fahrbot-bot shares a report from Phys.Org: Researchers from Tokyo Metropolitan University have discovered a way to make self-assembled nanowires of transition metal chalcogenides at scale using chemical vapor deposition. By changing the substrate where the wires form, they can tune how these wires are arranged, from aligned configurations of atomically thin sheets to random networks of bundles. This paves the way to industrial deployment in next-gen industrial electronics, including energy harvesting, and transparent, efficient, even flexible devices. Using a process called chemical vapor deposition (CVD), they found that they could assemble TMC nanowires in different arrangements depending on the surface or substrate that they use as a template. Examples are shown in Figure 2; in (a), nanowires grown on a silicon/silica substrate form a random network of bundles; in (b), the wires assemble in a set direction on a sapphire substrate, following the structure of the underlying sapphire crystal. By simply changing where they are grown, the team now have access to centimeter-sized wafers covered in the arrangement they desired, including monolayers, bilayers and networks of bundles, all with different applications. They also found that the structure of the wires themselves were highly crystalline and ordered, and that their properties, including their excellent conductivity and 1D-like behavior, matched those found in theoretical predictions. The research has been published in the journal Nano Letters.

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Microplastic particles have been revealed in the placentas of unborn babies for the first time, which the researchers said was "a matter of great concern." From a report: The health impact of microplastics in the body is as yet unknown. But the scientists said they could carry chemicals that could cause long-term damage or upset the foetus's developing immune system. The particles are likely to have been consumed or breathed in by the mothers. The particles were found in the placentas from four healthy women who had normal pregnancies and births. Microplastics were detected on both the foetal and maternal sides of the placenta and in the membrane within which the foetus develops. A dozen plastic particles were found. Only about 4% of each placenta was analysed, however, suggesting the total number of microplastics was much higher. All the particles analysed were plastics that had been dyed blue, red, orange or pink and may have originally come from packaging, paints or cosmetics and personal care products. The microplastics were mostly 10 microns in size (0.01mm), meaning they are small enough to be carried in the bloodstream. The particles may have entered the babies' bodies, but the researchers were unable to assess this.

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An anonymous reader shares a report: Some diamonds were formed billions of years ago in space as the carbon-rich atmospheres of dying stars expanded and cooled. In our own planet's lifetime, high-temperatures and pressures in the mantle produced the diamonds that are familiar to us as gems. 5,000 years ago, a large meteorite that struck a carbon-rich sediment on Earth produced an impact diamond. Each of these diamonds differs from the others in both composition and genesis, but all are categorized as "diamond" by the authoritative guide to minerals -- the International Mineralogical Association's Commission on New Minerals, Nomenclature and Classification. For many physical scientists, this inconsistency poses no problem. But the IMA system leaves unanswered questions for planetary scientists, geobiologists, paleontologists and others who strive to understand minerals' historical context. So, Carnegie's Robert Hazen and Shaunna Morrison teamed up with CU Boulder philosophy of science professor Carol Cleland to propose that scientists address this shortcoming with a new "evolutionary system" of mineral classification -- one that includes historical data and reflects changes in the diversity and distribution of minerals through more than 4 billion years of Earth's history. Their work is published by the Proceedings of the National Academy of Sciences. "We came together from the very different fields of philosophy and planetary science to see if there was a rigorous way to bring the dimension of time into discussions about the solid materials that compose Earth," Hazen said.

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fahrbot-bot quotes an article from Science Alert: Nothing keeps time like the beating heart of an atom. But even the crisp tick-tock of a vibrating nucleus is limited by uncertainties imposed by the laws of quantum mechanics. Several years ago, researchers from MIT and the University of Belgrade in Serbia proposed that quantum entanglement could push clocks beyond this blurry boundary. Now, we have a proof of concept in the form of an experiment. Physicists connected together a cloud of ytterbium-171 atoms with streams of photons reflected from a surrounding hall of mirrors and measured the timing of their tiny wiggles. Their results show that entangling atoms in this way could speed up the time-measuring process of atomic nuclei clocks, making them more precise than ever. In principle, a clock based on this new approach would lose just 100 milliseconds since the dawn of time itself.

