It's far from a done deal, but plans by European physicists to build a huge new gravitational wave observatory with a radical design received a boost last week. From a report: The European Strategy Forum on Research Infrastructures (ESFRI), which advises European governments on research priorities, added the $2.25 billion observatory, called the Einstein Telescope, to a road map of large science projects ripe for progress. Developers hope the move will give them the political validation needed to transform the Einstein Telescope idea into a project. "This isn't a promise of any funding, but it shows the clear intention to pursue this," says Harald Luck, a gravitational wave physicist at Leibniz University Hannover and the Max Planck Institute for Gravitational Physics and co-chair of the Einstein Telescope steering committee. âoeIt is more of a political commitment." U.S. gravitational wave physicists welcomed the announcement, too, as they think it may bolster their plans to build a pair of detectors even bigger than the Einstein Telescope in a project called Cosmic Explorer. "In the U.S., I think the momentum is going to start to build," says David Reitze, executive director of the Laser Interferometer Gravitational-Wave Observatory (LIGO) and a physicist at the California Institute of Technology.

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Endurance22 will launch early next year with aim of locating and surveying wreck in the Weddell Sea. From a report: The location of Sir Ernest Shackleton's Endurance has been one of the great maritime mysteries since the ship became trapped in ice and sank in 1915. Finding this symbol of the "heroic age" of polar exploration at the bottom of the Weddell Sea was long thought impossible because of the harshness of the Antarctic environment -- "the evil conditions," as Shackleton described them. Now a major scientific expedition, announced on Monday, is being planned with a mission to locate, survey and film the wreck. Endurance22 will launch early next year, in a vessel that will brave the most treacherous frozen waters, pounding its way through miles of pack ice. The effects of climate change will make the expedition a little less difficult, with melting ice easing the vessel's passage. An international team of scientists with expertise in the study of ice and climate will be onboard, advancing knowledge of the Antarctic environment. Mensun Bound, its director of exploration, headed the 2019 search for the Endurance that had to be called off because of extreme weather conditions, after an underwater vehicle became trapped beneath the ice. He told the Guardian: "There's a complexity of emotions all swishing around within me. On the one hand, there's great excitement. On the other, for the last three years, I've had to carry this persistent sadness in me that we didn't find it last time. It's never far from my thoughts. That ship is always teasing my imagination." Bound said global warming in the Antarctic is "absolutely devastating," but that the melting ice "has improved our chances" of discovering the shipwreck.

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An anonymous reader quotes a report from Scientific American: Behold the highest-resolution image of atoms ever seen. Cornell University researchers captured a sample from a crystal in three dimensions and magnified it 100 million times, doubling the resolution that earned the same scientists a Guinness World Record in 2018. Their work could help develop materials for designing more powerful and efficient phones, computers and other electronics, as well as longer-lasting batteries. The researchers obtained the image using a technique called electron ptychography. It involves shooting a beam of electrons, about a billion of them per second, at a target material. The beam moves infinitesimally as the electrons are fired, so they hit the sample from slightly different angles each time -- sometimes they pass through cleanly, and other times they hit atoms and bounce around inside the sample on their way out. Cornell physicist David Muller, whose team conducted the recent study, likens the technique to playing dodgeball against opponents who are standing in the dark. The dodgeballs are electrons, and the targets are individual atoms. Though Muller cannot see the targets, he can see where the "dodgeballs" end up, thanks to advanced detectors. Based on the speckle pattern generated by billions of electrons, machine-learning algorithms can calculate where the atoms were in the sample and what their shapes might be. Previously, electron ptychography had only been used to image extremely flat samples: those merely one to a few atoms thick. The new study, published in Science, now allows it to capture multiple layers tens to hundreds of atoms thick. That makes the technique much more relevant to materials scientists, who typically study the properties of samples with a thickness of about 30 to 50 nanometers. (That range is smaller than the length your fingernails grow in a minute but many times thicker than what electron ptychography could image in the past.) "They can actually look at stacks of atoms now, so it's amazing," says Andrew Maiden, an engineer at the University of Sheffield in England, who helped develop ptychography but was not involved with the new study. "The resolution is just staggering."

