syndication

How did eastern North America form?

crust, plate tectonics, Science, syndication / Mike M. / April 7, 2025

Collisions hold lessons for how the edges of continents are built and change over time.

When Maureen Long talks to the public about her work, she likes to ask her audience to close their eyes and think of a landscape with incredible geology. She hears a lot of the same suggestions: Iceland, the Grand Canyon, the Himalayas. “Nobody ever says Connecticut,” says Long, a geologist at Yale University in New Haven in that state.

And yet Connecticut—along with much of the rest of eastern North America—holds important clues about Earth’s history. This region, which geologists call the eastern North American margin, essentially spans the US eastern seaboard and a little farther north into Atlantic Canada. It was created over hundreds of millions of years as slivers of Earth’s crust collided and merged. Mountains rose, volcanoes erupted and the Atlantic Ocean was born.

Much of this geological history has become apparent only in the past decade or so, after scientists blanketed the United States with seismometers and other instruments to illuminate geological structures hidden deep in Earth’s crust. The resulting findings include many surprises—from why there are volcanoes in Virginia to how the crust beneath New England is weirdly crumpled.

The work could help scientists better understand the edges of continents in other parts of the world; many say that eastern North America is a sort of natural laboratory for studying similar regions. And that’s important. “The story that it tells about Earth history and about this set of Earth processes … [is] really fundamental to how the Earth system works,” says Long, who wrote an in-depth look at the geology of eastern North America for the 2024 Annual Review of Earth and Planetary Sciences.

Born of continental collisions

The bulk of North America today is made of several different parts. To the west are relatively young and mighty mountain ranges like the Sierra Nevada and the Rockies. In the middle is the ancient heart of the continent, the oldest and stablest rocks around. And in the east is the long coastal stretch of the eastern North American margin. Each of these has its own geological history, but it is the story of the eastern bit that has recently come into sharper focus.

For decades, geologists have understood the broad picture of how eastern North America came to be. It begins with plate tectonics, the process in which pieces of Earth’s crust shuffle around over time, driven by churning motions in the underlying mantle. Plate tectonics created and then broke apart an ancient supercontinent known as Rodinia. By around 550 million years ago, a fragment of Rodinia had shuffled south of the equator, where it lay quietly for tens of millions of years. That fragment is the heart of what we know today as eastern North America.

Then, around 500 million years ago, tectonic forces started bringing fragments of other landmasses toward the future eastern North America. Carried along like parts on an assembly line, these continental slivers crashed into it, one after another. The slivers glommed together and built up the continental margin.

During that process, as more and more continental collisions crumpled eastern North America and thrust its agglomerated slivers into the sky, the Appalachian Mountains were born. To the west, the eastern North American margin had merged with ancient rocks that today make up the heart of the continent, west of the Appalachians and through the Midwest and into the Great Plains.

When one tectonic plate slides beneath another, slivers of Earth’s crust, known as terranes, can build up and stick together, forming a larger landmass. Such a process was key to the formation of eastern North America. Credit: Knowable Magazine

By around 270 million years ago, that action was done, and all the world’s landmasses had merged into a second single supercontinent, Pangaea. Then, around 200 million years ago, Pangaea began splitting apart, a geological breakup that formed the Atlantic Ocean, and eastern North America shuffled toward its current position on the globe.

Since then, erosion has worn down the peaks of the once-mighty Appalachians, and eastern North America has settled into a mostly quiet existence. It is what geologists call a “passive margin,” because although it is the edge of a continent, it is not the edge of a tectonic plate anymore: That lies thousands of miles out to the east, in the middle of the Atlantic Ocean.

In many parts of the world, passive continental margins are just that—passive, and pretty geologically boring. Think of the eastern edge of South America or the coastline around the United Kingdom; these aren’t places with active volcanoes, large earthquakes, or other major planetary activity.

But eastern North America is different. There’s so much going on there that some geologists have humorously dubbed it a “passive-aggressive margin.”

The eastern edge of North America, running along the US seaboard, contains fragments of different landscapes that attest to its complex birth. They include slivers of Earth’s crust that glommed together along what is now the east coast, with a more ancient mountain belt to their west and a chunk of even more ancient crust to the west of that. Credit: Knowable Magazine

That action includes relatively high mountains—for some reason, the Appalachians haven’t been entirely eroded away even after tens to hundreds of millions of years—as well as small volcanoes and earthquakes. Recent east-coast quakes include the magnitude-5.8 tremor near Mineral, Virginia, in 2011, and a magnitude-3.8 blip off the coast of Maine in January 2025. So geological activity exists in eastern North America. “It’s just not following your typical tectonic activity,” says Sarah Mazza, a petrologist at Smith College in Northampton, Massachusetts.

Crunching data on the crust

Over decades, geologists had built up a history of eastern North America by mapping rocks on Earth’s surface. But they got a much better look, and many fresh insights, starting around 2010. That’s after a federally funded research project known as EarthScope blanketed the continental United States with seismometers. One aim was to gather data on how seismic energy from earthquakes reverberated through the Earth’s crust and upper mantle. Like a CT scan of the planet, that information highlights structures that lie beneath the surface and would not otherwise be detected.

With EarthScope, researchers could suddenly see what parts of the crust were warm or cold, or strong or weak—information that told them what was happening underground. Having the new view was like astronomers going from looking at the stars with binoculars to using a telescope, Long says. “You can see more detail, and you can see finer structure,” she says. “A lot of features that we now know are present in the upper mantle beneath eastern North America, we really just did not know about.”

And then scientists got even better optics. Long and other researchers began putting out additional seismometers, packing them in dense lines and arrays over the ground in places where they wanted even better views into what was going on beneath the surface, including Georgia and West Virginia. Team members would find themselves driving around the countryside to carefully set up seismometer stations, hoping these would survive the snowfall and spiders of a year or two until someone could return to retrieve the data.

The approach worked—and geophysicists now have a much better sense of what the crust and upper mantle are doing under eastern North America. For one thing, they found that the thickness of the crust varies from place to place. Parts that are the remains of the original eastern North America landmass have a much thicker crust, around 45 kilometers. The crust beneath the continental slivers that attached later on to the eastern edge is much thinner, more like 25 to 30 kilometers thick. That difference probably traces back to the formation of the continent, Long says.

Seismic studies have revealed in recent years that Earth’s crust varies dramatically in thickness along the eastern seaboard—a legacy of how this region was pieced together from various landmasses over time. Credit: Knowable Magazine

But there’s something even weirder going on. Seismic images show that beneath parts of New England, it’s as if parts of the crust and upper mantle have slid atop one another. A 2022 study led by geoscientist Yantao Luo, a colleague of Long, found that the boundary that marks the bottom of Earth’s crust—often referred to as the Moho, after the Croatian seismologist Andrija Mohorovičić—was stacked double, like two overlapping pancakes, under southern New England.

The result was so surprising that at first Long didn’t think it could be right. But Luo double-checked and triple-checked, and the answer held. “It’s this super-unusual geometry,” Long says. “I’m not sure I’ve seen it anywhere else.”

It’s particularly odd because the Moho in this region apparently has managed to maintain its double-stacking for hundreds of millions of years, says Long. How that happened is a bit of a mystery. One idea is that the original landmass of eastern North America had an extremely strong and thick crust. When weaker continental slivers began arriving and glomming on to it, they squeezed up and over it in places.

