"In late 2021, operators of the European Space Agency's Swarm constellation noticed something worrying," reports Space.com. "The satellites, which measure the magnetic field around Earth, started sinking toward the atmosphere at an unusually fast rate — up to 10 times faster than before.

"The change coincided with the onset of the new solar cycle, and experts think it might be the beginning of some difficult years for spacecraft orbiting our planet." "In the last five, six years, the satellites were sinking about two and a half kilometers [1.5 miles] a year," Anja Stromme, ESA's Swarm mission manager, told Space.com. "But since December last year, they have been virtually diving. The sink rate between December and April has been 20 kilometers [12 miles] per year."

Satellites orbiting close to Earth always face the drag of the residual atmosphere, which gradually slows the spacecraft and eventually makes them fall back to the planet. (They usually don't survive this so-called re-entry and burn up in the atmosphere.) This atmospheric drag forces the International Space Station's controllers to perform regular "reboost" maneuvers to maintain the station's orbit of 250 miles (400 km) above Earth. This drag also helps clean up the near-Earth environment from space junk.

Scientists know that the intensity of this drag depends on solar activity — the amount of solar wind spewed by the sun, which varies depending on the 11-year solar cycle.... [S]ince last fall, the star has been waking up, spewing more and more solar wind and generating sunspots, solar flares and coronal mass ejections at a growing rate. And the Earth's upper atmosphere has felt the effects. "There is a lot of complex physics that we still don't fully understand going on in the upper layers of the atmosphere where it interacts with the solar wind," Stromme said. "We know that this interaction causes an upwelling of the atmosphere. That means that the denser air shifts upwards to higher altitudes."

Denser air means higher drag for the satellites. Even though this density is still incredibly low 250 miles above Earth, the increase caused by the upwelling atmosphere is enough to virtually send some of the low-orbiting satellites plummeting. "It's almost like running with the wind against you," Stromme said. "It's harder, it's drag — so it slows the satellites down, and when they slow down, they sink...." The lower the orbit of the satellites when the solar storm hits, the higher the risk of the spacecraft not being able to recover, leaving operators helplessly watching as the craft fall to their demise in the atmosphere....

All spacecraft around the 250-mile altitude are bound to have problems, Stromme said. That includes the International Space Station, which will have to perform more frequent reboost maneuvers to keep afloat, but also the hundreds of cubesats and small satellites that have populated low Earth orbit in the past decade.... "Many of these [new satellites] don't have propulsion systems," Stromme said. "They don't have ways to get up. That basically means that they will have a shorter lifetime in orbit. They will reenter sooner than they would during the solar minimum."
Thanks to long-time Slashdot reader schwit1 for sharing the article!

"China's Mars sample return mission aims to collect samples from the Red Planet and deliver them to Earth in 2031, or two years ahead of a NASA and ESA joint mission," reports SpaceNews: Lifting off in late 2028... the complex, multi-launch mission will have simpler architecture in comparison with the joint NASA-ESA project, with a single Mars landing and no rovers sampling different sites. However, if successful, it would deliver to Earth the first collected Martian samples; an objective widely noted as one of the major scientific goals of space exploration....

The mission will build on the Mars entry, descent and landing technologies and techniques demonstrated by Tianwen-1 in May 2021, as well as the regolith sampling, automated lunar orbit rendezvous and docking, and high velocity atmospheric reentry success achieved by the 2020 Chang'e-5 lunar sample return mission.... Landing on Mars would take place around September 2029. Sampling techniques will include surface sampling, drilling and mobile intelligent sampling, potentially using a four-legged robot.

The ascent vehicle will consist of two stages, using either solid or liquid propulsion, and will be required to reach a speed of 4.5 kilometers per second, according to the presentation. After rendezvous and docking with the waiting orbiter, the spacecraft will depart Mars orbit in late October 2030 for a return to Earth in July 2031.

Sun Zezhou [chief designer of the Tianwen-1 Mars orbiter and rover mission], added that the Tianwen-1 orbiter will conduct an aerobraking test in Mars orbit later this year as part of the sample return mission preparation.
Thanks to Slashdot reader Hmmmmmm for sharing the story!

