Air pollution may affect semen quality, specifically sperm motility -- the ability of sperm to swim in the right direction -- according to a new study analysing the sperm of over 30,000 men in China. From a report: The research, published today in the journal JAMA Networks, also suggests that the smaller the size of the polluting particles in the air, the greater the link with poor semen quality. "Our findings suggest that smaller particulate matter size fractions may be more potent than larger fractions in inducing poor sperm motility," wrote the authors of the paper. The researchers believe that these findings highlight yet another reason for the need to reduce exposure to air pollution among men in their reproductive age.

An anonymous reader quotes a report from Motherboard: [S]cientists at JILA, a joint operation between the National Institute of Standards and Technology and the University of Colorado Boulder, have measured time dilation at the smallest scale ever using the most accurate clocks in the world. The team showed that clocks located just a millimeter apart -- about the width of a pencil tip -- showed slightly different times due to the influence of Earth's gravity. The new experiment paves the way toward clocks with 50 times the precision of those available today, which could be used for a host of practical applications, while also shedding light on fundamental mysteries about our universe, including the long-sought "union of general relativity and quantum mechanics," according to a study published on Wednesday in Nature.

In 2010, JILA scientists used these clocks to measure time dilation at two points with a difference in elevation of 33 centimeters (roughly a foot), which was a big advance at that point. After a decade of fine-tuning their clocks, [Jun Ye, a JILA physicist who co-authored the study] and his colleagues have managed to track frequency shifts within a sample of 100,000 extremely cold strontium atoms, enabling them to snag the unprecedented millimeter-scale effects of dilation. What's more, the team managed to keep these atoms dancing in perfect unison for 37 seconds, setting a new record for the duration of "quantum coherence," or the state in which the behavior of these atoms can be predicted.

Virgin Galactic announced that it's opening ticket sales to the general public for its spaceflight system, "letting you become an astronaut if you're willing to pay $450,000 and put down a $150,000 deposit," reports Engadget. From the report: For that $450K, you'll get a 90-minute ride to the edge of space including the "signature air launch and Mach-3 boost to space," the company said. Passengers will enjoy several minutes of weightlessness and spectacular views of Earth from the 17 windows, as it showed in a new video (below). The ticket also includes several days of astronaut training, a fitted Under Armour spacesuit, and membership in the Future Astronaut community. All flights launch from Spaceport America in New Mexico.

"We plan to have our first 1,000 customers on board at the start of commercial service later this year, providing an incredibly strong foundation as we begin regular operations and scale our fleet," said Virgin Galactic CEO Michael Colglazier in a statement. As of late last year, the company had sold 100 tickets to space at the updated $450,000 ticket price. Around 700 people, including Elon Musk, have made reservations.

An anonymous reader quotes a report from Reuters: A U.S. patient with leukemia has become the first woman and the third person to date to be cured of HIV after receiving a stem cell transplant from a donor who was naturally resistant to the virus that causes AIDS, researchers reported on Tuesday. The case of a middle-aged woman of mixed race, presented at the Conference on Retroviruses and Opportunistic Infections in Denver, is also the first involving umbilical cord blood, a newer approach that may make the treatment available to more people. Since receiving the cord blood to treat her acute myeloid leukemia -- a cancer that starts in blood-forming cells in the bone marrow -- the woman has been in remission and free of the virus for 14 months, without the need for potent HIV treatments known as antiretroviral therapy. The two prior cases occurred in males -- one white and one Latino -- who had received adult stem cells, which are more frequently used in bone marrow transplants.

"This is now the third report of a cure in this setting, and the first in a woman living with HIV," Sharon Lewin, President-Elect of the International AIDS Society, said in a statement. The case is part of a larger U.S.-backed study led by Dr. Yvonne Bryson of the University of California Los Angeles (UCLA), and Dr. Deborah Persaud of Johns Hopkins University in Baltimore. It aims to follow 25 people with HIV who undergo a transplant with stem cells taken from umbilical cord blood for the treatment of cancer and other serious conditions.