How the Moho is working

The force of that collision could have carried the Moho of the incoming pieces up and over the older landmass, resulting in a doubling of the Moho there, says Paul Karabinos, a geologist at Williams College in Williamstown, Massachusetts. Something similar might be happening in Tibet today as the tectonic plate carrying India rams into that of Asia and crumples the crust against the Tibetan plateau. Long and her colleagues are still trying to work out how widespread the stacked-Moho phenomenon is across New England; already, they have found more signs of it beneath northwestern Massachusetts.

A second surprising discovery that emerged from the seismic surveys is why 47-million-year-old volcanoes along the border of Virginia and West Virginia might have erupted. The volcanoes are the youngest eruptions that have happened in eastern North America. They are also a bit of a mystery, since there is no obvious source of molten rock in the passive continental margin that could be fueling them.

The answer, once again, came from detailed seismic scans of the Earth. These showed that a chunk was missing from the bottom of Earth’s crust beneath the volcanoes: For some reason, the bottom of the crust became heavy and dripped downward from the top part, leaving a gap. “That now needs to be filled,” says Mazza. Mantle rocks obligingly flowed into the gap, experiencing a drop in pressure as they moved upward. That change in pressure triggered the mantle rocks to melt—and created the molten reservoir that fueled the Virginia eruptions.

The same process could be happening in other passive continental margins, Mazza says. Finding it beneath Virginia is important because it shows that there are more and different ways to fuel volcanoes in these areas than scientists had previously thought possible: “It goes into these ideas that you have more ways to create melt than your standard tectonic process,” she says.

Long and her colleagues are looking to see whether other parts of the eastern North American margin also have this crustal drip. One clue is emerging from how seismic energy travels through the upper mantle throughout the region. The rocks beneath the Virginia volcanoes show a strange slowdown, or anomaly, as seismic energy passes through them. That could be related to the crustal dripping that is going on there.

Seismic surveys have revealed a similar anomaly in northern New England. To try to unravel what might be happening at this second anomaly, Long’s team currently has one string of seismometers across Massachusetts, Vermont, and New Hampshire, and a second dense array in eastern Massachusetts. “Maybe something like what went on in Virginia might be in process … elsewhere in eastern North America,” Long says. “This might be a process, not just something that happened one time.”

Long even has her eyes on pushing farther north, to do seismic surveys along the continental margin in Newfoundland, and even across to Ireland—which once lay next to the North American continental margin, until the Atlantic Ocean opened and separated them. Early results suggest there may be significant differences in how the passive margin behaved on the North American side and on the Irish side, Long’s collaborator Roberto Masis Arce of Rutgers University reported at the American Geophysical Union conference in December 2024.

All these discoveries go to show that the eastern North American margin, once deemed a bit of a snooze, has far more going for it than one might think. “Passive doesn’t mean geologically inactive,” Mazza says. “We live on an active planet.”

This article originally appeared in Knowable Magazine, a nonprofit publication dedicated to making scientific knowledge accessible to all. Sign up for Knowable Magazine’s newsletter.

Knowable Magazine explores the real-world significance of scholarly work through a journalistic lens.

How did eastern North America form? Read More »

USDA cuts could cause long-term damage, reverse hard-won progress

agriculture, climate change, Science, syndication, Trump, USDA / Kris Guyer / April 6, 2025

For decades, environmental and farm groups pushed Congress, the USDA and farmers to adopt new conservation programs, but progress came in incremental steps. With each Farm Bill, some lawmakers threaten to whittle down conservation programs, but they have essentially managed to survive and even expand.

The country’s largest farm lobby, the American Farm Bureau Federation, had long denied the realities of climate change, fighting against climate action and adopting official policy positions that question the scientific consensus that climate change is human-caused. Its members—the bulk of American farmers—largely adhered to the same mindset.

But as the realities of climate change have started to hit American farmers on the ground in the form of more extreme weather, and as funding opportunities have expanded through conservation and climate-focused programs, that mindset has started to shift.

“They were concerned about what climate policy meant for their operations,” Bonnie said. “They felt judged. But we said: Let’s partner up.”

The Trump administration’s rollbacks and freezes threaten to stall or undo that progress, advocacy groups and former USDA employees say.

“We created this enormous infrastructure. We’ve solved huge problems,” Bonnie added, “and they’re undermining all of it.”

“It took so long,” Stillerman said. “The idea that climate change was happening and that farmers could be part of the solution, and could build more resilient farming and food systems against that threat—the IRA really put dollars behind that. All of that is at risk now.”

Burk says he plans to continue with conservation and carbon-storing practices on his Michigan farm, even without conservation dollars from the USDA.

But, he says, many of his neighboring farmers likely will stop conservation measures without the certainty of government support.

“So many people are struggling, just trying to figure out how to pay their bills, to get the fuel to run their tractors, to plant,” he said. “The last thing they want to be doing is sitting down with someone from NRCS who says, ‘If I do these things, maybe I’ll get paid in a year.’ That’s not going to happen.”

This story originally appeared on Inside Climate News.

USDA cuts could cause long-term damage, reverse hard-won progress Read More »

NASA’s Curiosity rover has found the longest chain carbon molecules yet on Mars

Curiosity rover, mars rover, NASA, Science, Space, syndication / Mike M. / March 31, 2025

NASA’s Curiosity Mars rover has detected the largest organic (carbon-containing) molecules ever found on the red planet. The discovery is one of the most significant findings in the search for evidence of past life on Mars. This is because, on Earth at least, relatively complex, long-chain carbon molecules are involved in biology. These molecules could actually be fragments of fatty acids, which are found in, for example, the membranes surrounding biological cells.

Scientists think that, if life ever emerged on Mars, it was probably microbial in nature. Because microbes are so small, it’s difficult to be definitive about any potential evidence for life found on Mars. Such evidence needs more powerful scientific instruments that are too large to be put on a rover.

The organic molecules found by Curiosity consist of carbon atoms linked in long chains, with other elements bonded to them, like hydrogen and oxygen. They come from a 3.7-billion-year-old rock dubbed Cumberland, encountered by the rover at a presumed dried-up lakebed in Mars’s Gale Crater. Scientists used the Sample Analysis at Mars (SAM) instrument on the NASA rover to make their discovery.

Scientists were actually looking for evidence of amino acids, which are the building blocks of proteins and therefore key components of life as we know it. But this unexpected finding is almost as exciting. The research is published in Proceedings of the National Academies of Science.

Among the molecules were decane, which has 10 carbon atoms and 22 hydrogen atoms, and dodecane, with 12 carbons and 26 hydrogen atoms. These are known as alkanes, which fall under the umbrella of the chemical compounds known as hydrocarbons.

It’s an exciting time in the search for life on Mars. In March this year, scientists presented evidence of features in a different rock sampled elsewhere on Mars by the Perseverance rover. These features, dubbed “leopard spots” and “poppy seeds,” could have been produced by the action of microbial life in the distant past, or not. The findings were presented at a US conference and have not yet been published in a peer-reviewed journal.

NASA’s Curiosity rover has found the longest chain carbon molecules yet on Mars Read More »

What could possibly go wrong? DOGE to rapidly rebuild Social Security codebase.