LinkedIn recently added 'dyslexic thinking' as an official skill.

And now the U.K. national newspaper the Telegraph reports on scientists arguing that dyslexia is not a "disorder" — but an evolutionarily beneficial willingness to explore: The experts suggested that dyslexia, which causes difficulty reading, writing and spelling, is a useful specialisation and not a "neurocognitive condition"....

About one in five people have dyslexia, and their tendency to push the envelope would have been balanced out by other members of a prehistoric society, leading to a well-rounded group with equally useful skill sets. However, Dr Helen Taylor, from the University of Strathclyde, and Dr Martin Vestergaard, from the University of Cambridge, said that dyslexia was now seen as a problem because modern education systems focused on the things sufferers struggled with and neglected what they excelled at. They reassessed past studies on dyslexic individuals and disagreed with the prevailing theory that it was a cognitive deficit....

[S]ince the invention of written language, dyslexia has been seen as a problem, not a talent. "Schools, academic institutes and workplaces are not designed to make the most of explorative learning," said Dr Taylor. "We urgently need to start nurturing this way of thinking to allow humanity to continue to adapt and solve key challenges." They posit that dyslexic people are naturally more skilled "in realms like discovery, invention and creativity" and that this specialisation stems from millennia of human evolution.... Without the streak of curiosity and willingness to investigate that is commonplace in dyslexic brains, groups of people would likely struggle to survive, they said.

"The deficit-centred view of dyslexia isn't telling the whole story," said Dr Taylor. "We believe that the areas of difficulty experienced by people with dyslexia result from a cognitive trade-off between exploration of new information and exploitation of existing knowledge, with the upside being an explorative bias that could explain enhanced abilities observed in certain realms like discovery, invention and creativity.
The researchers argue this "explorative specialization in people with dyslexia could help explain why they have difficulties with tasks related to exploitation, such as reading and writing.

"It could also explain why people with dyslexia appear to gravitate towards certain professions that require exploration-related abilities, such as arts, architecture, engineering and entrepreneurship."

Thanks to Slashdot reader Bruce66423 for sharing the story

Long-time Slashdot reader schwit1 shares an announcement from London's Imperial College of Science, Technology and Medicine: A single MRI scan of the brain could be enough to diagnose Alzheimer's disease, according to new research by Imperial College London.

The research uses machine learning technology to look at structural features within the brain, including in regions not previously associated with Alzheimer's. The advantage of the technique is its simplicity and the fact that it can identify the disease at an early stage when it can be very difficult to diagnose. Although there is no cure for Alzheimer's disease, getting a diagnosis quickly at an early stage helps patients. It allows them to access help and support, get treatment to manage their symptoms and plan for the future. Being able to accurately identify patients at an early stage of the disease will also help researchers to understand the brain changes that trigger the disease, and support development and trials of new treatments....

The researchers adapted an algorithm developed for use in classifying cancer tumours, and applied it to the brain. They divided the brain into 115 regions and allocated 660 different features, such as size, shape and texture, to assess each region. They then trained the algorithm to identify where changes to these features could accurately predict the existence of Alzheimer's disease... They found that in 98 per cent of cases, the MRI-based machine learning system alone could accurately predict whether the patient had Alzheimer's disease or not. It was also able to distinguish between early and late-stage Alzheimer's with fairly high accuracy, in 79 per cent of patients.

Professor Eric Aboagye, from Imperial's Department of Surgery and Cancer, who led the research, said: "Currently no other simple and widely available methods can predict Alzheimer's disease with this level of accuracy, so our research is an important step forward...." The new system spotted changes in areas of the brain not previously associated with Alzheimer's disease, [which] opens up potential new avenues for research into these areas and their links to Alzheimer's disease.
Professor Aboagye adds that this new approach "could also identify early-stage patients for clinical trials of new drug treatments or lifestyle changes, which is currently very hard to do."