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An anonymous reader quotes a report from The Conversation: When wildfires swept through the hills near Santa Cruz, California, in 2020, they released toxic chemicals into the water supplies of at least two communities. One sample found benzene, a carcinogen, at 40 times the state's drinking water standard. Our testing has now confirmed a source of these chemicals, and it's clear that wildfires aren't the only blazes that put drinking water systems at risk. In a new study, we heated plastic water pipes commonly used in buildings and water systems to test how they would respond to nearby fires. The results, released Dec. 14, show how easily wildfires could trigger widespread drinking water contamination. They also show the risks when only part of a building catches fire and the rest remains in use. In some of our tests, heat exposure caused more than 100 chemicals to leach from the damaged plastics. To determine if plastic pipes could be responsible for drinking water contamination after wildfires, we exposed commonly available plastic pipes to heat. The temperatures were similar to the heat from a wildfire that radiates toward buildings but isn't enough to cause the pipes to catch fire. We tested several popular plastic drinking water pipes, including high-density polyethylene (HDPE), crosslinked polyethylene (PEX), polyvinyl chloride (PVC) and chlorinated polyvinylchloride (CPVC). Benzene and other chemicals were generated inside the plastic pipes just by heating. After the plastics cooled, these chemicals then leached into the water. It happened at temperatures as low as 392 degrees Fahrenheit. Fires can exceed 1,400 degrees. While researchers previously discovered that plastics could release benzene and other chemicals into the air during heating, this new study shows heat-damaged plastics can directly leach dozens of toxic chemicals into water. What can be done about the contamination? The report says a community can stop water contamination if they can quickly isolate the damaged pipes. Rinsing heat-damaged pipes can also work, but some plastic pipes require more than 100 days of nonstop water rinsing to be safe to use. If that's the case, the pipes may need to be replaced instead. "Water companies can install network isolation valves and backflow prevention devices, to prevent contaminated water moving from a damaged building into the utility pipe network," the report adds. "Insurance companies can use pricing to encourage property owners and cities to install fire-resistant metal pipes instead of plastic. Rules for keeping vegetation away from meter boxes and buildings can also lessen the chance heat reaches plastic water system components."

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The Food and Drug Administration has approved genetically engineered pigs for use in food and medical products. The pigs, developed by medical company Revivicor, could be used in the production of drugs, to provide organs and tissues for transplants, and to produce meat that's safe to eat for people with meat allergies. From a report: "Today's first-ever approval of an animal biotechnology product for both food and as a potential source for biomedical use represents a tremendous milestone for scientific innovation," said FDA Commissioner Stephen M. Hahn in a press release. The pigs are called GalSafe pigs because they lack a molecule called alpha-gal sugar, which can trigger allergic reactions. Alpha-gal sugar is found in many mammals, but not usually in humans. Alpha-gal syndrome (AGS), which causes a serious meat allergy, can happen after a bite from a lone star or deer tick. Though it hasn't been tested specifically for people with AGS yet, the FDA has determined GalSafe pork products are safe for the general population to eat. In addition to their potential for safer consumption, there are several potential medical uses for GalSafe pigs. They could be used to make drugs like heparin, a common blood-thinner derived from animal tissue, safer for people with AGS.

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The European Organization for Nuclear Research (CERN) will open up access to more data from Large Hadron Collider (LHC) experiments. Under an updated policy, data will be released around five years after it's collected and CERN hopes to release the full dataset publicly "by the close of the experiment concerned." Core LHC collaborators ALICE, ATLAS, CMS and LHCb all endorsed the move. From a report: CERN will make level 3 data available, which will allow anyone to conduct "high-quality analysis" on information obtained from Large Hadron Collider experiments. Level 3 relates to "calibrated reconstructed data with the level of detail useful for algorithmic, performance and physics studies," according to CERN. The organization won't release raw data, however. The open data policy states that it's "not practically possible to make the full raw dataset from the LHC experiments usable in a meaningful way outside its collaborations." That's because of the complexity of the data, software and metadata and access issues to the vast troves of stored information, among other factors. LHC collaborators don't have general access to the raw data either. Instead, the assembly of level 3 data "is performed centrally."

