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Seeing what the naked eye can’t − 4 essential reads on how scientists bring the microscopic world into plain sight

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Seeing what the naked eye can’t − 4 essential reads on how scientists bring the microscopic world into plain sight

This microscopy image shows the retina of a mouse, laid flat and made fluorescent.
Kenyoung Kim, Wonkyu Ju and Mark Ellisman/National Center for Microscopy and Imaging Research, University of California, San Diego via Flickr, CC BY-NC

Vivian Lam, The Conversation

The microscope is an iconic symbol of the life sciences – and for good reason. From the discovery of the existence of cells to the structure of DNA, microscopy has been a quintessential tool of the field, unlocking new dimensions of the living world not only for scientists but also for the general public.

For the life sciences, where understanding the function of a living thing often requires interpreting its form, imaging is vital to confirming theories and revealing what is yet unknown.

This selection of stories from The Conversation’s archive presents a few ways in which microscopy has contributed to different forms of scientific knowledge, including techniques that take visualization beyond sight altogether.

1. Seeing as identifying

Over the past few centuries, the microscope has undergone a gradual but significant evolution. Each advance has allowed researchers to see increasingly smaller and more fragile structures and biomolecules at increasingly higher resolution – from cells, to the structures within cells, to the structures within the structures within cells, down to atoms.

But there is still a resolution gap between the smallest and largest structures of the cell. Biophysicist Jeremy Berg drew an analogy to Google Maps: Though scientists could see the city as a whole and individual houses, they couldn’t make out the neighborhoods.

“Seeing these neighborhood-level details is essential to being able to understand how individual components work together in the environment of a cell,” he writes.

Scientists are working to bridge that resolution gap. Improvements to the 2014 Nobel Prize-winning superresolution microscopy, for example, have enhanced the study of lengthy processes like cell division by capturing images across a range of size and time scales simultaneously, bringing clarity to details traditional microscopes tend to blur.

Cryo-ET image of SARS-CoV-2
Cryo-electron tomography shows what molecules look like in high resolution – in this case, the virus that causes COVID-19.
Nanographics, CC BY-SA

Another technique, cryo-electron microscopy, or cryo-EM, won a Nobel Prize in 2017 for bringing even more complex, dynamic molecules into view by flash-freezing them. This creates a protective glasslike shell around samples as they’re bombarded by a beam of electrons to create their photo op. Cryo-ET, a specialized type of cryo-EM, can construct 3D images of molecular structures within their natural environments.

These techniques not only generate images at or near atomic resolution but also preserve the natural shape of difficult-to-capture biomolecules of interest. Researchers were able to use cryo-EM, for instance, to capture the elusive structure of the protein on the surface of the shape-shifting hepatitis C virus, providing key information for a future vaccine.

Further enhancements to science’s visual acuity will reveal more of the fine details of the building blocks of life.

“I anticipate seeing new theories on how we understand cells, moving from disorganized bags of molecules to intricately organized and dynamic systems,” writes Berg.

2. Seeing as scoping

Microscopy images are often framed as snapshots – circumscribed parts of a whole that have been magnified to reveal their hidden features. But nothing in an organism works in isolation. After discerning individual components, scientists are tasked with charting how they interact with each other in the macrosystem of the body. Figuring this out requires not only identifying every component that makes up a particular cell, tissue and organ but also placing them in relation to each other – in other words, making a map.

Researchers have been charting the brain by stitching together multiple snapshots like a photo mosaic. They use different techniques to label a specific cell type and then image the whole brain at high resolution. Layer by layer, each run-through creates an increasingly detailed and more complete model. Neuroscientist Yongsoo Kim likens the process to a satellite image of the brain. Combining millions of these photos allows researchers to zoom into the weeds and zoom out to a bird’s-eye view.

Stiched high-resolution microscopy image of mouse brain.
Zooming in on this image of a mouse brain reveals rectangular lines where images were stitched together, with each colored dot representing a specific brain cell type.
Yongsoo Kim, CC BY-NC-ND

But building a map of a city, however detailed, is not the same as understanding its rhythm and atmosphere. Likewise, knowing where every cell is located relative to each other doesn’t necessarily tell researchers how they function or interact. Just as important as charting out the landscape of an organ is coming up with a working theory of how it all fits together and performs as a whole. Right now, Kim notes, analysis lags behind technical advances in data collection.

