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Source: The Conversation – USA (2) – By Robin Pickering, Professor and Chair, Public Health, Gonzaga University

Public battles over what schools can teach about sex, identity and relationships, often framed around “parental rights,” have become more intense in recent years.

Behind the loud debate lies a quiet contradiction. Many parents who say sex education should be taught only at home don’t actually provide it there, either.

As a scholar of sex education, I found that parents strongly opposed to comprehensive sex education in schools were the least likely to discuss health-promoting concepts such as consent, contraception, gender identity and healthy relationships. I discuss similar themes in my book, “A Modern Approach to the Birds and the Bees.”

Comprehensive sex education delays sexual activity, increases contraceptive use and reduces teen pregnancy and sexually transmitted infection rates. It has a complex history, but has long received bipartisan support.

In recent years, however, old debates over sex education and funding have taken a sharper turn.

In June 2025, the Trump administration ordered California to remove gender-identity materials from sex education lessons or risk losing over US$12 million in federal funding.

This directive is part of a broader shift. Since the early 1980s, abstinence-focused policy has existed at the federal level under Reagan with the Adolescent Family Life Act. In recent years, however, a wave of state-level legislation, often driven by conservative advocacy groups, has tried to limit what schools can teach about sexuality.

The parents’ rights movement

In 2023, Florida expanded its Parental Rights in Education, also known as the “Don’t Say Gay” law, to extend limits on discussing sexual orientation and gender identity to all K–12 grades. The law states that sex can be defined only as strictly binary, limits discussions of gender and sexuality, imposes rules on pronoun use and increases school board authority over curricula.

Other states, including Texas, Oklahoma, Louisiana and Kentucky, have imposed similar restrictions.

Local school boards in states such as Florida, Idaho, Tennessee and Utah have removed textbooks, cut health courses and banned books with LGBTQ+ themes. Conservative, local school boards are reshaping sex education nationwide even though the vast majority of Americans oppose efforts to restrict books in public schools and are confident in public schools’ selection of books.

Who’s having the talk?

As laws limit teaching about sex, gender and identity, I wanted to explore whether parents are stepping in to fill the gaps.

About 10% of the surveyed parents said sex education should happen only at home. Those parents were also most likely to say they “almost never” or “never” discussed sex, sexuality and romance with their children.

By contrast, parents who supported comprehensive, school-based sex ed were significantly more likely to discuss subjects including consent, contraception, identity and healthy relationships at home.

The survey also found that parents who opposed comprehensive sex education were more likely to believe commonly circulated misinformation, such as the idea that talking about sex encourages early sexual activity and that condoms are not effective.

These preliminary findings align with a robust body of peer-reviewed literature suggesting that parents who are more resistant to school-based sex ed are also less likely and less equipped to have open, informed conversations at home.

These findings point to a gap between expert recommendations and what parents do.

At the federal level, the Trump administration slashed funding for comprehensive sex education. The administration also expanded funding for abstinence-only programs, despite evidence of their ineffectiveness.

Risks rise without education

A 2022 report from Common Sense Media found that nearly half of teens report learning about sex online, with pornography among the top sources.

Research indicates that even when schools and families avoid topics related to sexuality, young people still encounter sexual content. Yet, advocacy groups such as Moms for Liberty support the removal of what it considers “age-inappropriate” or “sexually explicit” materials from classrooms and school libraries.

The absence of structured, accurate education likely has implications for public health. According to the CDC, individuals ages 15 to 24 account for nearly half of all new sexually transmitted infections in the U.S.

Mississippi, Alabama and Arkansas have some of the highest teen birth and sexually transmitted infection rates. Yet, these states are also among those with the most restrictive sex education policies and poorest sex ed ratings.

These communities also face higher poverty, limited health care access and lower educational attainment. The combination deepens health disparities.

LGBTQ+ youth are especially vulnerable to sexually transmitted infections and related health challenges. This vulnerability is compounded in regions with limited access to inclusive education.

A 2023 CDC report found that students who receive inclusive sex education feel more connected to school and experience lower rates of depression and bullying. These benefits are especially critical for LGBTQ+ youth.

As debates over sex education continue, I believe it’s important for policymakers, school boards and communities to weigh parental input and public health data.

I am the author of the book, “A Modern Approach to the Birds and the Bees” which I mentioned in the article and do benefit from its sale.