Biz & IT, cobol, doge, elon musk, Java, Policy, syndication / Paul Patrick / March 30, 2025

Like many legacy government IT systems, SSA systems contain code written in COBOL, a programming language created in part in the 1950s by computing pioneer Grace Hopper. The Defense Department essentially pressured private industry to use COBOL soon after its creation, spurring widespread adoption and making it one of the most widely used languages for mainframes, or computer systems that process and store large amounts of data quickly, by the 1970s. (At least one DOD-related website praising Hopper’s accomplishments is no longer active, likely following the Trump administration’s DEI purge of military acknowledgements.)

As recently as 2016, SSA’s infrastructure contained more than 60 million lines of code written in COBOL, with millions more written in other legacy coding languages, the agency’s Office of the Inspector General found. In fact, SSA’s core programmatic systems and architecture haven’t been “substantially” updated since the 1980s when the agency developed its own database system called MADAM, or the Master Data Access Method, which was written in COBOL and Assembler, according to SSA’s 2017 modernization plan.

SSA’s core “logic” is also written largely in COBOL. This is the code that issues social security numbers, manages payments, and even calculates the total amount beneficiaries should receive for different services, a former senior SSA technologist who worked in the office of the chief information officer says. Even minor changes could result in cascading failures across programs.

“If you weren’t worried about a whole bunch of people not getting benefits or getting the wrong benefits, or getting the wrong entitlements, or having to wait ages, then sure go ahead,” says Dan Hon, principal of Very Little Gravitas, a technology strategy consultancy that helps government modernize services, about completing such a migration in a short timeframe.

It’s unclear when exactly the code migration would start. A recent document circulated amongst SSA staff laying out the agency’s priorities through May does not mention it, instead naming other priorities like terminating “non-essential contracts” and adopting artificial intelligence to “augment” administrative and technical writing.

What could possibly go wrong? DOGE to rapidly rebuild Social Security codebase. Read More »

The CDC buried a measles forecast that stressed the need for vaccinations

CDC, health, measles, measles anti-vaccine, measles outbreak, rfk jr, syndication / Rejus Almole / March 30, 2025

ProPublica is a Pulitzer Prize-winning investigative newsroom. Sign up for The Big Story newsletter to receive stories like this one in your inbox.

Leaders at the Centers for Disease Control and Prevention ordered staff this week not to release their experts’ assessment that found the risk of catching measles is high in areas near outbreaks where vaccination rates are lagging, according to internal records reviewed by ProPublica.

In an aborted plan to roll out the news, the agency would have emphasized the importance of vaccinating people against the highly contagious and potentially deadly disease that has spread to 19 states, the records show.

A CDC spokesperson told ProPublica in a written statement that the agency decided against releasing the assessment “because it does not say anything that the public doesn’t already know.” She added that the CDC continues to recommend vaccines as “the best way to protect against measles.”

But what the nation’s top public health agency said next shows a shift in its long-standing messaging about vaccines, a sign that it may be falling in line under Health and Human Services Secretary Robert F. Kennedy Jr., a longtime critic of vaccines:

“The decision to vaccinate is a personal one,” the statement said, echoing a line from a column Kennedy wrote for the Fox News website. “People should consult with their healthcare provider to understand their options to get a vaccine and should be informed about the potential risks and benefits associated with vaccines.”

ProPublica shared the new CDC statement about personal choice and risk with Jennifer Nuzzo, director of the Pandemic Center at Brown University School of Public Health. To her, the shift in messaging, and the squelching of this routine announcement, is alarming.

“I’m a bit stunned by that language,” Nuzzo said. “No vaccine is without risk, but that makes it sound like it’s a very active coin toss of a decision. We’ve already had more cases of measles in 2025 than we had in 2024, and it’s spread to multiple states. It is not a coin toss at this point.”

For many years, the CDC hasn’t minced words on vaccines. It promoted them with confidence. One campaign was called “Get My Flu Shot.” The agency’s website told medical providers they play a critical role in helping parents choose vaccines for their children: “Instead of saying ‘What do you want to do about shots?,’ say ‘Your child needs three shots today.’”

Nuzzo wishes the CDC’s forecasters would put out more details of their data and evidence on the spread of measles, not less. “The growing scale and severity of this measles outbreak and the urgent need for more data to guide the response underscores why we need a fully staffed and functional CDC and more resources for state and local health departments,” she said.

Kennedy’s agency oversees the CDC and on Thursday announced it was poised to eliminate 2,400 jobs there.

When asked what role, if any, Kennedy played in the decision to not release the risk assessment, HHS’s communications director said the aborted announcement “was part of an ongoing process to improve communication processes—nothing more, nothing less.” The CDC, he reiterated, continues to recommend vaccination “as the best way to protect against measles.”

“Secretary Kennedy believes that the decision to vaccinate is a personal one and that people should consult with their healthcare provider to understand their options to get a vaccine,” Andrew G. Nixon said. “It is important that the American people have radical transparency and be informed to make personal healthcare decisions.”

Responding to questions about criticism of the decision among some CDC staff, Nixon wrote, “Some individuals at the CDC seem more interested in protecting their own status or agenda rather than aligning with this Administration and the true mission of public health.”

The CDC’s risk assessment was carried out by its Center for Forecasting and Outbreak Analytics, which relied, in part, on new disease data from the outbreak in Texas. The CDC created the center to address a major shortcoming laid bare during the COVID-19 pandemic. It functions like a National Weather Service for infectious diseases, harnessing data and expertise to predict the course of outbreaks like a meteorologist warns of storms.

Other risk assessments by the center have been posted by the CDC even though their conclusions might seem obvious.

In late February, for example, forecasters analyzing the spread of H5N1 bird flu said people who come “in contact with potentially infected animals or contaminated surfaces or fluids” faced a moderate to high risk of contracting the disease. The risk to the general US population, they said, was low.

In the case of the measles assessment, modelers at the center determined the risk of the disease for the general public in the US is low, but they found the risk is high in communities with low vaccination rates that are near outbreaks or share close social ties to those areas with outbreaks. The CDC had moderate confidence in the assessment, according to an internal Q&A that explained the findings. The agency, it said, lacks detailed data about the onset of the illness for all patients in West Texas and is still learning about the vaccination rates in affected communities as well as travel and social contact among those infected. (The H5N1 assessment was also made with moderate confidence.)

The internal plan to roll out the news of the forecast called for the expert physician who’s leading the CDC’s response to measles to be the chief spokesperson answering questions. “It is important to note that at local levels, vaccine coverage rates may vary considerably, and pockets of unvaccinated people can exist even in areas with high vaccination coverage overall,” the plan said. “The best way to protect against measles is to get the measles, mumps, and rubella (MMR) vaccine.”

This week, though, as the number of confirmed cases rose to 483, more than 30 agency staff were told in an email that after a discussion in the CDC director’s office, “leadership does not want to pursue putting this on the website.”

The cancellation was “not normal at all,” said a CDC staff member who spoke anonymously for fear of reprisal with layoffs looming. “I’ve never seen a rollout plan that was canceled at that far along in the process.”

Anxiety among CDC staff has been building over whether the agency will bend its public health messages to match those of Kennedy, a lawyer who founded an anti-vaccine group and referred clients to a law firm suing a vaccine manufacturer.

During Kennedy’s first week on the job, HHS halted the CDC campaign that encouraged people to get flu shots during a ferocious flu season. On the night that the Trump administration began firing probationary employees across the federal government, some key CDC flu webpages were taken down. Remnants of some of the campaign webpages were restored after NPR reported this.

