sciencehabit summarizes a new article from Science magazine: Attention racehorse jockeys: Start fast, but save enough energy for a final kick. That's the ideal strategy to win short-distance horse races, according to the first mathematical model to calculate how horses use up energy in races. The researchers say the approach could be used to identify customized pacing plans that, in theory, would optimize individual horses' chances of winning.

The team took advantage of a new GPS tracking tool embedded in French racing saddles. The trackers let fans watch digital images of the horses move across a screen, and they gave the researchers real-time speed and position data. The scientists studied patterns in dozens of races at the Chantilly racetracks north of Paris and developed a model that accounted for winning strategies for three different races: a short one (1300 meters), a medium one (1900 meters), and a slightly longer one (2100 meters), all with different starting points on the same curved track. The model takes into account not just different race distances, but also the size and bend of track curves, and any slopes or friction from the track surface.

The results might surprise jockeys who hold horses back early for bursts of energy in the last furlough. Instead, a strong start leads to a better finish, the team found. That doesn't mean those jockeys are wrong, though. Too strong of a start can be devastating as well, leaving the horse 'exhausted by the end,' one of the researchers says.
Even so, "We can't truly model performance," argues a veterinarian at the University of Sydney with over 30 years of experience working at horse racetracks. But he also asks Science, "Do we really want to?

"For people who love horse racing, the uncertainty provides the excitement, and the actual running of the horses provides the spectacle and the beauty."

Friday on Instagram Jeff Bezos shared footage from NASA's test of Blue Origin's BE-7 engine, which he described approvingly as "a high-performance, additively manufactured liquid hydrogen/liquid oxygen lunar landing engine with 10,000 lbf [pound-force] of thrust — deep throttling down to 2,000 lbf for a precise landing on the Moon."

The test brings the program's cumulative test time up to 1,245 seconds, reports Reuters: Blue Origin leads a "national team" as the prime contractor that it assembled in 2019 to help build its Blue Moon lander. That team includes Lockheed Martin Corp, Northrop Grumman Corp and Draper. Blue Origin has vied for lucrative government contracts in recent years and is competing with rival billionaire Elon Musk's SpaceX and Dynetics, owned by Leidos Holdings Inc, to win a contract to build NASA's next human lunar landing system to ferry humans to the moon in the next decade.

In April, NASA awarded a lunar lander development contract to Blue Origin's team worth $579 million, as well as two other companies: SpaceX which received $135 million to help develop its Starship system and Leidos-owned Dynetics which won $253 million. NASA is poised to pick two of the three companies "in early March" 2021 to continue building their lander prototypes for crewed missions to the moon beginning in 2024, an agency spokeswoman has said.

Long-time Slashdot reader reminds us that in 1999 scientists discovered the asteroid Ryugu flying 300 million kilometres (or 186,411,357 miles) from earth. In 2014, Japan launched a probe to collect samples from it.

Today those samples returned to earth.

The International Business Times shares pictures and report: In a streak of light across the night sky, samples collected from a distant asteroid arrived on Earth after being dropped off by Japanese space probe Hayabusa-2. Scientists hope the precious samples, which are expected to amount to no more than 1 gram of material, could help shed light on the origin of life and the formation of the universe. [That's 0.00220462262185 pounds.]

The capsule carrying samples entered the atmosphere just before 2:30 am Japan time (1730 GMT Saturday), creating a shooting-star-like fireball as it entered Earth's atmosphere. "Six years and it has finally come back to Earth," an official narrating a live broadcast of the arrival said, as images showed officials from Japan's space agency JAXA cheering and pumping their fists in excitement... The capsule was recovered in the southern Australian desert, and will now be processed before being sent to Japan...

The probe collected both surface dust and pristine material from below the surface that was stirred up by firing an "impactor" into the asteroid. The material collected from the asteroid is believed to be unchanged since the time the universe was formed...

Scientists are especially keen to discover whether the samples contain organic matter, which could have helped seed life on Earth.

"A Mysterious Object Is Hurtling Towards Earth, and Scientists Don't Know What It Is," read Newsweek's headline on Monday, describing an object projected to pass 31,605 miles from earth. (One astronomer told them that was roughly 13% of the average distance between the earth and the moon).