An anonymous reader quotes a report from Ars Technica: Earlier this year, news broke of the first experimental xenotransplantation: A human patient with heart disease received a heart from a pig that had been genetically engineered to avoid rejection. While initially successful, the experiment ended two months later when the transplant failed, leading to the death of the patient. At the time, the team didn't disclose any details regarding what went wrong. But this week saw the publication of a research paper that goes through everything that happened to prepare for the transplant and the weeks following. Critically, this includes the eventual failure of the transplant, which was triggered by the death of many of the muscle cells in the transplanted heart. But the reason for that death isn't clear, and the typical signs of rejection by the immune system weren't present. So, we're going to have to wait a while to understand what went wrong.
[...]
After death, the team performed an autopsy on the transplanted heart. They found that it had nearly doubled in weight, largely because of fluid (and some red blood cells) leaking out of blood vessels in the absence of clotting. There was significant death of heart muscle cells, but that was scattered across the heart, rather than being a general phenomenon. Critically, most of the indications of a strong immune rejection were missing. The presence of an apparent pig cytomegalovirus was worrying, but the researchers indicate there's some question about whether the tests that picked it up might have been recognizing a closely related human virus -- one that's often associated with organ transplant problems.

So, for now, it's not clear what happened with this transplant or what the significance of the apparent viral infection is. Obviously, the team has lots of material to work with to try to figure out what went on, and there's a long, long list of potential experiments to do with it. And there are also additional xenotransplant trials in the works, so it may not be long before we have a better sense of whether this was something specific to this transplant or a general risk of xenotransplantation.

The grave of a rocket body that slammed into the moon more than three months ago has been found. Space.com reports: Early this year, astronomers determined that a mysterious rocket body was on course to crash into the lunar surface on March 4. Their calculations suggested that the impact would occur inside Hertzsprung Crater, a 354-mile-wide (570 kilometers) feature on the far side of the moon. Their math was on the money, it turns out. Researchers with NASA's Lunar Reconnaissance Orbiter (LRO) mission announced last night (June 23) that the spacecraft had spotted a new crater in Hertzsprung -- almost certainly the resting place of the rogue rocket.

Actually, LRO imagery shows that the impact created two craters, an eastern one about 59 feet (18 meters) wide superimposed over a western one roughly 52 feet (16 m) across. "The double crater was unexpected and may indicate that the rocket body had large masses at each end," Mark Robinson of Arizona State University, the principal investigator of the Lunar Reconnaissance Orbiter Camera (LROC), wrote in an update last night. "Typically a spent rocket has mass concentrated at the motor end; the rest of the rocket stage mainly consists of an empty fuel tank," he added. "Since the origin of the rocket body remains uncertain, the double nature of the crater may help to indicate its identity."

As Robinson noted, the moon-crashing rocket remains mysterious. Early speculation held that it was likely the upper stage of the SpaceX Falcon 9 rocket that launched the Deep Space Climate Observatory (DSCOVR) mission for NASA and the U.S. National Oceanic and Atmospheric Administration in February 2015. But further observations and calculations changed that thinking, leading many scientists to conclude that the rocket body was probably part of the Long March 3 booster that launched China's Chang'e 5T1 mission around the moon in October 2014. China has denied that claim.

Engineers in Sydney have demonstrated a quantum integrated circuit made up of just a few atoms. By precisely controlling the quantum states of the atoms, the new processor can simulate the structure and properties of molecules in a way that could unlock new materials and catalysts. New Atlas reports: The new quantum circuit comes from researchers at the University of New South Wales (UNSW) and a start-up company called Silicon Quantum Computing (SQC). It's essentially made up of 10 carbon-based quantum dots embedded in silicon, with six metallic gates that control the flow of electrons through the circuit. It sounds simple enough, but the key lies in the arrangement of these carbon atoms down to the sub-nanometer scale. Relative to each other, they're precisely positioned to mimic the atomic structure of a particular molecule, allowing scientists to simulate and study the structure and energy states of that molecule more accurately than ever before.