But some at the agency felt like the new leadership had sent a message loud and clear: When next to nobody was paying attention, long-standing public health messages could be silenced.

On the day in February that the world learned that an unvaccinated child had died of measles in Texas, the first such death in the U.S. since 2015, the HHS secretary downplayed the seriousness of the outbreak. “We have measles outbreaks every year,” he said at a cabinet meeting with President Donald Trump.

In an interview on Fox News this month, Kennedy championed doctors in Texas who he said were treating measles with a steroid, an antibiotic and cod liver oil, a supplement that is high in vitamin A. “They’re seeing what they describe as almost miraculous and instantaneous recovery from that,” Kennedy said.

As parents near the outbreak in Texas stocked up on vitamin A supplements, doctors there raced to assure parents that only vaccination, not the vitamin, can prevent measles.

Still, the CDC added an entry on Vitamin A to its measles website for clinicians.

On Wednesday, CNN reported that several hospitalized children in Lubbock, Texas, had abnormal liver function, a likely sign of toxicity from too much vitamin A.

Texas health officials also said that the Trump administration’s decision to rescind $11 billion in pandemic-related grants across the country will hinder their ability to respond to the growing outbreak, according to The Texas Tribune.

Measles is among the most contagious diseases and can be dangerous. About 20 percent of unvaccinated people who get measles wind up in the hospital. And nearly 1 to 3 of every 1,000 children with measles will die from respiratory and neurologic complications. The virus can linger in the air for two hours after an infected person has left an area, and patients can spread measles before they even know they have it.

This week Amtrak said it was notifying customers that they may have been exposed to the disease this month when a passenger with measles rode one of its trains from New York City to Washington, DC.

The CDC buried a measles forecast that stressed the need for vaccinations Read More »

EU will go easy with Apple, Facebook punishment to avoid Trump’s wrath

Apple, EU, Google, Policy, syndication, Tech / Kris Guyer / March 30, 2025

Brussels regulators are set to drop a case about whether Apple’s operating system discourages users from switching browsers or search engines, after Apple made a series of changes in an effort to comply with the bloc’s rules.

Levying any form of fines on American tech companies risks a backlash, however, as Trump has directly attacked EU penalties on American companies, calling them a “form of taxation,” while comparing fines on tech companies with “overseas extortion.”

“This is a crucial test for the commission,” a person from one of the affected companies said. “Further targeting US tech firms will heighten transatlantic tensions and provoke retaliatory actions and, ultimately, it’s member states and European businesses that will bear the cost.”

The US president has warned of imposing tariffs on countries that levy digital services taxes against American companies.

According to a memo released last month, Trump said he would look into taxes and regulations or policies that “inhibit the growth” of American corporations operating abroad.

Meta has previously said that its changes “meet EU regulator demands and go beyond what’s required by EU law.”

The planned decisions, which the officials said could still change before they are made public, are set to be presented to representatives of the EU’s 27 member states on Friday. An announcement on the fines is set for next week, although that timing could also still change.

The commission declined to comment.

EU will go easy with Apple, Facebook punishment to avoid Trump’s wrath Read More »

Trump administration’s blockchain plan for USAID is a real head-scratcher

Blockchain, Policy, syndication, Trump, USAID / Rejus Almole / March 24, 2025

Giulio Coppi, a senior humanitarian officer at the nonprofit Access Now who has researched the use of blockchain in humanitarian work, says that blockchain technologies, while sometimes effective, offer no obvious advantages over other tools organizations could use, such as an existing payments system or another database tool. “There’s no proven advantage that it’s cheaper or better,” he says. “The way it’s been presented is this tech solutionist approach that has been proven over and over again to not have any substantial impact in reality.”

There have been, however, some successful instances of using blockchain technology in the humanitarian sector. In 2022, the United Nations High Commissioner for Refugees (UNHCR) ran a small pilot to give cash assistance to Ukrainians displaced by the Russia-Ukraine war in a stablecoin. Other pilots have been tested in Kenya by the Kenya Red Cross Society. The International Committee of the Red Cross, which works with the Kenya team, also helped to develop the Humanitarian Token Solution (HTS).

One representative from an NGO that uses blockchain technology, but wasn’t authorized to speak to the media with regards to issues relating to USAID, says that particularly with regards to money transfers, stablecoins can be faster and easier than other methods of reaching communities impacted by a disaster. However, “introducing new systems means you’re setting up a new burden” for the many organizations that USAID partners with, they say. “The relative cost of new systems is harder for small NGOs,” which would often include the kind of local organizations that would be at the front line of response to disasters.

The proposed adoption of blockchain technology seems related to an emphasis on exerting tight controls over aid. The memo seems, for example, to propose that funding should be contingent on outcomes, reading, “Tying payment to outcomes and results rather than inputs would ensure taxpayer dollars deliver maximum impact.” A USAID employee, who asked to remain anonymous because they were not authorized to speak to the media, says that many of USAID’s contracts already function this way, with organizations being paid after performing their work. However, that’s not possible in all situations. “Those kinds of agreements are often not flexible enough for the environments we work in,” they say, noting that in conflict or disaster zones, situations can change quickly, meaning that what an organization may be able to do or need to do can fluctuate.

Raftree says this language appears to be misleading, and bolsters claims made by Musk and the administration that USAID was corrupt. “It’s not like USAID was delivering tons of cash to people who hadn’t done things,” she says.

This story originally appeared on wired.com.

Trump administration’s blockchain plan for USAID is a real head-scratcher Read More »

How the language of job postings can attract rule-bending narcissists

hiring, narcississm, psychology, Science, Social science, syndication / Kris Guyer / March 23, 2025

Why it matters

Companies write job postings carefully in hopes of attracting the ideal candidate. However, they may unknowingly attract and select narcissistic candidates whose goals and ethics might not align with a company’s values or long-term success. Research shows that narcissistic employees are more likely to behave unethically, potentially leading to legal consequences.

While narcissistic traits can lead to negative outcomes, we aren’t saying that companies should avoid attracting narcissistic applicants altogether. Consider a company hiring a salesperson. A firm can benefit from a salesperson who is persuasive, who “thinks outside the box,” and who is “results-oriented.” In contrast, a company hiring an accountant or compliance officer would likely benefit from someone who “thinks methodically” and “communicates in a straightforward and accurate manner.”

Bending the rules is of particular concern in accounting. A significant amount of research examines how accounting managers sometimes bend rules or massage the numbers to achieve earnings targets. This “earnings management” can misrepresent the company’s true financial position.

In fact, my co-author Nick Seybert is currently working on a paper whose data suggests rule-bender language in accounting job postings predicts rule-bending in financial reporting.

Our current findings shed light on the importance of carefully crafting job posting language. Recruiting professionals may instinctively use rule-bender language to try to attract someone who seems like a good fit. If companies are concerned about hiring narcissists, they may want to clearly communicate their ethical values and needs while crafting a job posting, or avoid rule-bender language entirely.

What still isn’t known

While we find that professional recruiters are using language that attracts narcissists, it is unclear whether this is intentional.

Additionally, we are unsure what really drives rule-bending in a company. Rule-bending could happen due to attracting and hiring more narcissistic candidates, or it could be because of a company’s culture—or a combination of both.

The Research Brief is a short take on interesting academic work.

Jonathan Gay is Assistant Professor of Accountancy at the University of Mississippi.