NASA, in a blog post: Coastal flooding will increase significantly over the next 30 years because of sea level rise, according to a new report by an interagency sea level rise task force that includes NASA, the National Oceanic and Atmospheric Administration (NOAA), and other federal agencies. Titled Global and Regional Sea Level Rise Scenarios for the United States, the Feb. 15 report concludes that sea level along U.S. coastlines will rise between 10 to 12 inches (25 to 30 centimeters) on average above today's levels by 2050. The report -- an update to a 2017 report -- forecasts sea level to the year 2150 and, for the first time, offers near-term projections for the next 30 years. Agencies at the federal, state, and local levels use these reports to inform their plans on anticipating and coping with the effects of sea level rise.

"This report supports previous studies and confirms what we have long known: Sea levels are continuing to rise at an alarming rate, endangering communities around the world. Science is indisputable and urgent action is required to mitigate a climate crisis that is well underway," said NASA Administrator Bill Nelson. "NASA is steadfast in our commitment to protecting our home planet by expanding our monitoring capabilities and continuing to ensure our climate data is not only accessible but understandable." The task force developed their near-term sea level rise projections by drawing on an improved understanding of how the processes that contribute to rising seas -- such as melting glaciers and ice sheets as well as complex interactions between ocean, land, and ice -- will affect ocean height. "That understanding has really advanced since the 2017 report, which gave us more certainty over how much sea level rise we'll get in the coming decades," said Ben Hamlington, a research scientist at NASA's Jet Propulsion Laboratory in Southern California and one of the update's lead authors.

NASA's Sea Level Change Team, led by Hamlington, has also developed an online mapping tool to visualize the report's state-of-the-art sea level rise projections on a localized level across the U.S. "The hope is that the online tool will help make the information as widely accessible as possible," Hamlington said. The Interagency Sea Level Rise Task Force projects an uptick in the frequency and intensity of high-tide coastal flooding, otherwise known as nuisance flooding, because of higher sea level. It also notes that if greenhouse gas emissions continue to increase, global temperatures will become even greater, leading to a greater likelihood that sea level rise by the end of the century will exceed the projections in the 2022 update.

A distant white dwarf is surrounded by space rocks marching in perfect time. This observation offers hints of what may be the first planet we have detected in the habitable zone of one of these stellar corpses, suggesting that they might be just as good for life as bigger, younger stars. From a report: "A lot of people think of a white dwarf as a dead system or a dead end, but this tells us that there is a lot of stuff going on around white dwarfs," says Jay Farihi at University College London. He and his colleagues spotted these hints while observing a star called WD 1054-226, which lies about 118 light years away, using several powerful telescopes. They found that something appeared to be regularly passing in front of the star, causing dips in its light. The biggest dip happened every 23.1 minutes, in a pattern that repeated every 25 hours.The measurements indicate, the report says, that the star is surrounded by a ring of 65 comet-sized or moon-sized objects, remarkably evenly spaced in their orbits.

schwit1 shares a report from Politico: Starship is threatening NASA's moon contractors, which are watching its progress with a mix of awe and horror. "They are shitting the bed," said a top Washington space lobbyist who works for SpaceX's competitors and asked for anonymity to avoid upsetting his clients. NASA and its major industry partners are simultaneously scrambling to complete their own moon vehicles: the Space Launch System mega-rocket and companion Orion capsule. But the program is billions of dollars over budget and years behind schedule -- and, many would argue, generations behind SpaceX in innovation.

The space agency's first three Artemis moon missions over the next three years -- including a human landing planned for 2025 -- are all set to travel aboard the SLS rocket and Orion capsule, which are being built by Boeing, Lockheed Martin, Northrop Grumman, Aerojet Rocketdyne and numerous other suppliers and engineering services firms. But with the SLS' first flight this year further delayed at least until late spring, concerns are growing that even if it succeeds, the system, at an estimated $2 billion per launch, could prove too costly for the multiple journeys to the moon that NASA will need to build a permanent human presence on the lunar surface.

