News Feeds

Stars don't exist in isolation. They have siblings and exist in clusters, associations, and groups. The ESA's Gaia mission found an unusual group of stars rapidly leaving its birthplace behind and dispersing into the wider galaxy. While that's not necessarily unusual behaviour, it is for such a large group. Could supernovae explosions be responsible?

Are things getting better?
For whom? What does “better” mean?

The economic and social phenomena so clear in everyday experience are invisible in the standard national accounts and GDP (Gross Domestic Product) statistics. The current concept of value added used to construct GDP numbers does not correspond to the views many people hold about societal value. This disconnect has given momentum to the Beyond GDP movement and to those similarly challenging the metrics of shareholder value that determine how businesses act. The digitalization of the economy, in shifting the ways economic value can be created, amplifies the case for revisiting existing economic statistics.

Without good statistics, states cannot function. In my work focusing on both the digital economy and the natural economy, I have worked closely with official statisticians in the ONS (Office for National Statistics), BEA (Bureau of Economic Analysis), OECD (Organization for Economic Cooperation and Development), INSEE (National Institute of Statistics and Economic Studies), and elsewhere for many years. Without question there has been a widespread loss of belief in conventional statistics even among knowledgeable commentators, as the vigorous Beyond GDP agenda testifies.

Why Not Well-Being?

An alternative metric of social welfare that many people find appealing is the direct measurement of well-being. Economists who focus on well-being have differing views on exactly how to measure it, but the balance of opinion has tilted toward life satisfaction measured on a fixed scale. One such measurement is the Cantril Ladder, which asks respondents to think of a ladder, with the best possible life for them being a 10 and the worst possible life being a 0, and are then asked to rate their own current lives on that 0 to 10 scale.

Although people’s well-being is the ultimate aim of collective action, using it as a measurement is problematic in several ways. One is the set of measurement issues highlighted in research by Mark Fabian. These include scale norming, whereby when people state their life satisfaction as, say, a 7 on a scale of 1 to 10 at different time periods, they are doing so by reference to the scale rather than events in their life.1, 2 One of the more firmly established behavioral facts is the idea of an individual set point, whereby individuals generally revert to an initial level of well-being after experiencing events that send it up or down, but this is hardly a reason for concluding that nothing can improve in their lives.

Although people’s well-being is the ultimate aim of collective action, using it as a measurement is problematic.

Another issue is that the empirical literature is atheoretical, providing a weak basis for policy intervention in people’s lives. The conclusion from my research project on well-being is that while national policy could certainly be informed by top-down life satisfaction survey statistics, at smaller scales people’s well-being will depend on the context and on who is affected; the definition and measurement of well-being should be tailored appropriately, and it is not a very useful metric for policy at an aggregate level.

Why Not an Alternative Index?

GDP is calculated by summing up the total value of all final goods and services produced within a country’s borders during a specific period, typically a year. Over the years, several single indices as alternatives to GDP have been proposed. However, indices internalize the trade-offs to present a single number that advocates hope will dethrone conventional measures. Some of these are explicit about the social welfare framework they involve.

Another alternative is provided by Jones and Klenow (2016),3 who include consumption, leisure, inequality, and mortality in social welfare. They convert other indicators into “consumption-equivalent welfare,” which has a long tradition in economics.4 In their paper, they observe that France has much lower consumption per capita than the United States—it is only at 60 percent of the U.S. level—but less inequality, greater life expectancy at birth, and longer leisure hours. Their adjustment puts France at 92 percent of the consumption-equivalent level of the United States.

A well-established alternative to GDP is the Human Development Index (HDI), inspired by Nobel Prize winning economist Amartya Sen’s capabilities approach—improving access to the tools people use to live a fulfilling life. The index demonstrates the dangers of combining a number of indicators, each one measuring something relevant, without having a conceptual structure for the trade-offs and how the components should be weighted together. The late Martin Ravallion of the World Bank advocated for a multidimensional set of indicators, with the aggregation necessary to get to these being informed by talking to poor people about their priorities:

The role played by prices lies at the heart of the matter. It is widely agreed that prices can be missing for some goods and deceptive for others. There are continuing challenges facing applied economists in addressing these problems. However, it is one thing to recognize that markets and prices are missing or imperfect, and quite another to ignore them in welfare and poverty measurement. There is a peculiar inconsistency in the literature on multidimensional indices of poverty, whereby prices are regarded as an unreliable guide to the tradeoffs, and are largely ignored, while the actual weights being assumed in lieu of prices are not made explicit in the same space as prices. We have no basis for believing that the weights being used are any better than market price.5Why Not a Dashboard?

