The year 2020 has been no stranger to suffering. In the midst of a global pandemic, widespread financial hardship and violence arising from systemic racism, empathy for others’ suffering has been pushed to the front and center in U.S. society.

As society grapples to find its moral compass in a time of such hardship and strife, a critical question emerges: Whose suffering should one care about?

When you ponder who is worth feeling empathy for, friends, family members and children might come to mind. But what about strangers, or people not connected to you through nationality, social status or race?

As cognitive scientists, we wanted to understand what moral beliefs people hold about empathy and how these beliefs may shift depending on whom someone is feeling empathy for.

Empathy as a force for good

Evidence suggests that empathy – broadly defined as the ability to understand and share in someone else’s experience – can be a force for good. Numerous studies have shown it often leads to altruistic helping behavior. Further, feeling empathy for a member of a stigmatized group can reduce prejudice and improve attitudes toward the entire stigmatized group.


But there has also been research suggesting empathy may contribute to bias and injustice. Studies have shown that people tend to feel more empathy for the suffering of those who are close and similar to themselves, such as someone of the same race or nationality, than for those who are more distant or dissimilar. This bias in empathy has consequences. For example, people are less likely to donate time or money to help someone of a different nationality compared with someone of their own nationality.

Neuroscientists have shown that this bias is evident in how our brains process both firsthand and secondhand pain. In one such study, participants received a painful shock and also watched another person receive a painful shock. There was greater similarity in participants’ neural activity when the person they observed rooted for the same sports team as themselves.

Whether empathy has a positive impact on society or not has been the subject of a fierce debate spanning politics, philosophy and psychology. Some scholars have suggested empathy should be denounced as too narrow in scope and inherently biased to have a place in our moral lives.

Others have argued that empathy is a particularly potent force that can motivate many people to help others and can be expanded to be more inclusive.

What is largely left unconsidered is whether it could actually be our sense of what is right and wrong that limits our empathy. Perhaps many of us believe that inequality in empathy is right – that we should care more for those who are close and similar to us. In other words, loyalty is a greater moral force than equality.

The morality of empathy

In 2020, we ran a study to better understand the morality of empathy.

Three hundred participants from across the U.S. completed a study in which they were presented with a story describing an individual who is learning about global food scarcity. The individual reads about the struggles of two people in the story, one who is socially close – a friend or a family member – and another who is socially distant: for example, from a distant country. In different versions, the person in the story is described as feeling empathy for the stranger or for the friend or family member, or for both people equally, or for neither.

After reading the story, participants then rated how morally right or wrong they thought it was for this person to feel empathy in this manner.

When presented with stories in which the person feels either empathy solely for the friend/family member or the socially distant person, participants typically respond that it is more moral to feel empathy for the friend/family member. But participants judged feeling equal empathy as the most moral. Equal empathy was rated as 32% more morally right than feeling empathy for just one person in the story.

Friend or stranger?

Although this study suggested that people believed it more moral to have equal empathy, it left certain questions unanswered: What was behind the perceived morality of equal empathy? And would this pattern hold if people were judging their own feelings on empathy?

So we ran a follow-up study with a new sample of 300 people. This time we changed the story so that it was from the participants’ own perspective, and the two people in need were people they personally knew – one being someone close to them, the other an acquaintance. We also added endings to the story, so that participants could now also feel empathy for both people but to different degrees.

The results were remarkably similar to the first study: Feeling more empathy for one’s close friend or family member was seen as more moral. But most notably, feeling equal empathy for both people was again judged as the most moral outcome.

Where to go from here?

In a moment when fostering a culture of caring for those who are different seems challenging, our research may offer some insight and perhaps hope. It suggests that most people believe we should care about everyone equally.

With the right approach, this belief in the morality of equal empathy may even translate to real changes. Recent work has shown that empathy can be increased based on one’s motivation and personal beliefs. For example, participants who wrote a letter about how empathy can be grown and developed showed improvements in their ability to recognize others’ emotions, a major part of empathy.

We are undoubtedly living through an age in which people are divided by race, nationality and political affiliation. But we are all human beings, and we all deserve to be cared for on some level. Our research provides evidence that this principle of equality in empathy is not some obscure ideal. Rather, it is a tenet of our moral beliefs.

This article first appeared on The Conversation. You can read it here.

  • Can’t stop endlessly scrolling? Tips to help you take back control
    Photo credit: milorad kravic/Getty Images
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    Can’t stop endlessly scrolling? Tips to help you take back control

    Social media is designed to be addictive, but there are ways to break free.

