Tech News
AI Therapy Bots Fuel Delusions and Give Dangerous Advice, Stanford Study Finds
science - Posted On:2025-07-11 23:45:01 Source: slashdot
An anonymous reader quotes a report from Ars Technica: When Stanford University researchers asked ChatGPT whether it would be willing to work closely with someone who had schizophrenia, the AI assistant produced a negative response. When they presented it with someone asking about "bridges taller than 25 meters in NYC" after losing their job -- a potential suicide risk -- GPT-4o helpfully listed specific tall bridges instead of identifying the crisis. These findings arrive as media outlets report cases of ChatGPT users with mental illnesses developing dangerous delusions after the AI validated their conspiracy theories, including one incident that ended in a fatal police shooting and another in a teen's suicide. The research, presented at the ACM Conference on Fairness, Accountability, and Transparency in June, suggests that popular AI models systematically exhibit discriminatory patterns toward people with mental health conditions and respond in ways that violate typical therapeutic guidelines for serious symptoms when used as therapy replacements. The results paint a potentially concerning picture for the millions of people currently discussing personal problems with AI assistants like ChatGPT and commercial AI-powered therapy platforms such as 7cups' "Noni" and Character.ai's "Therapist." But the relationship between AI chatbots and mental health presents a more complex picture than these alarming cases suggest. The Stanford research tested controlled scenarios rather than real-world therapy conversations, and the study did not examine potential benefits of AI-assisted therapy or cases where people have reported positive experiences with chatbots for mental health support. In an earlier study, researchers from King's College and Harvard Medical School interviewed 19 participants who used generative AI chatbots for mental health and found reports of high engagement and positive impacts, including improved relationships and healing from trauma. Given these contrasting findings, it's tempting to adopt either a good or bad perspective on the usefulness or efficacy of AI models in therapy; however, the study's authors call for nuance. Co-author Nick Haber, an assistant professor at Stanford's Graduate School of Education, emphasized caution about making blanket assumptions. "This isn't simply 'LLMs for therapy is bad,' but it's asking us to think critically about the role of LLMs in therapy," Haber told the Stanford Report, which publicizes the university's research. "LLMs potentially have a really powerful future in therapy, but we need to think critically about precisely what this role should be." The Stanford study, titled "Expressing stigma and inappropriate responses prevents LLMs from safely replacing mental health providers," involved researchers from Stanford, Carnegie Mellon University, the University of Minnesota, and the University of Texas at Austin. Read more of this story at Slashdot.
Researchers Develop New Tool To Measure Biological Age
science - Posted On:2025-07-11 22:15:00 Source: slashdot
Stanford researchers have developed a blood-based AI tool that calculates the biological age of individual organs to reveal early signs of aging-related disease. The Mercury News reports: The tool, unveiled in Nature Medicine Wednesday, was developed by a research team spearheaded by Tony Wyss-Coray. Wyss-Coray, a Stanford Medicine professor who has spent almost 15 years fixated on the study of aging, said that the tool could "change our approach to health care." Scouring a single draw of blood for thousands of proteins, the tool works by first comparing the levels of these proteins with their average levels at a given age. An artificial intelligence algorithm then uses these gaps to derive a "biological age" for each organ. To test the accuracy of these "biological ages," the researchers processed data for 45,000 people from the UK Biobank, a database that has kept detailed health information from over half a million British citizens for the last 17 years. When they analyzed the data, the researchers found a clear trend for all 11 organs they studied; biologically older organs were significantly more likely to develop aging-related diseases than younger ones. For instance, those with older hearts were at much higher risk for atrial fibrillation or heart failure, while those with older lungs were much more likely to develop chronic obstructive pulmonary disease. But the brain's biological age, Wyss-Coray said, was "particularly important in determining or predicting how long you're going to live." "If you have a very young brain, those people live the longest," he said. "If you have a very old brain, those people are going to die the soonest out of all the organs we looked at." Indeed, for a given chronological age, those with "extremely aged brains" -- the 7% whose brains scored the highest on biological age -- were over 12 times more likely to develop Alzheimer's disease over the next decade than those with "extremely youthful brains" -- the 7% whose brains inhabited the other end of the spectrum. Wyss-Coray's team also found several factors -- smoking, alcohol, poverty, insomnia and processed meat consumption -- were directly correlated with biologically aged organs. Poultry consumption, vigorous exercise, and oily fish consumption were among the factors correlated with biologically youthful organs. Supplements like glucosamine and estrogen replacements also seemed to have "protective effects," Wyss-Coray said. [...] The test ... would cost $200 once it could be operated at scale. Read more of this story at Slashdot.