But then a computer model calculated its past trajectories through space, according to the director for NASA's Center for Near Earth Object Studies (CNEOS). "One of the possible paths for 2020 SO brought the object very close to Earth and the Moon in late September 1966," he said in a statement. "It was like a eureka moment when a quick check of launch dates for lunar missions showed a match with the Surveyor 2 mission."

On Wednesday NASA described how a team led by Vishnu Reddy, an associate professor/planetary scientist at the Lunar and Planetary Laboratory at the University of Arizona, tried to prove what they'd seen was a 54-year-old booster rocket: Through a series of follow up observations, Reddy and his team analyzed 2020 SO's composition using NASA's IRTF and compared the spectrum data from 2020 SO with that of 301 stainless steel, the material Centaur rocket boosters were made of in the 1960's. While not immediately a perfect match, Reddy and his team persisted, realizing the discrepancy in spectrum data could be a result of analyzing fresh steel in a lab against steel that would have been exposed to the harsh conditions of space weather for 54 years. This led Reddy and his team to do some additional investigation.

"We knew that if we wanted to compare apples to apples, we'd need to try to get spectral data from another Centaur rocket booster that had been in Earth orbit for many years to then see if it better matched 2020 SO's spectrum," said Reddy. "Because of the extreme speed at which Earth-orbiting Centaur boosters travel across the sky, we knew it would be extremely difficult to lock on with the IRTF long enough to get a solid and reliable data set."

However, on the morning of Dec. 1, Reddy and his team pulled off what they thought would be impossible. They observed another Centaur D rocket booster from 1971 launch of a communication satellite that was in Geostationary Transfer Orbit, long enough to get a good spectrum. With this new data, Reddy and his team were able to compare it against 2020 SO and found the spectra to be consistent with each another, thus definitively concluding 2020 SO to also be a Centaur rocket booster...
So what happens next? 2020 SO made its closest approach to Earth on Dec. 1, 2020 and will remain within Earth's sphere of gravitational dominance — a region in space called the "Hill Sphere" that extends roughly 930,000 miles (1.5 million kilometers) from our planet — until it escapes back into a new orbit around the Sun in March 2021.

As NASA-funded telescopes survey the skies for asteroids that could pose an impact threat to Earth, the ability to distinguish between natural and artificial objects is valuable as nations continue to explore and more artificial objects find themselves in orbit about the Sun.

Astronomers will continue to observe this particular relic from the early Space Age until it's gone.

NBC News reports: The mysterious neurological symptoms experienced by American diplomats in China and Cuba are consistent with the effects of directed microwave energy, according to a long-awaited report by the National Academies of Sciences that cites medical evidence to support the long-held conviction of American intelligence officials.

The report, obtained Friday by NBC News, does not conclude that the directed energy was delivered intentionally, by a weapon, as some U.S. officials have long believed. But it raises that disturbing possibility...

A team of medical and scientific experts who studied the symptoms of as many as 40 State Department and other government employees concluded that nothing like them had previously been documented in medical literature, according to the National Academies of Sciences report... "The committee felt that many of the distinctive and acute signs, symptoms and observations reported by (government) employees are consistent with the effects of directed, pulsed radio frequency (RF) energy," the report says. "Studies published in the open literature more than a half-century ago and over the subsequent decades by Western and Soviet sources provide circumstantial support for this possible mechanism...."

In the last year, as first reported by GQ Magazine and The New York Times, a number of new incidents have been reported by CIA officers in Europe and Asia, including one involving Marc Polymeropoulos, who retired last year after a long and decorated career as a case officer. He told NBC News he is still suffering the effects of what he believes was a brain injury he sustained on a trip to Moscow. A source directly familiar with the matter told NBC News the CIA, using mobile phone location data, had determined that some Russian intelligence agents who had worked on microwave weapons programs were present in the same cities at the same time that CIA officers suffered mysterious symptoms. CIA officials consider that a promising lead but not conclusive evidence.

The State Department, responding to the report, said that "each possible cause remains speculative" and added that the investigation, now three years old, is still "ongoing." Although it praised the National Academies of Sciences for undertaking the effort, the State Department offered a long list of "challenges of their study" and limitations in the data the academies were given access to, suggesting that the report should not be viewed as conclusive...

The report says more investigation is required [and] recommends that the State Department establish a response mechanism for similar incidents that allows new cases to be studied more quickly and effectively [as well as neurological assessments for all State Department employees on foreign assignments].
NBC notes that the study examined four possible causes: Infection, chemicals, psychological factors and microwave energy. The report concludes that "Among the plausible mechanisms that the committee considered, directed radio frequency (RF) energy, especially in those with the distinct early manifestations, appears most germane, along with persistent postural perceptual dizziness (PPPD) as a secondary reinforcing mechanism, as well as the additive effects of psychological conditions.

