"SpaceX may be best known for revolutionizing rocket launches with its reusable rockets..." writes Digital Trends, but now, "Europe wants to get in on the action." The European Space Agency (ESA) has announced it is developing its own reusable rocket engine...with the aim of making rocket launches considerably cheaper. The ESA described its planned engine as "the precursor of ultra-low-cost rocket propulsion that is flexible enough to fit a fleet of new launch vehicles for any mission and will be potentially reusable."

The French space agency CNES, along with the aerospace company Ariane Group, unveiled its plans for a reusable rocket last year. The ESA has now chosen to fully fund the Prometheus engine design to create a usable version that it hopes can be produced considerably cheaper — down to a tenth of the cost — than current options... The ESA will soon begin testing the hardware components of the Prometheus engine at the German Space Agency facilities in Lampoldshausen, Germany. It says it already has manufactured components including the turbo pump's turbine, pump inlet, and gas generator valves, and it is currently manufacturing main subsystems.

The aim is to finish the first combustion chamber model this month, then deliver the real version of this combustion chamber by the end of the year, before assembling a full demonstration version of the engine for testing by 2021.

Iceland is the most sparsely-populated country in Europe, with a population of 364,134 spread across 40,000 square miles (103,000 square kilometers). But the New Yorker notes Iceland has "virtually eliminated" Covid-19 cases -- and tries to explore how they did it.

By February 28th, Iceland had already implemented a contact-tracing team. "And then, two hours later, we got the call," remembers a detective with the Reykjavík police department. A man who'd recently been skiing in the Dolomites had become the country's first known coronavirus patient... Anyone who'd spent more than fifteen minutes near the man in the days before he'd experienced his first symptoms was considered potentially infected. ("Near" was defined as within a radius of two metres, or just over six feet.) The team came up with a list of fifty-six names. By midnight, all fifty-six contacts had been located and ordered to quarantine themselves for fourteen days.

The first case was followed by three more cases, then by six, and then by an onslaught. By mid-March, confirmed COVID cases in Iceland were increasing at a rate of sixty, seventy, even a hundred a day. As a proportion of the country's population, this was far faster than the rate at which cases in the United States were growing. The number of people the tracing team was tracking down, meanwhile, was rising even more quickly. An infected person might have been near five other people, or fifty-six, or more. One young woman was so active before she tested positive — going to classes, rehearsing a play, attending choir practice — that her contacts numbered close to two hundred. All were sent into quarantine.

The tracing team, too, kept growing, until it had fifty-two members. They worked in shifts out of conference rooms in a Reykjavík hotel that had closed for lack of tourists. To find people who had been exposed, team members scanned airplane manifests and security-camera footage. They tried to pinpoint who was sitting next to whom on buses and in lecture halls. One man who fell ill had recently attended a concert. The only person he remembered having had contact with while there was his wife. But the tracing team did some sleuthing and found that after the concert there had been a reception. "In this gathering, people were hugging, and eating from the same trays," Pálmason told me. "So the decision was made — all of them go into quarantine." If you were returning to Iceland from overseas, you also got a call: put yourself in quarantine. At the same time, the country was aggressively testing for the virus — on a per-capita basis, at the highest rate in the world...

[B]y mid-May, when I went to talk to Pálmason, the tracing team had almost no one left to track. During the previous week, in all of Iceland, only two new coronavirus cases had been confirmed. The country hadn't just managed to flatten the curve; it had, it seemed, virtually eliminated it.
A biotech firm called deCODE Genetics (owned by the American multinational biopharmaceutical company Amgen) also offered its own facilities for screening tests, which "picked up many cases that otherwise would have been missed," according to the article. "These cases, too, were referred to the tracing team. By May 17th, Iceland had tested 15.5 per cent of its population for the virus." Meanwhile, deCODE was also sequencing the virus from every Icelander whose test had come back positive. As the virus is passed from person to person, it picks up random mutations. By analyzing these, geneticists can map the disease's spread...

[R]esearchers at deCODE found that, while attention had been focussed on Italy, the virus had been quietly slipping into the country from several other nations, including Britain. Travellers from the West Coast of the U.S. had brought in one strain, and travellers from the East Coast another. The East Coast strain had been imported to America from Italy or Austria, then exported back to Europe.