That makes Starship, which conducted a successful flight to the edge of space last year, especially threatening to the contractors and their allies in Congress. As Starship progresses, it will further eclipse the argument for sticking with SLS, according to Rand Simberg, an aerospace engineer and space consultant. "Once the new system's reliability is demonstrated with a large number of flights, which could happen in a matter of months, it will obsolesce all existing launch systems," he said. "If SLS is not going to fly more than once every couple of years, it's just not going to be a significant player in the future in space, particularly when Starship is flown," he added.

An anonymous reader quotes a report from the New York Times: On March 4, a human-made piece of rocket detritus will slam into the moon. But it turns out that it is not, as was previously stated in a number of reports, including by The New York Times, Elon Musk's SpaceX that will be responsible for making a crater on the lunar surface. Instead, the cause is likely to be a piece of a rocket launched by China's space agency.

Last month, Bill Gray, developer of Project Pluto, a suite of astronomical software used to calculate the orbits of asteroids and comets, announced that the upper stage of a SpaceX Falcon 9 rocket was on a trajectory that would intersect with the path of the moon. [...] But an email on Saturday from Jon Giorgini, an engineer at NASA's Jet Propulsion Laboratory in California, changed the story. Mr. Giorgini runs Horizons, an online database that can generate locations and orbits for the almost 1.2 million objects in the solar system, including about 200 spacecraft. A user of Horizons asked Mr. Giorgini how certain it was that the object was part of the DSCOVR rocket. "That prompted me to look into the case," Mr. Giorgini said.

Part of a rocket is expected to crash into the far side of the moon on March 4. Initially thought to be a SpaceX rocket stage, the object may actually be part of a Long March 3C rocket [that launched China's Chang'e-5 T1 spacecraft on Oct. 23, 2014]. He found that the orbit was incompatible with the trajectory that DSCOVR took, and contacted Mr. Gray. [...] Mr. Gray now realizes that his mistake was thinking that DSCOVR was launched on a trajectory toward the moon and using its gravity to swing the spacecraft to its final destination about a million miles from Earth where the spacecraft provides warning of incoming solar storms. But, as Mr. Giorgini pointed out, DSCOVR was actually launched on a direct path that did not go past the moon. "I really wish that I had reviewed that" before putting out his January announcement, Mr. Gray said. "But yeah, once Jon Giorgini pointed it out, it became pretty clear that I had really gotten it wrong." There is still no chance of the rocket missing the moon, the report says.

"As for what happened to that Falcon 9 part, 'we're still trying to figure out where the DSCOVR second stage might be,' Mr. Gray said," according to the Times. "The best guess is that it ended up in orbit around the sun instead of the Earth, and it could still be out there. That would put it out of view for now."

joshuark shares a report from Popular Mechanics: A mathematician from Harvard University has (mostly) solved a 150-year-old Queen's gambit of sorts: the delightful n queens puzzle. In newly self-published research (meaning it has not yet been peer-reviewed), Michael Simkin, a postdoctoral fellow at Harvard's Center of Mathematical Sciences and Applications, estimated the solution to the thorny math problem, which is based loosely on the rules of chess. The queen is largely understood to be the most powerful piece on the board because she can move in any direction, including diagonals. So how many queens can fit on the chess board without falling into each other's paths? The logic at play here is similar to a sudoku puzzle, dotting queens on the board so that they don't intersect.

Picture a classic chess board, which is an eight-by-eight matrix of squares. The most well-known version of the puzzle matches the board because it involves eight queens -- and there are 92 solutions in this case. But the "n queens problem" doesn't stop there; that's because its nature is asymptotic, meaning its answers approach an undefined value that reaches for the infinite. Up until now, experts have explicitly solved for all the natural numbers (the counting numbers) up to 27 queens in a 27-by-27 board. However, there is no solution for two or three, because there's no possible positioning of queens that satisfies the criteria. But what about numbers above 27?