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An anonymous reader quotes a report from Phys.Org: Researchers have found a way to protect highly fragile quantum systems from noise, which could aid in the design and development of new quantum devices, such as ultra-powerful quantum computers. The researchers, from the University of Cambridge, have shown that microscopic particles can remain intrinsically linked, or entangled, over long distances even if there are random disruptions between them. Using the mathematics of quantum theory, they discovered a simple setup where entangled particles can be prepared and stabilized even in the presence of noise by taking advantage of a previously unknown symmetry in quantum systems. Their results, reported in the journal Physical Review Letters, open a new window into the mysterious quantum world that could revolutionize future technology by preserving quantum effects in noisy environments, which is the single biggest hurdle for developing such technology. Harnessing this capability will be at the heart of ultrafast quantum computers. [...] Now, Dutta and his co-author Professor Nigel Cooper have discovered a robust quantum system where multiple pairs of qubits remain entangled even with a lot of noise. They modeled an atomic system in a lattice formation, where atoms strongly interact with each other, hopping from one site of the lattice to another. The authors found if noise were added in the middle of the lattice, it didn't affect entangled particles between left and right sides. This surprising feature results from a special type of symmetry that conserves the number of such entangled pairs. They showed this hidden symmetry protects the entangled pairs and allows their number to be controlled from zero to a large maximum value. Similar conclusions can be applied to a broad class of physical systems and can be realized with already existing ingredients in experimental platforms, paving the way to controllable entanglement in a noisy environment. The researchers are hoping to confirm their theoretical findings with experiments within the next year.

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Patterns of missing credit card and loan payments could be an early indicator of dementia years before diagnosis, a new study says. From a report: The study, published Monday in the medical journal JAMA, looked at Medicare patients living alone across the United States and analyzed their credit data and payments over time. Researchers found that patients with Alzheimer's disease and related dementia were more likely to miss payments up to six years before getting diagnosed, the study said. And, those poor financial actions led them to subprime credit scores two and a half years before diagnosis, as opposed to the patients without dementia. "I think we were a little surprised that it was so common that we could really see it in the data," lead author Lauren Hersch Nicholas told CNN. "Doctors colloquially say that you should look for dementia in the checkbook, but I don't think we had any sense of for how many years in advance these effects could be happening." Nicholas is an associate professor at Johns Hopkins University. Researchers from Johns Hopkins and the Federal Reserve Board of Governors led the study. Alzheimer's dementia affects about 5.8 million Americans who are 65 and older, according to the Alzheimer's Association. The number of Americans with the disease is projected to hit 13.8 million by 2050, the non-profit said.

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An anonymous reader quotes a report from Popular Mechanics: Scientists are going back to the salt mines, literally, to find a revolutionary new way to store large quantities of hydrogen for energy. Proponents say this could be a step toward unlocking hydrogen for renewables -- something that could change the energy landscape if it were resolved. "The project would initially have enough energy to power 150,000 households for one year and is scheduled to be operational by 2025," Fuel Cell Works reports. "It is being managed by Mitsubishi Hitachi Power Systems (MHPS), a maker of gas turbines, and Magnum Development, which owns salt caverns for liquid fuel storage." This works by basically repurposing existing, enormous caves to store reserves of hydrogen as well as other fuels. Salt in particular makes a great medium for storing and then continuing to generate green hydrogen. CNBC explains how the caves are used to store and generate hydrogen: "Caverns can be created in salt domes by drilling into the salt dome and injecting the rock with water, which dissolves the salt. The resulting brine is extracted, leaving a large cavity. The next step is storing hydrogen in the cavern. Hydrogen electrolyzers can convert water into hydrogen by using renewable energy from solar and other sources. The hydrogen can then be stored, and reconverted to electricity when needed." Fuel Cell Works reports that while these caves are in the U.S., the major push for salt cave storage is in Europe.