Long-time Slashdot reader mrflash818 ("Linux geek since 1999") shared a ZDNet article pointing out that SpaceX's Falcon 9 rocket has an onboard operating system that's "a stripped-down Linux running on three ordinary dual-core x86 processors. The flight software itself runs separately on each processor and is written in C/C++."

Interestingly, back in 2018 a Slashdot headline asked whether C++ was "a really terrible language," and Elon Musk replied on Twitter with his single-word answer. "Yes."

ZDNet points out that "ordinary" processors are often needed because of the multi-year development time for the spacecraft they power. Their article notes that the International Space Station actually runs on 1988-vintage 20 MHz Intel 80386SX CPUs: Of course, while those ancient chips work for the station's command and control multiplexer/demultiplexer, they're not much good for anything else. For ordinary day-in and day-out work, astronauts use HP ZBook 15s running Debian Linux, Scientific Linux, and Windows 10. The Linux systems act as remote terminals to the control multiplexer/demultiplexer, while the Windows systems are used for email, the web, and fun.

Usually, though, chips that go into space aren't ordinary chips. CPUs that stay in space must be radiation-hardened. Otherwise, they tend to fail due to the effects of ionizing radiation and cosmic rays. These customized processors undergo years of design work and then more years of testing before they are certified for spaceflight. For instance, NASA expects its next-generation, general-purpose processor, an ARM A53 variant you may know from the Raspberry Pi 3, to be ready to run in 2021...

The Dragon spacecraft's touchscreen interface is rendered using Chromium and JavaScript. If something were to go wrong with the interface, the astronauts have physical buttons to control the spacecraft.
Today the SpaceX software team answered questions on Reddit, revealing they use Chromium with a reactive library developed in-house, and that "All of our on-board computers either run Linux (with the PREEMPT_RT patch) or are microcontrollers that run bare-metal code...." Later they emphasized that for the Falcon 9 and Dragon software, "All of the application-level autonomous software is written in C++. We generally use object oriented programming techniques from C++, although we like to keep things as simple as possible.

"We do use open source libraries, primarily the standard C++ library, plus some others. However, we limit our use of open source libraries to only extremely high quality ones, and often will opt to develop our own libraries when it is feasible so that we can control the code quality ourselves."

An anonymous reader writes: When talking about the nine year gap since America last flew astronauts with their own spacecraft, it's often said that NASA didn't have a plan in place when they retired the Space Shuttle. But the reality is a lot more complicated than that. NASA was working on a new spacecraft and rocket, and even made a successful test flight two years before the last Shuttle flight, but the program ended up getting canceled when the White House Administration changed. A review concluded that completing the program "would cost at least $150 billion dollars, and even then, a return to the Moon or a mission to Mars in the foreseeable future was unlikely," according to the article. Money was instead allocated to private alternatives like Sierra Nevada's Dream Chaser spaceplane as well as Boeing's CST-100 Starliner -- though in the end it was SpaceX's Crew Dragon which would launch the next American rocket carrying American astronauts into space. "The dark horse soundly beat the entrenched giants," the article concludes, "and the democratization of space has never been closer.

"It's hard to predict what the next decade of human spaceflight will look like, but there's no question it's going to be a lot more exciting than the previous one."

sciencehabit quotes Science magazine: The classic eye exam may be about to get an upgrade. Researchers have developed an online vision test — fueled by artificial intelligence (AI) — that produces much more accurate diagnoses than the sheet of capital letters we've been staring at since the 19th century. If perfected, the test could also help patients with eye diseases track their vision at home...

[W]hen the researchers ran their "Stanford acuity test" (StAT) through 1000 computer simulations mimicking real patients, the diagnostic reduced error by 74% compared with the classic eye test, the team reports this month in the Proceedings of the AAAI Conference on Artificial Intelligence. The simulations work by starting with a known acuity score and factors in the types of mistakes a human might make. It then virtually "takes" the different eye tests in order to compare how accurate they are. The team used this instead of actual patients because it starts with the "true" acuity — something unknown in a human.

