Both yes and no. Even in animals, you see evidence of boldness or exploration despite risk. When we moved houses a few years ago, I watched our cats explore. It was clear that they were afraid, but they were still going to check it out. It’s hard for me to think that my cats learned how to do that. You see that in other animal species, too.

The longer I do this, the more I’m convinced that it all comes down to people’s evaluations of the goals and risks of a given situation. So, there are some goals that I would find very easy to be courageous for, like saving someone’s life. Other goals I might not share with others, like my love of doing theater.

Similarly, there are also some risks that we all agree are universal. Fire is dangerous for every human, and we all are susceptible to being burned. I think that’s one of the reasons firefighters are often the least controversial helper people who are seen as heroic and are part of this “monumental courage,” as professor Robin Kowalski and I call it.

Professional team of firefighters spraying high-pressure water at fire.
We are all susceptible to being burned, and perhaps that is why firefighters are universally considered courageous.
Cravetiger/Moment via Getty Images

We also have situations where people have particular fears or vulnerabilities that aren’t necessarily apparent to others. One of the bravest things I’ve ever seen is a former patient of mine wrapping a gift for his child. This person had experienced horrific wartime trauma at Christmastime and had never given his child a Christmas present and he really wanted to. Wrapping the Christmas present brought back all the terrible things that had happened, and in the context of that – and really understanding PTSD – it was quite courageous.

In a day-to-day setting, a lot of the things people report doing that they say are courageous in their everyday life are things that are particular to them or a form of personal courage.

BD: How do you develop courage as an individual?

GC: At Notre Dame I was involved in raising money for Niemann-Pick Type C, a rare disease. The research center reported to me, but I was a physicist, so I couldn’t do genomics and proteomics and those kinds of things, but I wanted to be involved with it. So I decided to ride my bicycle across the country and raise funds for the Ara Parseghian Medical Research Foundation. People would ask me how I got in shape to bike cross-country, and the fact of the matter is I never did. I just had the courage to start and get in shape along the way.

I would tell people today, you’ll take these leadership positions and jobs, and you’ll never be ready because everything changes and comes at you quicker than ever before. You need to have the courage to get in shape along the way, be flexible and have confidence.

At one point, earlier in my career, I was talking about how my hit rate on grants was 20% or 30%. A lay person had asked me if that means I waste 70% of my time. I think my answer today is absolutely not, because I spend 100% of my time developing courage. Sometimes you have to try things over and over again. You keep pushing, and a failure or a misstep often results in a great answer later down the road. So there’s an element of courage when you do fail, but you keep learning, progressing and advancing, and then it comes full circle and you finally get there.

BD: How does failure relate to courage?

CP: Failure is really tied, more than people think it is, to how courageous action is perceived. If you decide to move to the other side of the country to take your dream job, but then the company folds when you get there, you’re not as likely to think that the move was courageous in retrospect.

The Carnegie Medal for heroism, for example, has rewarded people’s acts of physical bravery mostly in instances where the would-be rescuer dies and the would-be victim lives. Not a single time was it rewarded when the would-be rescuer lived and the would-be victim died. And I find that kind of startling.

In my research, people say that a courageous thing they did was something that made a situation better and didn’t make it worse. When they try to do something and fail, people don’t report their action to be courageous. And even people who say that it doesn’t matter if you succeed or fail still end up rating the courageousness of failed things the same way as everybody else does. So that’s definitely something to be aware of and look out for.

Swimmer at the edge of a racing pool with her head bowed.
We tend to view failed actions as less courageous than successful ones.
Oleg Breslavtsev/Moment via Getty Images

BD: What does a courageous conversation actually look like in practice, especially when delivering difficult feedback or talking to people who don’t agree with us?

GC: It’s important to normalize dissent as part of the process. When you can control and manage dissent, you can advance ideas in a much better way. I would say sometimes when you get criticism and so forth, it’s a good thing. Some people would call it a gift that you’re able to have the courage to either push back or to be open to influence and change your mind.

In today’s world, criticism comes nonstop and all the time in these leadership roles. So there’s courage in accepting it and not being defensive about it, and there’s also courage in trying to find a solution and an answer to it, and in some cases acknowledging it and moving forward.

BD: In terms of political courage, when there seems to be a collective consensus about what the right thing to do is, why don’t people act when they want to or others feel like they should?