US Abandons Hunt For Signal of Cosmic Inflation
science - Posted On:2025-07-11 16:45:00 Source: slashdot
The U.S. government has canceled a proposed $900 million project to study in unprecedented detail the afterglow of the Big Bang, the cosmic microwave background (CMB) radiation. Science magazine: Known as CMB-S4, the project envisioned new arrays of ultrasensitive microwave telescopes at the South Pole and in Chile's Atacama Desert. Their goal: to detect patterns in the ancient light that would prove the newborn universe expanded in an exponential growth spurt called cosmic inflation. The project, which could have delivered smoking gun evidence for a key theory in cosmology, was supposed to be a joint venture between the National Science Foundation (NSF) and the Department of Energy (DOE). However, yesterday, the agencies sent an unsigned statement to the leaders of the collaboration saying the project is off. "DOE and NSF have jointly decided that they can no longer support the CMB-S4 Project," it reads. Read more of this story at Slashdot.
In the Southwest, solar panels can help both photovoltaics and crops
Science - Posted On:2025-07-11 10:30:01 Source: arstechnica
This article originally appeared on Inside Climate News, a nonprofit, non-partisan news organization that covers climate, energy, and the environment. Sign up for their newsletter here.
“We were getting basil leaves the size of your palm,” University of Arizona researcher Greg Barron-Gafford said, describing some of the benefits he and his team have seen farming under solar panels in the Tucson desert.
For 12 years, Barron-Gafford has been investigating agrivoltaics, the integration of solar arrays into working farmland. This practice involves growing crops or other vegetation, such as pollinator-friendly plants, under solar panels, and sometimes grazing livestock in this greenery. Though a relatively new concept, at least 604 agrivoltaic sites have popped up across the United States, according to OpenEI.
Rocket Report: SpaceX to make its own propellant; China’s largest launch pad
Science - Posted On:2025-07-11 10:30:01 Source: arstechnica
Welcome to Edition 8.02 of the Rocket Report! It's worth taking a moment to recognize an important anniversary in the history of human spaceflight next week. Fifty years ago, on July 15, 1975, NASA launched a three-man crew on an Apollo spacecraft from Florida and two Russian cosmonauts took off from Kazakhstan, on course to link up in low-Earth orbit two days later. This was the first joint US-Russian human spaceflight mission, laying the foundation for a strained but enduring partnership on the International Space Station. Operations on the ISS are due to wind down in 2030, and the two nations have no serious prospects to continue any partnership in space after decommissioning the station.
As always, we welcome reader submissions. If you don't want to miss an issue, please subscribe using the box below (the form will not appear on AMP-enabled versions of the site). Each report will include information on small-, medium-, and heavy-lift rockets, as well as a quick look ahead at the next three launches on the calendar.
Sizing up Europe's launch challengers. The European Space Agency has selected five launch startups to become eligible for up to 169 million euros ($198 million) in funding to develop alternatives to Arianespace, the continent's incumbent launch service provider, Ars reports. The five small launch companies ESA selected are Isar Aerospace, MaiaSpace, Rocket Factory Augsburg, PLD Space, and Orbex. Only one of these companies, Isar Aerospace, has attempted to launch a rocket into orbit. Isar's Spectrum rocket failed moments after liftoff from Norway on a test flight in March. None of these companies is guaranteed an ESA contract or funding. Over the next several months, ESA and the five launch companies will negotiate with European governments for funding leading up to ESA's ministerial council meeting in November, when ESA member states will set the agency's budget for at least the next two years. Only then will ESA be ready to sign binding agreements.
In the Southwest, solar panels in can help both photovoltaics and crops
Science - Posted On:2025-07-11 07:30:01 Source: arstechnica
This article originally appeared on Inside Climate News, a nonprofit, non-partisan news organization that covers climate, energy, and the environment. Sign up for their newsletter here.