Consider this: for eight queens, there are just 92 solutions, but for 27 queens, there are over 200 quadrillion solutions. It's easy to see how solving the problem for numbers higher than 27 becomes extremely unwieldy or even impossible without more computing power than we have at the moment. That's where Simkin's work enters the arena. His work approached the topic through a sharp mathematical estimate of the number of solutions as n increases. Ultimately, he arrived at the following formula: (0.143n)n. In other words, there are approximately (0.143n)n ways that you can place the queens so that none are attacking one another on an n-by-n chessboard.

Shrunk reservoirs. Depleted aquifers. Low rivers. Raging wildfires. It's no secret that the Western U.S. is in a severe drought. New research published Monday shows just how extreme the situation has become. NPR: The Western U.S. and Northern Mexico are experiencing their driest period in at least 1,200 years, according to the new study published in the journal Nature Climate Change. The last comparable -- though not as severe -- multi-decade megadrought occurred in the 1500s, when the West was still largely inhabited by American Indian tribes. Today, the region is home to tens of millions of people, massive agricultural centers and some of the fastest-growing cities in the U.S. -- all in an area where there's less water available than there was in the past, partially due to human-caused climate change.

"We have a society that's relying on there being the amount of water there was in the 1900's," said the study's lead author Park Williams, a bioclimatologist at the University of California, Los Angeles. "But now with the number of water molecules available to us declining, it really is time for us to get real about how much water there is for us to use." Williams looked at tree-ring data from thousands of sites to conduct the research. They sampled data collected from live trees, dead trees and wood beams preserved at Native American archeological sites. The tree rings gave Williams an insight into drought events dating back to the year 800 AD, around the same time Charlemagne was being crowned Emperor of Rome. He identified four other megadroughts in that time period, the most notable being a 23-year drought that ended in the late 1500's. There were hopes during a wet 2019 that the current megadrought was following a similar pattern, Williams said. "And then from summer 2020 through all of 2021, it was just exceptionally dry across the West...indicating that this drought is nowhere near done."

"A new museum exhibit hopes to uncover the secrets behind the doodles, in-jokes and coded messages on a blackboard that legendary physicist Stephen Hawking kept untouched for more than 35 years," reports Live Science: The blackboard dates from 1980, when Hawking joined fellow physicists at a conference on superspace and supergravity at the University of Cambridge in the U.K., according to The Guardian. While attempting to come up with a cosmological "theory of everything" — a set of equations that would combine the rules of general relativity and quantum mechanics — Hawking's colleagues used the blackboard as a welcome distraction, filling it with a mishmash of half-finished equations, perplexing puns and inscrutable doodles.

Still preserved more than 40 years later, the befuddling blackboard has just gone on public display for the first time ever as the centerpiece of a new exhibition on Hawking's office, which opened Feb. 10 at the Science Museum of London. The museum will welcome physicists and friends of Hawking — who died in 2018 at the age of 76 — from around the world in hopes that they may be able to decipher some of the hand-scrawled doodles.

What, for example, does "stupor symmetry" mean? Who is the shaggy-bearded Martian drawn large at the blackboard's center? Why is there a floppy-nosed squid climbing over a brick wall? What is hiding inside the tin can labeled "Exxon supergravity?" Hopefully, the world's great minds of math and physics can rise to the occasion with answers.
The exhibit includes dozens of other Hawking artifacts, including a formal bet that information swallowed by a black hole is lost for ever and a copy of his 1966 Ph.D. thesis on the expansion of the universe. The exhibt runs through June 12th at the Science Museum in London before touring other museums around the U.K.

The first images from NASA's James Webb Space Telescope have been released, according to Space.com. Slashdot readers g01d4 and fahrbot-bot first shared the news. From the report: The main photo, which doesn't even hint at the power Webb will bring to the universe once it's fully operational, shows a star called HD 84406 and is only a portion of the mosaic taken over 25 hours beginning on Feb. 2, during the ongoing process to align the observatory's segmented mirror. "The entire Webb team is ecstatic at how well the first steps of taking images and aligning the telescope are proceeding," Marcia Rieke, principal investigator of the instrument that Webb relies on for the alignment procedure and an astronomer at the University of Arizona, said in a NASA statement.

