The US Senate has slashed the budget for NASA's ambitious mission to return soil and rock samples from Mars' surface. From a report: NASA had asked for $949 million to support its Mars Sample Return mission, or MSR, in fiscal year 2024. In its proposed budget for the space agency, released Thursday, the Senate offered just $300 million and threatened to take that amount away. "The Committee has significant concerns about the technical challenges facing MSR and potential further impacts on confirmed missions, even before MSR has completed preliminary design review," stated the Commerce, Justice, Science, and Related Agencies subcommittee in its report on the budget.

The committee report, obtained by Ars, noted that Congress has spent $1.739 billion on the Mars Sample Return mission to date but that the public launch date -- currently 2028 -- is expected to slip, and cost overruns threaten other NASA science missions. Further, the report states that the $300 million allocated to the Mars mission will be rescinded if NASA cannot provide Congress with a guarantee that the mission's overall costs will not exceed $5.3 billion. In that case, most of the $300 million would be reallocated to the Artemis program to land humans on the Moon.

Temperatures are sizzling across Europe this week amid an intense and prolonged period of heat. And it's only just begun. From a report: Italy, Spain, France, Germany and Poland are all facing a major heatwave with air temperatures expected to climb to 48C on the islands of Sicily and Sardinia -- potentially the hottest temperatures ever recorded in Europe. An anticyclone -- a high-pressure area -- named Cerberus (named after the monster from Dante's Inferno) coming from the south will cause temperatures to rise above 40C across much of Italy. This comes after a spring and early summer full of storms and floods.

The highest temperature in European history was broken on 11 August 2021, when a temperature of 48.8C was recorded in Floridia, an Italian town in the Sicilian province of Syracuse. That record may be broken again in the coming days. The animation below uses data from the Copernicus Sentinel-3 mission's radiometer instrument and shows the land surface temperature across Italy between 9 and 10 July. As the image clearly shows, in some cities the surface of the land exceeded 45C, including Rome, Naples, Taranto and Foggia. Along the east slopes of Mount Etna in Sicily, many temperatures were recorded as over 50C.

The color of the ocean has changed significantly over the last 20 years and human-caused climate change is likely responsible, according to a new study. From a report: More than 56% of the world's oceans have changed color to an extent that cannot be explained by natural variability, said a team of researchers, led by scientists from the National Oceanography Center in the UK and the Massachusetts Institute of Technology in the US, in a statement. Tropical oceans close to the equator in particular have become greener in the past two decades, reflecting changes in their ecosystems, according to the study published Wednesday in the journal Nature. The color of the ocean is derived from the materials found in its upper layers.

For example, a deep blue sea will have very little life in it, whereas a green color means there are ecosystems there, based on phytoplankton, plant-like microbes which contain chlorophyll. The phytoplankton form the basis of a food web which supports larger organisms such as krill, fish, seabirds and marine mammals. It's not clear exactly how these ecosystems are changing, said study co-author Stephanie Dutkiewicz, senior research scientist in MIT's Department of Earth, Atmospheric and Planetary Sciences and the Center for Global Change Science. While some areas are likely to have less phytoplankton, others will have more -- and it's likely all parts of the ocean will see changes in the types of phytoplankton present. Ocean ecosystems are finely balanced and any change in the phytoplankton will send ripples across the food chain.

An Indian spacecraft blazed its way to the far side of the moon Friday in a follow-up mission to its failed effort nearly four years ago to land a rover softly on the lunar surface, the country's space agency said. From a report: Chandrayaan-3, the word for "moon craft" in Sanskrit, took off from a launch pad in Sriharikota in southern India with an orbiter, a lander and a rover, in a demonstration of India's emerging space technology. The spacecraft is set to embark on a journey lasting slightly over a month before landing on the moon's surface later in August. Applause and cheers swept through mission control at Satish Dhawan Space Center, where the Indian Space Research Organization's engineers and scientists celebrated as they monitored the launch of the spacecraft. Thousands of Indians cheered outside the mission control center and waved the national flag as they watched the spacecraft rise into the sky.