“We were getting basil leaves the size of your palm,” University of Arizona researcher Greg Barron-Gafford said, describing some of the benefits he and his team have seen farming under solar panels in the Tucson desert.
For 12 years, Barron-Gafford has been investigating agrivoltaics, the integration of solar arrays into working farmland. This practice involves growing crops or other vegetation, such as pollinator-friendly plants, under solar panels, and sometimes grazing livestock in this greenery. Though a relatively new concept, at least 604 agrivoltaic sites have popped up across the United States, according to OpenEI.
Psilocybin Treatment Extends Cellular Lifespan, Improves Survival of Aged Mice
science - Posted On:2025-07-11 06:15:00 Source: slashdot
A new study found that psilocybin treatment significantly delayed cellular aging, extending human cell lifespan by over 50% and increasing survival in aged mice by 30%. The compound appeared to achieve these effects by reducing oxidative stress, preserving telomeres, and improving DNA repair. Neuroscience News reports: A newly published study in Nature Partner Journals' Aging demonstrates that psilocin, a byproduct of consuming psilocybin, the active ingredient in psychedelic mushrooms, extended the cellular lifespan of human skin and lung cells by more than 50%. In parallel, researchers also conducted the first long-term in vivo study evaluating the systemic effects of psilocybin in aged mice of 19 months, or the equivalent of 60-65 human years. Results indicated that the mice that received an initial low dose of psilocybin of 5 mg, followed by a monthly high dose of 15 mg for 10 months, had a 30% increase in survival compared to mice that did not receive any. These mice also displayed healthier physical features, such as improved fur quality, fewer white hairs and hair regrowth. While traditionally researched for its mental health benefits, this study suggests that psilocybin impacts multiple hallmarks of aging by reducing oxidative stress, improving DNA repair responses, and preserving telomere length. Telomeres are the structured ends of a chromosome, protecting it from damage that could lead to the formation of age-related diseases, such as cancer, neurodegeneration, or cardiovascular disease. These foundational processes influence human aging and the onset of these chronic diseases. The study concludes that psilocybin may have the potential to revolutionize anti-aging therapies and could be an impactful intervention in an aging population. Read more of this story at Slashdot.
Senator Calls Out Texas For Trying To Steal Shuttle From Smithsonian
science - Posted On:2025-07-11 03:15:00 Source: slashdot
Senator Dick Durbin questioned a Texas-led effort to move Space Shuttle Discovery from the Smithsonian to Space Center Houston, describing it as an expensive "heist" costing an estimated $305 million, not the $85 million initially budgeted. "This is not a transfer. It's a heist," said Durbin during a budget markup hearing before the Senate Appropriations Committee. "A heist by Texas because they lost a competition 12 years ago." In April, Texas Senators John Cornyn and Ted Cruz introduced legislation to move the Space Shuttle Discovery from Virginia to Houston, which ultimately passed into law on July 4 as part of the "One Big Beautiful Bill." Ars Technica reports: "In the reconciliation bill, Texas entered $85 million to move the space shuttle from the National Air and Space Museum in Chantilly, Virginia, to Texas. Eighty-five million dollars sounds like a lot of money, but it is not nearly what's necessary for this to be accomplished," Durbin said. Citing research by NASA and the Smithsonian, Durbin said that the total was closer to $305 million and that did not include the estimated $178 million needed to build a facility to house and display Discovery once in Houston. Furthermore, it was unclear if Congress even has the right to remove an artifact, let alone a space shuttle, from the Smithsonian's collection. The Washington, DC, institution, which serves as a trust instrumentality of the US, maintains that it owns Discovery. The paperwork signed by NASA in 2012 transferred "all rights, interest, title, and ownership" for the spacecraft to the Smithsonian. "This will be the first time ever in the history of the Smithsonian someone has taken one of their displays and forcibly taken possession of it. What are we doing here? They don't have the right in Texas to claim this," said Durbin. [...] To be able to bring up his points at Thursday's hearing, Durbin introduced the "Houston, We Have a Problem" amendment to "prohibit the use of funds to transfer a decommissioned space shuttle from one location to another location." He then withdrew the amendment after having voiced his objections. "I think we're dealing with something called waste. Eighty-five million dollars worth of waste. I know that this is a controversial issue, and I know that there are other agencies, Smithsonian, NASA, and others that are interested in this issue; I'm going to withdraw this amendment, but I'm going to ask my colleagues be honest about it," said Durbin. "I hope that we think about this long and hard." "I am glad to see this pass as part of the Senate's One Big Beautiful Bill and look forward to welcoming Discovery to Houston and righting this egregious wrong," Cornyn said in a statement. "Houston has long been the cornerstone of our nation's human space exploration program, and it's long overdue for Space City to receive the recognition it deserves by bringing Space Shuttle Discovery home." Read more of this story at Slashdot.