CP: I wonder how much of what we see with political courage is people having different views about what the right thing is to do in this situation. Is it the right thing to take a stand here? Is this the thing to have your political career die on? Or is it more courageous to just let this go and be there for whatever the next thing is?

I also wonder how much of the courage talk in politics is people signaling, “I value this, I don’t value this.” Having the humility to listen to another side seems to be an important and missing virtue.

The Conversation

Cynthia Pury has received funding from the American Psychological Association and the Department of Defense. She is affiliated with Alchemy Comedy Theater, Greenville, SC.

Gregory Crawford 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. What courage is, how to build it and why you should take a risk – https://theconversation.com/what-courage-is-how-to-build-it-and-why-you-should-take-a-risk-280257

An uncomfortable truth: healthcare is both a protector of health and a contributor to one of its greatest threats

Source: The Conversation – UK – By Lucy Bray, PhD Candidate and Public Health Registrar, University of Southern Denmark

When we think about the causes of climate change, the usual suspects often come to mind: coal-fired power plants, traffic-choked roads, industrial agriculture. Rarely do we picture hospitals.

Yet if global healthcare were a country, it would be one of the world’s top five greenhouse gas emitters. With healthcare responsible for about 5% of total global emissions. This puts it on par with some of the most polluting industries on earth.

The far-reaching consequences of climate change are increasingly recognised as the greatest threat to human health in the 21st century.

Rising temperatures and environmental disruption are already harming on human health. Indeed, this can be seen in the increase in heart and lung disease, the spread of infectious diseases carried by insects, heat-related illness, injuries from extreme weather events and worsening mental health. And then there are issues of disrupted access to clean water, food and shelter.

This reveals an uncomfortable truth: healthcare is both a protector of health and a contributor to one of its greatest threats.

Inside hospital emissions

One of the most surprising aspects of healthcare’s carbon footprint is where most of the emissions come from. While hospitals themselves use large amounts of energy, most emissions – up to 70% – actually arise from the healthcare supply chain itself.

This includes the manufacture, transport and disposal of pharmaceuticals, medical devices, reusable equipment and single-use items such as gloves, masks and syringes.

Modern medicine depends heavily on these products and every item carries its own hidden environmental cost. This means that the carbon footprint of healthcare is not just tied to buildings and electricity use, but to the entire global network required to deliver care.

Hospitals themselves are a major source, accounting for around 30% of healthcare-related emissions in high-income countries. With operating theatres three to six times more energy intensive than other hospital areas.

Individual surgical procedures can also have significant carbon footprints. For example, a heart bypass operation has been estimated to be roughly equivalent to driving 1,700 miles in a petrol car. And even a tonsil removal, a relatively simple operation, is estimated to be like driving 150 miles. When multiplied across the millions of procedures performed worldwide each year, these emissions quickly add up.

Even small, everyday treatments can have surprisingly large environmental impacts. Inhalers, for example, commonly used to treat asthma and other lung conditions, can contain extremely powerful greenhouse gases.

Some of these gases have a global warming potential up to 3,000 times greater than carbon dioxide – a key culprit of climate change. Indeed, inhalers account for over 3% of the total carbon footprint of the National Health Service (NHS) in England alone.

Healthcare emissions are also deeply unequal across the world. Wealthy, technologically advanced countries produce the majority of healthcare related greenhouse gases – with estimates indicating that they account for around 75% of the global total. While poorer countries, which contribute far less to the problem, often face the most severe health consequences of climate change.

Rethinking patient care

But despite the scale of the problem, it is possible to reduce emissions by using different treatments or approaches without compromising patient care.

Where appropriate, this can mean switching patients from high-emission pump inhalers to lower-impact alternatives such as dry powder or capsule-based devices. It could also include doing more procedures as day cases to avoid hospital admissions. Or opting for non-surgical treatment of common conditions instead of operating.

Actually changing clinical practice is, however, a challenge. One of the biggest barriers is that without understanding exactly where emissions occur, it is difficult to identify what changes need to be made and where they’d have the greatest effect.

This is why our team is in the process of measuring the environmental impact of different treatments – from physical training to pain medication, to surgery – to identify the processes responsible for the most emissions.