JWST is now 48 days out from its Christmas Day launch and in the midst of a commissioning process expected to last about six months. The telescope spent the first month unfolding from its launch configuration and trekking out nearly 1 million miles (1.5 million kilometers) away from Earth. During the bulk of the remaining time, scientists are focusing on waking and calibrating the observatory's instruments and making the minute adjustments to the telescope's 18 golden mirror segments that are necessary for crisp, clear images of the deep universe. The process is going well, according to NASA.

Still, the telescope has a long way to go, as today's image of HD 84406 shows. [...] HD 84406 is in the constellation Ursa Major, or Big Bear, but is not visible from Earth without a telescope. But it was a perfect early target for Webb because its brightness is steady and the observatory can always spot it, so launch or deployment delays wouldn't affect the plan. Oddly, JWST won't be able to observe HD 84406 later in its tenure; once the telescope is focused, this star will be too bright to look at. Previously, JWST personnel have said that the telescope will be seeing fairly sharply by late April. In addition to the image of HD 84406, NASA also shared a "selfie" image, which Gizmodo and CNN decided to focus on in their reports.

This true story of a hammer, a feather, the Apollo 15 mission, and the answers to humanity's oldest questions about how stuff falls. From a report: Does a falling object move at a constant speed, or does it speed up? If you drop a heavy object and a light one at the same time, which will fall faster? The great thing about these two questions is that you can ask pretty much anyone and they will have an answer -- even if they are actually wrong. The even greater thing is that it's fairly simple to determine the answers experimentally. [...] OK, but what about dropping a rock and feather -- doesn't the rock hit first? Usually, the answer is yes. But let's replace the rock with a hammer and then just take a change of scenery and move the experiment to the moon. This is exactly what happened during the Apollo 15 lunar mission in 1971. Commander David Scott took a hammer and an eagle feather and dropped them onto the lunar regolith. Here's what happened: The feather and the hammer hit the ground at the same time.

Why did it happen? First, it is indeed true that even on the moon there is a greater gravitational force on the hammer than the feather. We can calculate this gravitational force as the product of mass (m in kilograms) and the gravitational field (g in newtons per kilogram). On the surface of the moon, the gravitational field has a value of 1.6 N/kg. If you put this expression in for the net force on a falling object, it looks like this: Fnet = - mg = ma; a = -g. Since both the gravitational force and the acceleration depend on the same mass, it's on both sides of the equation and cancels. That leaves an acceleration of -g. The hammer and the feather fall down with identical motions and hit the ground at the same time.

So, what's different about dropping something on the moon versus on Earth? Yes, there is a different gravitational weight on the moon -- but that's not the issue. It's the lack of air that makes the difference. Remember that Newton's second law is a relationship between the net force and the acceleration. If you drop a feather on the surface of the Earth, there are two forces acting on it. First, there is the downward-pulling gravitational force that is equal to the product of mass and the gravitational field. Second, there is an upward-pushing force due to the interaction with the air, which we often call air drag. This air drag force depends on several things, but the important ones are the object's speed and the size of the object. [...]

People who develop Alzheimer's disease can experience sleep disturbances years before the condition takes hold, but whether one causes the other, or something more complex is afoot, has always proved hard for scientists to determine. From a report: Now, researchers in the US have shed light on the mystery, in work that raises hopes for new therapies, and how "good sleep hygiene" could help to tackle the disease and its symptoms. The findings show that humans' 24-hour circadian clock controls the brain's ability to mop up wayward proteins linked to Alzheimer's disease. If the scientists are right, the work would explain, at least in part, how disruption to circadian rhythms and sleep disturbances might feed into the onset and progression of Alzheimer's disease, and how preventing such disruption might stave off the condition.