You can take StAT yourself at myeyes.ai, although the team cautions that the test isn't meant to replace doctor visits just yet.

An anonymous reader quotes Reuters: British scientists halted a major drug trial on Friday after it found that the anti-malarial hydroxychloroquine, touted by U.S. President Donald Trump as a potential "game changer" in the pandemic, was "useless" at treating COVID-19 patients. "This is not a treatment for COVID-19. It doesn't work," Martin Landray, an Oxford University professor who is co-leading the RECOVERY trial, told reporters.

"This result should change medical practice worldwide. We can now stop using a drug that is useless..."

Landray, a professor of medicine and epidemiology at Oxford University, noted the "huge speculation" about the drug as a treatment for COVID-19 but said there had been until now "an absence of reliable information from large randomised trials". He said the preliminary results from RECOVERY, which was a randomised trial, were now quite clear: hydroxychloroquine does not reduce the risk of death among hospitalised patients with COVID-19.

"If you're admitted to hospital, don't take hydroxychloroquine," he said.
The trial involved over 11,000 patients in a randomized trial begun in March.

The article ends by quoting Parastou Donyai, director of Pharmacy Practice at the University of Reading in England, who describes the announcement as "welcome relief to thousands of scientists, doctors and academics who have been crying out for proper proof of whether hydroxychloroquine works in COVID-19 or not" -- and calling the conclusion that it does not work "definitive."

Carbon dioxide levels in the atmosphere have risen strongly to a new peak this year, despite the impact of the global effects of the coronavirus crisis. The Guardian reports: The concentration of CO2 in the atmosphere reached 417.2 parts per million in May, 2.4ppm higher than the peak of 414.8ppm in 2019, according to readings from the Mauna Loa observatory in the US. Without worldwide lockdowns intended to slow the spread of Covid-19, the rise might have reached 2.8ppm, according to Ralph Keeling, a professor at the Scripps Institution of Oceanography. He said it was likely they had played a small role, but that the difference was too small to show up against other factors causing year-to-year fluctuations.

Daily emissions of carbon dioxide fell by an average of about 17% around the world in early April, according to the a comprehensive study last month. As lockdowns are eased, however, the fall in emissions for the year as a whole is only likely to be only between 4% and 7% compared with 2019. That will make no appreciable difference to the world's ability to meet the goals of the Paris agreement, and keep global heating below the threshold of 2C that scientists say is necessary to stave off catastrophic effects. If emissions reductions of 20% to 30% were sustained for six to 12 months, then the rate of increase of CO2 measured at Mauna Loa would slow, according to the Scripps scientists.

People want to help each other, even when it costs them something, and even when the motivations to help don't always align, a new study suggests. Phys.Org reports: In research published today in the journal Science Advances, sociologists found that people overwhelmingly chose to be generous to others -- even to strangers, and even when it seems one motivation to help might crowd out another. It is the first study to examine how all the established motivations to be generous interact with one another.

The study involved more than 700 people, and was designed to help researchers understand prosocial behavior. For this study, which was done online, participants had to decide how much of a 10-point endowment to give to other people. The points had monetary value to the participants; giving cost them something. Then the researchers created different scenarios that combined one or all four of the potential motivators for giving. One: The recipient of a kindness is inclined to do something nice for the giver in return. Two: A person is motivated to do something nice to someone that she saw be generous to a third person. Three: A person is likely to do good in the presence of people in their network who might reward their generosity. And four: A person is likely to "pay it forward" to someone else if someone has done something nice for her.

[David Melamed, lead author of the study and an associate professor of sociology at The Ohio State University] said that prior to the experiment, he thought the motivations for kindness might crowd one another out. "People have a self-bias," he said. "If you do something nice for me, I may weigh that more than if I see you do something nice for someone else. But we found that all the motivators still show up as predictors of how much a person is willing to give to someone else, regardless of how the differing motivators are combined." This research helps us understand the remarkable quantity and diversity of prosocial behavior we see in humans, Melamed said. "From an evolutionary perspective, it's kind of perplexing that it even exists, because you're decreasing your own fitness on behalf of others," Melamed said. "And yet, we see it in bees and ants, and humans and throughout all of nature."