“Incredibly rich, high-resolution brain mapping presents a great opportunity for neuroscientists to deeply ponder what this new data says about how the brain works,” Kim writes. “Though there are still many unknowns about the brain, these new tools and techniques could help bring them to light.”

3. Seeing as recognizing

Every improvement in technology brings a parallel improvement in the data it collects, both in quality and in quantity. But that data is only useful insofar as researchers are able to analyze it – high granularity isn’t helpful if those details aren’t appreciable, and high output isn’t beneficial if it’s too overwhelming to organize.

Automated microscopes, for example, have made it possible to take time-lapse images of cells, resulting in massive amounts of data that require manual sifting. Neuroscientist Jeremy Linsley and his team encountered this dilemma in their own work on neurodegenerative disease. They’ve been relying on an army of interns to scour hundreds of thousands of images of neurons and tally each death – a slow and expensive process.

Microscopy images showing rat neurons before and after treatment with glutamate; the neurons are colored green when alive and yellow when dead
These images show living neurons colored green and dead neurons colored yellow.
Jeremy Linsley, CC BY-NC-ND

So they turned to artificial intelligence. Researchers can train an AI model to recognize specific patterns by feeding it many sample images, pointing out structures of interest and extrapolating the algorithm to new contexts. Linsley and his team developed a model to distinguish between living and dead neurons with greater speed and accuracy than people trained to do the same task.

They also opened the black box of the model to figure out how it was finding dead cells, revealing new signals of neuron death that researchers previously weren’t aware of because they weren’t obvious to the human eye.

“By taking out human guesswork, (AI models) increase the reproducibility and speed of research and can help researchers discover new phenomena in images that they would otherwise not have been able to easily recognize,” writes Linsley.

4. Seeing as appreciating

Even before they had the instruments to zoom in on samples, researchers had a tool in their arsenal to study the living world that they still use today: art.

Illustration of cells in a cork from Robert Hooke's Micrographia
This illustration from Robert Hooke’s ‘Micrographia’ shows the structure of cells in a cork.
Robert Hooke/National Library of Wales via Wikimedia Commons

Centuries ago, scientists and artists examined plants, animals and anatomy through illustration. Sketches of unfamiliar species in their natural environments aided in their classification, and drawings of the human body advanced study of its structure and function. With the help of the printing press, these artistic renderings – which later included the view under the lenses of early microscopes – popularized scientific knowledge about the natural world.

Though hand drawings have since given way to advanced imaging techniques and computer models, the legacy of communicating science through art continues. Scientific publications and BioArt competitions highlight laboratory images and videos to share the awe and wonder of studying the natural world with the general public. Using visualizations in classrooms and art museums can also promote science literacy by giving students a chance to look through the eye of the microscope as a scientist would.

Biologist and BioArt Awards judge Chris Curran believes that making visible the processes and concepts of science can grant a greater depth of understanding of the natural world necessary to being an informed citizen.

“That those images and videos are often beautiful is an added benefit,” she writes.

YouTube video
This video of cells migrating in a zebra fish embryo won first place in the 2022 Nikon Small World in Motion Competition.

And the abstract qualities of science can be made tangible in ways that don’t involve sight. Proteins, for instance, can be translated into music by mapping their physical properties into sound: amino acids turn into notes, while structural loops become tempos and motifs. Computational biologists Peng Zhang and Yuzong Chen enhanced the musicality of these mapping techniques by basing them on different music styles, such as that of Chopin. Consequently, a protein that prevents cancer formation, p53, sounds toccata-like, and the protein that binds to the hormone and neurotransmitter oxytocin flutters with recurring motifs.

Framing scientific images as art often requires no more than a change in perspective. And uncovering the poetry of science, many researchers would agree, can help reveal the artistry of life.The Conversation

Vivian Lam, Associate Health and Biomedicine Editor, The Conversation

This article is republished from The Conversation under a Creative Commons license. Read the original article.