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The World Health Organization's top emergency expert said on Friday it would be "highly speculative" for the WHO to say the coronavirus did not emerge in China, where it was first identified in a food market in December last year. From a report: China is pushing a narrative via state media that the virus existed abroad before it was discovered in the central city of Wuhan, citing the presence of coronavirus on imported frozen food packaging and scientific papers claiming it had been circulating in Europe last year. "I think it's highly speculative for us to say that the disease did not emerge in China," Mike Ryan said at a virtual briefing in Geneva after being asked if COVID-19 could have first emerged outside China. "It is clear from a public health perspective that you start your investigations where the human cases first emerged," he added, saying that evidence might then lead to other places.

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Leaf-cutter ants are named for their Herculean feats: they chomp foliage and carry unwieldy pieces, like green flags many times their size, long distances to their colonies. There they chew up the leaves to feed underground fungus farms. Along the way, the insects brave all manner of predators -- and regularly engage in wars with other ants. But these insects are even tougher than previously thought. From a report: A new study shows that one Central American leaf-cutter ant species has natural armor that covers its exoskeleton. This shield-like coating is made of calcite with high levels of magnesium, a type found only in one other biological structure: sea urchin teeth, which can grind limestone. Bones and teeth of many animals contain calciferous minerals, and crustaceans, such as crabs and lobsters, have mineralized shells and other body parts. But before this finding, no type of calcite had been found in any adult insect. In leaf-cutter ants, this coating is made of thousands of tiny, plate-like crystals that harden their exoskeleton. This "armor" helps prevent the insects from losing limbs in battles with other ants and staves off fungal infections, according to a paper published November 24 in the journal Nature Communications. The discovery is especially surprising because the ants are well known. "There are thousands of papers on leaf-cutter ants," says study co-author Cameron Currie, an evolutionary biologist at the University of Wisconsin-Madison. "We were really excited to find [this in] one of the most well-studied insects in nature," he says. Though this paper looked only at one species, Acromyrmex echinatior, Currie and colleagues suspect other related ants have the biomineral too.

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Dead mink are rising from their graves in Denmark after a rushed cull over fears of a coronavirus mutation led to thousands being slaughtered and buried in shallow pits -- from which some are now emerging. From a report: "As the bodies decay, gases can be formed," Thomas Kristensen, a national police spokesman, told the state broadcaster DR. "This causes the whole thing to expand a little. In this way, in the worst cases, the mink get pushed out of the ground." Police in West Jutland, where several thousand mink were buried in a mass grave on a military training field, have tried to counter the macabre phenomenon by shovelling extra soil on top of the corpses, which are in a 1 metre-deep trench. "This is a natural process," Kristensen said. "Unfortunately, one metre of soil is not just one metre of soil -- it depends on what type of soil it is. The problem is that the sandy soil in West Jutland is too light. So we have had to lay more soil on top." Adding to the popular concern, local media reported that the animals may also have been buried too close to lakes and underground water reserves, prompting fears of possible contamination of ground and drinking water supplies.

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This 2004 project, which is an infinite loading wallpaper, is garnering interest from users on social media this week who have found it for the first time. You might also like Zoomquilt2, from 2007, and Arkadia, from 2015.