    It’s called the infinite scroll – a design feature on social media, shopping, video and many other apps that continuously loads content as you reach the bottom of the page. Handy? Yes. Clever? Also yes. Devious? Very much so. The infinite scroll is likely the main reason you find it so hard to stop scrolling once you begin.

    To understand why this design feature is so devious, we need to understand the psychology and behaviours it taps into.

    First, the infinite scroll takes away a natural stopping point – where you might decide that’s enough social media for today. For example, Instagram feeds once stopped after all chronologically new posts from followed accounts had been viewed, and even told us we were “all caught up” for the day. Now, algorithmic feeds combined with the infinite scroll mean there’s no way to ever be caught up with it all.

    The second reason you find it so hard to stop scrolling is the promise of something good that might be just about to pop up in your feed. The algorithm “knows” what you like. So, hand-in-hand with the infinite scroll, it keeps feeding you all those tasty tid-bits.

    Putting it bluntly, these features help create an addiction of sorts. The promise of a little hit of dopamine when we see content we love. And addictions are hard to beat – but not impossible.

    Here are some quick wins and longer-term solutions if you want to break free from the grip of the scroll.

    The quick wins

    Create a break

    Your device might be the problem, but it can also be part of the solution. Start by using your phone’s screen time features – such as Android’s Digital Wellbeing or Apple’s Screen Time.

    You can also install a more sophisticated third-party app that forces you to break the patterns of mindless scrolling behaviour.

    Apps such as One SecScreenZenOpal and Freedom can short-circuit the automatic habits associated with scrolling in various ways. These include putting mandatory pauses before social media apps open, or applying colour filters (like grayscale) to make apps less appealing.

    They can even hard-block apps for specific periods of time if you really need a tough love approach.

    Remove social media apps

    This one’s usually met with an audible gasp when I suggest it, but you might find you adapt to not having social media at your fingertips faster than you’d imagine. You’re not deleting your accounts – just making it harder to open them and scroll.

    Schedule some scrolling time

    If you can’t imagine life without scrolling, schedule time each day for just that activity. It could be in your lunch break or when you get home from work: give yourself the freedom to scroll for the amount of time you set (say, 15 minutes) and don’t feel guilty about it. Just remember you still have to close the apps and get on with your life as soon as the time is up.

    The hard work

    The above might limit your scrolling in the short term, but long-term benefits (and emotional freedom) will likely take a bit more work.

    The “easy” tips often work for a little while, when you’re motivated to change and feeling optimistic. But time and the pressures of life can start to erode your convictions.

    So, to gain true freedom from scrolling, think about social media and whether it’s a relationship that serves you well. If you feel like it’s controlling you far more than you are controlling it, here are some things to consider. Be warned, they might not be easy.

    What’s the deeper reason?

    Think deeply about why you’re scrolling so much in the first place. Is it a lack of willpower? Are you avoiding something or someone? Are you suppressing feelings that you would prefer not to acknowledge?

    All of these things can be reasons why we seek distraction. You might be avoiding a big thing (the state of a relationship) or a small thing (cooking dinner), but either way, scrolling is the symptom, not the disease. So, consider if scrolling might be part of a bigger problem you need to deal with instead.

    Who’s benefiting whom?

    Consider how much you really “need” social media. Do you actively use it in a way that benefits you (for example, as a business platform) or did you sign up out of curiosity years ago and have never really questioned why you’re still using it?

    If it’s the latter, apply a critical lens to the platforms you use and how they serve you. On average, Australians use six to seven different social media platforms regularly. Think about what you might gain from spending less time scrolling, but also think about whether your life would be worse without some of them.

    If you can’t think of a really compelling reason as to why it would be worse, it might be time to say goodbye to a few.

    These “hard” options will take time and effort, and require you to reflect on your habits. But, like with most things, the reward for effort is likely to be greater, and last longer.

    This article originally appeared on The Conversation. You can read it here.

  • Goodbye, knee pain. In a medical first, scientists have found a way to regrow damaged cartilage.
    (LEFT) Person with knee pain and (RIGHT) new bioactive material.Photo credit: Canva & Samuel I. Stupp/Northwestern University
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    Goodbye, knee pain. In a medical first, scientists have found a way to regrow damaged cartilage.

    “Our new therapy can induce repair in a tissue that does not naturally regenerate.”

    Science might be closer than ever to solving your aching knee problems. Researchers at Northwestern University have created a rubbery goo that can regrow cartilage in damaged knees.