In this case, they arranged the carbon atoms into the shape of the organic compound polyacetylene, which is made up of a repeating chain of carbon and hydrogen atoms with an alternating pattern of single and double carbon bonds between them. To simulate those bonds, the team placed the carbon atoms at different distances apart. Next, the researchers ran an electrical current through the circuit to check whether it would match the signature of a natural polyacetylene molecule -- and sure enough, it did. In other tests, the team created two different versions of the chain by cutting bonds at different places, and the resulting currents matched theoretical predictions perfectly. The significance of this new quantum circuit, the team says, is that it could be used to study more complicated molecules, which could eventually yield new materials, pharmaceuticals, or catalysts. This 10-atom version is right on the limit of what classical computers can simulate, so the team's plans for a 20-atom quantum circuit would allow for simulation of more complex molecules for the first time. The research has been published in the journal Nature.

Engineers at the European Space Agency (ESA) are getting ready for a Windows 98 upgrade on an orbiter circling Mars. The Verge reports: The Mars Express spacecraft has been operating for more than 19 years, and the Mars Advanced Radar for Subsurface and Ionospheric Sounding (MARSIS) instrument onboard has been using software built using Windows 98. Thankfully for humanity and the Red Planet's sake, the ESA isn't upgrading its systems to Windows ME. The MARSIS instrument on ESA's Mars Express was key to the discovery of a huge underground aquifer of liquid water on the Red Planet in 2018. This major new software upgrade "will allow it to see beneath the surfaces of Mars and its moon Phobos in more detail than ever before," according to the ESA. The agency originally launched the Mars Express into space in 2003 as its first mission to the Red Planet, and it has spent nearly two decades exploring the planet's surface.

MARSIS uses low-frequency radio waves that bounce off the surface of Mars to search for water and study the Red Planet's atmosphere. The instrument's 130-foot antenna is capable of searching around three miles below the surface of Mars, and the software upgrades will enhance the signal reception and onboard data processing to improve the quality of data that's sent back to Earth. "We faced a number of challenges to improve the performance of MARSIS," explains Carlo Nenna, a software engineer at Enginium who is helping ESA with the upgrade. "Not least because the MARSIS software was originally designed over 20 years ago, using a development environment based on Microsoft Windows 98!"

Recent studies in humans and mice have shown that late nights and early mornings may cause long lasting damage to your brain. From a report: The sleep debt collectors are coming. They want you to know that there is no such thing as forgiveness, only a shifting expectation of how and when you're going to pay them back. You think of them as you lie in bed at night. How much will they ask for? Are you solvent? You fall asleep, then wake up in a cold sweat an hour later. You fall asleep, then wake up, drifting in and out of consciousness until morning. As most every human has discovered, a couple nights of bad sleep is often followed by grogginess, difficulty concentrating, irritability, mood swings and sleepiness.

For years, it was thought that these effects, accompanied by cognitive impairments like lousy performances on short-term memory tests, could be primarily attributed to a chemical called adenosine, a neurotransmitter that inhibits electrical impulses in the brain. Spikes of adenosine had been consistently observed in sleep-deprived rats and humans. Adenosine levels can be quickly righted after a few nights of good sleep, however. This gave rise to a scientific consensus that sleep debt could be forgiven with a couple of quality snoozes -- as reflected in casual statements like "I'll catch up on sleep" or "I'll be more awake tomorrow."

But a review article published recently in the journal Trends in Neurosciences contends that the folk concept of sleep as something that can be saved up and paid off is bunk. The review, which canvassed the last couple of decades of research on long term neural effects of sleep deprivation in both animals and humans, points to mounting evidence that getting too little sleep most likely leads to long-lasting brain damage and increased risk of neurodegenerative disorders like Alzheimer's disease. "This is really, really important in setting the stage for what needs to be done in sleep health and sleep science," said Mary Ellen Wells, a sleep scientist at the University of North Carolina, who did not contribute to the review.

Female scientists are less likely to receive authorship credit or to be named on patents related to the work they do compared with their male counterparts -- including in fields such as healthcare, where women dominate -- data suggests. From a report: This gender gap may help to explain well-documented disparities in the apparent contributions of male and female scientists -- such as that of Rosalind Franklin, whose pivotal contribution to the discovery of the structure of DNA initially went unrecognised because she was not cited on the core Nature article by James Watson and Francis Crick.