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How Nutriset, a French company, has helped alleviate hunger and create jobs in some of the world’s poorest places

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theconversation.com – Nicolas Dahan, Professor of Management, Seton Hall University – 2025-02-25 12:50:00

How Nutriset, a French company, has helped alleviate hunger and create jobs in some of the world’s poorest places

Michel Lescanne, founder and president of the French company Nutriset, holds Plumpy’nut packets in 2005.
Robert Francois/AFP via Getty Images

Nicolas Dahan, Seton Hall University and Bernard Leca, ESSEC

About 19 million children under 5 around the world suffer from severe acute malnutrition every year. This life-threatening condition kills 400,000 of them – that’s one child every 10 seconds.

These numbers are staggering, especially because a lifesaving treatment has existed for nearly three decades: “ready-to-use therapeutic food.”

Nutriset, a French company, was founded by Michel Lescanne. He was one of two scientists who invented this product in 1996. A sticky peanut butter paste branded Plumpy’nut, it’s enriched with vitamins and minerals and comes in packets that require no refrigeration or preparation.

Health care professionals were quickly convinced of its promise. What was harder to figure out was how to manufacture as many packets as possible while cutting costs. In 2008, ready-to-use therapeutic food producers like Nutriset charged US$60 for one box of 150 packets – the number needed to treat one severely malnourished child for the 6-8 weeks needed for their recovery.

In a study we published in the Journal of Management Studies in October 2024, we explained how the international agencies, nongovernmental organizations, activists and for-profit companies involved in the product’s distribution managed to resolve a public controversy over the use of Nutriset’s patent and its for-profit business model.

Contrary to the expectations of activists and many humanitarian NGOs, this for-profit company managed to reduce its prices down to $39 per box of Plumpy’nut packets by 2019 and keep them consistently lower than any nonprofit or for-profit competitors could, all the while enforcing its patent rights.

We interviewed Jan Komrska, a pharmacist then serving as the ready-to-use therapeutic food procurement manager at UNICEF, the United Nations agency for children; Tiddo von Schoen-Angerer, a pediatrician who was leading the access to medicines campaign at Doctors Without Borders, a medical charity; and Thomas Couaillet, a Nutriset executive. We also studied documents issued over the course of a decade to find out why this company’s unusual approach to intellectual property protection was so successful.

Helping franchisees in low-income countries get started

Nutriset and humanitarian organizations disagreed at the start over how to proceed with the production of ready-to-use therapeutic food.

Doctors Without Borders at first accused Nutriset of behaving like a big drugmaker, shielding itself from competition by aggressively enforcing its patents to charge excessively high prices. The nongovernmental organization demanded that Nutriset allow any manufacturer to make its patented packets, without any compensation for that intellectual property.

By 2012, Nutriset had changed course. It had stopped being almost the sole producer of ready-to-use therapeutic food and instead allowed licensees and franchisee partners, chiefly located in low-income countries, to make the packets without having to pay any royalties. It did, however, make an exception for the United States. It allowed Edesia, a Rhode Island-based nonprofit, to become a Nutriset franchisee.

It also provided these smaller producers with seed funding and technical advice.

Nutriset is still the world’s largest ready-to-use therapeutic food producer, we have determined through our research. It’s responsible for about 30% to 40% of the world’s annual production, down from more than 90% in 2008.

There are some other U.S. manufacturers, such as Tabatchnick Fine Foods, but they aren’t Nutriset partners.

YouTube video
Nutriset produced this video in 2012 to explain the scale of hunger around the world and how its ready-to-use therapeutic food packets can help.

Threatening legal action

At the same time, the company continued to threaten to take legal action against potential rivals located in developed countries that were replicating their recipe without authorization. Usually, cease-and-desist letters were sufficient.

Nutriset implemented this strategy to ward off competition from big multinational corporations that might try to establish their brands in new markets, gaining a foothold before flooding them with imported ultraprocessed food. A big risk, had that occurred, would have been less breastfeeding for newborns and the disruption of local diets.