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Iwastheone shares a report from Science Magazine: In October 2010, in a building the size of three U.S. football fields, researchers at the Lawrence Livermore National Laboratory powered up 192 laser beams, focused their energy into a pulse with the punch of a speeding truck, and fired it at a pellet of nuclear fuel the size of a peppercorn. So began a campaign by the National Ignition Facility (NIF) to achieve the goal it is named for: igniting a fusion reaction that produces more energy than the laser puts in. A decade and nearly 3000 shots later, NIF is still generating more fizz than bang, hampered by the complex, poorly understood behavior of the laser targets when they vaporize and implode. But with new target designs and laser pulse shapes, along with better tools to monitor the miniature explosions, NIF researchers believe they are close to an important intermediate milestone known as "burning plasma": a fusion burn sustained by the heat of the reaction itself rather than the input of laser energy. Self-heating is key to burning up all the fuel and getting runaway energy gain. Once NIF reaches the threshold, simulations suggest it will have an easier path to ignition, says Mark Herrmann, who oversees Livermore's fusion program. "We're pushing as hard as we can," he says. "You can feel the acceleration in our understanding." Outsiders are impressed, too. "You kind of feel there's steady progress and less guesswork," says Steven Rose, co-director of the Centre for Inertial Fusion Studies at Imperial College London. "They're moving away from designs traditionally held and trying new things." NIF may not have the luxury of time, however. The proportion of NIF shots devoted to the ignition effort has been cut from a high of nearly 60% in 2012 to less than 30% today to reserve more shots for stockpile stewardship -- experiments that simulate nuclear detonations to help verify the reliability of warheads. Presidential budget requests in recent years have repeatedly sought to slash research into inertial confinement fusion at NIF and elsewhere, only to have Congress preserve it. NIF's funder, the National Nuclear Security Administration (NNSA), is reviewing the machine's progress for the first time in 5 years. Under pressure to modernize the nuclear arsenal, the agency could decide on a further shift toward stockpile stewardship. "Will the ignition program be squeezed out?" asks Mike Dunne, who directed Livermore's fusion energy efforts from 2010 to 2014. "The jury's out."

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"Does the human brain resemble the Universe?" teases an announcement that an astrophysicist of the University of Bologna and a neurosurgeon of the University of Verona "compared the network of neuronal cells in the human brain with the cosmic network of galaxies...and surprising similarities emerged." Slashdot reader Iwastheone shares their report: Despite the substantial difference in scale between the two networks (more than 27 orders of magnitude), their quantitative analysis, which sits at the crossroads of cosmology and neurosurgery, suggests that diverse physical processes can build structures characterized by similar levels of complexity and self-organization. The human brain functions thanks to its wide neuronal network that is deemed to contain approximately 69 billion neurons. On the other hand, the observable universe can count upon a cosmic web of at least 100 billion galaxies. Within both systems, only 30% of their masses are composed of galaxies and neurons. Within both systems, galaxies and neurons arrange themselves in long filaments or nodes between the filaments. Finally, within both system, 70% of the distribution of mass or energy is composed of components playing an apparently passive role: water in the brain and dark energy in the observable Universe. Starting from the shared features of the two systems, researchers compared a simulation of the network of galaxies to sections of the cerebral cortex and the cerebellum. The goal was to observe how matter fluctuations scatter over such diverse scales. "We calculated the spectral density of both systems. This is a technique often employed in cosmology for studying the spatial distribution of galaxies", explains Franco Vazza (astrophysicist at the University of Bologna). "Our analysis showed that the distribution of the fluctuation within the cerebellum neuronal network on a scale from 1 micrometre to 0.1 millimetres follows the same progression of the distribution of matter in the cosmic web but, of course, on a larger scale that goes from 5 million to 500 million light-years". The two researchers also calculated some parameters characterising both the neuronal network and the cosmic web: the average number of connections in each node and the tendency of clustering several connections in relevant central nodes within the network. "Once again, structural parameters have identified unexpected agreement levels. Probably, the connectivity within the two networks evolves following similar physical principles, despite the striking and obvious difference between the physical powers regulating galaxies and neurons", adds Alberto Feletti (neurosurgeon at the University of Verona).

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sciencehabit shares a report from Science Magazine: In 2018, a group of researchers at the Massachusetts Institute of Technology (MIT) pulled off a dazzling materials science magic trick. They stacked two microscopic cards of graphene -- sheets of carbon one atom thick -- and twisted one ever so slightly. Applying an electric field transformed the stack from a conductor to an insulator and then, suddenly, into a superconductor: a material that frictionlessly conducts electricity. Dozens of labs leapt into the newly born field of "twistronics," hoping to conjure up novel electronic devices without the hassles of fusing together chemically different materials. Two groups -- including the pioneering MIT group -- are now delivering on that promise by turning twisted graphene into working devices, including superconducting switches like those used in many quantum computers. The studies mark a crucial step for the material, which is already maturing into a basic science tool able to capture and control individual electrons and photons. Now, it is showing that it could one day be the basis of new electronic devices.