"Congratulations India. Chandrayaan-3 has started its journey towards the moon," ISRO Director Sreedhara Panicker Somanath said shortly after the launch. A successful landing would make India the fourth country -- after the United States, the Soviet Union, and China -- to achieve the feat. The six-wheeled lander and rover module of Chandrayaan-3 is configured with payloads that would provide data to the scientific community on the properties of lunar soil and rocks, including chemical and elemental compositions, said Dr. Jitendra Singh, junior minister for Science and Technology. India's previous attempt to land a robotic spacecraft near the moon's little-explored south pole ended in failure in 2019. It entered the lunar orbit but lost touch with its lander that crashed while making its final descent to deploy a rover to search for signs of water.

An anonymous reader quotes a report from the New York Times: A World Health Organization agency declared on Thursday that aspartame, an artificial sweetener widely used in diet drinks and low-sugar foods, could possibly cause cancer. A second W.H.O. committee, though, held steady on its assessment of a safe level of aspartame consumption. By some calculations using the panel's standard, a person weighing 150 pounds could avoid a risk of cancer but still drink about a dozen cans of diet soda a day. The declaration by a W.H.O. agency of a cancer risk associated with aspartame reflects the first time the prominent international body has weighed in publicly on the effects of the nearly ubiquitous artificial sweetener. Aspartame has been a contentious ingredient for decades.

The International Agency for Research on Cancer, or I.A.R.C., said it based its conclusion that aspartame was a possible carcinogen on limited evidence from three observational studies of humans that the agency said linked consumption of artificially sweetened beverages to an increase in cases of liver cancer -- at levels far below a dozen cans a day. It cautioned that the results could potentially be skewed toward the profile of people who drink higher amounts of diet drinks and called for further study. Still, people who consume high amounts of aspartame should consider switching to water or other unsweetened drinks, said Dr. Francesco Branca, director of the W.H.O. Department of Nutrition and Food Safety. But, he added: "Our results do not indicate that occasional consumption should pose a risk to most."

An Ohio plastic surgeon lost her medical license after the state medical board investigated her for livestreaming operations on TikTok and surgical complications reported by patients. From a report: The State Medical Board of Ohio voted at a hearing on Wednesday to permanently revoke Dr. Katharine Roxanne Grawe's medical license and to fine her $4,500 "based on her failure to meet standard of care." At the hearing, doctors on the board said that Dr. Grawe, known online as "Dr. Roxy," had previously been cautioned about protecting patient privacy on social media. They also spoke about her treatment of three unnamed patients who had reported complications from procedures, including one whose surgery Dr. Grawe had broadcast a part of on social media.

Dr. Jonathan B. Feibel, vice president of the medical board, recommended that Dr. Grawe's license be revoked because of the "life altering, reckless treatment" provided to those patients. "These outcomes were not normal complications like those that exist in the routine practice of medicine, but were rather caused by recklessness and disregard for the rules governing the practice of medicine in Ohio," he said.

In recent years, private equity firms have been gobbling up physician practices to form powerful medical groups across the country, according to a new report. The New York Times: In more than a quarter of local markets -- in places like Tucson, Ariz.; Columbus, Ohio; and Providence, R.I. -- a single private equity firm owned more than 30 percent of practices in a given specialty in 2021. In 13 percent of the markets, the firms owned groups employing more than half the local specialists. The medical groups were associated with higher prices in their respective markets, particularly when they controlled a dominant share, according to a paper by researchers at the Petris Center at the University of California, Berkeley, and the Washington Center for Equitable Growth, a progressive think tank in Washington, D.C.

When a firm controlled more than 30 percent of the market, the cost of care in three specialties -- gastroenterology, dermatology, and obstetrics and gynecology -- increased by double digits. The paper, published by the American Antitrust Institute, documented substantial private equity purchases across multiple medical specialties over the last decade. Urology, ophthalmology, cardiology, oncology, radiology and orthopedics have also been major targets for such deals. "It's shocking when you look at it," said Laura Alexander, director of markets and competition policy for the Washington Center, who said private equity firms dominated only a handful of markets a decade ago. By looking at individual markets, the researchers were able to document the local impact. "National rates mask this much more acute problem in local markets," she said.