One frequent proposal, which certainly has intuitive appeal, is replacing the political and policy focus on GDP growth and related macroeconomic statistics with a broader dashboard. But there are three big challenges related to what to display on the dashboard. One, which indicators? A proliferation of alternatives has focused on what their advocates think is important rather than being shaped by either theory or broad consensus. So potential users face an array of possibilities and can select what interests them. Second, there are trade-offs and dependencies between indicators, and although dashboards could be designed to display these clearly, often they do not. Consequently, the third challenge is how to weight or display the various component indicators for decision purposes.

Table 1 lists the headline categories for four frequently cited dashboards, showing how little they overlap. The selection of indicators to represent an underlying concept is evidently arbitrary, in the sense that the lists do not have a clear theoretical basis, and the selection of indicators is generally determined by what data are available or even by political negotiation. For instance, I was told by someone closely involved in the process that the debate within the UN about the SDGs (Sustainable Development Goals) included a discussion about the definition of a tree; depending on the height specified in the definition, coffee bushes might or might not be included, which for some countries would affect their measure of deforestation. Practicality and arbitrary decisions certainly affect mainstream economic statistics too, but these result from decades of debate and practice among the community of relevant experts informed by a theoretical basis. We are not there yet with dashboards.

Still, there are many things people care about in life, even if one confines the question to their economic well-being. Indeed, one of my criticisms of using growth of real GDP as a guide was the flawed assumption that utility can be collapsed to a single dimension.

Comprehensive Wealth

If not well-being directly measured, nor (yet) a dashboard, nor a single index number alternative to GDP, what are the options? Consider comprehensive wealth. First, it embeds sustainability because of its focus on assets. Adding in effect a balance sheet recording stocks—or equivalently a full account of the flow of services provided by the assets—immediately highlights the key trade-off between present and future consumption. One measurement challenge is to identify the economically relevant assets and collect the underlying data. Focusing on assets revives an old debate in economics during the 1950s and early 1960s between the “two Cambridges”—Cambridge, Massachusetts, home to MIT and Harvard (where I did my PhD), and Cambridge, England (where I now work). That debate was about whether it made any sense to think of (physical) capital as a single aggregate when this would inevitably be a mash-up of many different types of physical buildings and equipment.

The American Cambridge (led by Paul Samuelson and Robert Solow) said yes, and the concept has become the “K” of production functions and growth accounting. The British Cambridge (particularly Piero Sraffa and Joan Robinson) disputed this, arguing for example that different vintages of capital would embed different generations of technology, so even a straightforward machine tool to stamp out components could not be aggregated with a twenty-year-old equivalent. Even the review articles discussing the debate (Cohen and Harcourt 2003,6 Stiglitz 19747) take sides, but the mainstream profession has given total victory to the U.S. single-aggregate version.

A balance-sheet approach also helps integrate the role of debt into consideration of progress.

A second point in favor of a comprehensive wealth approach is that investment for future consumption always involves different types of assets in combination. This means it will be important to consider not just the stocks of different assets—whether machines, patents, or urban trees (which cool the ambient temperature)—but also the extent to which the services they provide are substitutes or complements for each other: What is the correlation matrix? A patent for a new gadget will require investment in specific machines to put it into production and may benefit from tree planting if the production process heats the factory; the trees may substitute for an air-conditioning plant and also for concrete flood defenses downstream if their roots absorb enough rain. A recent paper8 highlights the importance of understanding the complementarities: “So long as a particular irreversible capital good remains with its project, in many cases until it is scrapped, its contribution comes not solely on its own account but as a result of complementarity with other capital goods. The project’s income is not composed of distinct contributions from individual assets.”

A balance-sheet approach also helps integrate the role of debt into consideration of progress. Debt is how consumption occurs now at the expense of consumption in future. In addition to financial debt, whether issued by governments or businesses or owed by individuals, there is a large and unmeasured burden of debt to nature. In a range of natural capital assets, including a stable climate, past and current consumption is reducing future opportunities.