Although our initial focus will be on a single condition, knee osteoarthritis, our model will eventually be able to be applied more widely across the healthcare system, hopefully allowing real change to occur. This is important because ultimately, hospitals cannot fully protect human health while contributing to the environmental changes that threaten it.


This article was commissioned as part of a partnership between Videnskab.dk and The Conversation, where articles are also published in Danish.

The Conversation

Lucy Bray is affiliated with Læger for Klimaet (Doctors for the Climate).

Søren T. Skou 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. An uncomfortable truth: healthcare is both a protector of health and a contributor to one of its greatest threats – https://theconversation.com/an-uncomfortable-truth-healthcare-is-both-a-protector-of-health-and-a-contributor-to-one-of-its-greatest-threats-269319

How King Charles charmed the US while taking digs at Trump in historic speech to Congress

Source: The Conversation – UK – By Philip Murphy, Director of History & Policy at the Institute of Historical Research and Professor of British and Commonwealth History, School of Advanced Study, University of London

King Charles’s speech to the US Congress – only the second such address by a British monarch – demonstrates how much both the US and the UK have changed in the last three decades.

The first speech was in May 1991 during his mother, Queen Elizabeth II’s, third state visit to the US. The underlying purpose of both speeches was the same: to stress the enduring links between Britain and the US. But the circumstances in which they were delivered were very different.

The late queen’s speech came in the wake of joint action by US and British forces, along with other allies, to eject Saddam Hussein’s Iraqi troops from Kuwait. She referenced this in her speech as a concrete example of the strength of the Anglo-American alliance.

In 2026, the UK has pointedly refused to join the US-Israeli attack on Iran, angering President Donald Trump. Charles’s speech adroitly inverted the moral of this apparent diplomatic rift, suggesting that tensions in the past had always been overcome. Referring to the revolution of 1776 he noted: “Ours is a partnership born out of dispute, but no less strong for it”, because ultimately “our nations are in fact instinctively like-minded”.

A speech like this, voiced by the monarch, can serve at least two useful purposes. The first is to portray things that are, at heart, profoundly political, as being somehow above politics. The second is to place the transitory difficulties of day-to-day diplomacy within the much longer-term perspective of a dynasty that traces its lineage back to the Norman Conquest.

These two elements featured in how both Elizabeth II and Charles’s speeches depicted the Anglo-American alliance. The latter was the basis of a joke by the king, who referred to the actions of the Founding Fathers “250 years ago, or, as we say in the United Kingdom, just the other day”.

Charles’s speech was beautifully crafted and delivered with a degree of warmth and conviction that was always beyond the range of his mother’s public oratory. That, in itself, was almost an implicit reproach to the president’s own rambling, undisciplined public pronouncements.

And in more than one way the address was pitched over the head of Trump. The lack of any immediate pushback from the president suggests that the subtlety of some of the messaging eluded him. But in a more significant sense, it was an appeal to causes that still resonate with much of the American political class if not with the Trump administration itself.

Charles stressed the value of Nato and the importance of “the defence of Ukraine and her most courageous people”. He made a sly reference to his proud association with the Royal Navy – an institution that has been the subject of some disparagement by Trump in recent weeks.

He emphasised the importance of protecting the environment, although couched in a Trumpian language of profit and loss: “We ignore at our peril the fact that these natural systems – in other words, Nature’s own economy – provide the foundation for our prosperity and our national security.”

Perhaps his most pointed remarks – and those that generated the loudest applause from some (although not all) in the hall – were directed at the US itself. He described Congress as “this citadel of democracy created to represent the voice of all American people”. He mentioned the role of Magna Carta in laying the foundation for the constitutional principle that “executive power is subject to checks and balances”. Trump’s opponents clearly enjoyed that.

Saving the special relationship

State visits by British monarchs to the US have been relatively rare, and state visits to London by US presidents are even rarer. Trump is unique in having made two. This in itself is a mark of the desperate attempts by British governments, both Tory and Labour, to find ways of managing relations with his administration. This desperation was also apparent in Keir Starmer’s reckless decision to appoint Peter Mandelson as British ambassador to Washington.

The king’s speech pushed in interesting ways at the boundaries of what a British monarch might be expected to have said in Trump’s America. Yet some of the sentiments in his mother’s 1991 address to Congress – considered uncontroversial at the time – could no longer be expressed without the risk of offending the current administration.