"The committee cannot rule out other possible mechanisms, and again, considers it likely that a multiplicity of factors explains some cases and the differences between others."

New Mexico's governor announced plans to allow hospitals "to ration care depending on a patient's likelihood of surviving," according to the Washington Post.

But in fact, many of America's hospitals are now "overwhelmed," reports CBS News, adding "A record-breaking 227,00 new cases were reported in the U.S. on Friday alone — the first time the daily case count has topped 220,000, according to a tally from Johns Hopkins University."

Two co-founders of the COVID Tracking Project offer this assessment of the state of America: On Wednesday, the country tore past a nauseating virus record. For the first time since the pandemic began, more than 100,000 people were hospitalized with COVID-19 in the United States, nearly double the record highs seen during the spring and summer surges. The pandemic nightmare scenario — the buckling of hospital and health-care systems nationwide — has arrived. Several lines of evidence are now sending us the same message: Hospitals are becoming overwhelmed, causing them to restrict whom they admit and leading more Americans to die needlessly...

Many states have reported that their hospitals are running out of room and restricting which patients can be admitted. In South Dakota, a network of 37 hospitals reported sending more than 150 people home with oxygen tanks to keep beds open for even sicker patients. A hospital in Amarillo, Texas, reported that COVID-19 patients are waiting in the emergency room for beds to become available. Some patients in Laredo, Texas, were sent to hospitals in San Antonio — until that city stopped accepting transfers. Elsewhere in Texas, patients were sent to Oklahoma, but hospitals there have also tightened their admission criteria....

The bulk of evidence now suggests that one of the worst fears of the pandemic — that hospitals would become overwhelmed, leading to needless deaths — is happening now. Americans are dying of COVID-19 who, had they gotten sick a month earlier, would have lived.

China is massively expanding its weather-control project, and is aiming to be able to cover half the country in artificial rain and snow by 2025, the government said Tuesday. Business Insider reports: The practice of "cloud seeding" was discovered in the US in 1946 by a chemist working for General Electric. China launched its own similar program in the 1960s. Dozens of other countries -- including the US -- also have such programs, but Beijing has the world's largest, employing around 35,000 people, The Guardian reported.

In a statement, China's State Council said that the country's cloud seeing project will expand fivefold to cover an area of 2.1 million square miles and be completed by 2025. (China encompasses 3.7 million square miles, meaning the project could cover 56% of the country's surface area.) The project will be at a "worldwide advanced level" by 2035, the State Council said, and will help alleviate "disasters such as drought and hail" and facilitate emergency responses "to forest or grassland fires."

An anonymous reader quotes a report from The Guardian: PhD in genetics might seem like an unusual requirement for the role of head chef. It makes more sense when the man running the kitchen is not just in charge of frying your chicken burger -- he created the meat himself. "This burger takes something between two to three days to grow," says Tomer Halevy as he chops red onions, iceberg lettuce and avocado. He proceeds to batter what appears to be a strip of raw chicken before dipping it in breadcrumbs. Halevy uses the word "grow" because chickens do not need to be slaughtered en masse to produce this type of meat. Cells taken from "source" chickens are cultured in a laboratory, creating potentially endless supplies of muscle and fat tissue. Some cells were removed from eggs, meaning the meat is from birds that were never even born. The result is the signature dish of a new venture in Israel, the Chicken, the world's first cultured meat restaurant experience. Still closed to the public owing to coronavirus restrictions, the eatery near Tel Aviv opened its doors to the Guardian for the first private visit by a journalist.

At the Chicken, bottles of red wine line the walls, black stools surround circular tables, and the warm glow of hanging bulbs lights the restaurant. The entire back wall is made of glass. Behind it is the production facility where lab-coated scientists wander around between large metal vats. It is petri-dish-to-table service. "The meat was made on the other side of the glass. That's true local production of meat," jokes Ido Savir, CEO of the restaurant's parent company, SuperMeat. The breaded patty is deep-fried in oil, before being placed on a sweet brioche bun, flavored by wasabi and chilli mayonnaise, with a side of sweet potato chips. Similar to many chicken burgers, it breaks and flakes when pulled apart and is extremely tender. It tastes, at least to this reporter, like a chicken burger.