"We have known for a long time that women publish and patent at a lower rate than men. But, because previous data never showed who participated in research, no one knew why," said Prof Julia Lane at New York University in the US, who led the new research. Lane and her colleagues analysed administrative data on research projects conducted at 52 US colleges and universities between 2013 and 2016. They matched information about 128,859 scientists to 39,426 journal articles and 7,675 patents, looking at which people who worked on individual projects received credit and which did not.

A rare, five-planet alignment will peak on June 24, allowing a spectacular viewing of Mercury, Venus, Mars, Jupiter and Saturn as they line up in planetary order. From a report: The event began at the beginning of June and has continued to get brighter and easier to see as the month has progressed, according to Diana Hannikainen, observing editor of Sky & Telescope. A waning crescent moon will be joining the party between Venus and Mars on Friday, adding another celestial object to the lineup. The moon will represent the Earth's relative position in the alignment, meaning this is where our planet will appear in the planetary order. This rare phenomenon has not occurred since December 2004, and this year, the distance between Mercury and Saturn will be smaller, according to Sky & Telescope.

The fourth and most recent attempt at a full launch rehearsal of NASA's Space Launch System went reasonably well, and despite some lingering issues and uncertainties, the agency is sending the rocket back to the hangar for final preparations in advance of its first flight. That inaugural launch will represent Artemis 1, the first mission in NASA's Artemis lunar program. Gizmodo reports: In a press release today, NASA -- to my surprise -- said it is done testing SLS after reviewing data from the recent launch rehearsal. That another full-blown rehearsal would be required seemed likely to me on account of an unresolved hydrogen leak linked to a faulty quick-connect fitting, which subsequently prevented ground teams from practicing the fully scheduled launch countdown on Monday. The goal was to reach T-10 seconds, but the launch controllers decided to quit the rehearsal at T-29 seconds for safety reasons. "NASA plans to return SLS and Orion to the pad for launch in late August," says the release. "NASA will set a specific target launch date after replacing hardware associated with the leak."

Despite the hydrogen leak and the incomplete countdown, Monday's wet dress did appear to go well. The ground teams finally managed to fully load SLS with propellants. Upwards of 755,000 gallons of cryogenic liquid oxygen and liquid hydrogen were supplied to the rocket's two stages, which the teams had failed to do during the first three attempts. What's more, all of the issues experienced during the first three wet dress rehearsals appear to have been resolved. The Orion spacecraft, currently sitting atop the rocket, also performed well during the test. Said Tom Whitmeyer, NASA's exploration systems manager, during a media teleconference on Tuesday: "We think that we had a really successful rehearsal," adding that there is "relative risk" is running a fifth wet dress, with the 322-foot-tall (98-meter) rocket standing fully exposed on the launch pad.

An anonymous reader quotes a report from Motherboard: Scientists have discovered a bacteria with cells that measure a full centimeter in length, an astonishing size that makes it by far the largest bacterial species ever found and even "challenges our concept of a bacterial cell," reports a new study. Bacteria are an extraordinarily diverse group of organisms that have inhabited Earth for billions of years and have evolved to occupy a dizzying variety of niches. Still, almost all of these microbes are composed of simple cells that measure about two microns in diameter, which is about 40 times smaller than a strand of human hair.

Thiomargarita magnifica, a bacteria discovered on sunken red mangrove leaves in Guadeloupe, Lesser Antilles, has blown this standard scale out of the water. The species has evolved filamentary cells that are "larger than all other known giant bacteria by ~50-fold," making them "visible to the naked eye," according to a study published on Thursday in Science. Scientists led by Jean-Marie Volland, a marine biologist who holds joint appointments at the Laboratory for Research in Complex Systems and the Joint Genome Institute (JGI), a U.S. Department of Energy office at Lawrence Berkeley National Laboratory, suspect that this record-breaking adaptation is partly due to the astonishing number of duplicated genes wielded by T. magnifica, an ability that is known as polyploidy. [...]