– ref. Parents who oppose sex education in schools often don’t discuss it at home – https://theconversation.com/parents-who-oppose-sex-education-in-schools-often-dont-discuss-it-at-home-258892

Source: The Conversation – USA – By Darryl Z. Seligman, Assistant Professor, Michigan State University

Astronomers manning an asteroid warning system caught a glimpse of a large, bright object zipping through the solar system late on July 1, 2025. The object’s potentially interstellar origins excited scientists across the globe, and the next morning, the European Space Agency confirmed that this object, first named A11pl3Z and then designated 3I/ATLAS, is the third ever found from outside our solar system.

Current measurements estimate that 3I/ATLAS is about 12 miles (20 kilometers) wide, and while its path won’t take it close to Earth, it could hold clues about the nature of a previous interstellar object and about planet formation in solar systems beyond ours.

On July 2 at 3 p.m. EDT, Mary Magnuson, an associate science editor at The Conversation U.S., spoke to Darryl Z. Seligman, an astrophysicist at Michigan State University who has been studying 3I/ATLAS since its discovery.

What makes 3I/ATLAS different from its predecessors?

We have discovered two interstellar objects so far, ’Oumuamua and Comet 2I/Borisov. ’Oumuamua had no dust tail and a significant nongravitational acceleration, which led to a wide variety of hypotheses regarding its origin. 2I/Borisov was very clearly a comet, though it has a somewhat unique composition compared to comets in our solar system.

All of our preparation for the next interstellar object was preparing for something that looked like a ’Oumuamua, or something that looked like Borisov. And this thing doesn’t look like either of them, which is crazy and exciting.

This object is shockingly bright, and it’s very far away from the Earth. It is significantly bigger than both of the interstellar objects we’ve seen – it is orders of magnitude larger than ’Oumuamua.

For some context, ’Oumuamua was discovered when it was very close to the Earth, but this new object is so large and bright that our telescopes can see it, even though it is still much farther away. This means observatories and telescopes will be able to observe it for much longer than we could for the two previous objects.

It’s huge and it’s much farther away, but it is also much faster.

When I went to bed last night, I saw an alert about this object, but nobody knew what was going on yet. I have a few collaborators who figure out the orbits of things in the solar system, and I expected to wake up to them saying something like “yeah, this isn’t actually interstellar.” Because a lot of times you think you may have found something interesting, but as more data comes in, it becomes less interesting.

Then, when I woke up at 1 a.m., my colleagues who are experts on orbits were saying things like “no, this is definitely interstellar. This is for real.”

How can astronomers tell if something is an interstellar object?

The eccentricity of the object’s orbit is how you know that it’s interstellar. The eccentricity refers to how noncircular an orbit is. So an eccentricity of zero is a pure circle, and as the eccentricity increases, it becomes what’s known as an ellipse – a stretched out circle.

And then once you get past an eccentricity of one, you go from an ellipse to a hyperbolic orbit, and that is unbound. So while an elliptical orbit is stretched out, it still orbits and comes back around. An object with a hyperbolic orbit comes through and it leaves, but it never comes back. That type of orbit tells you that it didn’t come from this solar system.

When researchers are collecting data, they’re getting points of light on the sky, and they don’t know how far away they are. It’s not like they see them and can just tell, “oh, that’s eccentric.” What they’re seeing is how far away the object is compared with other stars in the background, what its position is and how fast it’s moving. And then from that data, they try to fit the orbit.

This object is moving fast for how far away it is, and that’s what’s telling us that it could be hyperbolic. If something is moving fast enough, it’ll escape from the solar system. So a hyperbolic, unbound object inherently has to be moving faster.

This is a real-time process. My collaborators have preexisting software, which will, every night, get new observations of all the small bodies and objects in the solar system. It will figure out and update what the orbits are in real time. We’re getting data points, and with more data we can refine which orbit fits the points best.

What can scientists learn from an interstellar object?

Objects like this are pristine, primordial remnants from the planet formation process in other planetary systems. The small bodies in our solar system have taught us quite a lot about how the planets in the solar system formed and evolved. This could be a new window into understanding planet formation throughout the galaxy.

As we’re looking through the incoming data, we’re trying to figure out whether it’s a comet. In the next couple of weeks, there will likely be way more information available to say if it has a cometary tail like Borisov, or if it has an acceleration that’s not due to a gravitational pull, like ’Oumuamua.