An anonymous reader quotes a report from The Guardian: One of the world's longest commercial trials of a seaweed supplement that the global meat industry hopes could slash methane from beef cattle has recorded much lower reductions in the potent greenhouse gas than previous studies. Putting the supplement into the diets of 40 wagyu cattle in an Australian feedlot for 300 days cut the methane they produced by 28%. The supplement was derived from the red seaweed species Asparagopsis, which has been widely promoted as being able to cut methane by more than 80%, with some experiments suggesting reductions as high as 96%.

Globally, the UN's Food and Agriculture Organization estimates, methane from burping cattle -- known as enteric emissions -- releases about 2.1 billion tons of CO2-equivalent a year, compared with the 37.5 billion tons of CO2 from burning fossil fuels. But because methane is about 80 times more potent than CO2 at warming the planet over a 20-year period, cutting methane is seen as a way to slow global heating faster. The trial, reported by the red meat industry's marketing and research group Meat and Livestock Australia (MLA), also found animals given the supplement ate less food and weighed 15kg less by the time they were sent for slaughter. Dr Fran Cowley, a livestock scientist at the University of New England who led the trial, said it was the longest run so far using the red seaweed. She said more research was needed to understand why the wagyu in the trial had not delivered the same level of emissions reductions as other experiments.

One factor could be the way the methane was measured in the trial, which used an open-air system in a feedlot compared with animals measured in dedicated indoor chambers. But the trial report noted that other experiments over shorter timeframes using the same open-air measurement technique had recorded higher methane reductions. The seaweed was freeze-dried, mixed in canola oil and added to the animals' feed. In this trial it was given to the animals at slightly lower concentrations than other experiments that showed much higher methane reductions. Cowley said it was also not clear why the animals on the supplement ate less food and put on weight more slowly. Accounting for the extra 35 days the animals would have taken to reach the same weight would have theoretically meant the emissions savings were cut from 28% to 19% as they would have been alive for longer, all the time emitting methane. The study also found that the seaweed supplement had no effect on the wagyu's flavor or other properties.

A private Chinese company launched into orbit on Wednesday the world's first methane-liquid oxygen rocket, beating U.S. rivals in sending what could become the next generation of launch vehicles into space. Reuters reports: The Zhuque-2 carrier rocket blasted off at 9 a.m. (0100 GMT) from the Jiuquan Satellite Launch Center in northwest China and completed its flight according to plan, state media reported. It was the second attempt by Beijing-based LandSpace, one of the earliest firms in China's commercial launch sector, to launch the Zhuque-2. A first attempt in December failed.

Wednesday's launch put China ahead of U.S. rivals, including Elon Musk's SpaceX and Jeff Bezos' Blue Origin, in the race to launch carrier vehicles fueled by methane, which is deemed less polluting, safer, cheaper and a suitable propellant in a reusable rocket. LandSpace also became the second private Chinese company to launch a liquid-propellent rocket. In April, Beijing Tianbing Technology successfully launched a kerosene-oxygen rocket, taking another step towards developing rockets that can be re-fueled and reused.

The Perseverance rover's Scanning Habitable Environments with Raman & Luminescence for Organics & Chemicals (SHERLOC) instrument, designed to analyze organic chemicals on Mars, has provided valuable insights into the presence and distribution of potential organic materials on the surface of Mars. The findings have been published in the journal Nature. An anonymous reader shares a report from Ars Technica: SHERLOC comes with a deep-UV laser to excite molecules into fluorescing, and the wavelengths they fluoresce at can tell us something about the molecules present. It's also got the hardware to do Raman spectroscopy simultaneously. Collectively, these two capabilities indicate what kinds of molecules are present, though they can't typically identify specific chemicals. And, critically, SHERLOC provides spatial information, telling us where sample-specific signals come from. This allows the instrument to determine which chemicals are located in the same spot in a rock and thus were likely formed or deposited together.