"Circadian disruption is correlated with Alzheimer's diagnosis and it has been suggested that sleep disruptions could be an early warning sign of Alzheimer's disease," said Dr Jennifer Hurley, who led the research at Rensselaer Polytechnic Institute, in New York. Alzheimer's takes hold when connections are lost between nerve cells in the brain. The disease is progressive and linked to abnormal plaques and tangles of proteins that steadily build up in the brain. The disease is the most common cause of dementia and affects more than half a million people in the UK, a figure that is set to rise. To keep the brain healthy, immune cells called microglia seek out and destroy troublesome proteins that threaten to accumulate in the brain. One type of protein targeted by the cells is called amyloid beta, a hallmark of Alzheimer's.

An anonymous reader quotes a report from NPR: Scientists have built a school of robotic fish powered by human heart cells. The fish, which swim on their own, show how lab-grown heart tissue can be designed to maintain a rhythmic beat indefinitely, a team reports in the journal Science. "It's a training exercise," says Kit Parker, a professor of bioengineering and applied physics at Harvard. "Ultimately, I want to build a heart for a sick kid."

The tiny biohybrids, based on zebrafish, are built from paper, plastic, gelatin and two strips of living heart muscle cells. One strip runs along the left side of the robot's body, the other along the right. When the muscle cells on one side contract, the tail moves in that direction, propelling the fish through the water. The movement also causes the strip of muscle cells on the opposite side to stretch. This stretching, in turn, produces a signal that causes the cells to contract, which perpetuates the swimming motion. "Once that cycle starts, these things just start motoring," Parker says.

The fish are equipped with a special cluster of cells that initiate the cycle of stretching and contracting, Parker says. [...] The fish kept swimming for more than three months, sustained by nutrients added to the fluid around them. Showing that it's possible to produce human heart tissue that beats on its own is important because the body can't replace heart cells lost to disease or inflammation. "Once you're born, about two days after you leave the womb, the number of cardiac muscle cells you have then is all you're going to have for the rest of your life," Parker says. [...] Heart cells stay healthy by constantly rebuilding themselves, a process that takes about 20 days, he says. Because the fish swam for more than 100 days, he says, "each cell has rebuilt itself in there about five times." The muscle cells also became stronger with exercise the way cells in a human heart do. This suggests the cells could eventually be used to repair a failing heart.

The first operational launch of Astra's Rocket 3.3 vehicle failed Feb. 10 when the rocket's upper stage appeared to tumble out of control after stage separation. SpaceNews reports: The rocket, designated LV0008 by Astra, lifted off from Space Launch Complex 46 at Cape Canaveral Space Force Station at 3 p.m. Eastern. The launch suffered several days of delays because of a range issue as well as a last-second scrub during the previous launch attempt Feb. 7. However, onboard video of the vehicle showed the upper stage tumbling shortly after separation from the first stage, three minutes after liftoff. The video suggests a potential issue with the separation of the payload fairing, which, according to a mission timeline provided by the company, takes place seconds before stage separation.

This was the fifth orbital launch attempt by Astra of its Rocket 3 vehicle. The first three launches, from September 2020 through August 2021, all failed to reach orbit. The fourth, in November 2021, did reach orbit but did not carry a satellite payload. This launch was carrying four NASA-sponsored cubesats on a mission called Educational Launch of Nanosatellites (ELaNa) 41 by NASA. The agency awarded Astra a $3.9 million contract in December 2020 for the launch through its Venture Class Launch Services (VCLS) Demo 2 competition. "An issue has been experienced during flight that prevented the delivery of our customer payloads to orbit today. We are deeply sorry to our customers," said Carolina Grossman, director of product management at Astra, during the launch webcast. The company did not disclose any additional information about the failure. "I'm with the team looking at data, and we will provide more info as soon as we can," Chris Kemp, chief executive of Astra, tweeted minutes after the failure.