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The most severe heat wave in the history of the Pacific Northwest is nearing its climax. The National Weather Service had predicted it would be "historic, dangerous, prolonged and unprecedented," and it is living up to its billing as it rewrites the record books. From a report: On Sunday, Portland, Ore., soared to its highest temperature in more than 80 years of record-keeping: 112 degrees. This new mark occurred just one day after hitting 108, which had broken the previous all-time record of 107. Seattle surged to 104 degrees Sunday, surpassing the old record of 103. The extraordinary heat swelled north of the international border as Canada saw its highest temperature recorded Sunday afternoon, when Lytton in British Columbia surged to 116 degrees. For perspective, that is just 1 degree from the all-time record in Las Vegas. While temperatures may have peaked Sunday afternoon in a few places, many were expected to turn even hotter on Monday or Tuesday, breaking all-time records (a number of which were initially broken Saturday and/or Sunday).

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The discovery of a huge fossilised skull that was wrapped up and hidden in a Chinese well nearly 90 years ago has forced scientists to rewrite the story of human evolution. Shmoodling writes: Analysis of the remains has revealed a new branch of the human family tree that points to a previously unknown sister group more closely related to modern humans than the Neanderthals. The extraordinary fossil has been named a new human species, Homo longi or "Dragon man," by Chinese researchers, although other experts are more cautious about the designation. "I think this is one of the most important finds of the past 50 years," said Prof Chris Stringer, research leader at the Natural History Museum in London, who worked on the project. "It's a wonderfully preserved fossil." The skull appears to have a remarkable backstory. According to the researchers, it was originally found in 1933 by Chinese labourers building a bridge over the Songhua River in Harbin, in China's northernmost province, Heilongjiang, during the Japanese occupation. To keep the skull from falling into Japanese hands it was wrapped and hidden in an abandoned well, resurfacing only in 2018 after the man who hid it told his grandson about it shortly before he died. Details are published in three papers in The Innovation.

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Scientists have managed to slow down the atoms almost to a complete stop in the largest macro-scale object yet. The research has been published in the journal Science. New Atlas reports: The temperature of a given object is directly tied to the motion of its atoms -- basically, the hotter something is, the more its atoms jiggle around. By extension, there's a point where the object is so cold that its atoms come to a complete standstill, a temperature known as absolute zero (-273.15 C, -459.67 F). Scientists have been able to chill atoms and groups of atoms to a fraction above absolute zero for decades now, inducing what's called the motional ground state. This is a great starting point to then create exotic states of matter, such as supersolids, or fluids that seem to have negative mass. Understandably, it's much harder to do with larger objects, because they're made up of more atoms which are all interacting with their surroundings. But now, a large international team of scientists has broken the record for largest object to be induced into a motional ground state (or extremely closely to one, anyway). Most of the time, these experiments are done with clouds of millions of atoms, but the new test was performed on a 10-kg (22-lb) object that contains almost an octillion atoms. Strangely enough, that "object" isn't just one thing itself but the combined motion of four different objects, with a mass of 40 kg (88 lb) each. The researchers conducted the experiment at LIGO, a huge facility famous for detecting gravitational waves as they wash over Earth. It does this by beaming lasers down two 4-km (2.5-mile) tunnels, and bouncing them back with mirrors -- and those mirrors were the objects that the new study cooled to a motional ground state. The photons of light in LIGO's lasers exert tiny bumps on the mirrors as they bounce off, and these disturbances can be measured in later photons. Since the beams are constant, the scientists have plenty of data about the motions of the atoms in the mirrors -- meaning they can then design the perfect counteracting forces. To do so, the researchers attached electromagnets to the back of each mirror, which reduced their collective motion almost to the motional ground state. The mirrors moved less than one-thousandth the width of a proton, essentially cooling down to a crisp 77 nanokelvins -- a hair above absolute zero. The team says that this breakthrough could enable new quantum experiments on the macro scale.