The results revealed that these bacteria contain DNA clusters in their cells, which are located in compartments bordered by membranes that the team called "pepins." These organized pepins provide a stark contrast to the free-floating DNA seen in the cells of most bacteria. In addition, the team's genetic sequencing revealed that T. magnifica contains hundreds of thousands of genome copies that are dispersed across the cell, adding up to about three times the number of genes in most bacteria, which is an extreme example of polyploidy. "These cellular features likely allow the organism to grow to an unusually large size and circumvent some of the biophysical and bioenergetic limitations on growth," Volland and his colleagues said.

Scientists have designed a tiny robot-fish that is programmed to remove microplastics from seas and oceans by swimming around and adsorbing them on its soft, flexible, self-healing body. From a report: Microplastics are the billions of tiny plastic particles which fragment from the bigger plastic things used every day such as water bottles, car tyres and synthetic T-shirts. They are one of the 21st century's biggest environmental problems because once they are dispersed into the environment through the breakdown of larger plastics they are very hard to get rid of, making their way into drinking water, produce, and food, harming the environment and animal and human health.

"It is of great significance to develop a robot to accurately collect and sample detrimental microplastic pollutants from the aquatic environment," said Yuyan Wang, a researcher at the Polymer Research Institute of Sichuan University and one of the lead authors on the study. Her team's novel invention is described in a research paper in the journal Nano Letters. "To the best of our knowledge, this is the first example of such soft robots." Researchers at Sichuan University have revealed an innovative solution to track down these pollutants when it comes to water contamination: designing a tiny self-propelled robo-fish that can swim around, latch on to free-floating microplastics, and fix itself if it gets cut or damaged while on its expedition.

China is grappling with extreme weather emergencies across the country, with the worst flooding in decades submerging houses and cars in the south and record-high heat waves in the northern and central provinces causing roads to buckle. From a report: Water levels in more than a hundred rivers across the country have surged beyond flood warning levels, according to the People's Daily, the ruling Communist Party's mouthpiece. The authorities in Guangdong Province on Tuesday raised alerts to the highest level after days of rainfall and floods, closing schools, businesses and public transport in affected areas. The flooding has disrupted the lives of almost half a million people in southern China. Footage on state media showed rescue crews on boats paddling across waterlogged roads to relieve trapped residents. In Shaoguan, a manufacturing hub, factories were ordered to halt production, as water levels have reached a 50-year high, state television reported. Guangdong's emergency management department said that the rainfall has affected 479,600 people, ruined nearly 30 hectares of crops and caused the collapse of more than 1,700 houses, with financial losses totaling $261 million, the official Xinhua News Agency reported.

NASA announced on Tuesday that it's contracting three suppliers to provide concept designs for nuclear fission energy systems designed for use on the moon. TechCrunch reports: The winning bids for this award came from Lockheed Martin, Westinghouse and IX (a joint venture from Intuitive Machines and X-Energy). Each will be working with a few partners to develop their systems, which will be "initial concepts" only for the purposes of satisfying this particular contract, and each will receive roughly $5 million for their work, expected to take around 12 months.

NASA is aptly partnering with the Department of Energy (DOE) on this project, and the specs include a 40-kilowatt power generation capability, capable of generating that for at least a decade. That's about what a full charge on a current entry-level Nissan Leaf contains -- but as a fission generator it would obviously provide that continuously. It may not seem like much, but deployed singularly or in groups to support a lunar base, it could solve a lot of the challenges of the kind of prolonged occupancy of the moon that NASA plans to eventually establish through its Artemis program, which seeks to return humans to our largest natural satellite for ongoing science missions. NASA also notes that the work done for this contract could have other future applications for propulsion systems for long-range spacecraft for deep space explorations.

An anonymous reader quotes a report from the Guardian: More than half the UK backs the idea of rewriting the DNA of human embryos to prevent severe or life-threatening diseases, according to a survey. Commissioned by the Progress Educational Trust (PET), a fertility and genomics charity, the Ipsos poll found that 53% of people support the use of human genome editing to prevent children from developing serious conditions such as cystic fibrosis.