Nutriset’s strategy of opening access to its patent selectively has enabled UNICEF to double the share of packets it buys from producers located in the Global South.

UNICEF, the world’s biggest buyer of ready-to-use therapeutic food, bought less than one-third of its supplies from those nations in 2011. That share climbed to two-thirds in 2022.

Nutriset’s reliance on local franchisees has helped create over 1,000 jobs in hunger-stricken regions while strengthening the supply chain and reducing the carbon emissions of transportation, according to UNICEF.

Nutriset’s creative patent strategy also helped its partner producers in low-income countries, which include nonprofit and for-profit ventures, compete with large corporations in developed countries by the time its patent expired in 2018.

In this instance, a for-profit company not only managed to keep its prices lower than its competitors, including nonprofits, but used its patent to support economic development in developing countries by shielding startup producers from international competition.

As a result of these successes, we found that nongovernmental organizations eventually stopped criticizing the French company and recognized that high prices were actually not due to Nutriset’s patent policy but rather to global prices of the packets’ ingredients.

In recognition of its contributions and innovation, Nutriset won the U.S. Patent and Trademark Office’s Patents for Humanity Award in 2015.

Offering a cheap, convenient and effective treatment

One of the biggest advantages of ready-to-use therapeutic food is that parents or other caregivers can give it to their kids at home or on the go. That’s more convenient and cheaper than the alternative: several months of hospitalization where children receive a nutrient-dense liquid called “therapeutic milk.”

The at-home treatment works most of the time. More than 80% of the children who get three daily food packets recover within two months.

Severe acute malnutrition deaths remain high because historically only 25% to 50% of children suffering from it get treated with ready-to-use therapeutic food, due to insufficient funding. The treatment programs are run by governments, UNICEF and other international agencies, and NGOs such as Doctors Without Borders.

USAID’s funding role

The U.S. government spent about $200 million in 2024 through the U.S. Agency for International Development on ready-to-use therapeutic food, enough packets to treat 3.9 million children. That’s nearly as much as UNICEF, which treats about 5 million children annually.

It’s unclear whether the Trump administration, which is trying to dismantle USAID, will discontinue its funding of ready-to-use therapeutic food that the U.S. government has purchased exclusively from U.S. manufacturers with U.S.-sourced ingredients.

At a time when the flow of development aid from several wealthy countries is declining, the precedent Nutriset set suggests that humanitarian organizations, by teaming up with international agencies, governments and for-profit companies, can help drive down the costs of saving lives threatened by hunger while increasing the nutritional autonomy of the Global South.

But the funding for ready-to-use therapeutic food and its distribution has to come from somewhere, whether it is from governments, foundations or other donors.The Conversation

Nicolas Dahan, Professor of Management, Seton Hall University and Bernard Leca, Professeur en sciences de gestion, ESSEC

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A hazy legal landscape means people can get high on hemp products, even where pot is prohibited

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theconversation.com – Katharine Neill Harris, Fellow in Drug Policy, Rice University – 2025-02-25 07:38:00

A hazy legal landscape means people can get high on hemp products, even where pot is prohibited

Delta-8 supplements on a shelf at a Texas store.
Sergio Flores/Washington Post via Getty Images

Katharine Neill Harris, Rice University

In Texas, where I live, marijuana has long been illegal. Yet on a busy street in my Houston neighborhood, at least five stores within a half-mile of each other sell cannabis products that promise a strong high.

Texas isn’t alone. Due to a mix of recent legal changes and an uncertain policy landscape, residents in roughly half of American states have easy access to impairing hemp products that bear a strong resemblance to marijuana and are far less regulated.

As hemp sales soar – reaching nearly US$3 billion in 2023 – a number of states are tightening their restrictions, while experts are analyzing the public health implications. That’s why I analyzed hemp policies in all 50 states with some of my colleagues at Rice University’s Baker Institute, where I’m a drug policy fellow.

Marijuana and hemp: Same plant, different policies

Marijuana and hemp are both varieties of cannabis sativa, a plant with many uses that produces thousands of compounds. Among them is the popular intoxicant delta-9 tetrahydrocannabinol, or delta-9 THC.