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An anonymous reader quotes a report from Scientific American: Few harbingers of old age are clearer than the sight of gray hair. As we grow older, black, brown, blonde or red strands lose their youthful hue. Although this may seem like a permanent change, new research reveals that the graying process can be undone -- at least temporarily. In a study published today in eLife, a group of researchers provide the most robust evidence of this phenomenon to date in hair from around a dozen people of various ages, ethnicities and sexes. It also aligns patterns of graying and reversal to periods of stress, which implies that this aging-related process is closely associated with our psychological well-being. The researchers [...] developed a technique to digitize and quantify the subtle changes in color, which they dubbed hair pigmentation patterns, along each strand. These patterns revealed something surprising: In 10 of [the 14 participants], who were between age nine and 39, some graying hairs regained color. The team also found that this occurred not just on the head but in other bodily regions as well. "When we saw this in pubic hair, we thought, 'Okay, this is real,'" [Martin Picard, a mitochondrial psychobiologist at Columbia University] says. "This happens not just in one person or on the head but across the whole body." He adds that because the reversibility only appeared in some hair follicles, however, it is likely limited to specific periods when changes are still able to occur. Most people start noticing their first gray hairs in their 30s -- although some may find them in their late 20s. This period, when graying has just begun, is probably when the process is most reversible, according to [study co-author Ralf Paus, a dermatologist at the University of Miami]. In those with a full head of gray hair, most of the strands have presumably reached a "point of no return," but the possibility remains that some hair follicles may still be malleable to change, he says. In a small subset of participants, the researchers pinpointed segments in single hairs where color changes occurred in the pigmentation patterns. Then they calculated the times when the change happened using the known average growth rate of human hair: approximately one centimeter per month. These participants also provided a history of the most stressful events they had experienced over the course of a year. This analysis revealed that the times when graying or reversal occurred corresponded to periods of significant stress or relaxation. In one individual, a 35-year-old man with auburn hair, five strands of hair underwent graying reversal during the same time span, which coincided with a two-week vacation. Another subject, a 30-year-old woman with black hair, had one strand that contained a white segment that corresponded to two months during which she underwent marital separation and relocation -- her highest-stress period in the year.

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For some time, a collaboration of biologists, chemists and physicists centered at the Universities of Oldenburg (Germany) and Oxford (UK) have been gathering evidence suggesting that the magnetic sense of migratory birds such as European robins is based on a specific light-sensitive protein in the eye. In the current edition of the journal Nature, this team demonstrate that the protein cryptochrome 4, found in birds' retinas, is sensitive to magnetic fields and could well be the long-sought magnetic sensor. Phys.Org reports: First author Jingjing Xu, a doctoral student in Henrik Mouritsen's research group in Oldenburg, took a decisive step toward this success. After extracting the genetic code for the potentially magnetically sensitive cryptochrome 4 in night-migratory European robins, she was able, for the first time, to produce this photoactive molecule in large quantities using bacterial cell cultures. Christiane Timmel's and Stuart Mackenzie's groups in Oxford then used a wide range of magnetic resonance and novel optical spectroscopy techniques to study the protein and demonstrate its pronounced sensitivity to magnetic fields. The team also deciphered the mechanism by which this sensitivity arises -- another important advance. "Electrons that can move within the molecule after blue-light activation play a crucial role," explains Mouritsen. Proteins like cryptochrome consist of chains of amino acids: robin cryptochrome 4 has 527 of them. Oxford's Peter Hore and Oldenburg physicist Ilia Solov'yov performed quantum mechanical calculations supporting the idea that four of the 527 -- known as tryptophans -- are essential for the magnetic properties of the molecule. According to their calculations, electrons hop from one tryptophan to the next generating so-called radical pairs which are magnetically sensitive. To prove this experimentally, the team from Oldenburg produced slightly modified versions of the robin cryptochrome, in which each of the tryptophans in turn was replaced by a different amino acid to block the movement of electrons. Using these modified proteins, the Oxford chemistry groups were able to demonstrate experimentally that electrons move within the cryptochrome as predicted in the calculations -- and that the generated radical pairs are essential to explain the observed magnetic field effects. Hore says "if we can prove that cryptochrome 4 is the magnetic sensor we will have demonstrated a fundamentally quantum mechanism that makes animals sensitive to environmental stimuli a million times weaker than previously thought possible."