SHERLOC can sample rocks simply by being held near them. The new results are based on a set of samples from two rock formations found on the floor of the Jezero crater. In some cases, the imaging was done by pointing it directly at a rock; in others, the rock surface, and any dust and contaminants it contained, was abraded away by Perseverance before the imaging was done. SHERLOC identified a variety of signatures of potential organic material in these samples. There were a few cases where it was technically possible that the signatures were produced by a very specific chemical that lacked carbon (primarily cerium salts). But, given the choice between a huge range of organic molecules or a very specific salt, the researchers favor organic materials as the source. One thing that was clear was that the level of organic material present changed over time. The deeper, older layer called Seitah only had a tenth of the material found in the Maaz rocks that formed above them. The reason for this difference isn't clear, but it indicates that either the production or deposition of organic material on Mars has changed over time.

Between the different samples and the ability to resolve different regions of the samples, the researchers were able to identify distinct signals that each occurred in many samples. While it wasn't possible to identify the specific molecule responsible, they were able to say a fair bit about them. One signal came from samples that contained a ringed organic compound, along with sulfates. The most common signal came from a two-ringed organic molecule, and was associated with various salts: phosphate, sulfate, silicates, and potentially a perchlorate. Another likely contained a benzene ring associated with iron oxides. A different ringed compound was found in two of the samples. Overall, the researchers conclude that these differences are significant. The fact that distinct organic chemicals are consistently associated with different salts suggests that there were either several distinct ways of synthesizing the organics or that they were deposited and preserved under distinct conditions. Many of the salts seen here are also associated with either water-based deposition or water-driven chemical alteration of the rock -- again, consistent with the processes involved changing over time. Collectively, the researchers say this argues against the organic chemicals simply having been delivered to Mars on a meteorite.

An anonymous reader quotes a report from Ars Technica: Two small spacecraft should have now been cruising through the Solar System on the way to study unexplored asteroids, but after several years of development and nearly $50 million in expenditures, NASA announced Tuesday the probes will remain locked inside a Lockheed Martin factory in Colorado. That's because the mission, called Janus, was supposed to launch last year as a piggyback payload on the same rocket with NASA's much larger Psyche spacecraft, which will fly to a 140-mile-wide (225-kilometer) metal-rich asteroid -- also named Psyche -- for more than two years of close-up observations. Problems with software testing on the Psyche spacecraft prompted NASA managers to delay the launch by more than a year. An independent review board set up to analyze the reasons for the Psyche launch delay identified issues with the spacecraft's software and weaknesses in the plan to test the software before Psyche's launch. Digging deeper, the review panel determined that NASA's Jet Propulsion Laboratory, which manages the Psyche mission, was encumbered by staffing and workforce problems exacerbated by the COVID-19 pandemic. Psyche is now back on track for liftoff in October on a SpaceX Falcon Heavy rocket, but Janus won't be aboard.

Janus was designed to fly to two binary asteroids -- consisting of two bodies near one another -- that orbit the Sun closer to Earth than the metallic asteroid Psyche. While the Psyche mission can still reach its asteroid destination and accomplish its science mission with a launch this year, the asteroids targeted by Janus will have changed positions in the Solar System by too much since last year. They are no longer accessible to the two Janus spacecraft without flying too far from the Sun for their solar arrays to generate sufficient power. When it became clear the two Janus target asteroids were no longer reachable, scientists on the Janus team and NASA management agreed last year to remove the twin spacecraft from the Psyche launch. Scientists considered other uses for the suitcase-size Janus spacecraft, which were already built and were weeks away from shipment to Florida to begin final launch preparations when NASA decided to delay the launch of Psyche.