An anonymous reader quotes a report from the New York Times: Luc Montagnier, a French virologist who shared a Nobel Prize for discovering the virus that causes AIDS, died on Tuesday in the Paris suburb of Neuilly-sur-Seine. He was 89. [...] The discovery of H.I.V. began in Paris on Jan. 3, 1983. That was the day that Dr. Montagnier (pronounced mon-tan-YAY), who directed the Viral Oncology Unit at the Pasteur Institute, received a piece of lymph node that had been removed from a 33-year-old man with AIDS. Dr. Willy Rozenbaum, the patient's doctor, wanted the specimen to be examined by Dr. Montagnier, an expert in retroviruses. At that point, AIDS had no known cause, no diagnostic tests and no effective treatments. Many doctors, though, suspected that the disease was triggered by a retrovirus, a kind of germ that slips into the host cell's DNA and takes control, in a reversal of the way viruses typically work; hence the name retro. From this sample Dr. Montagnier's team spotted the culprit, a retrovirus that had never been seen before. They named it L.A.V., for lymphadenopathy associated virus.

The Pasteur scientists, including Dr. Francoise Barre-Sinoussi, who later shared the Nobel with Dr. Montagnier, reported their landmark finding in the May 20, 1983, issue of the journal Science, concluding that further studies were necessary to prove L.A.V. caused AIDS. The following year, the laboratory run by the American researcher Dr. Robert Gallo, at the National Institutes of Health, published four articles in one issue of Science confirming the link between a retrovirus and AIDS (for acquired immune deficiency syndrome). Dr. Gallo called his virus H.T.L.V.-III. There was some initial confusion as to whether the Montagnier team and the Gallo team had found the same virus or two different ones. When the two samples were found to have come from the same patient, scientists questioned whether Dr. Gallo had accidentally or deliberately got the virus from the Pasteur Institute. And what had once been camaraderie between those two leading scientists exploded into a global public feud, spilling out of scientific circles into the mainstream press. Arguments over the true discoverer and patent rights stunned a public that, for the most part, had been shielded from the fierce rivalries, petty jealousies and colossal egos in the research community that can disrupt scientific progress.

Dr. Montagnier sued Dr. Gallo for using his discovery for a U.S. patent. The suit was settled out of court, mediated by Jonas Salk, who had years earlier been involved in a similar battle with Albert Sabin over the polio vaccine. Both Dr. Montagnier and Dr. Gallo shared many prestigious awards, among them the 1986 Albert Lasker Medical Research Award, which honored Dr. Montagnier for discovering the virus and Dr. Gallo for linking it to AIDS. That same year, the AIDS virus, known by Americans as H.T.L.V.-III and the French as L.A.V., was officially given one name, H.I.V., for human immunodeficiency virus. The following year, with the dispute between the doctors still raging, President Ronald Reagan and Prime Minister Jacques Chirac of France stepped into the fray and signed an agreement to share patent royalties, proclaiming both scientists co-discoverers of the virus. In 2002, the two scientists appeared to have resolved their rivalry, at least temporarily, when they announced that they would work together to develop an AIDS vaccine. Then came the announcement of the 2008 Nobel Prize for Medicine or Physiology. Dr. Gallo had long been credited with linking H.I.V. to AIDS, but the Nobel Committee for Physiology or Medicine singled out its discoverers, awarding half the prize jointly to Dr. Montagnier and Dr. Barre-Sinoussi. (The other half was awarded to Dr. Harald zur Hausen of Germany "for his discovery of human papilloma viruses causing cervical cancer.")