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Wired published a long extract from Amit Katwala's book Quantum Computing: How It Works and How It Could Change the World — explaining how it's already being put to use to explore some of science's biggest secrets by simulating nature itelf: Some of the world's top scientists are engaged in a frantic race to find new battery technologies that can replace lithium-ion with something cleaner, cheaper and more plentiful. Quantum computers could be their secret weapon... Although we've known all the equations we need to simulate chemistry since the 1930s, we've never had the computing power available to do it... In January 2020, researchers at IBM published an early glimpse of how quantum computers could be useful in the Noisy Intermediate-Scale Quantum Computing era. Working with the German car manufacturer Daimler on improving batteries for electric vehicles, they used a small-scale quantum computer to simulate the behaviour of three molecules containing lithium, which could be used in the next generation of lithium-sulphur batteries that promise to be more powerful and cheaper than today's power cells.. Some other examples: "Chemistry challenges just waiting for a quantum computer powerful and reliable enough to crack them range from the extraction of metals by catalysis through to carbon dioxide fixation, which could be used to capture emissions and slow climate change. But the one with the potential for the biggest impact might be fertiliser production... Some plants rely on bacteria which use an enzyme called nitrogenase to 'fix' nitrogen from the atmosphere and incorporate it into ammonia. Understanding how this enzyme works would be an important step towards...creating less energy-intensive synthetic fertilisers." "Solar panels are another area where quantum computers could help, by accelerating the search for new materials. This approach could also help to identify new materials for batteries, and superconductors that work at room temperature, which would drive advances in motors, magnets and perhaps even quantum computers themselves...." "Quantum computing could help scientists model complex interactions and processes in the body, enabling the discovery of new treatments for diseases such as Alzheimer's, or a quicker understanding of new diseases such as Covid-19. Artificial intelligence is already being used by companies such as DeepMind to gain insight into protein folding — a key facet of growth and disease — and quantum computers will accelerate this effort."

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Immortality and everlasting youth are the stuff of myths, according to new research which may finally end the eternal debate about whether we can live for ever. From a report: Backed by governments, business, academics and investors in an industry worth $110bn -- and estimated to be worth $610bn by 2025 -- scientists have spent decades attempting to harness the power of genomics and artificial intelligence to find a way to prevent or even reverse ageing. But an unprecedented study has now confirmed that we probably cannot slow the rate at which we get older because of biological constraints. The study, by an international collaboration of scientists from 14 countries and including experts from the University of Oxford, set out to test the "invariant rate of ageing" hypothesis, which says that a species has a relatively fixed rate of ageing from adulthood. "Our findings support the theory that, rather than slowing down death, more people are living much longer due to a reduction in mortality at younger ages," said Jose Manuel Aburto from Oxford's Leverhulme Centre for Demographic Science, who analysed age-specific birth and death data spanning centuries and continents. "We compared birth and death data from humans and non-human primates and found this general pattern of mortality was the same in all of them," said Aburto. "This suggests that biological, rather than environmental factors, ultimately control longevity. The statistics confirmed, individuals live longer as health and living conditions improve which leads to increasing longevity across an entire population. Nevertheless, a steep rise in death rates, as years advance into old age, is clear to see in all species."

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If someone created a flying machine capable of tracking you down by listening for your voice, you might be creeped out. But what if you were pinned under a pile of rubble after a natural disaster and first responders couldn't locate you? Maybe then a human-seeking drone wouldn't be such a terrible idea. From a report: That concept is the focus for engineers at Germany's Fraunhofer FKIE institute, who've built a drone prototype designed to find people by detecting human screams and listening for other signs of distress. One of the lead engineers, Macarena Varela, showcased their progress last week at an annual conference hosted by the Acoustic Society of America. While it's easy to imagine human-seeking drones in a sci-fi horror movie, Varela says the gadget would be ideal for post-disaster scenarios, such as earthquakes, hurricanes and wildfires. They could hover over an area that rescue crews have difficulty getting to and pinpoint where people may be trapped. "[Drones] can cover a larger area in a shorter period of time than rescuers or trained dogs on the ground," Varela said. "If there's a collapsed building, it can alert and assist rescuers. It can go places they can't fly to or get to themselves." Unmanned aerial vehicles or drones are commonly used for search-and-rescue missions when disasters strike. Most often, they take aerial images of structural damage. Some have thermal imaging capabilities to scan for body heat, while larger drones can deliver medical supplies and other goods to people in isolated areas. But researchers are finding more novel uses for an extra set of eyes in the sky -- and noses. The University of Washington imagines drones that use smell to locate disaster survivors. The Aerospace Corporation is working on drones that can visually identify dogs and share their location with rescue teams. The University of Zurich developed a drone to change shape midflight to fit into oddly shaped crevices. Locating people using aerial acoustics presents its share of challenges. An auditory system would need to decipher between human cries and sounds that often happen in nature, such as animal calls and wind. It might also need to recognize patterns associated with kicking, clapping or other ways people try to get the attention of rescue teams.