One of the ideas to repurpose the Janus spacecraft was to send the probes to fly by asteroid Apophis, a space rock bigger than the Empire State Building that will encroach within 20,000 miles (32,000 kilometers) from our planet's surface in 2029. For a time soon after its discovery in 2004, scientists said there was a small chance Apophis could impact Earth in 2029 or later this century, but astronomers have now ruled out any risk of a collision for the next 100-plus years. In the end, Janus fell victim to the delay of the Psyche mission and tight budget constraints at NASA. The agency said Tuesday it has directed the Janus team to "prepare the spacecraft for long-term storage."

NASA has expanded its contracts with Axiom Space and Collins Aerospace to design and develop new spacesuits, providing each company with an additional $5 million. Engadget reports: NASA has ordered a spacesuit from Axiom Space meant for use in Low Earth Orbit, specifically for spacewalks outside the International Space Station. The original contract for Axiom was for a spacewalking system that the Artemis III astronauts will wear on the lunar surface when they land on the moon. Axiom unveiled a prototype for its original order in March, showcasing a suit with joints that allow wearers to move around with ease and a helmet equipped with a light and an HD camera. Meanwhile, Collins Aerospace has received an order for a spacesuit meant for use on the lunar surface. The company was previously contracted to develop a spacewalking suit for use outside the ISS. In other words, each company has received a new order that mirrors the other's previous one.

Redundancy is an important part of space tech development. In this case, spacesuits meant for the same purpose developed by two different companies could ensure that astronauts will have something to use if the other one fails for any reason. That said, the new task orders are for the companies' initial "design modification work" -- they're essentially modifying their original suits for a new purpose -- and NASA wants to see them first before committing to their continued development. Axiom told SpaceNews that if NASA decides to push through with the new spacesuits' development, the full order will cost the agency $142 million over four years.

Blue Origin's BE-4 rocket engine exploded during testing, causing significant damage and potential delays to the company's rocket launches, including those for its customer United Launch Alliance (ULA). CNBC reports: During a firing on June 30 at a West Texas facility of Jeff Bezos' space company, a BE-4 engine detonated about 10 seconds into the test, according to several people familiar with the matter. Those people described having seen video of a dramatic explosion that destroyed the engine and heavily damaged the test stand infrastructure. The engine that exploded was expected to finish testing in July. It was then scheduled to ship to Blue Origin's customer United Launch Alliance for use on ULA's second Vulcan rocket launch, those people said.

A Blue Origin spokesperson, in a statement to CNBC on Tuesday, confirmed the company "ran into an issue while testing Vulcan's Flight Engine 3." "No personnel were injured and we are currently assessing root cause," Blue Origin said, adding "we already have proximate cause and are working on remedial actions." The company noted it "immediately" made its customer ULA aware of the incident. ULA is the rocket-building joint venture of Boeing and Lockheed Martin, which competes primarily with Elon Musk's SpaceX, especially going head-to-head over the most lucrative military launch contracts. Blue Origin also said it will be able to "continue testing" engines in West Texas. The company previously built two stands for the tests. "We will be able to meet our engine delivery commitments this year and stay ahead of our customer's launch needs," Blue Origin added.

BE-4âs test failure threatens to further push back the already-delayed first Vulcan launch -- which was recently rescheduled to the fourth quarter of this year -- while Blue Origin examines the cause of the problem. Each Vulcan rocket uses a pair of BE-4 engines to launch. ULA waited anxiously for years to receive delivery of the first set. A month ago, ULA completed a key milestone in preparation for the first Vulcan launch, known as Cert-1, with a short static fire test of the rocket using the first pair of BE-4 flight engines. [...] At the same time that Blue Origin needs to get BE-4 working well and humming off the production line for its main customer, the company also needs the engines for its own reusable New Glenn rocket that's in development. While Vulcan uses two BE-4 engines, each New Glenn rocket requires seven BE-4 engines, meaning Blue Origin needs to produce dozens a year to support both rockets.