Queen Elizabeth noted: “Some people believe that power grows from the barrel of a gun. So it can, but history shows us that it never grows well nor for very long. Force, in the end, is sterile.”

That may be a lesson Trump will have to learn the hard way. But for the moment, he and his immediate circle seem to have an unwavering belief in the primacy of kinetic force, and have little interest in the objective Charles described of stemming “the beating of ploughshares into swords”.

The queen also commended “the rich ethnic diversity of both our societies”. Charles spoke instead about interfaith understanding. This is not quite the same thing – but is certainly more compatible with the Trump administration’s disturbingly relaxed approach to the rise of white-supremacist politics.

Perhaps the saddest feature of a comparison of the two speeches is the queen’s proud boast in 1991 that “Britain is at the heart of a growing movement towards greater cohesion within Europe, and within the European Community in particular”. If the US has changed since 1991, so has Britain. It would be nice to think that one day the monarch might give an equally generous speech about shared history and values in front of the UK’s European neighbours.

The Conversation

Philip Murphy has received funding from the AHRC. He is a member of the European Movement UK.

ref. How King Charles charmed the US while taking digs at Trump in historic speech to Congress – https://theconversation.com/how-king-charles-charmed-the-us-while-taking-digs-at-trump-in-historic-speech-to-congress-281766

Hoy es el día espejo del eclipse: claves para buscar el mejor lugar desde donde observarlo

Source: The Conversation – (in Spanish) – By Francisco José Torcal Milla, Profesor Titular. Departamento de Física Aplicada. Centro: EINA. Instituto: I3A, Universidad de Zaragoza

No queda prácticamente nada para que podamos disfrutar del eclipse total de Sol del 12 de agosto de 2026, un fenómeno excepcional que ensombrecerá buena parte del noreste de España cerca del ocaso. Muchos aficionados ya están pensando desde qué lugar lo observarán. Si ya han elegido su punto de observación, hoy existe una oportunidad magnífica para comprobar si realmente es adecuado.

El 29 de abril actúa como un día “espejo” del eclipse, ya que el Sol se situará aproximadamente a la misma hora en una posición muy parecida a la que ocupará durante aquel esperado 12 de agosto, comenzando la parcialidad en el intervalo entre las 17:30 y las 19:30 (hora peninsular) y la totalidad cerca de las 20:30, justo antes de la puesta de sol.




Leer más:
El eclipse total que sumergirá España en la sombra un único minuto


El movimiento de los astros

Desde la Antigüedad, la observación del cielo ha permitido comprobar que los astros presentan movimientos periódicos, es decir, repiten posiciones y trayectorias siguiendo intervalos regulares de tiempo. Esta periodicidad se manifiesta en fenómenos tan conocidos como la sucesión del día y la noche, las fases de la Luna, las estaciones del año o la reaparición cíclica de determinados cuerpos celestes.




Leer más:
La gran alineación planetaria que esperábamos ya está aquí


El estudio de estos ciclos fue esencial para el desarrollo de los calendarios, la navegación y, en definitiva, para el nacimiento de la astronomía científica.

En el sistema solar, esta regularidad se debe principalmente a los movimientos de rotación y traslación de sus cuerpos: la Tierra gira sobre su eje cada 24 horas y completa una vuelta alrededor del Sol cada año; la Luna orbita la Tierra aproximadamente cada 28 días; y el resto de los planetas siguen órbitas regulares con periodos que van desde los 88 días de Mercurio hasta los 165 años de Neptuno, hablando siempre en términos terrestres.

Un día “espejo”

Durante los últimos días se ha popularizado en redes sociales y medios de comunicación la expresión día “espejo” del eclipse total de Sol de agosto de 2026. Con ello se hace referencia a una fecha en la que la posición aparente del Sol y su recorrido diario por el cielo son muy similares a los que tendrá el día del eclipse.

Si fuéramos completamente estrictos, habría que matizar que la posición exacta del Sol en un punto del cielo solo se repite de forma precisa al cabo de un año. Sin embargo, dentro del ciclo anual existen fechas que presentan una geometría solar muy parecida y que resultan enormemente útiles para planificar observaciones.