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An anonymous reader quotes a report from Scientific American: Elephants possess an incredibly rich repertoire of communication techniques, including hundreds of calls and gestures that convey specific meanings and can change depending on the context. Different elephant populations also exhibit culturally learned behaviors unique to their specific group. Elephant behaviors are so complex, in fact, that even scientists may struggle to keep up with them all. Now, to get the animals and researchers on the same page, a renowned biologist who has been studying endangered savanna elephants for nearly 50 years has co-developed a digital elephant ethogram, a repository of everything known about their behavior and communication. [Joyce Poole, co-founder and scientific director of ElephantVoices, a nonprofit science and conservation organization, and co-creator of the new ethogram] built the easily searchable public database with her husband and research partner Petter Granli after they came to realize that scientific papers alone would no longer cut it for cataloging the discoveries they and others were making. The Elephant Ethogram currently includes more than 500 behaviors depicted through nearly 3,000 annotated videos, photographs and audio files. The entries encompass the majority, if not all, of typical elephant behaviors, which Poole and Granli gleaned from more than 100 references spanning more than 100 years, with the oldest records dating back to 1907. About half of the described behaviors came from the two investigators' own studies and observations, while the rest came from around seven other leading savanna elephant research teams. While the ethogram is primarily driven by Poole and Granli's observations, "there are very few, if any, examples of behaviors described in the literature that we have not seen ourselves," Poole points out. The project is also just beginning, she adds, because it is meant to be a living catalog that scientists actively contribute to as new findings come in. Poole and Granli believe the exhaustive, digitized Elephant Ethogram is the first of its kind for any nonhuman wild animal. The multimedia-based nature of the project is important, Poole adds, because with descriptions based only on the written word, audio files or photographs, "it is hard to show the often subtle differences in movement that differentiate one behavior from another." Now that the project is online, Poole hopes other researchers will begin contributing their own observations and discoveries, broadening the database to include cultural findings from additional savanna elephant populations and unusual behaviors Poole and Granli might have missed.

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Bdelloid rotifers typically live in watery environments and have an incredible ability to survive. Russian scientists found the creatures in a core of frozen soil extracted from the Siberian permafrost using a drilling rig. CNN reports:"Our report is the hardest proof as of today that multicellular animals could withstand tens of thousands of years in cryptobiosis, the state of almost completely arrested metabolism," said Stas Malavin, a researcher at the Soil Cryology Laboratory at the Pushchino Scientific Center for Biological Research in Russia. Earlier research by other groups had shown that the rotifers could survive up to 10 years when frozen. In a new study, the Russian researchers used radiocarbon dating to determine that the critters they recovered from the permafrost -- ground that is frozen year-round, apart from a thin layer near the surface -- were about 24,000 years old. The study was published in the journal Current Biology on Monday. It's not the first time ancient life has been resurrected from a permanently frozen habitat.

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larryjoe writes: A curtain of bubbles in Amsterdam's Westerdok canal filters 86% of trash floating down the canal. The bubbles come from a pipe at the bottom of the canal connected to an air compressor. Holes in the pipe allow the bubbles to float to the water surface, forming a water curtain that pushes trash to the water surface. The curtain is positioned in a skewed orientation to allow the downstream water flow to channel the trash to a catchment system. This novel system catches many types of trash without a physical barrier that impedes vehicles or wildlife. The catchment system only keeps trash that is at least 10mm in size to allow small wildlife to escape. This filtering system is being trialed by a small startup.

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Engineers at MIT have recently announced that they have successfully developed a programmable fiber. Interesting Engineering reports: Featured in Nature Communications, this new research could result in the development of wearable tech that could sense, store, analyze, and infer the activity(s) of its wearers in real-time. The senior author of the study, Yeol Fink, believes that digital fibers like those developed in this study could help expand the possibilities for fabrics to "uncover the context of hidden patterns in the human body that could be used for physical performance monitoring, medical inference, and early disease detection." Applications for the technology could even expand into other areas of our lives like, for example, storing wedding music within the bride's gown. The fibers were created by chaining hundreds of microscale silicon digital chips into a preform to make a new "smart" polymer fiber. By using precision control, the authors of the study were able to create fibers with the continuous electrical connection between each chip of tens of meters. These fibers are thin and flexible and can even be passed through the eye of a needle. This would mean they could be seamlessly (pun intended) woven into existing fabrics, and can even withstand being washed at least ten times without degrading. This would mean this wearable tech could be retrofitted to existing clothing and you wouldn't even know it's there. Such innovation is interesting, but it could open up doors for applications only ever dreamed of. The fiber also has a pretty decent storage capacity too -- all things considered. During the research, it was found to be possible to write, store, and recall 767-kilobit full-color short movie files and a 0.48-megabyte music file. The files can be stored for two months without power. The fibers also integrate a neural network with thousands of connections. This was used to monitor and analyze the surface body temperature of a test subject after being woven into the armpit of the shirt. By training the neural network with 270-minutes of data the team got it to predict the minute-by-minute activity of the shirt's wearer with 96% accuracy. The fibers are also controlled using a small external device that could have microcontrollers added to it in the future.