Halevy, who also holds the role of head of product at SuperMeat, explains that muscle cells naturally contract when they are grown, making the fibers that result in the flakes of the burger that you would expect. While Halevy says he could make a recreation of a chicken breast -- with longer fibers and a dryer, denser bite -- one was not offered, and others in the industry have said a fillet is much harder to create outside the bird. For now, like others in the nascent industry, the start-up is focused on minced chicken. It is aiming to sell to meat companies that often reprocess chicken anyway, for example, into patties and nuggets. The report notes that SuperMeat cannot charge customers since there is no regulation around cultured meat in Israel. Those who try the product must also sign a waiver agreeing to "voluntarily assume any and all risks."

The industry is still very much in its infancy, but it was given a significant boost this week when Singapore became the first state to approve the sale of cultured meat.

An anonymous reader quotes a report from Scientific American: For the first time, a quantum computer made from photons -- particles of light -- has outperformed even the fastest classical supercomputers. Physicists led by Chao-Yang Lu and Jian-Wei Pan of the University of Science and Technology of China (USTC) in Shanghai performed a technique called Gaussian boson sampling with their quantum computer, named Jiuzhang. The result, reported in the journal Science, was 76 detected photons -- far above and beyond the previous record of five detected photons and the capabilities of classical supercomputers.

Unlike a traditional computer built from silicon processors, Jiuzhangis an elaborate tabletop setup of lasers, mirrors, prisms and photon detectors. It is not a universal computer that could one day send e-mails or store files, but it does demonstrate the potential of quantum computing. Last year, Google captured headlines when its quantum computer Sycamore took roughly three minutes to do what would take a supercomputer three days (or 10,000 years, depending on your estimation method). In their paper, the USTC team estimates that it would take the Sunway TaihuLight, the third most powerful supercomputer in the world, a staggering 2.5 billion years to perform the same calculation as Jiuzhang. [...] This latest demonstration of quantum computing's potential from the USTC group is critical because it differs dramatically from Google's approach. Sycamore uses superconducting loops of metal to form qubits; in Jiuzhang, the photons themselves are the qubits. Independent corroboration that quantum computing principles can lead to primacy even on totally different hardware "gives us confidence that in the long term, eventually, useful quantum simulators and a fault-tolerant quantum computer will become feasible," Lu says.

... [T]he USTC setup is dauntingly complicated. Jiuzhang begins with a laser that is split so it strikes 25 crystals made of potassium titanyl phosphate. After each crystal is hit, it reliably spits out two photons in opposite directions. The photons are then sent through 100 inputs, where they race through a track made of 300 prisms and 75 mirrors. Finally, the photons land in 100 slots where they are detected. Averaging over 200 seconds of runs, the USTC group detected about 43 photons per run. But in one run, they observed 76 photons -- more than enough to justify their quantum primacy claim. It is difficult to estimate just how much time would be needed for a supercomputer to solve a distribution with 76 detected photons -- in large part because it is not exactly feasible to spend 2.5 billion years running a supercomputer to directly check it. Instead, the researchers extrapolate from the time it takes to classically calculate for smaller numbers of detected photons. At best, solving for 50 photons, the researchers claim, would take a supercomputer two days, which is far slower than the 200-second run time of Jiuzhang.

John Trumpian shares a report from SciTechDaily: Harvard Medical School scientists have successfully restored vision in mice by turning back the clock on aged eye cells in the retina to recapture youthful gene function. The team's work, described today in Nature, represents the first demonstration that it may be possible to safely reprogram complex tissues, such as the nerve cells of the eye, to an earlier age. In addition to resetting the cells' aging clock, the researchers successfully reversed vision loss in animals with a condition mimicking human glaucoma, a leading cause of blindness around the world.

The achievement represents the first successful attempt to reverse glaucoma-induced vision loss, rather than merely stem its progression, the team said. If replicated through further studies, the approach could pave the way for therapies to promote tissue repair across various organs and reverse aging and age-related diseases in humans. Sinclair and colleagues caution that the findings remain to be replicated in further studies, including in different animal models, before any human experiments. Nonetheless, they add, the results offer a proof of concept and a pathway to designing treatments for a range of age-related human diseases.