There was less enthusiasm for use of the procedure to prevent milder conditions such as asthma, with only 36% in favor, and to create designer babies, with only a fifth expressing support, but views on the technology differed dramatically with age. Younger generations were far more in favor of designer babies than older people, with 38% of 16- to 24-year-olds and 31% of 25- to 34-year-olds supporting the use of gene editing to allow parents to choose features such as their child's height and eye and hair color. In the UK and many other countries it is illegal to perform genome editing on embryos that are intended for pregnancies, but the restrictions could be lifted if research shows the procedure can safely prevent severe diseases.

Cyborg locust brains can help spot the telltale signs of human cancer in the lab, a new study has shown. The team behind the work hopes it could one day lead to an insect-based breath test that could be used in cancer screening, or inspire an artificial version that works in much the same way. From a report: Other animals have been taught to spot signs that humans are sick. For example, dogs can be trained to detect when their owners' blood sugar levels start to drop, or if they develop cancer, tuberculosis, or even covid. In all cases, the animals are thought to be sensing chemicals that people emit through body odor or breath. The mix of chemicals can vary depending on a person's metabolism, which is thought to change when we get sick. But dogs are expensive to train and look after. And making a device that mimics a dog's nose has proved extremely difficult to do, says Debajit Saha, one of the scientists behind the latest work, which has not yet been peer-reviewed. "These changes are almost in parts per trillion," says Saha, a neural engineer at Michigan State University. This makes them hard to pick up even with state-of-the-art technologies, he adds. But animals have evolved to interpret such subtle changes in scents. So he and his colleagues decided to "hijack" an animal brain instead.

The Sun shone 20% less brightly on early Earth, and yet fossil evidence shows that our planet had warm shallow seas where stromatolites -- microbial mats -- thrived. Now a study may have solved the "faint young Sun paradox," showing that saltier oceans could have prevented Earth from freezing over during Archean times, 3bn years ago. From a report: We all know that the composition of the atmosphere (particularly the abundance of greenhouse gases) plays a crucial role in tempering Earth's climate, but what about the composition of the oceans? To answer this question researchers used an ocean-atmosphere general circulation model to investigate the impact of salinity.

They show that saltier oceans result in warmer climates, partly because the salt depresses the freezing point of seawater and inhibits sea-ice formation, but mostly because the greater density of salty water alters ocean circulation patterns and aids heat transport to the poles. Under their Archean scenario they show that present-day levels of salinity produce a severely glaciated world with only a narrow strip of open water at the equator. But pushing salinity up to 40% greater than today revealed a warmer Archean world, with average surface temperatures of more than 20C, and ice only appearing seasonally at the poles. Their findings are reported in Geophysical Research Letters.

More than half the UK backs the idea of rewriting the DNA of human embryos to prevent severe or life-threatening diseases, according to a survey. From a report: Commissioned by the Progress Educational Trust (PET), a fertility and genomics charity, the Ipsos poll found that 53% of people support the use of human genome editing to prevent children from developing serious conditions such as cystic fibrosis. There was less enthusiasm for use of the procedure to prevent milder conditions such as asthma, with only 36% in favour, and to create designer babies, with only a fifth expressing support, but views on the technology differed dramatically with age.

Younger generations were far more in favour of designer babies than older people, with 38% of 16- to 24-year-olds and 31% of 25- to 34-year-olds supporting the use of gene editing to allow parents to choose features such as their child's height and eye and hair colour. In the UK and many other countries it is illegal to perform genome editing on embryos that are intended for pregnancies, but the restrictions could be lifted if research shows the procedure can safely prevent severe diseases. Genome editing has been hailed as a potential gamechanger for dealing with a raft of heritable diseases ranging from cystic fibrosis and muscular dystrophy to Tay-Sachs, a rare condition that progressively destroys the nervous system. In principle, the faulty genes that cause the diseases can be rewritten in IVF embryos, allowing those embryos to develop into healthy babies.