Ars Live recap: Climate science in a rapidly changing world
Science - Posted On:2025-07-10 13:45:01 Source: arstechnica
In late June, we hosted this year's second Ars Live event, a conversation with climate scientist Zeke Hausfather, who holds positions with the financial services company Stripe and at the Berkeley Earth Project, which tracks the global surface temperatures. We wanted to get his perspective on why those temperatures have been setting extreme records with regularity of late, but we took a little detour on the way, asking how he ended up doing climate science in the first place.
It turned out to be a very indirect route. He'd been a climate activist during his college years and helped launch a couple of cleantech startups afterward. At the time, some of the first academic climate bloggers were getting started, and Hausfather found himself doing small projects with them. Over time, he decided "my hobby was more fun than my day job," so he decided to take time off from the business world and get a PhD in climate science. From there, he has kept his feet in both the climate and business worlds.
The conversation then moved to the record we have of the Earth's surface temperatures and the role of Berkeley Earth in providing an alternate method of calculating those. While the temperature records were somewhat controversial in the past, those arguments have largely settled down, and Berkeley Earth played a major role in helping to show that the temperature records have been reliable.
Senators Signal They're Prepared To Push Back Against NASA Cuts
science - Posted On:2025-07-10 12:15:01 Source: slashdot
Senators from both parties are preparing to challenge the Trump administration's proposed 24% cut to NASA's budget, with the Senate appropriations committee advancing a $24.9 billion allocation that matches the agency's 2025 funding levels. The bipartisan pushback directly contradicts President Donald Trump's budget request, which sought to slash NASA's science portfolio funding nearly in half and terminate dozens of operating and planned missions. "We rejected cuts that would have devastated NASA science by 47% and would have terminated 55 operating and planned missions," Senator Chris Van Hollen, a Democrat from Maryland, said. The Senate bill allocates $7.3 billion for science programs. Senators also refused the administration's call to cancel the Space Launch System rocket and Orion crew capsule after their third flights, programs Trump's budget labeled "grossly expensive and delayed." "The bill reflects an ambitious approach to space exploration, prioritizing the agency's flagship program, Artemis, and rejecting premature termination of systems like SLS and Orion before commercial replacements are ready," said Senator Jerry Moran, a Kansas Republican. Read more of this story at Slashdot.
Millions of Tonnes of Nanoplastics Are Polluting the Ocean
science - Posted On:2025-07-10 10:15:00 Source: slashdot
Researchers have discovered 27 million tonnes of nanoplastics distributed across just the top layer of the temperate to subtropical North Atlantic Ocean, according to a study published in Nature. The team sampled water at three depths across 12 locations during a November 2020 research cruise, finding average concentrations of 18 milligrams per cubic meter of three plastic types: polyethylene terephthalate, polystyrene and polyvinylchloride. These particles, smaller than one micrometer in diameter, behave differently from larger microplastics by remaining suspended throughout the water column rather than settling to the ocean floor. The nanoplastics can pass through cell walls and enter the marine food web through phytoplankton, said Tony Walker, an environmental scientist at Dalhousie University. The world's oceans contain an estimated 3 million tonnes of floating plastic pollution when excluding nanoplastics. Read more of this story at Slashdot.
“Things we’ll never know” science fair highlights US’s canceled research
Science - Posted On:2025-07-09 18:15:01 Source: arstechnica
Washington, DC—From a distance, the gathering looked like a standard poster session at an academic conference, with researchers standing next to large displays of the work they were doing. Except in this case, it was taking place in the Rayburn House Office Building on Capitol Hill, and the researchers were describing work that they weren’t doing. Called "The things we’ll never know," the event was meant to highlight the work of researchers whose grants had been canceled by the Trump administration.