Cancer cells-to-be accumulate a series of specific genetic changes in a predictable and sequential way years before they are identifiable as pre-malignancies, researchers at Stanford Medicine have found. Stanford Medicine blog: Many of these changes affect pathways that control cell division, structure and internal messaging -- leaving the cells poised to go bad long before any visible signs or symptoms occur. The study is the first to exhaustively observe the natural evolution of the earliest stages of human cancers, starting with cells that have a single cancer-priming mutation and culminating with a panel of descendants harboring a galaxy of genetic abnormalities.

Identifying the first steps associated with future cancer development could not only facilitate earlier-than-ever diagnosis -- when a deadly outcome is but a twinkle in a rogue cell's eye -- but may also highlight novel interventions that could stop the disease in its tracks, the researchers say. "Ideally, we would find ways to intercept this progression before the cells become truly cancerous," said Christina Curtis, PhD, professor of medicine, of genetics and of biomedical data science. "Can we identify a minimal constellation of genetic alterations that imply the cell will progress? And, if so, can we intervene? The striking reproducibility in the genetic changes we observed from multiple donors suggests it's possible."

Birds have never shied away from turning human rubbish into nesting materials, but even experts in the field have raised an eyebrow at the latest handiwork to emerge from urban crows and magpies. From a report: Nests recovered from trees in Rotterdam in the Netherlands and Antwerp in Belgium were found to be constructed almost entirely from strips of long metal spikes that are often attached to buildings to deter birds from setting up home on the structures.

The discovery prompted researchers at the Natural History Museum in Rotterdam and the Naturalis Biodiversity Center in Leiden to scour the internet for further examples, leading to the identification of two more anti-bird spike nests: one in Enschede in the Netherlands and another in Glasgow. "I really thought I'd seen it all," said Kees Moeliker, the director of the Natural History Museum Rotterdam, who studied the crow's nest found during tree maintenance near the city's main railway station. "I didn't expect this. These anti-bird spikes are meant to deter birds, they are supposed to scare them off, but on the contrary, the birds just utilise them."

While the Rotterdam nest was made by crows, the other three were built by magpies, which construct large dome-like nests. The crows used the anti-bird spikes as a sturdy construction material, but the magpies may have appreciated their intended use: they placed most of the spikes on the nest's roof where they could deter predators, including other birds and weasels. [...] It is not the first time birds have been found to incorporate urban materials into their nests. In 1933, a South African museum reported a crow's nest fashioned from hard-drawn copper, galvanised iron and barbed wire. Nails, screws and even drug users' syringes have all found their way into birds' nests.

An anonymous reader quotes a report from Gizmodo: Disgraced Theranos co-founder Elizabeth Holmes' prison sentence has been reduced by two years, according to the Bureau of Prisons records. Holmes was sentenced to 11 years and three months in prison for defrauding investors by claiming her blood-testing company provided quick and reliable results but she was found to have lied about the reliability of those tests. Holmes surrendered to the Bureau of Prisons in California on May 30 to serve out her sentence at a minimum-security all-female federal prison camp in Bryan, Texas.

Less than two months after she reported to prison, her sentence was quietly changed, with her new release date scheduled for December 29, 2032, the Bureau's site says. The Bureau has not provided additional information for why Holmes' projected release date was shortened, but its site says an inmate's good behavior, substance abuse program completion, and time credits they receive for activities and programs they've completed can result in a lessened sentence. Only last month, Theranos' former president and chief operating officer Ramesh "Sunny" Balwani's 13-year sentence was likewise reduced by two years, making his new projected release date April 11, 2034.

Holmes is serving out her remaining nine-year sentence at FPC Bryan, an all-female prison camp, where the women adhere to a strict schedule requiring them to begin work at 6 a.m. each day. Those who are considered eligible to work are assigned jobs earning between 12 cents and $1.15 an hour in roles like food service and factory employment.