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

How the language of job postings can attract rule-bending narcissists Read More »

For climate and livelihoods, Africa bets big on solar mini-grids

africa, Nigeria, Science, solar panels, syndication / Tim Belzer / March 16, 2025

Nigeria is pioneering the development of small, off-grid solar panel installations.

A general view of a hybrid minigrids station in Doma Town which is mainly powered by solar energy in Doma, Nassarawa State, Nigeria on October 16, 2023. Credit: Kola Sulaimon/AFP via Getty Images

To the people of Mbiabet Esieyere and Mbiabet Udouba in Nigeria’s deep south, sundown would mean children doing their homework by the glow of kerosene lamps, and the faint thrum of generators emanating from homes that could afford to run them. Like many rural communities, these two villages of fishermen and farmers in the community of Mbiabet, tucked away in clearings within a dense palm forest, had never been connected to the country’s national electricity grid.

Most of the residents had never heard of solar power either. When, in 2021, a renewable-energy company proposed installing a solar “mini-grid” in their community, the villagers scoffed at the idea of the sun powering their homes. “We didn’t imagine that something [like this] can exist,” says Solomon Andrew Obot, a resident in his early 30s.

The small installation of solar panels, batteries and transmission lines proposed by the company Prado Power would service 180 households in Mbiabet Esieyere and Mbiabet Udouba, giving them significantly more reliable electricity for a fraction of the cost of diesel generators. Village leaders agreed to the installation, though many residents remained skeptical. But when the panels were set up in 2022, lights blinked on in the brightly painted two-room homes and tan mud huts dotted sparsely through the community. At a village meeting in September, locals erupted into laughter as they recalled walking from house to house, turning on lights and plugging in phone chargers. “I [was] shocked,” Andrew Obot says.

Like many African nations, Nigeria has lagged behind Global North countries in shifting away from planet-warming fossil fuels and toward renewable energy. Solar power contributes just around 3 percent of the total electricity generated in Africa—though it is the world’s sunniest continent—compared to nearly 12 percent in Germany and 6 percent in the United States.

At the same time, in many African countries, solar power now stands to offer much more than environmental benefits. About 600 million Africans lack reliable access to electricity; in Nigeria specifically, almost half of the 230 million people have no access to electricity grids. Today, solar has become cheap and versatile enough to help bring affordable, reliable power to millions—creating a win-win for lives and livelihoods as well as the climate.

That’s why Nigeria is placing its bets on solar mini-grids—small installations that produce up to 10 megawatts of electricity, enough to power over 1,700 American homes—that can be set up anywhere. Crucially, the country has pioneered mini-grid development through smart policies to attract investment, setting an example for other African nations.

Nearly 120 mini-grids are now installed, powering roughly 50,000 households and reaching about 250,000 people. “Nigeria is actually like a poster child for mini-grid development across Africa,” says energy expert Rolake Akinkugbe-Filani, managing director of EnergyInc Advisors, an energy infrastructure consulting firm.

Though it will take more work—and funding—to expand mini-grids across the continent, Nigeria’s experience demonstrates that they could play a key role in weaning African communities off fossil-fuel-based power. But the people who live there are more concerned with another, immediate benefit: improving livelihoods. Affordable, reliable power from Mbiabet’s mini-grid has already supercharged local businesses, as it has in many places where nonprofits like Clean Technology Hub have supported mini-grid development, says Ifeoma Malo, the organization’s founder. “We’ve seen how that has completely transformed those communities.”

The African energy transition takes shape

Together, Africa’s countries account for less than 5 percent of global carbon dioxide emissions, and many experts, like Malo, take issue with the idea that they need to rapidly phase out fossil fuels; that task should be more urgent for the United States, China, India, the European countries and Russia, which create the bulk of emissions. Nevertheless, many African countries have set ambitious phase-out goals. Some have already turned to locally abundant renewable energy sources, like geothermal power from the Earth’s crust, which supplies nearly half of the electricity produced in Kenya, and hydropower, which creates more than 80 percent of the electricity in the Democratic Republic of Congo, Ethiopia and Uganda.

But hydropower and geothermal work only where those resources naturally exist. And development of more geographically versatile power sources, like solar and wind, has progressed more slowly in Africa. Though solar is cheaper than fossil-fuel-derived electricity in the long term, upfront construction costs are often higher than they are for building new fossil-fuel power plants.

Thanks to its sunny, equatorial position, the African continent has an immense potential for solar power, shown here in kilowatt-hours. However, solar power contributes less than 3 percent of the electricity generated in Africa. Credit: Knowable Magazine

Getting loans to finance big-ticket energy projects is especially hard in Africa, too. Compared to Europe or the United States, interest rates for loans can be two to three times higher due to perceived risks—for instance, that cash-strapped utility companies, already struggling to collect bills from customers, won’t be able to pay back the loans. Rapid political shifts and currency fluctuations add to the uncertainty. To boot, some Western African nations such as Nigeria charge high tariffs on importing technologies such as solar panels. “There are challenges that are definitely hindering the pace at which renewable energy development could be scaling in the region,” says renewable energy expert Tim Reber of the Colorado-based US National Renewable Energy Laboratory.

Some African countries are beginning to overcome these barriers and spur renewable energy development, notes Bruno Merven, an expert in energy systems modeling at the University of Cape Town in South Africa, coauthor of a look at renewable energy development in the Annual Review of Resource Economics. Super-sunny Morocco, for example, has phased out subsidies for gasoline and industrial fuel. South Africa is agreeing to buy power from new, renewable infrastructure that is replacing many coal plants that are now being retired.

Nigeria, where only about a quarter of the national grid generates electricity and where many turn to generators for power, is leaning on mini-grids—since expanding the national grid to its remote communities, scattered across an area 1.3 times the size of Texas, would cost a prohibitive amount in the tens of billions of dollars. Many other countries are in the same boat. “The only way by which we can help to electrify the entire continent is to invest heavily in renewable energy mini-grids,” says Stephen Kansuk, the United Nations Development Program’s regional technical advisor for Africa on climate change mitigation and energy issues.

Experts praise the steps Nigeria has taken to spur such development. In 2016, the country’s Electricity Regulatory Commission provided legal guidelines on how developers, electricity distribution companies, regulators and communities can work together to develop the small grids. This was accompanied by a program through which organizations like the World Bank, the Global Energy Alliance for People and Planet, Bezos Earth Fund and the Rockefeller Foundation could contribute funds, making mini-grid investments less financially risky for developers.

Solar power was also made more attractive by a recent decision by Nigerian President Bola Ahmed Tinubu to remove a long-standing government subsidy on petroleum products. Fossil-fuel costs have been soaring since, for vehicles as well as the generators that many communities rely on. Nigeria has historically been Africa’s largest crude oil producer, but fuel is now largely unaffordable for the average Nigerian, including those living in rural areas, who often live on less than $2 a day. In the crude-oil-rich state of Akwa Ibom, where the Mbiabet villages are located, gasoline was 1,500 naira per liter (around $1) at the time of publishing. “Now that subsidies have come off petrol,” says Akinkugbe-Filani, “we’re seeing a lot more people transition to alternative sources of energy.”

Mini-grids take off

To plan a mini-grid in Nigeria, developers often work with government agencies that have mapped out ideal sites: sunny places where there are no plans to extend the national grid, ensuring that there’s a real power need.