Hemp is widely valued as an industrial crop, and for most of American history, farmers freely cultivated it. But by the mid-20th century, lawmakers had grown increasingly opposed to marijuana and were concerned by hemp’s similarity to its impairment-causing cousin.

In an effort to permit hemp cultivation while prohibiting production of a psychoactive plant, the Agricultural Marketing Act of 1946 defined hemp as all parts of the cannabis plant with less than 0.3 percent concentration of delta-9 THC by dry weight. Cannabis that exceeded this threshold was considered marijuana.

The 1970 Controlled Substances Act ushered in the modern era of prohibition of marijuana and other drugs. Hemp remained technically legal, but because of its similarity to marijuana, it was listed as a Schedule I drug, alongside heroin and other substances deemed to have a high potential for abuse and no medical value.

Because of hemp’s Schedule I status, the Drug Enforcement Administration tightly regulated its production. But hemp farmers have long argued that these regulations were excessive – and in 2018, Congress agreed. That year, lawmakers passed a farm bill that removed hemp from the Controlled Substances Act and legalized the manufacture and sale of hemp and its derivatives.

YouTube video
The ABC News affiliate in San Diego reports on the 2018 farm bill from a local perspective.

Crucially, the 2018 bill still defines hemp as all parts of the plant and its derivatives that have less than 0.3 percent delta-9 THC. But it left a loophole: While delta-9 is the most well-known form of THC, it’s not the only one. Other forms of THC, known as THC isomers, have similar effects. These isomers, like delta-8 and delta-10 THC, can be derived from the hemp plant, and like delta-9 THC, they can cause impairment. The 2018 Farm Bill legalized all of them.

In 2023, sales of hemp-derived cannabinoids reached US$2.8 billion. Market growth has been accompanied by a rise in adverse health events. Chemists have expressed alarm at how some hemp products are made, and analyses of commercially available products have found them to contain heavy metals, residual solvents and pesticides.

Given the lax regulatory environment, many public officials now question the lack of guardrails on this burgeoning hemp industry. As a result, officials and governments across the country are now enacting or considering policy changes.

Some states are imposing age and advertising restrictions

In 2023, 11.4% of 12th graders said they had used hemp-derived delta-8 THC in the past year. Easy access to any substance can encourage use, and THC can have negative impacts on the adolescent brain.

While federal law prohibits the sale of tobacco and alcohol to individuals under 21, there is no similar national requirement for hemp. But at least 27 states that permit the sale of hemp-derived products now have minimum age requirements, and several others have pending legislation.

Lessons from the tobacco market also demonstrate that advertising restrictions can reduce the use of legal but potentially harmful products. Most efforts to curtail hemp advertising focus on youth. Sixteen states restrict the use of packaging and marketing materials that may appeal to minors. Meanwhile, federal regulations also limit youth-targeted marketing.

There are fewer restrictions on advertising to adults. The Food and Drug Administration does prohibit using unverified health claims to sell hemp products, but this standard gives the industry plenty of leeway. Hemp ads often tout their purported physical benefits, like reducing pain or improving sleep, or portray them as mood-boosters that can make one feel euphoric and aroused, with few downsides.

Other states are establishing potency limits

The use of products high in THC has been linked to greater risk of cannabis dependence and adverse mental health outcomes. Concerns about product potency have led all states with recreational marijuana markets to limit the amount of delta-9 THC in edible products. This threshold is typically around 10 milligrams, a dose that’s strong enough to affect most people.

Hemp is a different story. To satisfy federal requirements, hemp just has to have less than 0.3% delta-9 THC by weight. This limit sounds low, but the weight-based metric does not account for heavier products, like food and drinks.

For example, a 50-gram candy bar – roughly the size of a Snickers bar – with 150 milligrams of hemp-derived delta-9 THC is legal in the 34 states that don’t have milligram caps on hemp products. This is a dose 15 times higher than what any recreational marijuana market allows. Meanwhile, states that only restrict hemp’s delta-9 content also leave the door open to products with high amounts of other forms of THC.