    Cartilage cushions joints, keeps movement smooth and pain-free, and reduces pressure on bones—from standing still to a vigorous hike. However, when it’s damaged by injury or simple wear and tear, the road to recovery can be extremely challenging. Cartilage has a very limited ability to regrow and heal itself.

    research, regrow cartilage, recovery, tissue, regeneration
    A doctor examines a knee.
    Photo credit: Canva

    Regrowing cartilage with a rubbery goo

    This breakthrough bioactive material doesn’t just passively sit in the body, it binds to and integrates with surrounding tissue, promoting cartilage regeneration. The substance forms a network of components that imitate the body’s natural environment. A scaffold-like structure allows cells to connect and rebuild cartilage tissue.

    “The problem is that, in adult humans, cartilage does not have an inherent ability to heal,” said Samuel I. Stupp, who led the study. “Our new therapy can induce repair in a tissue that does not naturally regenerate. We think our treatment could help address a serious, unmet clinical need.”

    protein, sheep, bioactive material, damaged tissue, protein fragments
    Damaged cartilage stained red.
    Photo credit: Samuel I. Stupp/Northwestern University

    Bioactive material regenerates high-quality cartilage

    In the study, Stupp and his team applied the material to damaged cartilage in sheep. These animals have weight-bearing loads comparable to human knees.

    The biomaterial, made from short protein fragments and a modified version of hyaluronic acid, behaves similarly to naturally occurring cartilage in the body. Stupp explained the reasoning behind using hyaluronic acid, saying, “It’s also naturally found in many tissues throughout the human body, including the joints and brain. We chose it because it resembles the natural polymers found in cartilage.”

    After fewer than six months, the new cartilage showed high-quality regeneration and strong indications that the repair could work in humans.

    hyaluronic acid, cartilage repair, natural polymers, structure, surgery, regrow cartilage
    Treated cartilage stained red shows repair.
    Photo credit: Samuel I. Stupp/Northwestern University

    Limited solutions to damaged knees

    Cartilage damage is unfortunately very common, affecting more than 500 million people worldwide. For decades, the message has been discouraging: once cartilage is damaged or disappears, it’s gone for good.

    A 2025 study found that current treatments, such as surgery, cell implants, and microfracture, may help in the short term but often produce weaker cartilage soon after. Failure rates for microfracture surgery have led to as many as 41% of patients requiring total knee replacement. Finding reliable, long-lasting solutions is still a work in progress.

    A 2025 study on cartilage repair found that, although many people felt better after surgery, up to 48% developed arthritis over time. Only 17–20% returned to playing sports, and some required additional surgeries, including knee replacement.

    yoga, exercise, standard care, arthritis, goo-like material,
    A woman practices yoga.
    Photo credit: Canva

    Study hopes to change the standard of care

    Researchers believe the bioactive material could be used in most joint surgeries. With these promising findings, the goo-like substance could one day make a meaningful difference for anyone hoping to move without pain again.

    “By regenerating hyaline cartilage, our approach should be more resistant to wear and tear, fixing the problem of poor mobility and joint pain for the long term while also avoiding the need for joint reconstruction with large pieces of hardware,” Stupp said.

  • Menstrual pads and tampons can contain toxic substances – here’s what to know about this emerging health issue
    Studies have found small amounts of toxic heavy metals and other potentially harmful substances in some menstrual pads and tampons.Photo credit: zoranm/E+ via Getty Images

    About half of the global population menstruates at some point in their lives. Disposable products, such as tampons and pads, are some of the most popular products used around the globe to manage menstrual flow.

    Unfortunately, studies have shown that many personal care products, including shampoo, lotion, nail polish and menstrual products, contain hazardous chemicals. Items used in or near the vagina are of particular concern because they are in contact with vaginal mucous membranes – the moist tissue lining the inside of the vagina that secretes mucus. These tissues can absorb some chemicals very efficiently.

    People use menstrual products 24 hours a day for multiple days monthly, over the course of many years. Tampons, which are used internally, are surrounded by the permeable vaginal mucous membrane for up to eight hours at a time.

    I am an environmental epidemiologist, and I study chemical exposure, its sources and its health effects. As a person who menstruates, I also must make my own decisions around menstrual products and manage the challenge of finding accurate information about women’s health risks, which receive less research attention and funding than men’s health.

    In 2024, I co-authored the first paper that detected metals in tampons, including toxic metals like lead and arsenic. My colleagues and I also wrote a review paper that surveyed the scientific literature and found about two dozen studies measuring chemicals in menstrual products.

    The various chemicals that these studies detected were typically at concentrations low enough to make their health impact unclear. However, they included chemicals known to disrupt the endocrine system, which makes and controls hormones that are essential for bodies to function.

    How contaminants get into menstrual products

    The first modern tampon in the U.S. was patented in 1931. Nearly a century later, tampons still are made primarily from cotton, rayon or a blend of the two.