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Towns and cities across Scotland would be devastated if the country's coastline was hit by a tsunami of the kind that happened 8,200 years ago, according to an academics' study. From a report: While about 370 miles of Scotland's northern and eastern coastline were affected when the Storegga tsunami struck, the study suggests a modern-day disaster of the same magnitude would have worse consequences. The researchers at the universities of Sheffield, St Andrews and York attributed this to denser human populations and higher sea levels that could potentially destroy seafront and port areas of Arbroath, Stonehaven, Aberdeen, Inverness and Wick, all of which have significant built-up areas less than 10 metres above sea level and directly face the sea. The study which maps the impact of the ancient tsunami for the first time, used modelling to estimate how far the wave would have travelled inland. The estimates suggest the water could have encroached up to 18 miles inland. That distance today would probably leave a town such as Montrose, which overlooks a tidal lagoon and has a population of 12,000, completely devastated.

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Electrical engineers at the University of California San Diego developed a technology that improves the resolution of an ordinary light microscope so that it can be used to directly observe finer structures and details in living cells. Phys.Org reports: "This material converts low resolution light to high resolution light," said Zhaowei Liu, a professor of electrical and computer engineering at UC San Diego. "It's very simple and easy to use. Just place a sample on the material, then put the whole thing under a normal microscope -- no fancy modification needed." The work, which was published in Nature Communications, overcomes a big limitation of conventional light microscopes: low resolution. Light microscopes are useful for imaging live cells, but they cannot be used to see anything smaller. Conventional light microscopes have a resolution limit of 200 nanometers, meaning that any objects closer than this distance will not be observed as separate objects. And while there are more powerful tools out there such as electron microscopes, which have the resolution to see subcellular structures, they cannot be used to image living cells because the samples need to be placed inside a vacuum chamber. The technology consists of a microscope slide that's coated with a type of light-shrinking material called a hyperbolic metamaterial. It is made up of nanometers-thin alternating layers of silver and silica glass. As light passes through, its wavelengths shorten and scatter to generate a series of random high-resolution speckled patterns. When a sample is mounted on the slide, it gets illuminated in different ways by this series of speckled light patterns. This creates a series of low resolution images, which are all captured and then pieced together by a reconstruction algorithm to produce a high resolution image. The researchers tested their technology with a commercial inverted microscope. They were able to image fine features, such as actin filaments, in fluorescently labeled Cos-7 cells -- features that are not clearly discernible using just the microscope itself. The technology also enabled the researchers to clearly distinguish tiny fluorescent beads and quantum dots that were spaced 40 to 80 nanometers apart. The findings appear in the journal Nature Communications. Liu's team previously published a paper showing that his technology is also capable of imaging with ultra-high axial resolution (about 2 nanometers). They are now working on combining the two together.