More than 500 million Africans lack access to electricity, and where there is electricity, much of it comes from fossil fuels. Countries are taking different approaches to bring more renewable energy into the mix. Nigeria is focusing on mini-grids, which are especially useful in areas that lack national electricity grids. Morocco and South Africa are building large-scale solar power installations, while Kenya and the Democratic Republic of the Congo are making use of local renewable energy sources like geothermal and hydropower, respectively. Credit: Knowable Magazine

The next step is getting communities on board, which can take months. Malo recalls a remote Indigenous village in the hills of Adamawa state in Nigeria’s northeast, where locals have preserved their way of life for hundreds of years and are wary of outsiders. Her team had almost given up trying to liaise with reluctant male community leaders and decided to try reaching out to the women. The women, it turned out, were fascinated by the technology and how it could help them, especially at night — to fetch water from streams, to use the bathroom and to keep their children safe from snakes. “We find that if we convince them, they’re able to go and convince their husbands,” Malo says.

The Mbiabet community took less convincing. Residents were drawn to the promise of cheap, reliable electricity and its potential to boost local businesses.

Like many other mini-grids, the one in Mbiabet benefited from a small grant, this one from the Rocky Mountain Institute, a US-based nonprofit focused on renewable energy adoption. The funds allowed residents to retain 20 percent ownership of the mini-grid and reduced upfront costs for Prado Power, which built the panels with the help of local laborers.

On a day in late September, it’s a sunny afternoon, though downpours from the days before have made their imprint on the ground. There are no paved roads and today, the dirt road leading through the tropical forest into the cluster of villages is unnavigable by car. At one point, we build an impromptu bridge of grass and vegetation across a sludgy impasse; the last stretch of the journey is made on foot. It would be costly and labor-intensive to extend the national grid here.

Palm trees give way to tin roofs propped up by wooden poles, and Andrew Obot is waiting at the meeting point. He was Mbiabet’s vice youth president when Prado Power first contacted the community; now he’s the site manager. He steers his okada—a local motorbike—up the bumpy red dirt road to go see the solar panels.

Along the way, we see transmission lines threading through thick foliage. “That’s the solar power,” shouts Andrew Obot over the drone of the okada engine. All the lines were built by Prado Power to supply households in the two villages.

We enter a grassy clearing where three rows of solar panels sit behind wire gates. Collectively, the 39 panels have a capacity of over 20 kilowatts—enough to power just one large, energy-intensive American household but more than enough for the lightbulbs, cooker plates and fans in the 180 households in Mbiabet Esieyere and Mbiabet Udouba.

Whereas before, electricity was more conservatively used, now it is everywhere. An Afrobeats tune blares from a small barbershop on the main road winding through Mbiabet Esieyere. Inside, surrounded by walls plastered with shiny posters of trending hairstyles — including a headshot of popular musician Davido with the tagline “BBC—Big Boyz Cutz”—two young girls sit on a bench near a humming fan, waiting for their heads to be shaved.

The salon owner, Christian Aniefiok Asuquo, started his business two years ago when he was 16, just before the panels were installed. Back then, his appliances were powered by a diesel generator, which he would fill with 2,000 naira worth (around $1.20) of fuel daily. This would last around an hour. Now, he spends just 2,000 naira a month on electricity. “I feel so good,” he says, and his customers, too, are happy. He used to charge 500 naira ($0.30) per haircut, but now charges 300 naira ($0.18) and still makes a profit. He has more customers these days.

For many Mbiabet residents, “it’s an overall boost in their economic development,” says Suleiman Babamanu, the Rocky Mountain Institute’s program director in Nigeria. Also helping to encourage residents to take full advantage of their newly available power is the installation of an “agro-processing hub,” equipped with crop-processing machines and a community freezer to store products like fish. Provided by the company Farm Warehouse in partnership with Prado Power, the hub is leased out to locals. It includes a grinder and fryer to process cassava—the community’s primary crop—into garri, a local food staple, which many of the village women sell to neighboring communities and at local markets.

The women are charged around 200 naira ($0.12) to process a small basin of garri from beginning to end. Sarah Eyakndue Monday, a 24-year-old cassava farmer, used to spend three to four hours processing cassava each day; it now takes her less than an hour. “It’s very easy,” she says with a laugh. She produces enough garri during that time to earn up to 50,000 naira ($30.25) a week—almost five times what she was earning before.

Prado Power also installed a battery system to save some power for nighttime (there’s a backup diesel generator should batteries become depleted during multiple overcast days). That has proved especially valuable to women in Mbiabet Esieyere and Mbiabet Udouba, who now feel safer. “Everywhere is … brighter than before,” says Eyakndue Monday.

Other African communities have experienced similar benefits, according to Renewvia Energy, a US-based solar company. In a recent company-funded survey, 2,658 Nigerian and Kenyan households and business owners were interviewed before and after they got access to Renewvia’s mini-grids. Remarkably, the median income of Kenyan households had quadrupled. Instead of spending hours each day walking kilometers to collect drinking water, many communities were able to install electricity-powered wells or pumps, along with water purifiers.

“With all of that extra time, women in the community were able to either start their own businesses or just participate in businesses that already exist,” says Renewvia engineer Nicholas Selby, “and, with that, gain some income for themselves.”

Navigating mini-grid challenges

Solar systems require regular maintenance—replacing retired batteries, cleaning, and repairing and addressing technical glitches over the 20- to 25-year lifetime of a panel. Unless plans for care are built into a project, they risk failure. In some parts of India, for example, thousands of mini-grids installed by the government in recent decades have fallen into disrepair, according to a report provided to The Washington Post. Typically, state agencies have little long-term incentive to maintain solar infrastructure, Kansuk says.

Kansuk says this is less likely in situations where private companies that make money off the grids help to fund them, encouraging them to install high-quality devices and maintain them. It also helps to train locals with engineering skills so they can maintain the panels themselves—companies like Renewvia have done this at their sites. Although Prado Power hasn’t been able to provide such training to locals in Mbiabet or their other sites, they recruit locals like Andrew Obot to work as security guards, site managers and construction workers.

Over the longer term, demographic shifts may also leave some mini-grids in isolated areas abandoned—as in northern Nigeria, for instance, where banditry and kidnapping are forcing rural populations toward more urban settings. “That’s become a huge issue,” Malo says. Partly for this reason, some developers are focusing on building mini-grids in regions that are less prone to violence and have higher economic activity—often constructing interconnected mini-grids that supply multiple communities.

Eventually, those close enough to the national grid will likely be connected to the larger system, says Chibuikem Agbaegbu, a Nigeria-based climate and energy expert of the Africa Policy Research Institute. They can send their excess solar-sourced electricity into the main grid, thus making a region’s overall energy system greener and more reliable.

The biggest challenge for mini-grids, however, is cost. Although they tend to offer cheaper, more reliable electricity compared to fossil-fuel-powered generators, it is still quite expensive for many people — and often much more costly than power from national grids, which is frequently subsidized by African governments. Costs can be even higher when communities sprawl across large areas that are expensive to connect.

Mini-grid companies have to charge relatively high rates in order to break even, and many communities may not be buying enough power to make a mini-grid worthwhile for the developers — for instance, Kansuk says, if residents want electricity only for lighting and to run small household appliances.