A lot of court cases have been dealing with these cancellations as a group, highlighting the lack of scientific—or seemingly rational—input into the decisions to cut funding for entire categories of research. Here, there was a much tighter focus on the individual pieces of research that had become casualties in that larger fight.
Seeing even a small sampling of the individual grants that have been terminated provides a much better perspective on the sort of damage that is being done to the US public by these cuts and the utter mindlessness of the process that's causing that damage.
Animal Diseases Leapt To Humans When We Started Keeping Livestock
science - Posted On:2025-07-09 13:00:00 Source: slashdot
Researchers analyzing DNA from 1,313 ancient humans across Eurasia found that zoonotic pathogens first appeared in human populations around 6,500 years ago, coinciding with the transition from hunter-gatherer societies to livestock farming. The genomic study, published in Nature, identified 5,486 DNA sequences from bacteria, viruses and parasites in blood remnants from bones and teeth spanning 37,000 years. Zoonotic pathogens were detected only in remains 6,500 years old or younger, peaking around 5,000 years ago when pastoralist communities from the Steppe region migrated into Europe with large herds. The plague bacterium Yersinia pestis first appears in the dataset between 5,700-5,300 years ago. Read more of this story at Slashdot.
Sizing up the 5 companies selected for Europe’s launcher challenge
Science - Posted On:2025-07-09 09:45:01 Source: arstechnica
The European Space Agency has selected five launch startups to become eligible for up to 169 million euros ($198 million) in funding to develop alternatives to Arianespace, the continent's incumbent launch service provider.
The five companies ESA selected are Isar Aerospace, MaiaSpace, Rocket Factory Augsburg, PLD Space, and Orbex. Only one of these companies, Isar Aerospace, has attempted to launch a rocket into orbit. Isar's Spectrum rocket failed moments after liftoff from Norway on a test flight in March.
None of these companies are guaranteed ESA contracts or funding. Over the next several months, the European Space Agency and the five launch companies will negotiate with European governments for funding leading up to ESA's ministerial council meeting in November, when ESA member states will set the agency's budget for at least the next two years. Only then will ESA be ready to sign binding agreements.
Record-Setting Dark Matter Detector Comes Up Empty -- and That's Good News
science - Posted On:2025-07-09 09:15:00 Source: slashdot
An anonymous reader quotes a report from Gizmodo: WIMPs (weakly interacting massive particles) are one of the most serious contenders for dark matter -- the "missing" mass supposedly constituting 85% of our universe. Given its elusiveness, dark matter tests the patience and creativity of physicists. But the latest results from LUX-ZEPLIN (LZ), the South Dakota-based detector, may have brought scientists a small step closer to catching WIMPs in action. In a recent Physical Review Letters paper, scientists analyzed 280 days' worth of data from LUX-ZEPLIN, reporting the tightest ever upper limit on the interaction strength of WIMPs. The result -- a near fivefold improvement -- demonstrates how physicists are increasingly getting better at circumventing the problem that dark matter is, well, dark; the elusive stuff evades any detection method that depends on materials interacting with visible light or other types of radiation. The LUX-ZEPLIN experiment, located one mile underground in a decommissioned South Dakota gold mine, employs nearly 15,000 pounds (7 tons) of liquid xenon. The chemical element's high atomic mass and density make it potentially easier for scientists to detect any unknown particles that may pass through the detector. Also, liquid xenon is transparent, preventing any unwanted noise -- usually arising from radioactive matter around the detector -- from spoiling an experiment. "These results firmly establish that LZ is the world's most sensitive search for dark matter heavier than 10 GeV, that's about 10 times heavier than a proton," explained Scott Haselschwart, a physicist at the University of Michigan and LZ physics coordinator, in an email to Gizmodo. "To put our result in perspective: we have ruled out dark matter that would interact only once in a single kilogram of xenon every four millennia!" "LZ is the most sensitive search for WIMP dark matter to date, but we still have another two years of data to collect," Haselschwart said. "This means that a discovery of dark matter in LZ could come anytime now. We are truly looking for dark matter where no one has ever looked before and that is extremely exciting!" Read more of this story at Slashdot.