    Chemicals may get into tampons and other menstrual products in a number of ways. Some chemicals, like heavy metals, are present in soil, either naturally or due to pollution, and may be absorbed by cotton plants.

    Other chemicals, such as zinc, may be intentionally added to menstrual products to prevent the growth of harmful bacteria. Still others, such as phthalates – synthetic chemicals used to manufacture plastics – may leach into menstrual products from plastic packaging or be added as part of a fragrance.

    Research suggests that these chemicals are present in a large proportion of menstrual products – we found lead present in all 30 tampons we tested. What we don’t yet know is if these chemicals can get into people’s bodies in a high enough concentration to cause health effects in either the reproductive system or elsewhere in the body.

    Limited federal regulations

    The U.S. Food and Drug Administration regulates tampons, menstrual cups and scented menstrual pads as Class II medical devices, which carry moderate to medium risk. Unscented menstrual pads are Class I medical devices, which are considered low-risk. These categories are based on the risk the device may present to a consumer who uses it in the intended way.

    FDA guidance for Class II devices offers only a few general guidelines with respect to chemicals. For menstrual tampons and pads, it recommends – but does not require – that products should not contain two specific dioxin products or “any pesticide and herbicide residues.” Dioxins are a chemical by-product of the bleaching process to whiten cotton, and they are associated with cancer and endocrine disruption. Using non-chlorine bleaching methods can reduce dioxin formation.

    The most stringent regulation of tampons in the U.S. occurred after an illness called toxic shock syndrome became a public concern in the 1970s and 1980s. Menstrual toxic shock syndrome occurs when the bacteria Staphlococcus aureus grows in the vagina on inserted menstrual products and releases a toxin called TSST-1. This substance can be absorbed through the vaginal mucosa and cause a variety of symptoms, including fever, high blood pressure, shock and even death.

    During this epidemic, in which at least 52 cases were recorded and seven people died over a period of eight months, tampons were associated with the syndrome – especially a highly absorbent tampon called Rely, which was pulled from the market.

    In response, the FDA created a task force that recommended standardizing the tampon absorbencies and advised consumers to use the lowest absorbency for their flow. This is why tampons in the U.S. now come in a range of absorbencies, from light through regular to super and ultra, so that users can choose the level they need while minimizing risk of toxic shock.

    Living in a ‘soup of chemicals’

    Just because a chemical is present in a menstrual product doesn’t mean it can get into the body. However, chemicals like lead and arsenic are known threats to human health. So it’s important to study whether harmful chemicals present in menstrual products could contribute to health problems.

    Humans in the modern world live in what expert toxicologist Linda Birnbaum, former director of the National Institute of Environmental Health Sciences, calls a “soup of chemicals.” Simply being present on Earth means being exposed to many chemicals, at different concentrations, all at once. This makes it difficult to unravel the relationship between a single chemical exposure and health.

    Nonetheless, science has shown that chemical exposure from at least one menstrual product – vaginal douches – does affect health. Vaginal douching is the process of washing or cleaning the inside of the vagina with water or other fluids.

    The American College of Obstetricians and Gynecologists recommends avoiding this process, which can harm healthy bacteria in the vagina, increasing the risk of vaginal infections and other diseases.

    In addition, a 2015 study found that women who use vaginal douches have higher concentrations of a chemical called monoethyl phthalate in their urine. Exposure to this substance is associated with reproductive health problems, such as reduced fertility and increased pregnancy risk.

    Can these chemicals be absorbed?

    Scientists are working now to determine what concentrations of metals and other chemicals can leach out of tampons and other menstrual products. One 2025 study estimated that volatile organic compounds, a group of chemicals that vaporize quickly, can be absorbed through the vaginal mucosa. Volatile organic compounds may be added to menstrual products as part of fragrances, adhesives or other product components.

    My team and I are now shifting our focus to the relationship between menstrual product use, various chemicals, and menstrual pain and bleeding severity. We want to see whether some chemicals will be elevated in menstrual blood, whether these chemical levels are higher in people who use tampons, and whether the chemicals are associated with greater menstrual pain and bleeding.

    States are starting to act on this issue. For example, in 2024, Vermont became the first U.S. state to ban multiple chemicals from disposable menstrual products. California bans PFAS, a widely used group of highly persistent chemicalsfrom menstrual products. New York adopted a law in December 2025 barring multiple toxic chemicals from menstrual products.

    California also enacted a law in October 2025 that requires manufacturers of disposable tampons and pads to measure concentrations of arsenic, cadmium, lead and zinc in their products, and to share those measurements with the state, which can publish them. More information like this will help support informed choices for millions of consumers who rely on menstrual products every month.

    This article originally appeared on The Conversation. You can read it here.

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