Kansuk adds that this is why developers like Prado Power still rely on grants or other funding sources to subsidize construction costs so they can charge locals affordable prices for electricity. Another solution, as evidenced in Mbiabet, is to introduce industrial machinery and equipment in tandem with mini-grids to increase local incomes so that people can afford the electricity tariffs.

“For you to be able to really transform lives in rural communities, you need to be able to improve the business viability—both for the mini-grid and for the community,” says Babamanu. The Rocky Mountain Institute is part of an initiative that identifies suitable electrical products, from cold storage to rice mills to electric vehicle chargers, and supports their installation in communities with the mini-grids.

Spreading mini-grids across the continent

Energy experts believe that these kinds of solutions will be key for expanding mini-grids across Africa. Around 60 million people in the continent gained access to electricity through mini-grids between 2009 and 2019, in countries such as Kenya, Tanzania and Senegal, and the United Nations Development Program is working with a total of 21 African countries, Kansuk says, including Mali, Niger and Somalia, to incentivize private companies to develop mini-grids there.

But it takes more than robust policies to help mini-grids thrive. Malo says it would help if Western African countries removed import tariffs for solar panels, as many governments in Eastern Africa have done. And though Agbaegbu estimates that Nigeria has seen over $900 million in solar investments since 2018—and the nation recently announced $750 million more through a multinationally funded pro gram that aims to provide over 17.5 million Nigerians with electricity access—it needs more. “If you look at what is required versus what is available,” says Agbaegbu, “you find that there’s still a significant gap.”

Many in the field argue that such money should come from more industrialized, carbon-emitting countries to help pay for energy development in Global South countries in ways that don’t add to the climate problem; some also argue for funds to compensate for damages caused by climate impacts, which hit these countries hardest. At the 2024 COP29 climate change conference, wealthy nations set a target of $300 billion in annual funding for climate initiatives in other countries by 2035—three times more than what they had previously pledged. But African countries alone need an estimated $200 billion per year by 2030 to meet their energy goals, according to the International Energy Agency.

Meanwhile, Malo adds, it’s important that local banks in countries like Nigeria also invest in mini-grid development, to lessen dependence on foreign financing. That’s especially the case in light of current freezes in USAID funding, she says, which has resulted in a loss of money for solar projects in Nigeria and other nations.

With enough support, Reber says, mini-grids—along with rooftop and larger solar projects—could make a sizable contribution to lowering carbon emissions in Africa. Those who already have the mini-grids seem convinced they’re on the path toward a better, economically richer future, and Babamanu knows of communities that have written letters to policymakers to express their interest.

Eyakndue Monday, the cassava farmer from Mbiabet, doesn’t keep her community’s news a secret. Those she has told now come to her village to charge their phones and watch television. “I told a lot of my friends that our village is … better because of the light,” she says. “They were just happy.”

This story was originally published by Knowable Magazine.

Knowable Magazine explores the real-world significance of scholarly work through a journalistic lens.

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NCI employees can’t publish information on these topics without special approval

Department of Health and Human Services, health, National Cancer Institute, rfk jr, Science, syndication, trump administration / Rejus Almole / March 11, 2025

The list is “an unusual mix of words that are tied to activities that this administration has been at war with—like equity, but also words that they purport to be in favor of doing something about, like ultraprocessed food,” Tracey Woodruff, director of the Program on Reproductive Health and the Environment at the University of California, San Francisco, said in an email.

The guidance states that staffers “do not need to share content describing the routine conduct of science if it will not get major media attention, is not controversial or sensitive, and does not touch on an administration priority.”

A longtime senior employee at the institute said that the directive was circulated by the institute’s communications team, and the content was not discussed at the leadership level. It is not clear in which exact office the directive originated. The NCI, NIH and HHS did not respond to ProPublica’s emailed questions. (The existence of the list was first revealed in social media posts on Friday.)

Health and research experts told ProPublica they feared the chilling effect of the new guidance. Not only might it lead to a lengthier and more complex clearance process, it may also cause researchers to censor their work out of fear or deference to the administration’s priorities.

“This is real interference in the scientific process,” said Linda Birnbaum, a former director of the National Institute of Environmental Health Sciences who served as a federal scientist for four decades. The list, she said, “just seems like Big Brother intimidation.”

During the first two months of Donald Trump’s second presidency, his administration has slashed funding for research institutions and stalled the NIH’s grant application process.

Kennedy has suggested that hundreds of NIH staffers should be fired and said that the institute should deprioritize infectious diseases like COVID-19 and shift its focus to chronic diseases, such as diabetes and obesity.

Obesity is on the NCI’s new list, as are infectious diseases including COVID-19, bird flu and measles.

The “focus on bird flu and covid is concerning,” Woodruff wrote, because “not being transparent with the public about infectious diseases will not stop them or make them go away and could make them worse.”

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Huh? The valuable role of interjections

history of language, language, Science, syndication / Paul Patrick / March 10, 2025

Utterances like um, wow, and mm-hmm aren’t garbage—they keep conversations flowing.

Interjections—one-word utterances that aren’t part of a larger sentence—used to be dismissed as irrelevant linguistic detritus. But some linguists now think they play an essential role in regulating conversations. Credit: Daniel Garcia/Knowable Magazine

Listen carefully to a spoken conversation and you’ll notice that the speakers use a lot of little quasi-words—mm-hmm, um, huh? and the like—that don’t convey any information about the topic of the conversation itself. For many decades, linguists regarded such utterances as largely irrelevant noise, the flotsam and jetsam that accumulate on the margins of language when speakers aren’t as articulate as they’d like to be.

But these little words may be much more important than that. A few linguists now think that far from being detritus, they may be crucial traffic signals to regulate the flow of conversation as well as tools to negotiate mutual understanding. That puts them at the heart of language itself—and they may be the hardest part of language for artificial intelligence to master.

“Here is this phenomenon that lives right under our nose, that we barely noticed,” says Mark Dingemanse, a linguist at Radboud University in the Netherlands, “that turns out to upend our ideas of what makes complex language even possible in the first place.”

For most of the history of linguistics, scholars have tended to focus on written language, in large part because that’s what they had records of. But once recordings of conversation became available, they could begin to analyze spoken language the same way as writing.

When they did, they observed that interjections—that is, short utterances of just a word or two that are not part of a larger sentence—were ubiquitous in everyday speech. “One in every seven utterances are one of these things,” says Dingemanse, who explores the use of interjections in the 2024 Annual Review of Linguistics. “You’re going to find one of those little guys flying by every 12 seconds. Apparently, we need them.”

Many of these interjections serve to regulate the flow of conversation. “Think of it as a tool kit for conducting interactions,” says Dingemanse. “If you want to have streamlined conversations, these are the tools you need.” An um or uh from the speaker, for example, signals that they’re about to pause, but aren’t finished speaking. A quick huh? or what? from the listener, on the other hand, can signal a failure of communication that the speaker needs to repair.

That need seems to be universal: In a survey of 31 languages around the world, Dingemanse and his colleagues found that all of them used a short, neutral syllable similar to huh? as a repair signal, probably because it’s quick to produce. “In that moment of difficulty, you’re going to need the simplest possible question word, and that’s what huh? is,” says Dingemanse. “We think all societies will stumble on this, for the same reason.”

Other interjections serve as what some linguists call “continuers,” such as mm-hmm — signals from the listener that they’re paying attention and the speaker should keep going. Once again, the form of the word is well suited to its function: Because mm-hmm is made with a closed mouth, it’s clear that the signaler does not intend to speak.