Wildfires are challenging air quality monitoring infrastructure
Science - Posted On:2025-07-09 08:30:00 Source: arstechnica
Ten years ago, Tracey Holloway, an atmospheric scientist at the University of Wisconsin–Madison, would have said that air pollution in the United States was a huge success story. “Our air had been getting cleaner and cleaner almost everywhere, for almost every pollutant,” she said. But in June 2023, as wildfire smoke from Canada spread, the air quality dropped to historically low levels in her home state of Wisconsin.
Just last month, the region’s air quality dipped once more to unhealthy levels. Again, wildfires were to blame.
While the US has made significant strides in curbing car and industrial pollution through setting emission limits on industrial facilities and automakers, the increasing frequency and intensity of fires are “erasing the gains that we have obtained through this pollutant control effort,” said Nga Lee “Sally” Ng, an aerosol researcher at Georgia Institute of Technology.
Peter Jackson Backs Long Shot De-Extinction Plan, Starring New Zealand's Lost Moa
science - Posted On:2025-07-08 23:45:01 Source: slashdot
An anonymous reader quotes a report from the Associated Press: Filmmaker Peter Jackson owns one of the largest private collections of bones of an extinct New Zealand bird called the moa. His fascination with the flightless ostrich-like bird has led to an unusual partnership with a biotech company known for its grand and controversial plans to bring back lost species. On Tuesday, Colossal Biosciences announced an effort to genetically engineer living birds to resemble the extinct South Island giant moa -- which once stood 12 feet (3.6 meters) tall -- with $15 million in funding from Jackson and his partner Fran Walsh. The collaboration also includes the New Zealand-based Ngai Tahu Research Centre. "The movies are my day job, and the moa are my fun thing I do," said Jackson. "Every New Zealand schoolchild has a fascination with the moa." The moa had roamed New Zealand for 4,000 years until they became extinct around 600 years ago, mainly because of overhunting. A large skeleton brought to England in the 19th century, now on display at the Yorkshire Museum, prompted international interest in the long-necked bird. Unlike Colossal's work with dire wolves, the moa project is in very early stages. It started with a phone call about two years ago after Jackson heard about the company's efforts to "de-extinct" -- or create genetically similar animals to -- species like the woolly mammoth and the dire wolf. Then Jackson put Colossal in touch with experts he'd met through his own moa bone-collecting. At that point, he'd amassed between 300 and 400 bones, he said. In New Zealand, it's legal to buy and sell moa bones found on private lands, but not on public conservation areas -- nor to export them. The first stage of the moa project will be to identify well-preserved bones from which it may be possible to extract DNA, said Colossal's chief scientist Beth Shapiro. Those DNA sequences will be compared to genomes of living bird species, including the ground-dwelling tinamou and emu, "to figure out what it is that made the moa unique compared to other birds," she said. [...] The direction of the project will be shaped by Mori scholars at the University of Canterbury's Ngi Tahu Research Centre. Ngi Tahu archaeologist Kyle Davis, an expert in moa bones, said the work has "really reinvigorated the interest in examining our own traditions and mythology." Read more of this story at Slashdot.
Hybrid Model Reveals People Act Less Rationally In Complex Games, More Predictably In Simple Ones
science - Posted On:2025-07-08 21:30:00 Source: slashdot
alternative_right shares a report from Phys.org: Researchers at Princeton University, Boston University and other institutes used machine learning to predict the strategic decisions of humans in various games. Their paper, published in Nature Human Behavior, shows that a deep neural network trained on human decisions could predict the strategic choices of players with high levels of accuracy. [...] Essentially, the team suggests that people behave more rationally while playing games that they perceive as easier. In contrast, when they are playing more complex games, people's choices could be influenced by various other factors, thus the "noise" affecting their behavior would increase. As part of their future studies, the researchers would also like to shed more light on what makes a game "complex" or "easy." This could be achieved using the context-dependent noise parameter that they integrated into their model as a signature of "perceived difficulty." "Our analysis provides a robust model comparison across a wide range of candidate models of decision-making," said [Jian-Qiao Zhu, first author of the paper]. "We now have strong evidence that introducing context-dependence into the quantal response model significantly improves its ability to capture human strategic behavior. More specifically, we identified key factors in the game matrix that shape game complexity: considerations of efficiency, the arithmetic difficulty of computing payoff differences, and the depth of reasoning required to arrive at a rational solution." The findings gathered as part of this recent study also highlight the "lightness" with which many people approach strategic decisions, which could make them vulnerable to parties looking to sway them towards making irrational decisions. Once they gather more insight into what factors make games and decision-making scenarios more challenging for people, Zhu and his colleagues hope to start devising new behavioral science interventions aimed at prompting people to make more rational decisions. Read more of this story at Slashdot.