At least 13 states have responded to potency concerns by adding milligram caps on the total THC permitted in a single serving of a hemp product. Some of these limits are so low – 1 milligram or less in Connecticut, New York, Montana and Rhode Island – that one serving is unlikely to cause impairment.

Enforcement is a wild card

Only regulations that are enforced are effective, and states differ in the level of energy they devote to industry oversight.

In Virginia, the Office of Hemp Enforcement has issued over $12 million in fines to noncompliant hemp retailers since its creation in 2023. On the other end of the spectrum, Massachusetts considers hemp-derived THC products illegal, but it has not provided local jurisdictions with funding for enforcement, resulting in continued availability of prohibited products.

Some states with legal hemp markets have added additional sales taxes to help fund enforcement. In Nebraska, Missouri and Connecticut, attorneys general have sued hemp retailers for selling illegal items, marketing to minors and engaging in deceptive trade practices.

As the hemp industry expands, so will concerns about how to protect public health. The demand for THC, and the market to supply it, continues to grow. If lawmakers want to develop industrywide safety standards or deal with the challenges of online marketplaces that sell hemp products to minors, it will take action from Washington. In the meantime, many states and policymakers are exploring an expansive middle ground between unfettered access and blanket bans.The Conversation

Katharine Neill Harris, Fellow in Drug Policy, Rice University

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Francis − a pope who has cared deeply for the poor and opened up the Catholic Church

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theconversation.com – Mathew Schmalz, Professor of Religious Studies, College of the Holy Cross – 2025-02-24 15:05:00

Francis − a pope who has cared deeply for the poor and opened up the Catholic Church

Pope Francis during the Palm Sunday Mass at St. Peter’s Square on April 2, 2023, in Vatican City.
Antonio Masiello/Getty Images

Mathew Schmalz, College of the Holy Cross

Pope Francis, who remains in critical condition and hospitalized as he battles pneumonia in both lungs, was elected pope on March 13, 2013, after the surprise resignation of Benedict XVI.

Prior to becoming pope, he was Jorge Mario Bergoglio, archbishop of Buenos Aires, and was the first person from the Americas to be elected to the papacy. He was also the first pope to choose Francis as his name, thus honoring St. Francis of Assisi, a 13th-century mystic whose love for nature and the poor have inspired Catholics and non-Catholics alike.

Pope Francis chose not to wear the elaborate clothing, like red shoes or silk vestments, associated with other popes. As a scholar of global Catholicism, however, I would argue that the changes Francis brought to the papacy were more than skin deep. He opened the church to the outside world in ways none of his predecessors had done before.

Care for the marginalized

Pope Francis reached out personally to the poor. For example, he turned a Vatican plaza into a refuge for the homeless, whom he called “nobles of the street.”

A smiling young man, dressed in black, poses for a photo.
The Argentinian Jorge Mario Bergoglio, ordained for the Jesuits in 1969 at the Theological Faculty of San Miguel.
Jesuit General Curia via Getty Images

He washed the feet of migrants and prisoners during the traditional foot-washing ceremony on the Thursday before Easter. In an unprecedented act for a pope, he also washed the feet of non-Christians.

He encouraged a more welcoming attitude toward gay and lesbian Catholics and invited transgender people to meet with him at the Vatican.

On other contentious issues, Francis reaffirmed official Catholic positions. He labeled homosexual behavior a “sin,” although he also stated that it should not be considered a crime. Francis criticized gender theory for “blurring” differences between men and women.

While he maintained the church’s position that all priests should be male, he made far-reaching changes that opened various leadership roles to women. Francis was the first pope to appoint a woman to head an administrative office at the Vatican. Also for the first time, women were included in the 70-member body that selects bishops and the 15-member council that oversees Vatican finances. Shortly before his death, he appointed an Italian nun, Sister Raffaella Petrini, as President of the Vatican City.

Pope Francis holding on to a railing as he greets people.
Pope Francis in St. Peter’s Square on April 18, 2022.
Stefano Spaziani/Mondadori Portfolio via Getty Images

Not shy of controversy

Some of Francis’ positions led to opposition in some Catholic circles.