Researchers at the University of Bayreuth have created a form of nitrogen that's never been seen before. Nicknamed "black nitrogen," the new substance is crystalline, occurs in two-dimensional sheets, and could one day be useful in advanced electronics. From a report: Strangely enough, the idea that black nitrogen didn't exist has long been considered a mystery. The periodic table is arranged in recurring "periods" where each column is made up of elements with similar properties. Those at the top have the fewest protons and the lowest weight, and each successive element in the group gains protons and weight. Under high pressure, elements on the top of a column usually take on structures similar to elements further down the group. These different forms are known as allotropes. Ozone is an allotrope of oxygen, for example, while graphite and diamond are both allotropes of carbon. But nitrogen only has one allotrope -- dinitrogen -- and doesn't have any that resemble heavier elements in its group. This was always considered a bit weird, but now a new study has found a previously-unknown allotrope that shows that nitrogen isn't an exception to the rule, as has long been believed.

The Apple Watch's Fall Detection feature is being credited as helping save an unresponsive man in Chandler, Arizona. AppleInsider reports: Fall Detection, introduced on the Apple Watch Series 4, can detect if a user takes a hard fall and will alert local emergency services if they don't respond within 60 seconds. The potentially life-saving capabilities of that feature were on display on April 23, when police dispatchers in Chandler received a 911 call from an automated voice, according to local media outlet KTAR. The auto-generated message indicated that an Apple Watch wearer had fallen and was not responding, and also provided authorities with the exact latitude and longitude of the man's location. When officers and the Chandler Fire Department showed up, they found that the man had fainted and collapsed.

schwit1 shares a report from UPI: Visits to hospital U.S. emergency rooms have dropped by more than 40 percent so far in 2020, compared to the same period last year, according to figures released Wednesday by the U.S. Centers for Disease Control and Prevention. The CDC researchers compared total visits so far this year to the same five-month period in 2019. The number of ER visits declined from a mean of roughly 2.1 million per week between March 31, 2019, and April 27, 2019, to a mean of 1.22 million per week during the "early pandemic" period of March 29 to April 25 of this year, according to the CDC. ER visits declined for every age group, with the largest proportional declines in children 10 years old and younger at 72 percent and children 11 to 14 years old at 71 percent, the agency said. Researchers found the largest declines in ER visits occurred in the New England states at 49 percent, as well as in the mid-Atlantic region at 48 percent. That region includes New York and New Jersey, which has been the epicenter of the U.S. COVID-19 outbreak.

ER visits related to abdominal pain and other digestive problems fell by more than 66,000 per week from year to year, while those among patients reporting musculoskeletal pain -- excluding low-back pain -- dropped by more than 52,000 per week, according to the CDC report. Visits for "sprains and strains" declined by nearly 34,000 per week, and those related to "superficial injuries" fell by nearly 31,000 per week, the researchers said. Conversely, ER visits for "exposure, encounters, screening or contact with infectious disease" increased by nearly 19,000 per week from 2019 to 2020, the analysis found. Specifically, some 18,000 ER visits occurred per week across the country for COVID-19 symptoms through the end of May, the researchers said. The researchers say more research is needed to determine whether the decline in ER visits could be attributed to "actual reductions in injuries or illness [due] to changing activity patterns during the pandemic" lockdown, or if Americans simply delayed or declined emergency care.

sciencehabit writes: Type Ia supernovae, a bright and long-lasting brand of stellar explosion, play a vital role in cosmic chemical manufacturing, forging in their fireballs most of the iron and other metals that pervade the universe. The explosions also serve as "standard candles," assumed to shine with a predictable brightness. Their brightness as seen from Earth provides a cosmic yardstick, used among other things to discover "dark energy," the unknown force that is accelerating the expansion of the universe. Astronomers have long thought that the blasts come from white dwarfs, burnt out stars once like our Sun, reignited after stealing material from a companion red giant. But evidence is mounting that other mechanisms may be causing white dwarfs to explode, making their standard candle status a puzzle.