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Iwastheone writes: While traditional diamonds are formed over billions of years deep in the Earth where extreme pressures and temperatures provide just the right conditions to crystalize carbon, scientists are working on more expedient ways of forging the precious stones. An international team of researchers has succeeded in whittling this process down to mere minutes, demonstrating a new technique where they not only form quickly, but do so at room temperature. This latest breakthrough was led by scientists at the Australian National University (ANU) and RMIT University, who used what's known as a diamond anvil cell, which is a device used by researchers to generate the extreme pressures needed to create ultra-hard materials. The team applied pressure equal to 640 African elephants on the tip of a ballet shoe, doing so in a way that caused an unexpected reaction among the the carbon atoms in the device. "The twist in the story is how we apply the pressure," says ANU Professor Jodie Bradby. "As well as very high pressures, we allow the carbon to also experience something called 'shear' -- which is like a twisting or sliding force. We think this allows the carbon atoms to move into place and form Lonsdaleite and regular diamond." These regular diamonds are the type you might find in an engagement ring, while Lonsdaleite diamonds are rarer and found at meteorite impact sites. Using advanced electron microscopy, the team was able to examine the samples in detail, and found that the materials were formed within bands they liken to "rivers" of diamond. The team hopes the technique can enable them to produce meaningful quantities of these artificial diamonds, particularly Lonsdaleite, which is predicted to be 58 percent harder than regular diamonds. "Lonsdaleite has the potential to be used for cutting through ultra-solid materials on mining sites," Bradby says. The research was published in the journal Small, while you can hear from the researchers in this video.

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The Arecibo telescope's long and productive life has come to an end. From a report: The National Science Foundation (NSF) announced today it will decommission the iconic radio telescope in Puerto Rico following two cable breaks in recent months that have brought the structure to near collapse. The 57-year-old observatory, a survivor of numerous hurricanes and earthquakes, is now in such a fragile state that attempting repairs would put staff and workers in danger. "This decision was not an easy one to make," Sean Jones, NSF's assistant director for mathematical and physical sciences, said at a news briefing today. "We understand how much Arecibo means to [the research] community and to Puerto Rico." Ralph Gaume, director of NSF's astronomy division, said at the briefing the agency wants to preserve other instruments at the site, as well as the visitor and outreach center. But they are under threat if the telescope structure collapses. That would bring the 900-ton instrument platform, suspended 137 meters above the 305-meter-wide dish, crashing down. Flailing cables could damage other buildings on the site, as could the three support towers if they fell, too. "There is a serious risk of an unexpected and uncontrolled collapse," Gaume said. "A controlled decommissioning gives us the opportunity to preserve valuable assets that the observatory has." Over the next few weeks, engineering firms will develop a plan for a controlled dismantling. It may involve releasing the platform from its cables explosively and letting it fall.

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How long might immunity to the coronavirus last? Years, maybe even decades, according to a new study -- the most hopeful answer yet to a question that has shadowed plans for widespread vaccination. From a report: Eight months after infection, most people who have recovered still have enough immune cells to fend off the virus and prevent illness, the new data show. A slow rate of decline in the short term suggests, happily, that these cells may persist in the body for a very, very long time to come. The research, published online, has not been peer-reviewed nor published in a scientific journal. But it is the most comprehensive and long-ranging study of immune memory to the coronavirus to date. "That amount of memory would likely prevent the vast majority of people from getting hospitalized disease, severe disease, for many years," said Shane Crotty, a virologist at the La Jolla Institute of Immunology who co-led the new study. The findings are likely to come as a relief to experts worried that immunity to the virus might be short-lived, and that vaccines might have to be administered repeatedly to keep the pandemic under control. And the research squares with another recent finding: that survivors of SARS, caused by another coronavirus, still carry certain important immune cells 17 years after recovering. The findings are consistent with encouraging evidence emerging from other labs. Researchers at the University of Washington, led by the immunologist Marion Pepper, had earlier shown that certain "memory" cells that were produced following infection with the coronavirus persist for at least three months in the body. The study has yet to be published and peer-reviewed.

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