An anonymous reader shares a report: As natural resources diminish and the climate crisis grows more acute, the notion of a circular economy has been gaining traction around the globe. Most modern economies are linear -- they rest on a "take, make, waste" model in which natural resources are extracted, their valuable elements are transformed into products, and anything left over (along with the products themselves when they are no longer useful) is discarded as waste. In contrast, a circular economy replaces the extraction of resources with the transformation of existing products and essentially does away with the notion of waste altogether. A growing number of governments, from the municipal to the international, have thrown their weight behind the idea. The E.U. launched its action plan for the transition to a circular economy in 2015, then updated it in 2020 as part of the Green Deal to include initiatives that encourage companies to design products -- from laptops to jeans -- so that they last longer and can be more easily repaired. In February, the European Parliament passed a resolution demanding additional measures that would allow it to adopt a fully circular carbon-neutral economy by 2050. Some member states, including the Netherlands, have also drafted similar plans at the national level.

Among them, Finland stands out for the comprehensiveness of its approach. Back in 2016, it became the first to adopt a national "road map" to a circular economy -- a commitment it reaffirmed last year by setting targeted caps on natural-resource extraction. Like other nations, Finland supports entrepreneurship in creative reuse, or upcycling (especially in its important forestry industry), urges public procurements that rely on recycled and repurposed materials, and seeks to curb dramatically the amount of waste going to landfill. But from the beginning, the country of 5.5 million has also focused closely on education, training its younger generations to think of the economy differently than their parents and grandparents do. "People think it's just about recycling," says Nani Pajunen, a sustainability expert at Sitra, the public innovation fund that has spearheaded Finland's circular conversion. "But really, it's about rethinking everything -- products, material development, how we consume." To make changes at every level of society, Pajunen argues, education is key -- getting every Finn to understand the need for a circular economy, and how they can be part of it. A pilot program to help teachers incorporate the notion into curriculums in 2017 "just snowballed," says Pajunen. "By the end of the two years, 2,500 teachers around the country had joined the network -- far more than we had directly funded." Since then, studying the circular economy has taken on a life of its own, starting with the youngest.

Having devoted his life to the conundrums of the cosmos, Prof Stephen Hawking has left behind a mystery of his own amid the eclectic contents of his former office. From a report: The Cambridge cosmologist, who died in 2018 at the age of 76, treasured a blackboard that became smothered with cartoons, doodles and equations at a conference he arranged in 1980. But what all the graffiti and in-jokes mean is taking some time to unravel. The blackboard -- as much a perplexing work of art as a memento from the history of physics -- goes on display for the first time on Thursday as part of a collection of office items acquired by the Science Museum in London.

The hope for Juan-Andres Leon, the curator of Stephen Hawking's office, is that surviving attenders of the conference on superspace and supergravity held in Cambridge more than 40 years ago swing by and explain what some of the sketches and comments mean. "We'll certainly try and extract their interpretations," Leon said. Joining the blackboard in a temporary display called Stephen Hawking at Work is a rare copy of the physicist's 1966 PhD thesis, his wheelchair, a formal bet that information swallowed by a black hole is lost for ever, and a host of celebrity memorabilia, including a personalised jacket given to him by the creators of the Simpsons for his many appearances on the show.

Our nearest neighboring star, Proxima Centauri, may be harboring an extensive solar system, as scientists believe they've found a third planet orbiting it. From a report: It's a find that re-emphasizes just how commonplace planets outside our Solar System may be -- and it provides us with a third possible world nearby to study and potentially explore. Located a little more than 4 light-years from Earth, Proxima Centauri has long captured the imagination of scientists and sci-fi enthusiasts as a prime place to visit if we ever venture far outside our Solar System. The celestial object became even more intriguing in 2016 when astronomers found a planet orbiting around it. Called Proxima b, the planet is located in the star's habitable zone, where temperatures may be just right for water to pool on the surface. Just a few years later, a second planet, called Proxima c, was discovered around the star, too. With the discovery of this third likely exoplanet, called Proxima d, Proxima Centauri is possibly home to a wide array of worlds. While we do not have the means to travel to Proxima Centauri yet in any kind of reasonable time frame, these planets might be the first places we'd visit if we ever do develop such a capability. For now, their close proximity to Earth makes them prime candidates for follow-up study and observations. Astronomers say they could help us in our ever-evolving quest to understand how planets form around distant stars.