If it is a comet, researchers really want to figure out whether it’s icy. If it contains ices, that tells you a ton about it. The chemistry of these small bodies is the most important aspect when it comes to understanding planet formation, because the chemical composition tells you about the conditions the object’s solar system was in when the object formed.

For example, if the object has a lot of ices in it, you would know that wherever it came from, it didn’t spend much time near a star, because those ices would have melted. If it has a lot of ice in it, that could tell you that it formed really far away from a star and then got ejected by something massive, such as a planet the size of Jupiter or Neptune.

Fundamentally, this object could tell astronomers more about a population of objects that we don’t fully understand, or about the conditions in another solar system.

We’ve had a couple of hours to get some preliminary observations. I suspect that practically every telescope is going to be looking at this object for the next couple of nights, so we’ll get much more information about it very soon.

Darryl Z. Seligman is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-2303553. This research award is partially funded by a generous gift of Charles Simonyi to the NSF Division of Astronomical Sciences. The award is made in recognition of significant contributions to Rubin Observatory’s Legacy Survey of Space and Time.

– ref. Astronomers have discovered another puzzling interstellar object − this third one is big, bright and fast – https://theconversation.com/astronomers-have-discovered-another-puzzling-interstellar-object-this-third-one-is-big-bright-and-fast-260391

Source: The Conversation – USA – By Elizabeth Carlen, Living Earth Collaborative Postdoctoral Fellow, Washington University in St. Louis

People often consider evolution to be a process that occurs in nature in the background of human society. But evolution is not separate from human beings. In fact, human cultural practices can influence evolution in wildlife. This influence is highly pronounced in cities, where people drastically alter landscapes to meet their own needs.

Human actions can affect wildlife evolution in a number of ways. If people fragment habitat, separated wildlife populations can evolve to be more and more different from each other. If people change certain local conditions, it can pressure organisms in new ways that mean different genes are favored by natural selection and passed on to offspring – another form of evolution that can be driven by what people do.

In a recent review, evolutionary biologists Marta Szulkin, Colin Garroway and I, in collaboration with scientists spread across five continents, explored how cultural processes – including religion, politics and war – shape urban evolution. We reviewed dozens of empirical studies about urban wildlife around the globe. Our work highlights which human cultural practices have and continue to shape the evolutionary trajectory of wild animals and plants.

Religious practices

If you’ve traveled internationally, you may have noticed the menu at any one McDonald’s restaurant is shaped by the local culture of its location. In the United Arab Emirates, McDonald’s serves an entirely halal menu. Vegetarian items are common and no beef is served in Indian McDonald’s. And in the United States, McDonald’s Filet-O-Fish is especially popular during Lent when observant Catholics don’t consume meat on Fridays.

Similarly, ecosystems of cities are shaped by local cultural practices. Because all wildlife are connected to the environment, cultural practices that alter the landscape shape the evolution of urban organisms.

For example, in Oviedo, Spain, people constructed walls around religious buildings between the 12th and 16th centuries. This division of the city led to different populations of fire salamanders inside and outside the walls. Because salamanders can’t scale these walls, those on opposite sides became isolated from each other and unable to pass genes back and forth. In a process that scientists call genetic drift, over time salamanders on the two sides became genetically distinct − evidence of the two populations evolving independently.

Imagine dumping out a handful of M&Ms. Just by chance, some colors might be overrepresented and others might be missing. In the same way, genes that are overrepresented on one side of the wall can be in low numbers or missing on the other side. That’s genetic drift.

Introducing non-native wildlife is another way people can alter urban ecosystems and evolutionary processes. For example, prayer animal release is a practice that started in the fifth or sixth century in some sects of Buddhism. Practitioners who strive to cause no harm to any living creature release captive animals, which benefits the animal and is meant to improve the karma of the person who released it.

However, these animals are often captured from the wild or come from the pet trade, thereby introducing non-native wildlife into the urban ecosystem. Non-natives may compete with local species and contribute to the local extinction of native wildlife. Capturing animals nearby has downsides, too. It can diminish local populations, since many die traveling to the release ceremony. The genetic diversity of these local populations in turn decreases, reducing the population’s ability to survive.

Influence of politics

Politically motivated campaigns have shaped wildlife in various ways.

Starting in 1958, for instance, the Chinese Communist Party led a movement to eliminate four species that were considered pests: rats, flies, mosquitoes and sparrows. While the first three are commonly considered pests around the world, sparrows made the list because they were “public animals of capitalism” due to their fondness for grain. The extermination campaign ended up decimating the sparrow population and damaging the entire ecosystem. With sparrows no longer hunting and eating insects, crop pests such as locusts thrived, leading to crop destruction and famine.