For their work, the team used an adeno-associated virus (AAV) as a vehicle to deliver into the retinas of mice three youth-restoring genes -- Oct4, Sox2 and Klf4 -- that are normally switched on during embryonic development. The three genes, together with a fourth one, which was not used in this work, are collectively known as Yamanaka factors. The treatment had multiple beneficial effects on the eye. First, it promoted nerve regeneration following optic-nerve injury in mice with damaged optic nerves. Second, it reversed vision loss in animals with a condition mimicking human glaucoma. And third, it reversed vision loss in aging animals without glaucoma.

"The Wall Street Journal is reporting that Pfizer is planning to cut their shipment of Covid-19 vaccines for 2020 in half due to supply-chain problems," writes Slashdot reader phalse phace. Axios (non-paywalled source) reports: The U.K. government has ordered 40 million doses of Pfizer-BioNTech's vaccine -- enough to inoculate some 20 million people. The companies now expect to ship 50 million vaccines by the end of 2020, per WSJ. "Based on current projections we expect to produce globally up to 50 million vaccine doses in 2020 and up to 1.3 billion doses in 2021," Pfizer spokesperson Kim Bencker told Axios.

"[S]caling up a vaccine at this pace is unprecedented, and we have made significant progress as we have moved forwards in the unknown," Bencker said. "And it's important to highlight that the outcome of the clinical trial was somewhat later than the initial projection requiring us to focus additional efforts on clinical trial production." Pfizer did not specify to the Journal what shortfalls over ingredients and raw materials -- which were sourced from Europe and the U.S. -- took place as production ramped up. For the record, Pfizer's vaccine has been shown to be more than 90% effective.

China's Chang'e spacecraft has lifted off from Oceanus Procellarum at 10:10 EST Thursday, carrying with it the first fresh lunar samples since 1976. Space.com reports: Six minutes later, the ascent spacecraft achieved lunar orbit, marking a huge milestone in the Chang'e 5 mission to return lunar samples to Earth. The ascent vehicle's job now is to meet up with the Chang'e 5 orbiter while still circling the moon, and then transfer its precious cargo to a return capsule for the journey home. That next stage is an extremely challenging rendezvousing and docking between the small ascent vehicle and the Chang'e 5 orbiter while orbiting the moon. The activity needs to be automated due to the time delay in communicating across the roughly 236,000 miles (380,000 kilometers) between the Earth and the moon.

The two spacecraft will begin a final approach sometime on Saturday (Nov. 5)and complete the docking 3.5 hours later. If all goes well, China will then prepare for the final leg of the journey to deliver the first lunar samples to Earth in 44 years. The lunar samples won't be coming home immediately however. The Chang'e 5 spacecraft will need to wait in lunar orbit for a number of days for a narrow window in which to fire its engines and head for Earth.

The careful timing of this trans-Earth injection maneuver will allow the orbiter to deliver the reentry module to Earth at the precise time in order to land in Siziwang Banner, Inner Mongolia -- the same site used by the China National Space Administration to return astronauts home aboard Shenzhou spacecraft. The journey back to Earth will last 112 hours -- just over four and a half days -- before the reentry attempt. As spacecraft returning from the moon are traveling faster than those reentering from low Earth orbit, such as trips from the International Space Station, the Chang'e 5 reentry module will bounce off the atmosphere once to help it slow down before taking a final, fiery plunge to Earth.

A reader shares a report from The Verge: Today, the National Science Foundation (NSF) released shocking footage of the collapse of the Arecibo Observatory in Puerto Rico. The video, captured on December 1st, shows the moment when support cables snapped, causing the massive 900-ton structure suspended above Arecibo to fall onto the observatory's iconic 1,000-foot-wide dish.

The videos of the collapse were captured by a camera located in Arecibo's Operations Control Center, as well as from a drone located above the platform at the time of collapse. The operator of the drone was able to adjust the drone camera once the platform started to fall and capture the moment of impact. NSF, which oversees Arecibo, had been doing hourly monitoring of the observatory with drones, ever since engineers warned that the structure was on the verge of collapsing in November. The footage highlights the moment when multiple cables snapped, causing the platform to swing outward and hit the side of the dish. The collapse also brought down the tops of the three support towers surrounding Arecibo, where the cables had been connected to keep the platform in the air. Slashdot reader joshgs shares a petition to rebuild the Arecibo Observatory. "On December 1, the platform of the 305-meter radio telescope at Arecibo Observatory suffered a catastrophic collapse," the petition states. "This telescope had many capabilities that cannot be replaced by any existing or planned facility. It had the world's most powerful and most sensitive planetary radar system, providing unparalleled capacity to track and characterize near-Earth asteroids. The telescope was also a source of tourism, education, and pride for the people of Puerto Rico, inspiring many to pursue careers in science and technology."