La fecha clave es hoy: 29 de abril

¿Qué tiene de especial el día de hoy? La clave está en que el 29 de abril se encuentra prácticamente a la misma distancia temporal del solsticio de verano que el 12 de agosto de 2026: unos 52 días antes y 52 días después, respectivamente.

Esta disposición casi simétrica dentro del año provoca que la trayectoria aparente del Sol en ambas fechas sea muy semejante. Como consecuencia, la altura del Sol sobre el horizonte, la duración del día y el arco que describe desde el amanecer hasta el atardecer resultan muy parecidos.

Gracias a ello, hoy es una excelente ocasión para comprobar si el lugar que habíamos pensado para ver el eclipse ofrece buenas condiciones: horizonte despejado, ausencia de obstáculos, accesos cómodos o una buena panorámica hacia la zona donde se pondrá el Sol.

¿Y si no puedo ir?

Calma. Si no es posible desplazarse hoy al lugar elegido, tampoco hay problema. Es posible hacerlo mañana o pasado mañana; no será una coincidencia tan precisa, pero seguirá siendo una referencia muy útil para evaluar el emplazamiento.

Además, el Instituto Geográfico Nacional pone a disposición del público su conocido “mapa de sombra”: un visualizador interactivo con información detallada del eclipse, horarios y localizaciones. A través de esta herramienta es posible conocer de forma inmediata la hora de inicio y final del eclipse en cualquier punto concreto, así como la altura del Sol sobre el horizonte en cada fase del fenómeno. Resulta especialmente útil para comparar distintos lugares y decidir cuál puede ofrecer mejores condiciones de observación.

Eso sí, conviene recordar que el visor se basa en modelos de relieve y no contempla obstáculos cercanos como edificios, árboles u otras estructuras que sí podrían afectar a la visibilidad real.

El eclipse total de Sol del 12 de agosto de 2026 será uno de los grandes acontecimientos astronómicos de las próximas décadas en España. Por eso, cualquier oportunidad para preparar con antelación la observación merece la pena. Y hoy, 29 de abril, tenemos una ocasión privilegiada para hacerlo, simplemente mirando al cielo.

The Conversation

Francisco José Torcal Milla no recibe salario, ni ejerce labores de consultoría, ni posee acciones, ni recibe financiación de ninguna compañía u organización que pueda obtener beneficio de este artículo, y ha declarado carecer de vínculos relevantes más allá del cargo académico citado.

ref. Hoy es el día espejo del eclipse: claves para buscar el mejor lugar desde donde observarlo – https://theconversation.com/hoy-es-el-dia-espejo-del-eclipse-claves-para-buscar-el-mejor-lugar-desde-donde-observarlo-281658

Double fonction des séquences d’ADN : une nouvelle étude démontre que certaines sont à la fois codantes et régulatrices

Source: The Conversation – in French – By Benoit Ballester, Chercheur en Bioinformatique à l’Inserm, Unité Inserm 1090 TAGC, Théories et Approches de la Complexité Génomique, Aix-Marseille Université, Marseille., Aix-Marseille Université (AMU)

Pendant longtemps, nous avons appris à lire le génome en séparant deux mondes. D’un côté, les gènes, ces portions d’ADN qui contiennent les instructions pour fabriquer les protéines. À l’intérieur de ces gènes se trouvent les exons, les segments qui servent directement à produire l’ARN puis les protéines. De l’autre côté, l’ADN régulateur, souvent situé dans les régions dites non codantes, qui commande où, quand et à quel niveau les gènes s’expriment. Cette frontière a été très utile. Mais elle est plus poreuse qu’on ne le pensait.

Épissage d’un pré-ARN messager : excision des introns et suture des exons.
Fdardel/Wikimédia, CC BY

Dans l’étude que nous venons de publier dans Nature Communications, nous montrons que des milliers d’exons, parmi les quelque 200 000 que compte le génome humain, ne servent pas seulement à coder des protéines. Une partie d’entre eux agissent aussi comme des régulateurs, c’est-à-dire des séquences capables de stimuler l’expression des gènes. Autrement dit, une même portion d’ADN peut porter deux messages à la fois : l’un pour la protéine, l’autre pour la régulation.