In the United States, racial politics may be shaping evolutionary processes in wildlife.
For instance, American highways traverse cities according to political agendas and have often dismantled poor neighborhoods of color to make way for multilane thoroughfares. These highways can change how animals are able to disperse and commingle. For example, they prevent bobcats and coyotes from traveling throughout Los Angeles, leading to similar patterns of population differentiation as seen in fire salamanders in Spain.

Wildlife during and after war

Human religious and political agendas often lead to armed conflict. Wars are known to dramatically alter the environment, as seen in current conflicts in Gaza and Ukraine.

While documenting evolutionary changes to urban wildlife is secondary to keeping people safe during wartime, a handful of studies on wildlife have come out of active war zones. For example, the current Russia-Ukraine war affected the migration of greater spotted eagles. They made large diversions around the active war zone, arriving later than usual at their breeding grounds. The longer route increased the energy the eagles used during migration and likely influenced their fitness during breeding.

Wars limit access to resources for people living in active war zones. The lack of energy to heat homes in Ukraine during the winter has led urban residents to harvest wood from nearby forests. This harvesting will have long-term consequences on forest dynamics, likely altering future evolutionary potential.

A similar example is famine that occurred during the Democratic Republic of Congo’s civil wars (1996-1997, 1998-2003) and led to an increase in bushmeat consumption. This wildlife hunting is known to reduce primate population sizes, making them more susceptible to local extinction.

Even after war, landscapes experience consequences.

For example, the demilitarized zone between North Korea and South Korea is a 160-mile (250-kilometer) barrier, established in 1953, separating the two countries. Heavily fortified with razor wire and landmines, the demilitarized zone has become a de facto nature sanctuary supporting thousands of species, including dozens of endangered species.

The collapse of the Soviet Union and the end of the Cold War led to the establishment of the European Green Belt, which runs along the same path as the Iron Curtain. This protected ecological network is over 7,800 miles (12,500 kilometers) long, allowing wildlife to move freely across 24 countries in Europe. Like the Korean DMZ, the European Green Belt allows for wildlife to move, breed and exchange genes, despite political boundaries. Politics has removed human influence from these spaces, allowing them to be a safe haven for wildlife.

While researchers have documented a number of examples of wildlife evolving in response to human history and cultural practices, there’s plenty more to uncover. Cultures differ around the world, meaning each city has its own set of variables that shape the evolutionary processes of wildlife. Understanding how these human cultural practices shape evolutionary patterns will allow people to better design cities that support both humans and the wildlife that call these places home.

Ideas for this article were developed as part of a NSF funded Research Coordination Network (DEB 1840663). Elizabeth Carlen was funded by the Living Earth Collaborative.

– ref. War, politics and religion shape wildlife evolution in cities – https://theconversation.com/war-politics-and-religion-shape-wildlife-evolution-in-cities-260184

Source: The Conversation – USA – By Peter Mullner, Distinguished Professor in Materials Science and Engineering, Boise State University

Many modern devices – from cellphones and computers to electric vehicles and wind turbines – rely on strong magnets made from a type of minerals called rare earths. As the systems and infrastructure used in daily life have turned digital and the United States has moved toward renewable energy, accessing these minerals has become critical – and the markets for these elements have grown rapidly.

Modern society now uses rare earth magnets in everything from national defense, where magnet-based systems are integral to missile guidance and aircraft, to the clean energy transition, which depends on wind turbines and electric vehicles.

The rapid growth of the rare earth metal trade and its effects on society isn’t the only case study of its kind. Throughout history, materials have quietly shaped the trajectory of human civilization. They form the tools people use, the buildings they inhabit, the devices that mediate their relationships and the systems that structure economies. Newly discovered materials can set off ripple effects that shape industries, shift geopolitical balances and transform people’s daily habits.

Materials science is the study of the atomic structure, properties, processing and performance of materials. In many ways, materials science is a discipline of immense social consequence.

As a materials scientist, I’m interested in what can happen when new materials become available. Glass, steel and rare earth magnets are all examples of how innovation in materials science has driven technological change and, as a result, shaped global economies, politics and the environment.