Sign languages often handle continuers differently, but then again, two people signing at the same time can be less disruptive than two people speaking, says Carl Börstell, a linguist at the University of Bergen in Norway. In Swedish Sign Language, for example, listeners often sign yes as a continuer for long stretches, but to keep this continuer unobtrusive, the sender tends to hold their hands lower than usual.

Different interjections can send slightly different signals. Consider, for example, one person describing to another how to build a piece of Ikea furniture, says Allison Nguyen, a psycholinguist at Illinois State University. In such a conversation, mm-hmm might indicate that the speaker should continue explaining the current step, while yeah or OK would imply that the listener is done with that step and it’s time to move on to the next.

Wow! There’s more

Continuers aren’t merely for politeness—they really matter to a conversation, says Dingemanse. In one classic experiment from more than two decades ago, 34 undergraduate students listened as another volunteer told them a story. Some of the listeners gave the usual “I’m listening” signals, while others—who had been instructed to count the number of words beginning with the letter t—were too distracted to do so. The lack of normal signals from the listeners led to stories that were less well crafted, the researchers found. “That shows that these little words are quite consequential,” says Dingemanse.

Nguyen agrees that such words are far from meaningless. “They really do a lot for mutual understanding and mutual conversation,” she says. She’s now working to see if emojis serve similar functions in text conversations.

Storytellers depend on feedback such as mm-hmm and other interjections from their listeners. In this experiment, some listeners were told to count the number of times the storyteller used a word starting with t—a challenging task that prevented them from giving normal feedback. The quality of storytelling declined significantly, with problems like abrupt endings, rambling on, uneven or choppy pacing and overexplaining or justifying the point. Credit: Knowable Magazine

The role of interjections goes even deeper than regulating the flow of conversation. Interjections also help in negotiating the ground rules of a conversation. Every time two people converse, they need to establish an understanding of where each is coming from: what each participant knows to begin with, what they think the other person knows and how much detail they want to hear. Much of this work—what linguists call “grounding”—is carried out by interjections.

“If I’m telling you a story and you say something like ‘Wow!’ I might find that encouraging and add more detail,” says Nguyen. “But if you do something like, ‘Uh-huh,’ I’m going to assume you aren’t interested in more detail.”

A key part of grounding is working out what each participant thinks about the other’s knowledge, says Martina Wiltschko, a theoretical linguist at the Catalan Institution for Research and Advanced Studies in Barcelona, Spain. Some languages, like Mandarin, explicitly differentiate between “I’m telling you something you didn’t know” and “I’m telling you something that I think you knew already.” In English, that task falls largely on interjections.

One of Wiltschko’s favorite examples is the Canadian eh? “If I tell you you have a new dog, I’m usually not telling you stuff you don’t know, so it’s weird for me to tell you,” she says. But ‘You have a new dog, eh?’ eliminates the weirdness by flagging the statement as news to the speaker, not the listener.

Other interjections can indicate that the speaker knows they’re not giving the other participant what they sought. “If you ask me what’s the weather like in Barcelona, I can say ‘Well, I haven’t been outside yet,’” says Wiltschko. The well is an acknowledgement that she’s not quite answering the question.

Wiltschko and her students have now examined more than 20 languages, and every one of them uses little words for negotiations like these. “I haven’t found a language that doesn’t do these three general things: what I know, what I think you know and turn-taking,” she says. They are key to regulating conversations, she adds: “We are building common ground, and we are taking turns.”

Details like these aren’t just arcana for linguists to obsess over. Using interjections properly is a key part of sounding fluent in speaking a second language, notes Wiltschko, but language teachers often ignore them. “When it comes to language teaching, you get points deducted for using ums and uhs, because you’re ‘not fluent,’” she says. “But native speakers use them, because it helps! They should be taught.” Artificial intelligence, too, can struggle to use interjections well, she notes, making them the best way to distinguish between a computer and a real human.

And interjections also provide a window into interpersonal relationships. “These little markers say so much about what you think,” she says—and they’re harder to control than the actual content. Maybe couples therapists, for example, would find that interjections afford useful insights into how their clients regard one another and how they negotiate power in a conversation. The interjection oh often signals confrontation, she says, as in the difference between “Do you want to go out for dinner?” and “Oh, so now you want to go out for dinner?”

Indeed, these little words go right to the heart of language and what it is for. “Language exists because we need to interact with one another,” says Börstell. “For me, that’s the main reason for language being so successful.”

Dingemanse goes one step further. Interjections, he says, don’t just facilitate our conversations. In negotiating points of view and grounding, they’re also how language talks about talking.

“With huh? you say not just ‘I didn’t understand,’” says Dingemanse. “It’s ‘I understand you’re trying to tell me something, but I didn’t get it.’” That reflexivity enables more sophisticated speech and thought. Indeed, he says, “I don’t think we would have complex language if it were not for these simple words.”

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New research shows bigger animals get more cancer, defying decades-old belief

animal research, cancer, cancer research, Science, syndication / Tim Belzer / March 9, 2025

The answer lies in how quickly body size evolves. We found that birds and mammals that reached large sizes more rapidly have reduced cancer prevalence. For example, the common dolphin, Delphinus delphis evolved to reach its large body size—along with most other whales and dolphins (referred to as cetaceans) about three times faster than other mammals. However, cetaceans tend to have less cancer than expected.

Larger species face higher cancer risks but those that reached that size rapidly evolved mechanisms for mitigating it, such as lower mutation rates or enhanced DNA repair mechanisms. So rather than contradicting Cope’s rule, our findings refine it.

Larger bodies often evolve, but not as quickly in groups where the burden of cancer is higher. This means that the threat of cancer may have shaped the pace of evolution.

Humans evolved to our current body size relatively rapidly. Based on this, we would expect humans and bats to have similar cancer prevalence, because we evolved at a much, much faster rate. However, it is important to note that our results can’t explain the actual prevalence of cancer in humans. Nor is that an easy statistic to estimate.

Human cancer is a complicated story to unravel, with a plethora of types and many factors affecting its prevalence. For example, many humans not only have access to modern medicine but also varied lifestyles that affect cancer risk. For this reason, we did not include humans in our analysis.

Fighting cancer

Understanding how species naturally evolve cancer defences has important implications for human medicine. The naked mole rat, for example, is studied for its exceptionally low cancer prevalence in the hopes of uncovering new ways to prevent or treat cancer in humans. Only a few cancer cases have ever been observed in captive mole rats, so the exact mechanisms of their cancer resistance remain mostly a mystery.

At the same time, our findings raise new questions. Although birds and mammals that evolved quickly seem to have stronger anti-cancer mechanisms, amphibians and reptiles didn’t show the same pattern. Larger species had higher cancer prevalence regardless of how quickly they evolved. This could be due to differences in their regenerative abilities. Some amphibians, like salamanders, can regenerate entire limbs—a process that involves lots of cell division, which cancer could exploit.

Putting cancer into an evolutionary context allowed us to reveal that its prevalence does increase with body size. Studying this evolutionary arms race may unlock new insights into how nature fights cancer—and how we might do the same.

Joanna Baker, Postdoctoral Researcher in Evolutionary Biology, University of Reading and George Butler, Career Development Fellow in Cancer Evolution, UCL. This article is republished from The Conversation under a Creative Commons license. Read the original article.

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