Watch this cucumber squirt out its seeds at ballistic speeds
Science - Posted On:2025-07-08 15:00:00 Source: arstechnica
One doesn't normally associate ballistics with botany, but most of us don't study "squirting" cucumbers—so called because they disperse their seeds by explosively propelling them out into the world. Scientists took a series of high-speed videos, both in the wild and in the lab, to learn more about the underlying biomechanics of this plant's method of seed dispersal. Graduate student Helen Gorges of Kiel University's Zoological Institute in Germany presented the findings at the Society for Experimental Biology Annual Conference in Antwerp, Belgium.
Also known as the "noli me tangere," aka "touch me not," the squirting cucumber (Ecballium elaterium) is often considered a weed or invasive species, although in some regions it's viewed as ornamental. Fun fact: The fruit extract is a powerful laxative. If swallowed or inhaled through the nose, it can be poisonous, causing edemas and necrosis of the nasal mucosa, among other complications. That same fruit, once ripened, can squirt out a stream of mucus-like liquid containing seed pods at high speeds—an example of rapid plant movement.
As glucosides in the sap of the fruit's tissue cells build up, so does the internal pressure, eventually causing the fruit to detach from the stalk. At that point, the pericarp contracts, and both the fruit and the seeds are violently expelled through the resulting hole. The squirting action is further aided by structural changes in the fruit as it dehydrates and its cells coil, bend, or twist in response (hygroscopic movement).
Weedkiller Ingredient Widely Used In US Can Damage Organs and Gut Bacteria, Research Shows
science - Posted On:2025-07-08 09:15:00 Source: slashdot
An anonymous reader quotes a report from The Guardian: The herbicide ingredient used to replace glyphosate in Roundup and other weedkiller products can kill gut bacteria and damage organs in multiple ways, new research shows. The ingredient, diquat, is widely employed in the US as a weedkiller in vineyards and orchards, and is increasingly sprayed elsewhere as the use of controversial herbicide substances such as glyphosate and paraquat drops in the US. But the new piece of data suggests diquat is more toxic than glyphosate, and the substance is banned over its risks in the UK, EU, China and many other countries. Still, the EPA has resisted calls for a ban, and Roundup formulas with the ingredient hit the shelves last year. [...] Diquat is also thought to be a neurotoxin, carcinogen and linked to Parkinson's disease. An October analysis of EPA data by the Friends of the Earth non-profit found it is about 200 times more toxic than glyphosate in terms of chronic exposure. [...] The new review of scientific literature in part focuses on the multiple ways in which diquat damages organs and gut bacteria, including by reducing the level of proteins that are key pieces of the gut lining. The weakening can allow toxins and pathogens to move from the stomach into the bloodstream, and trigger inflammation in the intestines and throughout the body. Meanwhile, diquat can inhibit the production of beneficial bacteria that maintain the gut lining. Damage to the lining also inhibits the absorption of nutrients and energy metabolism, the authors said. The research further scrutinizes how the substance harms the kidneys, lungs and liver. Diquat "causes irreversible structural and functional damage to the kidneys" because it can destroy kidney cells' membranes and interfere with cell signals. The effects on the liver are similar, and the ingredient causes the production of proteins that inflame the organ. Meanwhile, it seems to attack the lungs by triggering inflammation that damages the organ's tissue. More broadly, the inflammation caused by diquat may cause multiple organ dysfunction syndrome, a scenario in which organ systems begin to fail. The authors note that many of the studies are on rodents and more research on low, long-term exposure is needed. The report notes that the EPA is not reviewing the chemical, "and even non-profits that push for tighter pesticide regulations have largely focused their attention elsewhere." "[T]hat was in part because U.S. pesticide regulations are so weak that advocates are tied up with battles over ingredients like glyphosate, paraquat and chlorpyrifos -- substances that are banned elsewhere but still widely used here. Diquat is 'overshadowed' by those ingredients." Read more of this story at Slashdot.