Glass lenses and the scientific revolution

In the early 13th century, after the sacking of Constantinople, some excellent Byzantine glassmakers left their homes to settle in Venice – at the time a powerful economic and political center. The local nobility welcomed the glassmakers’ beautiful wares. However, to prevent the glass furnaces from causing fires, the nobles exiled the glassmakers – under penalty of death – to the island of Murano.

Murano became a center for glass craftsmanship. In the 15th century, the glassmaker Angelo Barovier experimented with adding the ash from burned plants, which contained a chemical substance called potash, to the glass.

The potash reduced the melting temperature and made liquid glass more fluid. It also eliminated bubbles in the glass and improved optical clarity. This transparent glass was later used in magnifying lenses and spectacles.

Johannes Gutenberg’s printing press, completed in 1455, made reading more accessible to people across Europe. With it came a need for reading glasses, which grew popular among scholars, merchants and clergy – enough that spectacle-making became an established profession.

By the early 17th century, glass lenses evolved into compound optical devices. Galileo Galilei pointed a telescope toward celestial bodies, while Antonie van Leeuwenhoek discovered microbial life with a microscope.

Lens-based instruments have been transformative. Telescopes have redefined long-standing cosmological views. Microscopes have opened entirely new fields in biology and medicine.

These changes marked the dawn of empirical science, where observation and measurement drove the creation of knowledge. Today, the James Webb Space Telescope and the Vera C. Rubin Observatory continue those early telescopes’ legacies of knowledge creation.

Steel and empires

In the late 18th and 19th centuries, the Industrial Revolution created demand for stronger, more reliable materials for machines, railroads, ships and infrastructure. The material that emerged was steel, which is strong, durable and cheap. Steel is a mixture of mostly iron, with small amounts of carbon and other elements added.

Countries with large-scale steel manufacturing once had outsized economic and political power and influence over geopolitical decisions. For example, the British Parliament intended to prevent the colonies from exporting finished steel with the iron act of 1750. They wanted the colonies’ raw iron as supply for their steel industry in England.

Benjamin Huntsman invented a smelting process using 3-foot tall ceramic vessels, called crucibles, in 18th-century Sheffield. Huntsman’s crucible process produced higher-quality steel for tools and weapons.

One hundred years later, Henry Bessemer developed the oxygen-blowing steelmaking process, which drastically increased production speed and lowered costs. In the United States, figures such as Andrew Carnegie created a vast industry based on Bessemer’s process.

The widespread availability of steel transformed how societies built, traveled and defended themselves. Skyscrapers and transit systems made of steel allowed cities to grow, steel-built battleships and tanks empowered militaries, and cars containing steel became staples in consumer life.

Control over steel resources and infrastructure made steel a foundation of national power. China’s 21st-century rise to steel dominance is a continuation of this pattern. From 1995 to 2015, China’s contribution to the world steel production increased from about 10% to more than 50%. The White House responded in 2018 with massive tariffs on Chinese steel.

Rare earth metals and global trade

Early in the 21st century, the advance of digital technologies and the transition to an economy based on renewable energies created a demand for rare earth elements.

Rare earth elements are 17 chemically very similar elements, including neodymium, dysprosium, samarium and others. They occur in nature in bundles and are the ingredients that make magnets super strong and useful. They are necessary for highly efficient electric motors, wind turbines and electronic devices.

Because of their chemical similarity, separating and purifying rare earth elements involves complex and expensive processes.

China controls the majority of global rare earth processing capacity. Political tensions between countries, especially around trade tariffs and strategic competition, can risk shortages or disruptions in the supply chain.

The rare earth metals case illustrates how a single category of materials can shape trade policy, industrial planning and even diplomatic alliances.

Technological transformation begins with societal pressure. New materials create opportunities for scientific and engineering breakthroughs. Once a material proves useful, it quickly becomes woven into the fabric of daily life and broader systems. With each innovation, the material world subtly reorganizes the social world — redefining what is possible, desirable and normal.

Understanding how societies respond to new innovations in materials science can help today’s engineers and scientists solve crises in sustainability and security. Every technical decision is, in some ways, a cultural one, and every material has a story that extends far beyond its molecular structure.

The National Science Foundation, the Department of Energy, NASA, and other national and regional agencies have funded former research of Peter Mullner.

– ref. From glass and steel to rare earth metals, new materials have changed society throughout history – https://theconversation.com/from-glass-and-steel-to-rare-earth-metals-new-materials-have-changed-society-throughout-history-258244