In summary, to track sustainable economic welfare, a comprehensive wealth approach is desirable, identifying separately the types of assets that contribute capital services to economic actors. Some of them have no natural volume units. (You can count the number of isotope ratio mass spectrometers, but how do you count the accumulated know-how of a top law firm?) Many will not have a market price at all, and if they do, it is likely not to be the shadow price relevant to social welfare, so the monetary valuation needed to aggregate individual assets (by putting them into a common unit of account) is problematic.9 And the complementarities and substitutability across categories need to be better understood, including non-market assets such as organizational capabilities. (The development economics literature talks about this in terms of institutions or social capital; Singapore had few physical assets and little manufacturing industry to speak of in 1946, so it clearly relied on other assets to become one of the world’s highest per capita income countries.)

This is a challenging measurement agenda to say the least, but it is an obvious path for statistical development. Some readers will find the sustainability argument the most persuasive. There are two other supporting rationales, though. One is that a significant body of economic theory (appealing to both neoclassical and heterodox economists) supports it:10, 11 An increase in comprehensive wealth, at appropriately measured shadow prices, corresponds to an increase in social well-being. The other is that the statistical community has already started heading down this path with the agreement of UN statistical standards for measuring (some) natural capital and the services it provides.

The 2025 System of National Accounts (SNA) revision will include a little more detail about how official statisticians should be implementing this. It is a giant step forward, conceptually and practically— although it does not go far enough in that it insists on the use of valuations as close as possible to market prices, when the main issue in accounting for the environment is that markets grotesquely misprice resource use. (SNA is an internationally agreed-upon framework for compiling economic data, providing a standardized approach to measuring economic activity, including GDP and other key economic variables, facilitating analysis and policy-making.)

Conclusion

Today’s official framework for measuring the economy dates from an era when physical capital was scarce and natural resources were seemingly unconstrained. Manufacturing was the leading sector of the economy, and digital technology was in its infancy. The original national accounts were created using a mechanical calculating machine, not on a computer. Digital technologies have transformed the structure of production and consumption, and at a time of such significant structural change the supply side of the economy needs to be taken seriously. Policy decisions taken now will affect people’s lives for decades to come because the structure of so many industries is changing significantly. It is no wonder industrial policy is back in fashion among policymakers.

Unfortunately, there are yawning gaps in our basic statistics. Official statisticians do important work even as many governments have been cutting their budgets. However, the focus of the statistical agencies is on incremental improvement to the existing System of National Accounts, which will change for the better but not by much when the new standards are confirmed in 2025. There are huge data collection and analytical gaps in what is needed now, comprehensive wealth and time use, and a huge intellectual agenda when those statistics do become available. Just as the production of the first GDP figures gave birth to theories of economic growth, so sustainable balance sheet and time-use metrics will be generative for economists thinking about how societies progress.

The critiques of the earlier Beyond GDP movement have given way to a more constructive period of statistical innovation.

There is no doubt this area of economic statistics will continue to expand—because it is all too obvious that something new is needed. The critiques of the earlier Beyond GDP movement have given way to a more constructive period of statistical innovation—and I have given some examples of fruitful new methods and types of data.

However, I think some conclusions are clear. Measures that account for sustainability, natural and societal, are clearly imperative; the comprehensive wealth framework does this, and can potentially provide a broad scaffolding that others can use to tailor dashboards that serve specific purposes. A second conclusion is that while ideas have always driven innovation and progress, their role in adding value is even more central as the share of intangible value in the economy increases.

Finally, economic value added cannot be defined and measured without an underlying conception of value. This normative conception varies greatly between societies and over time, not least because of profound changes in technology and structure. It is a question of public philosophy as much as economics. Welfare economics has hardly moved on from the heyday of social choice theory in the 1970s, with social welfare defined as the sum of individual utilities; the philosophically rich capabilities approach has made little headway in everyday economics, except perhaps for development economics.

It is not yet clear whether the OECD economies will break away from the public philosophy of individualism and markets that has dominated policy for the past half century, despite all the critiques of neoliberalism; but the fact of popular discontent and its political consequences suggest they might. No wonder commentators so often reach for Gramsci’s famous Prison Notebooks comment, “The old order is dying and the new cannot be born; in this interregnum a great variety of morbid symptoms appear.”

Economic value added cannot be defined and measured without an underlying conception of value.

If a new shared understanding of economic value emerges from the changes underway now, it will look quite different. It will acknowledge the importance of context and variety, moving beyond averages and “representative consumers.” It will incorporate collective outcomes alongside individual ones, while recognizing the differences between them due to pervasive externalities, spillovers, and scale effects. And, it will embed the economy in nature, appreciating the resource constraints that limit future growth.

Excerpted and adapted by the author from The Measure of Progress: Counting What Really Matters © 2025 Diane Coyle. Reprinted with permission of Princeton University Press.