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Last fall, with the Medici Chapel in Florence operating on reduced hours because of Covid-19, scientists and restorers completed a secret experiment: They unleashed grime-eating bacteria on the artist's masterpiece marbles. From a report: As early as 1595, descriptions of stains and discoloration began to appear in accounts of a sarcophagus in the graceful chapel Michelangelo created as the final resting place of the Medicis. In the ensuing centuries, plasters used to incessantly copy the masterpieces he sculpted atop the tombs left discoloring residues. His ornate white walls dimmed. Nearly a decade of restorations removed most of the blemishes, but the grime on the tomb and other stubborn stains required special, and clandestine, attention. In the months leading up to Italy's Covid-19 epidemic and then in some of the darkest days of its second wave as the virus raged outside, restorers and scientists quietly unleashed microbes with good taste and an enormous appetite on the marbles, intentionally turning the chapel into a bacterial smorgasbord. "It was top secret," said Daniela Manna, one of the art restorers. On a recent morning, she reclined -- like Michelangelo's allegorical sculptures of Dusk and Dawn above her -- and reached into the shadowy nook between the chapel wall and the sarcophagus to point at a dirty black square, a remnant showing just how filthy the marble had become. She attributed the mess to one Medici in particular, Alessandro Medici, a ruler of Florence, whose assassinated corpse had apparently been buried in the tomb without being properly eviscerated. Over the centuries, he seeped into Michelangelo's marble, the chapel's experts said, creating deep stains, button-shaped deformations, and, more recently, providing a feast for the chapel's preferred cleaning product, a bacterium called Serratia ficaria SH7. "SH7 ate Alessandro," Monica Bietti, former director of the Medici Chapels Museum, said as she stood in front of the now gleaming tomb, surrounded by Michelangelos, dead Medicis, tourists and an all-woman team of scientists, restorers and historians. Her team used bacteria that fed on glue, oil and apparently Alessandro's phosphates as a bioweapon against centuries of stains.

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sciencehabit writes: Using an observatory on the edge of the Tibetan Plateau, astronomers have spotted the highest energy light ever, gamma ray photons up to 1.4 petaelectronvolts (PeV). They have traced these extreme photons back to a dozen of their likely sources: powerful factories in the Milky Way Galaxy that accelerate charged particles called cosmic rays. The results are challenging theorists' understanding of what these factories are and how they generate such high-energy light. "The findings are extremely important and impressive," says Petra Huentemeyer, an astrophysicist at Michigan Technological University and spokesperson for a rival gamma ray telescope, the High-Altitude Water Cherenkov Observatory (HAWC) in Mexico. "It's a giant leap toward finally understanding the origin of the highest energy cosmic rays." Discovered more than 100 years ago, cosmic rays are charged particles, including protons and other atomic nuclei, that have been accelerated nearly to the speed of light. Their sources are poorly understood because interstellar magnetic fields bend them on their path to Earth. However, as cosmic rays rocket away from their sources, they also emit photons, usually about one-tenth as energetic as the cosmic rays themselves, that follow a straight path to Earth. Although Earth's atmosphere blocks this gamma ray light, when the photons slam into air molecules, they create showers of secondary particles and faint blue Cherenkov light that astronomers can look for. China's Large High Altitude Air Shower Observatory (LHAASO) aims to catch the air showers associated with the highest energy gamma rays, which in turn correspond to the highest energy cosmic rays.

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Scientists monitoring the ruins of the Chernobyl nuclear power plant in Ukraine have seen a surge in fission reactions in an inaccessible chamber within the complex. They are now investigating whether the problem will stabilise or require a dangerous and difficult intervention to prevent a runaway nuclear reaction. From a report: The explosion at Chernobyl in 1986 brought down walls and sealed off many rooms and corridors. Tonnes of fissile material from the interior of a reactor were strewn throughout the facility and the heat it generated melted sand from the reactor walls with concrete and steel to form lava-like and intensely radioactive substances that oozed into lower floors. One chamber, known as subreactor room 305/2, is thought to contain large amounts of this material, but it is inaccessible and hasn't been seen by human or robotic eyes since the disaster. Now, researchers have seen a spike in neutron emissions from the room, with levels increasing around 40 per cent since the start of 2016. This points to a growing nuclear fission reaction, so researchers are trying to determine if this surge will fizzle out, as previous spikes in other parts of the ruins have done, or whether they will need to find a way to access the room and intervene. Neil Hyatt at the University of Sheffield, UK, who studies nuclear waste disposal, likens the situation to "embers in a barbecue pit" and says "it's a reminder to us that it's not a problem solved, it's a problem stabilised." One suggestion for why this is happening is that a new structure placed over the ruined reactor in 2016 is causing the plant to dry out. When uranium or plutonium fuel decay radioactively, they emit neutrons, which can promote a fission reaction if the neutrons are captured by another radioactive nuclei. However, large amounts of water slow these neutrons down, preventing them from being captured. The original shelter, which was hurriedly constructed over the reactor in the months following the accident, was riddled with holes that allowed rainwater and birds inside. If the rainwater was helping to suppress reactions in room 305/2, its absence due to the new structure could mean there is no longer enough water in the room to sufficiently slow neutrons down.

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