The malaria drug hydroxychloroquine did not help prevent people who had been exposed to others with Covid-19 from developing the disease, according to the results of an eagerly awaited study that was published Wednesday in the New England Journal of Medicine. From a report: Despite a lack of evidence, many people began taking the medicine to try to prevent infection early in the Covid-19 pandemic, following anecdotal reports it could be effective and claims by President Trump and conservative commentators. Trump, too, said he took hydroxychloroquine to prevent infection. But the new study, the first double-blind randomized, placebo-controlled trial of hydroxychloroquine, found otherwise. "I think in the setting of post-exposure prophylaxis, it doesn't seem to work," said Sarah Lofgren, an assistant professor at the University of Minnesota who is a co-author of the study. Other studies of hydroxychloroquine are ongoing. Also Wednesday, the World Health Organization said it is resuming a clinical trial testing hydroxychloroquine as a treatment after pausing it over safety concerns.

SpaceX launched its second Falcon 9 rocket in the span of just four days on Wednesday at 9:25 PM EDT (6:25 PM PDT). This one was carrying 60 more satellites for its Starlink constellation, which will bring the total currently in operation on orbit to 480. From a report: The launch took off from Florida, where SpaceX's first astronaut launch took place on Saturday for the final demonstration mission of its Crew Dragon to fulfill the requirements of NASA's Commercial Crew human-rating process. Today's launch didn't include any human passengers, but it did fly that next big batch of Starlink broadband internet satellites, as mentioned. Those will join the other Starlink satellites in low Earth orbit, forming part of a network that will eventually serve to provide high-bandwidth, reliable internet connectivity, particularly in underserved areas where terrestrial networks either aren't present or don't offer high-speed connections. This launch included a test of a new system that SpaceX designed in order to hopefully improve an issue its satellites have had with nighttime visibility from Earth. The test Starlink satellite, one of the 60, has a visor system installed that it can deploy post-launch in order to block the sun from reflecting off its communication antenna surfaces. If it works as designed, it should greatly reduce sunlight reflected off the satellite back to Earth, and SpaceX will then look to make it a standard part of its Starlink satellite design going forward.

The group behind CES plans to hold the enormous tech convention in person in Las Vegas next January, despite concerns that the coronavirus pandemic may still be a threat. The Consumer Technology Association has announced that it intends to give exhibitors a way to showcase their products "both physically in Las Vegas and digitally." From a report: The stakes are high for CES. It's one of the largest conventions held each year in Las Vegas, responsible for bringing a huge number of visitors to the city, with around 175,000 attendees last year. The Las Vegas Convention Center, the primary venue where the event is held, is scheduled to complete a $980 million expansion just in time for next year's show. And while consumers may know CES as the event where new TVs, cars, and other gadgets are announced, it also remains an important venue for meetings between retailers, manufacturers, and all the companies in between.

Researchers from Monash University and the CSIRO have set a record for carbon dioxide capture and storage (CCS) using technology that resembles a sponge filled with tiny magnets. Phys.Org reports: Using a Metal Organic Frameworks (MOFs) nanocomposite that can be regenerated with remarkable speed and low energy cost, researchers have developed sponge-like technology that can capture carbon dioxide from a number of sources, even directly from air. The magnetic sponge is used to remove carbon dioxide using the same techniques as induction cooktops using one-third of the energy than any other reported method.

In the study, published in Cell Reports Physical Science, researchers designed a unique adsorbent material called M-74 CPT@PTMSP that delivered a record low energy cost of just 1.29 MJ kg-1CO2 , 45 per cent below commercially deployed materials, and the best CCS efficiency recorded. MOFs are a class of compounds consisting of metal ions that form a crystalline material with the largest surface area of any material known. In fact, MOFs are so porous that they can fit the entire surface of a football field in a teaspoon. This technology makes it possible to store, separate, release or protect valuable commodities, enabling companies to develop high value products.

The stability of M-74 CPT@PTMSP was evaluated by estimating the amount of CO2 and H2O captured and released via the researchers' magnetic induction swing adsorption (MISA) process over 20 consecutive cycles. The regeneration energy calculated for M-74 CPT@PTMSP is the lowest reported for any solid porous adsorbent. At magnetic fields of 14 and 15 mT, the regeneration energy calculated for M-74 CPT was 1.29 and 1.44 MJ kg CO2-1.