The Trump administration has dismissed all of the researchers working on the next installment of the National Climate Assessment, a crucial report on how climate change is affecting the country

As global demand for electric vehicles and renewable energy storage surges, so does the need for affordable and sustainable battery technologies. A new study has introduced an innovative solution that could impact electrochemical energy storage technologies.

Scientists usually use a hypergraph model to predict dynamic behaviors. But the opposite problem is interesting, too. What if researchers can observe the dynamics but don't have access to a reliable model? Scientists now have an answer. They describe a novel algorithm that can infer the structure of a hypergraph using only the observed dynamics.

Scientists usually use a hypergraph model to predict dynamic behaviors. But the opposite problem is interesting, too. What if researchers can observe the dynamics but don't have access to a reliable model? Scientists now have an answer. They describe a novel algorithm that can infer the structure of a hypergraph using only the observed dynamics.

Researchers have shown they can inexpensively nanomanufacture silk microneedles to precisely fortify crops, monitor plant health, and detect soil toxins.

A new study turns long-held conventional wisdom about a certain type of polymer on its head, greatly expanding understanding of how some of biochemistry's fundamental forces work. The study opens the door for new biomedical research running the gamut from analyzing and identifying proteins and carbohydrates to drug delivery.

Researchers have developed silk iron microparticles (SIMPs) -- magnetic, biodegradable carriers designed to deliver therapies directly to disease sites like aneurysms or tumors. The particles are created by chemically bonding iron oxide nanoparticles to regenerated silk fibroin using glutathione, enhancing their magnetic responsiveness while maintaining biocompatibility. These nanoscale carriers, roughly one-hundred-thousandth the width of a human hair, can potentially be guided externally to precise locations in the body. The platform enables localized delivery of therapeutic agents such as extracellular vesicles, regenerative factors, or drugs, offering a minimally invasive approach to treating conditions like abdominal aortic aneurysms and expanding the potential for targeted therapies in regenerative medicine.

For the first time, researchers can study the microstructures inside metals, ceramics and rocks with X-rays in a standard laboratory without needing to travel to a particle accelerator, according to engineers.

Traditional methods of looking into quantum systems often require immense resources. Researchers have now developed a new technique that allows scientists to extract essential information more efficiently and accurately.

Traditional methods of looking into quantum systems often require immense resources. Researchers have now developed a new technique that allows scientists to extract essential information more efficiently and accurately.

Getting missions to land successfully on the Moon has been difficult. Recent missions, such as IM-1 and IM-2, which the private company Intuitive Machines completed, have been qualified successes at best, with both landers settling at unintended angles and breaking parts of them off along the way. Such experiences offer excellent learning opportunities, though, and NASA is confident that a third time might be a charm for a flawless mission. There will be a lot riding on IM-3, the third Commercial Lunar Payload Services (CLPS) mission, including a set of rovers and ground station for a NASA experiment called the Cooperative Autonomous Distribution Robotic Exploration (CADRE), which recently passed its Verification and Validation (V&V) test for one of it's most essential parts. This software architecture handles tasks for each rover and binds them into a cohesive whole.

A rare stellar occultation, which happens only once every 30 years, allowed astronomers to observe Uranus and learn more about the composition of its atmosphere and rings.

Users of the r/ChangeMyView subreddit have expressed outrage at the revelation that researchers at the University of Zurich were secretly using the site for an AI-powered experiment in persuasion

The enigmatic Y chromosome has a tendency to disappear from cells with age. Now, research is revealing the long-term impacts this can have on disease risk and life expectancy

Researchers have developed a foolproof recipe for cacio e pepe, based on their findings studying the physics of mixing cheese in water and determining the mechanism that causes the cheese sauce to go from creamy to clumpy. The team found that a 2%-3% starch-to-cheese ratio produced the smoothest, most uniform sauce; they recommend using powdered starch, rather than relying on an unknown amount of starch in pasta water.

One of the most famous findings in physics could be wrong – the double-slit experiment was long thought to confirm that light can be a wave, but its results can be fully explained using only quantum particles

Putting air filters in classrooms seems to boost student attendance, which may be due to them reducing levels of air pollution, pollen, pathogens or all three

The Naturalistic Fallacy, which most of you surely know, it the erroneous equation of what does exist with what should exist.  Discussed extensively by Hume, it is the false equation of “is” with “ought”. In biology, it takes the form of observing some behavior in animals that is similar to a behavior in humans, and then justifying or saying the human behavior “natural”  or “good” because we see it in other species.