Cette idée existait déjà à travers quelques exemples isolés, mais notre travail en propose pour la première fois une vue systématique, à grande échelle, et dans plusieurs espèces, de l’humain à la souris, en passant par la drosophile et même une plante, Arabidopsis thaliana.

Comment avons-nous répondu à cette question ?

Ce phénomène n’était pas totalement inconnu. Depuis les années 1990, il était décrit dans la littérature scientifique, au fil de cas particuliers ou d’analyses plus larges, sans vraiment qu’on en saisisse l’ampleur.

Pour y répondre, nous avons combiné plusieurs approches à grande échelle, exploitant de très grands volumes de données biologiques issues de travaux antérieurs. Nous avons d’abord analysé plus de 20 000 cartes montrant les endroits du génome où se fixent des facteurs de transcription, ces protéines qui contrôlent l’activité des gènes, afin de repérer les exons qui ressemblent à de véritables régions régulatrices.

Nous avons ensuite cherché d’autres indices montrant que ces exons pouvaient vraiment jouer un rôle régulateur. Nous avons notamment vérifié s’ils se trouvent dans les régions de l’ADN les plus accessibles, condition nécessaire pour que les gènes puissent être activés, et s’ils sont capables d’augmenter l’expression d’un gène dans des tests fonctionnels. Nous avons aussi bloqué certaines de ces séquences dans des cellules afin de voir comment leur absence modifiait l’activité des gènes.

Au final, nous avons identifié plus de 10 000 exons candidats chez l’humain, avec des signatures comparables chez les autres espèces étudiées. Cela montre que cette double fonction n’est pas une exception, mais un phénomène largement répandu dans le vivant.

Pourquoi est-ce important ?

Cette découverte change d’abord notre vision de la régulation des gènes. Les séquences activatrices étaient surtout recherchées dans l’ADN non codant qui correspond à 98 % de notre ADN. Nous montrons qu’une partie de cette régulation est aussi inscrite au cœur même des régions codantes. Les exons ne sont donc pas seulement des segments qui produisent des protéines : certains participent aussi au pilotage de l’expression des gènes, parfois pour leur propre gène, parfois pour d’autres gènes à distance.

L’enjeu est aussi médical. En génétique, on accorde beaucoup d’attention aux mutations qui modifient la protéine. Mais les mutations dites synonymes, souvent qualifiées de silencieuses, sont généralement moins regardées. En effet, le code génétique est lu par groupes de trois lettres, appelés codons, et plusieurs codons différents peuvent correspondre au même acide aminé. Autrement dit, une mutation peut modifier la séquence d’ADN sans changer la protéine produite. Or, si un exon est aussi un régulateur, une mutation synonyme peut malgré tout perturber un signal régulateur sans altérer directement la protéine.

Dans notre étude, nous montrons par des tests fonctionnels que certaines de ces variations modifient bien l’activité régulatrice de l’exon. Dans des données issues de tumeurs, nous observons aussi que des mutations situées dans ces exons sont associées à des changements d’expression de gènes cibles, y compris pour des mutations synonymes.

Quelles suites donner à ce projet ?

Nous n’en sommes probablement qu’au début. Les 10 000 exons identifiés chez l’humain constituent un atlas, mais pas encore une carte complète de tous les contextes biologiques où ces séquences agissent. La suite consiste donc à en tester beaucoup plus, dans davantage de types cellulaires, de tissus et d’espèces, afin de comprendre quand ces régulateurs exoniques sont actifs, quels gènes ils contrôlent et comment ils ont émergé au cours de l’évolution.

Il faudra aussi revoir à grande échelle notre manière d’interpréter les variants situés dans les exons. Jusqu’ici, beaucoup d’analyses demandaient surtout : cette mutation change-t-elle la protéine ? Il faut désormais poser une seconde question : change-t-elle aussi la régulation du gène ? Cette lecture à double entrée pourrait affiner l’interprétation de variants encore mal compris, notamment en cancérologie et en génétique humaine.

The Conversation

Ce travail a été soutenu par le MESR, INSERM, IFB, ANR.

ref. Double fonction des séquences d’ADN : une nouvelle étude démontre que certaines sont à la fois codantes et régulatrices – https://theconversation.com/double-fonction-des-sequences-dadn-une-nouvelle-etude-demontre-que-certaines-sont-a-la-fois-codantes-et-regulatrices-280230