Popular Science describes how NASA's Volatiles Investigating Polar Exploration Rover (VIPER) will use a pair of ramps to become the first rover to explore the Moon's south pole when it arrives in late 2024. From the report: "We all know how to work with ramps, and we just need to optimize it for the environment we're going to be in," says NASA's VIPER program manager Daniel Andrews. A VIPER test vehicle recently descended down a pair of metal ramps at NASA's Ames Research Center in California, as seen in the agency's recently published photos, with one beam for each set of the rover's wheels. Because the terrain where VIPER will land -- the edge of the massive Nobile Crater -- is expected to be rough, the engineering team has been testing VIPER's ability to descend the ramps at extreme angles. They have altered the steepness, as measured from the lander VIPER will descend from, and differences in elevation between the ramp for each wheel. "We have two ramps, not just for the left and right wheels, but a ramp set that goes out the back too," Andrews says. "So we actually get our pick of the litter, which one looks most safe and best to navigate as we're at that moment where we have to roll off the lander."

VIPER is a scientific successor to NASA's Lunar Crater Observation and Sensing Satellite, or LCROSS mission, which in 2009 confirmed the presence of water ice on the lunar south pole. "It completely rewrote the books on the moon with respect to water," says Andrews, who also worked on the LCROSS mission. "That really started the moon rush, commercially, and by state actors like NASA and other space agencies." The ice, if abundant, could be mined to create rocket propellant. It could also provide water for other purposes at long-term lunar habitats, which NASA plans to construct in the late 2020s as part of the Artemis moon program.

But LCROSS only confirmed that ice was definitely present in a single crater at the moon's south pole. VIPER, a mobile rover, will probe the distribution of water ice in greater detail. Drilling beneath the lunar surface is one task. Another is to move into steep, permanently shadowed regions -- entering craters that, due to their sharp geometry, and the low angle of the sun at the lunar poles, have not seen sunlight in billions of years. The tests demonstrate the rover can navigate a 15-degree slope with ease -- enough to explore these hidden dark spots, avoiding the need to make a machine designed for trickier descents. "We think there's plenty of scientifically relevant opportunities, without having to make a superheroic rover that can do crazy things," Andrews says.

Developed by NASA Ames and Pittsburgh-based company Astrobotic, VIPER is a square golf-cart-sized vehicle about 5 feet long and wide, and about 8 feet high. Unlike all of NASA's Mars rovers, VIPER has four wheels, not six. "A problem with six wheels is it creates kind of the equivalent of a track, and so you're forced to drive in a certain way," Andrews says. VIPER's four wheels are entirely independent from each other. Not only can they roll in any direction, they can be turned out, using the rover's shoulder-like joints to crawl out of the soft regolith of the kind scientists believe exists in permanently shadowed moon craters. The wheels themselves are very similar to those on the Mars rovers, but with more paddle-like treads, known as grousers, to carry the robot through fluffy regolith. [...] Together with Astrobotic, Andrews and his team have altered the ramps, and they now include specialized etchings down their lengths. The rover can detect this pattern along the rampway, using cameras in its wheel wells. "By just looking down there," the robot knows where it is, he says. "That's a new touch." Andrews is sure VIPER will be ready for deployment in 2024, however many tweaks are necessary. After all, this method is less complicated than a sky crane, he notes: "Ramps are pretty tried and true."

An anonymous reader quotes a report from the New York Times: The hush at the end of the musical performance. The pause in a dramatic speech. The muted moment when you turn off the car. What is it that we hear when we hear nothing at all? Are we detecting silence? Or are we just hearing nothing and interpreting that absence as silence? The "Sound of Silence" is a philosophical question that made for one of Simon & Garfunkel's most enduring songs, but it's also a subject that can be tested by psychologists. In a paper published Monday in the Proceedings of the National Academy of Sciences, researchers used a series of sonic illusions to show that people perceive silences much as they hear sounds. While the study offers no insight into how our brains might be processing silence, the results suggest that people perceive silence as its own type of "sound," not just as a gap between noises.