But this is a bad argument, for it cuts both ways. After all, animals show a lot of behavior that would be considered reprehensible or even immoral in humans.  In fact, Joan Roughgarden wrote a book, Evolution’s Rainbow, which describes sex and gender diversity in nature as an explicit way of justifying similar behaviors in humans as good—because they are natural. I reviewed the book for TLS and wrote this bit (review no longer online but I can send a copy).

Coyne, J. A.  2004.  Charm schools. (Review of Evolution’s Rainbow, by Joan Roughgarden). Times Literary Supplement, London. July 30, 2004 (No. 5287), p. 5.

But regardless of the truth of Darwin’s theory, should we consult nature to determine which of our behaviours are to be considered normal or moral? Homosexuality may indeed occur in species other than our own, but so do infanticide, robbery and extra-pair copulation.  If the gay cause is somehow boosted by parallels from nature, then so are the causes of child-killers, thieves and adulterers. And given the cultural milieu in which human sexuality and gender are expressed, how closely can we compare ourselves to other species? In what sense does a fish who changes sex resemble a transgendered person? The fish presumably experiences neither distressing feelings about inhabiting the wrong body, nor ostracism by other fish. In some baboons, the only males who show homosexual behaviour are those denied access to females by more dominant males. How can this possibly be equated to human homosexuality?

The step from “natural” to “ethical” is even riskier. As the philosopher G. E. Moore argued, identifying what is good or right by using any natural property is committing the “naturalistic fallacy”: there is no valid way to deduce “ought” from “is”. If no animals showed homosexual behaviour, would discrimination against gay humans be more justified? Certainly not. Roughgarden’s philosophical strategy is as problematic as her biological one.

Now a 2022 paper in Nature Communications had the potential to demonstrate the same fallacy, but fortunately the authors went to great lengths to avoid that  The same, however, is not true of a new take on this paper in a new article in ZME Science, which gave a précis of the paper and stepped on the Fallacy’s tail.

First the Nature paper itself, which you can access by clicking on the article below, or by reading the pdf here.

It’s a good paper on the evolution and phylogeny of “same-sex sexual behavior” in mammals, which they define as “transient courtship or mating interactions between members of the same sex“.  

Note that it’s “transient,” which explicitly excludes homosexuality, most notably in humans, which is a persistent sexual attraction to members of one’s own biological sex.  This form of transient sexual interaction is surprisingly common—a conservative estimate is 4% of all animal species, and, as the authors say, [includes] “all main groups from invertebrates such as insects, spiders, echinoderms, and nematodes, to vertebrates such as fish, amphibians, reptiles, birds, and mammals.”

Now there are two ways to explain a behavior that seems on its face maladaptive. Why would you engage in sexual behavior that doesn’t involve passing on your genes? One hypothesis is that it’s just a nonadaptive byproduct of other behaviors: a general drive to mate when the appropriate mates aren’t available, or simply mistaken identity.  But the authors investigate two hypotheses that it is adaptive, and give some tentative evidence for that.

First, the results:

• The authors did a comprehensive survey of same-sex behavior (defined above) in 2546 species of mammals, and superimposed species with and without such behavior on their phylogenetic tree. The object was to see how many times the behavior evolved independently, and whether it was present in the common ancestor of a group (and thus could be passed along to its descendants). Here’s one of those phylogenies with the caption. (You needn’t worry about the details or summary, as I’ll give it below).

(from paper) Phylogenetic distribution of the presence of same-sex sexual behaviour in males and females in the subset III (see methods). The state of the mammalian ancestral nodes was assessed using maximum likelihood estimation (black: same-sex sexual behaviour displayed by females; yellow: same-sex sexual behaviour displayed by males; purple: same-sex sexual behaviour displayed by both sexes). The silhouettes of representative mammals (downloaded from http://www.phylopic.org) illustrate the main mammalian clades. They have a Public Domain license without copyright (http://creativecommons.org/licenses/by/3.0).

A summary:

•  The behavior was reported in 261 mammalian species
• Same-sex sexual behavior appears to be equally common in males and females, and the behavior in both sexes tends to be correlated across groups. That is, male and female same-sex behavior is more likely to both appear in the same species than if it either were distributed randomly among groups.
• It was not possible tell, using phylogenetic analysis, whether same-sex behavior was likely to be a trait in the ancestor of all mammals, but was NOT likely to be a trait in the ancestor of all placental mammals.
• The behavior seems to have evolved independently in many lineages, so same-sex sexual behavior seems to be a case of “convergent evolution.”
• The behavior is correlated with whether or not a species is social. If it is social, there’s a significantly higher probability of same-sex sexual behavior. (Remember that this is a correlation and doesn’t imply that sociality prompts the evolution of such behavior. The behavior could simply result from iondividuals in social species being closer to other individuals than those in non-social species.)
• The common ancestor of all primates does seem to have possessed same-sex sexual behavior.