One such issue was related to Francis’ embrace of religious diversity. Delivering an address at the Seventh Congress of Leaders of World and Traditional Religions in Kazakhstan in 2022, he said that members of the world’s different religions were “children of the same heaven.”

While in Morocco, he spoke out against conversion as a mission, saying to the Catholic community that they should live “in brotherhood with other faiths.” To some of his critics, however, such statements undermined the unique truth of Christianity.

During his tenure, the pope called for “synodality,” a more democratic approach to decision making. For example, synod meetings in November 2023 included laypeople and women as voting members. But the synod was resisted by some bishops who feared it would lessen the importance of priests as teachers and leaders.

In a significant move that will influence the choosing of his successor, Pope Francis appointed more cardinals from the Global South. But not all Catholic leaders in the Global South followed his lead on doctrine. For example, African bishops publicly criticized Pope Francis’ December 2023 ruling that allowed blessings of individuals in same sex couples.

His most controversial move was limiting the celebration of the Mass in the older form that uses Latin. This reversed a decision made by Benedict XVI that allowed the Latin Mass to be more widely practiced.

Traditionalists argued that the Latin Mass was an important – and beautiful – part of the Catholic tradition. But Francis believed that it had divided Catholics into separate groups who worshiped differently.

This concern for Catholic unity also led him to discipline two American critics of his reforms, Bishop Joseph Strickland of Tyler, Texas, and Cardinal Raymond Burke. Most significantly, Carlo Maria Viganò, the former Vatican ambassador, or nuncio, to the United States was excommunicated during Francis’ tenure for promoting “schism.”

Recently, Pope Francis also criticized the Trump administration’s efforts to deport migrants. In a letter to US Bishops, he recalled that Jesus, Mary and Joseph had been emigrants and refugees in Egypt. Pope Francis also argued that migrants who enter a country illegally should not be treated as criminals because they are in need and have dignity as human beings.

Writings on ‘the common good’

In his official papal letters, called encyclicals, Francis echoed his public actions by emphasizing the “common good,” or the rights and responsibilities necessary for human flourishing.

Several people seated in a row watch as the pope washes the feet of one of them.
Pope Francis washes the foot of a man during the foot-washing ritual at a refugee center outside of Rome on March 24, 2016.
L’Osservatore Romano/Pool Photo via AP

His first encyclical in 2013, Lumen Fidei, or “The Light of Faith,” sets out to show how faith can unite people everywhere.

In his next encyclical, Laudato Si’, or “Praise Be to You,” Francis addressed the environmental crisis, including pollution and climate change. He also called attention to unequal distribution of wealth and called for an “integral ecology” that respects both human beings and the environment.

His third encyclical in 2020, Fratelli Tutti, or “Brothers All,” criticized a “throwaway culture” that discards human beings, especially the poor, the unborn and the elderly. In a significant act for the head of the Catholic Church, Francis concluded by speaking of non-Catholics who have inspired him: Martin Luther King Jr., Desmond Tutu and Mahatma Gandhi.

In his last encyclical, Dilexit Nos, or “He Loved Us,” he reflected on God’s Love through meditating on the symbol of the Sacred Heart that depicts flames of love coming from Jesus’ wounded heart that was pierced during the crucifixion.

Francis also proclaimed a special “year of mercy” in 2015-16. The pope consistently argued for a culture of mercy that reflects the love of Jesus Christ, calling him “the face of God’s mercy.”

A historic papacy

Francis’ papacy has been historic. He embraced the marginalized in ways that no pope had done before. He not only deepened the Catholic Church’s commitment to the poor in its religious life but also expanded who is included in its decision making.

The pope did have his critics who thought he went too far, too fast. And whether his reforms take root depends on his successor. Among many things, Francis will be remembered for how his pontificate represented a shift in power in the Catholic Church away from Western Europe to the Global South, where the majority of Catholics now live.The Conversation

Mathew Schmalz, Professor of Religious Studies, College of the Holy Cross

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