An anonymous reader quotes a report from The Guardian: A new study published in Scientific Reports reveals that crystalline rocks, such as granite, have a natural self-sealing mechanism, capable of keeping fluids locked away for millions of years. Careful analysis of the chemistry and structure of granites from Japan and the UK revealed that when fluid did enter the rock (via fractures), it travelled a few centimeters at most. The scientists believe that calcium in the rock reacted with carbonate in the fluid to create tiny crystals of calcite that plugged all the gaps and prevented further flow. "This amount of calcite would never be expected in a granite, and the distribution of it indicates it almost certainly formed from small quantities of fluid trying to move through the rock," says Roy Wogelius from the University of Manchester. Greater understanding is needed before we finalize our radioactive waste disposal strategies, but this is a promising step forward.

AmiMoJo shares a report from The Guardian The World Health Organization and a number of national governments have changed their Covid-19 policies and treatments on the basis of flawed data from a little-known U.S. healthcare analytics company, also calling into question the integrity of key studies published in some of the world's most prestigious medical journals. Surgisphere, whose employees appear to include a sci-fi writer and adult content model, provided the database behind Lancet and New England Journal of Medicine hydroxychloroquine studies. Data it claims to have legitimately obtained from more than a thousand hospitals worldwide formed the basis of scientific articles that have led to changes in Covid-19 treatment policies in Latin American counties. It was also behind a decision by the WHO and research institutes around the world to halt trials of the controversial drug hydroxychloroquine. Late on Tuesday, the Lancet released an "expression of concern" about its published study. The New England Journal of Medicine has also issued a similar notice. According to an independent audit by authors not affiliated with Surgisphere, the article includes a list of "concerns that have been raised about the reliability of the database." Some of the main points include: Surgisphere's employees have little or no data or scientific background; While Surgisphere claims to run one of the largest and fastest growing hospital databases in the world, it has almost no online presence; and The firm's chief executive, Sapan Desai, has been named in three medical malpractice suits.

schwit1 shares a report: Throughout January, the World Health Organization publicly praised China for what it called a speedy response to the new coronavirus. It repeatedly thanked the Chinese government for sharing the genetic map of the virus "immediately," and said its work and commitment to transparency were "very impressive, and beyond words." But behind the scenes, it was a much different story, one of significant delays by China and considerable frustration among WHO officials over not getting the information they needed to fight the spread of the deadly virus, The Associated Press has found. Despite the plaudits, China in fact sat on releasing the genetic map, or genome, of the virus for more than a week after three different government labs had fully decoded the information. Tight controls on information and competition within the Chinese public health system were to blame, according to dozens of interviews and internal documents. Chinese government labs only released the genome after another lab published it ahead of authorities on a virologist website on Jan. 11. Even then, China stalled for at least two weeks more on providing WHO with detailed data on patients and cases, according to recordings of internal meetings held by the U.N. health agency through January -- all at a time when the outbreak arguably might have been dramatically slowed.

An anonymous reader quotes a report from The Wall Street Journal: Clinicians racing to understand the novel disease are starting to discern an unusual trend: one common symptom -- the loss of smell and taste -- can linger months after recovery. Doctors say it is possible some survivors may never taste or smell again. Out of 417 patients who suffered mild to moderate forms of Covid-19 in Europe, 88% and 86% reported taste and smell dysfunctions, respectively, according to a study published in April in the European Archives of Oto-Rhino-Laryngology. Most patients said they couldn't taste or smell even after other symptoms were gone. Preliminary data showed at least a quarter of people regained their ability to taste and smell within two weeks of other symptoms dissipating. The study said long-term data are needed to assess how long this can last in people who didn't report an improvement.

Anyone who has had the sniffles knows a stuffy nose impedes smell and taste; the novel coronavirus's ability to break down smell receptors is puzzling because it occurs without nasal congestion. One theory is that the "olfactory receptors that go to the brain -- that are essentially like a highway to the brain -- commit suicide so they can't carry the virus to the brain," said Danielle Reed, associate director of the Monell Chemical Senses Center. "It could be a healthy reaction to the virus. If that doesn't work, maybe people do get sicker," she said. "It might be a positive takeaway from what is obviously a devastating loss to people."