The association of same-sex sexual behavior with sociality leads the authors to conclude that the behavior evolved by natural selection as a way to enforce inter-individual harmony required by sociality. They mention two such advantages:

1.) Same-sex sexual behavior is a way of creating and maintaining social bonds between individuals in a group; it’s a bonding mechanism.
2.) The behavior could also help prevent or resolve conflicts between members of a group, allowing a hierarchy to develop without injury of death to group members.

The authors mention that these effects have been demonstrated in some species like bottlenose dolphins and American bison, but I’m not familiar with this work, and such conclusions seem to me to be extraordinarily difficult to arrive at. However, I’ll take the authors’ word for it.

The authors are, to be sure, careful in their conclusions. First, they note that nonadaptive hypotheses, like “mistaken identity” could also contribute to the behavior.

Second, and the big one, they note that the behavior they studied is not the same as homosexual behavior like we find in humans.  They do add, however, that it humans do show same-sex sexual behavior in humans (I presume they’re referring to “bisexual” people who have sex with both males and females). From the paper:

However, same-sex sexual behaviour is operationally defined here as any temporary sexual contact between members of the same sex2. This behaviour should be distinguished from homosexuality as a more permanent same sex preference, as found in humans. For this reason, our findings cannot be used to infer the evolution of sexual orientation, identity, and preference or the prevalence of homosexuality as categories of sexual beings Nevertheless, even taking into account this cautionary note, by using phylogenetic inference, our study may provide a potential explanation on the evolutionary history of the occurrence of same-sex sexual behaviour in humans.

They may be right, but I think they should have added that even if same-sex sexual behavior was rare or nonexistent in mammals, its existence in humans is not made “ethical” or “natural” in our species. That would be an example of the naturalistic fallacy, and I emphasize that they do not commit it.  I’d would also emphasize, as I did above, that any sexual behavior between consenting human adults is not for us to judge, regardless of whether or not other species show it, and that such behaviors are fine so long as they’re legal. We don’t need to justify same-sex sexual behavior in humans by seeing it elsewhere in nature. But perhaps this stuff doesn’t belong in a scientific paper. But I want to emphasize it here, as I did in my review of Roughgarden’s book.

As I said, the authors don’t commit the naturalistic fallacy, but the new ZME Science paper below comes close to it. Click headline to read:

Up until the end, this article is okay, but then it can’t resist diving into our own species (bolding is mine).

However, the researchers distinguish between SSSB and sexual orientation. While SSSB involves occasional same-sex interactions, sexual orientation encompasses consistent patterns of attraction and identity, particularly prominent in humans.

While SSSB in animals supports the naturalness of such behaviors, human experiences of sexuality include layers of identity, culture, and personal meaning that go beyond biological explanations. Homosexuality in humans often involves stable sexual orientations and relationships, distinct from the transient or context-dependent SSSB observed in some animal species.

Ultimately, the widespread occurrence of SSSB in mammals, especially primates, strongly suggests that such behaviors are natural and adaptive. Normalizing same-sex behavior as a part of this spectrum aligns with both biological evidence and a broader understanding of human social and emotional complexity.

The last paragraph explicitly says that the results show that homosexuality (one of “such behaviors”) is “natural and adaptive”, as are all “same-sex behaviors” in humans.  The Nature paper says nothing of the sort.  The authors of the Nature paper explicitly exclude homosexuality as not a behavior they studied, but ZME Science lumps it in with other same-sex sexual behaviors, dwspite homosexuality being very different from SSSB.

Again, you do NOT need to justify same-sex sexual behavior, whether it be transient or permanent, by finding examples in the natural world. If we didn’t find any other species with homosexual behavior, would that make it wrong or bad in humans? Of course not! “Is” does not equal “ought,” and I’ll add the corollary that “not is” does not equal “not ought”. The Nature paper is valuable it looking at the evolution of a behavior and testing hypotheses about its adaptiveness, but of course adaptiveness or evolution has nothing to do with the ethics of behaviors between consenting human adults.