The researchers tested people recruited online with a series of sound illusions. The first test compared a single longer sound with two shorter sounds. The two shorter sounds together added up to the same amount of time as the longer sound. But when people listened to them, they perceived the single sound as lasting longer. To apply that illusion to silence, [Rui Zhe Goh, a graduate student in cognitive science and philosophy at Johns Hopkins University] and colleagues inverted the test. The scientists used sounds of restaurants, busy marketplaces, trains or playgrounds, and inserted chunks of silence for participants to compare.

The researchers supposed that if people perceive silences as their own type of sound, then silences should be subject to the same illusion as the sounds. One long silence should be perceived as longer than the total of two shorter silences. But if people perceive silence as a lack of sound, the illusion might not exist. Other tests placed silence in different contexts to produce more sonic illusions. In every case they tested, listeners perceived the illusion of a period of silence being longer just as they would have perceived an illusion of a longer sound. [...] Although the researchers did not study how people's brains responded to silence, Mr. Goh suggested that existing research supported the idea that some neurons and neural processes were involved in the perception of silence. And knowing that we do perceive silence makes silence that much, er, louder: "Silence is a real experience," Mr. Goh said. Maybe we'll all pay more attention to moments of quiet once we know we can hear the "sounds" of silence.

According to the Wall Street Journal, Google is testing its Med-PaLM 2 AI chat technology at the Mayo Clinic and other hospitals. It's based on the company's PaLM 2 large language model (LLM) that underpins Bard, Google's ChatGPT rival. Engadget reports: Unlike the base model, Med-PaLM-2 has been trained on questions and answer from medical licensing exams, along with a curated set of medical expert demonstrations. That gives it expertise in answering health-related questions, and it can also do labor-intensive tasks like summarizing documents and organizing research data, according to the report. During I/O, Google released (PDF) a paper detailing its work on Med-PaLM2. On the positive side, it demonstrated features like "alignment with medical consensus," reasoning ability, and even the ability to generate answers that were preferred by respondents over physician-generated responses. More negatively, it showed the same accuracy problems we've seen on other Chat AI models.

In an internal email seen by the WSJ, Google said it believes the updated model could "be of tremendous value in countries that have more limited access to doctors." Still, Google has admitted that the technology is still in its early stages. "I don't feel that this kind of technology is yet at a place where I would want it in my family's healthcare journey," said Google senior research director Greg Corrado. However, he added that the tech "takes the places in healthcare where AI can be beneficial and expands them by 10-fold."

The booster just touched down on the droneship. "The Falcon 9 first-stage has now successfully launched and landed for a record-breaking 16th time," announced SpaceX's feed on YouTube. It was also SpaceX's 206th landing of an orbital-class rocket.

Long-time Slashdot reader Amiga Trombone quotes Spaceflight Now on how SpaceX tested "the limits of its reusable Falcon 9 rocket on Sunday evening." The booster, tail number 1058, made its historic debut on May 20, 2020, carrying the first astronauts to ride atop a Falcon 9 aboard the Crew Dragon capsule Endeavour. The first stage is distinctive in the SpaceX fleet as it is the only one to display a red NASA "worm" logo on its fuselage. It went on to fly 14 more times, including the launches of South Korea's Anasis 2 military communications satellite, a space station cargo delivery run, two Transporter ride-share missions and ten batches of Starlink satellites. With 15 flights already accomplished, it is the joint fleet leader with booster 1060.

Originally, the company hoped to reuse each Falcon 9 first stage 10 times.

"We got to 10 [flights] and the vehicles were still looking really good, so we started the effort to qualify for 15," Jon Edwards, SpaceX vice president of Falcon launch vehicles and Falcon engineering, told the trade publication Aviation Week & Space Technology in an interview last year.

SpaceX is now further pushing the envelope by going beyond the previously certified limit of 15 flights. It has been over 200 days since booster 1058 last flew. During that time it is likely SpaceX conducted extensive inspections and refurbishment work to clear the rocket for additional launches.

For its 16th ride to space, booster 1058 will carry 22 second-generation Starlink 'V2 mini' satellites into orbit, on a mission designated Starlink 6-5.