"We ask Congress to allocate funding to build a new Arecibo radio telescope with greater capabilities than the previous telescope -- to maintain American leadership in planetary defense, astronomy, and ionospheric studies; and to inspire a new generation of scientists."

AstraZeneca and Oxford University have given conflicting accounts of how they came upon the most effective dosing pattern for their COVID-19 vaccine, a rare instance of public dissension between major institutions collaborating on a pivotal project. From a report: The discrepancy, reported for the first time by Reuters, centres on the regimen administered to a smaller group of volunteers in the late-stage trials, of half a dose followed by a full dose. This diverged from the original plan of two full doses, given to the majority of participants. The half-dose pattern was found to be 90% effective, versus the 62% success rate of the two-full-dose main study, based on interim data. AstraZeneca's research chief told Reuters 10 days ago, when interim trial data was released, the half-dose was given inadvertently as a first shot to some trial participants, and emerged as a stroke of fortune -- "serendipity" -- that scientists expertly harnessed.

This narrative was refuted by a leading Oxford University scientist, however, who told Reuters on Monday that the half-dose shot was given deliberately after thorough consultations. Uncertainty over how the dosing regimen came about raises questions about the robustness of the data, according to some experts who said it risked slowing down the process of gaining regulatory approval for the shot and denting public confidence. "These differing accounts are worrying," Eleanor Riley, a professor of immunology and infectious disease at the University of Edinburgh, told Reuters. "Trust is at a premium when it comes to vaccines and we must not do anything that might in any way undermine it."

An anonymous reader shares a report: Dec. 2 was the 25th anniversary of the Solar and Heliospheric Observatory (SOHO), a joint project from NASA and the European Space Agency. To celebrate, the agencies released a dramatic, nearly 50-minute-long video showing the sun blasting out solar material from 1998 through 2020. The SOHO spacecraft constantly stares at the sun, recording its every whim. It's spectacular and mesmerizing. "What becomes clear as the sun turns and years pass and background stars whirl by, is how constant the stream of material is that is blasted in all directions -- the solar wind," ESA said in a statement on Wednesday. "This constant wind is interrupted only by huge explosions that fling bows of material at vast speeds, filling the solar system with ionized material and solar radiation."

With vaccines against Covid-19 on the verge of being rolled out around the world, Facebook said it will start removing false claims about the immunizations that have been debunked by public health experts. From a report: The move announced Thursday adds to Facebook's policy of taking down misinformation about the deadly virus that could lead to imminent physical harm. The type of posts that could be removed on Facebook or Instagram include false claims about the safety, efficacy, ingredients or side effects of the vaccine, Facebook said. These could include claims that the vaccines contain microchips or anything else not on the official ingredient list. In October, Facebook said it would ban ads that discourage people from getting vaccines in general, not just for Covid.

Natalie Wolchover writes via Quanta Magazine: As fundamental constants go, the speed of light, c, enjoys all the fame, yet c's numerical value says nothing about nature; it differs depending on whether it's measured in meters per second or miles per hour. The fine-structure constant, by contrast, has no dimensions or units. It's a pure number that shapes the universe to an astonishing degree -- "a magic number that comes to us with no understanding," as Richard Feynman described it. Paul Dirac considered the origin of the number "the most fundamental unsolved problem of physics."

Numerically, the fine-structure constant, denoted by the Greek letter a (alpha), comes very close to the ratio 1/137. It commonly appears in formulas governing light and matter. [...] The constant is everywhere because it characterizes the strength of the electromagnetic force affecting charged particles such as electrons and protons. Because 1/137 is small, electromagnetism is weak; as a consequence, charged particles form airy atoms whose electrons orbit at a distance and easily hop away, enabling chemical bonds. On the other hand, the constant is also just big enough: Physicists have argued that if it were something like 1/138, stars would not be able to create carbon, and life as we know it wouldn't exist.

Today, in a new paper in the journal Nature, a team of four physicists led by Saida Guellati-Khelifa at the Kastler Brossel Laboratory in Paris reported the most precise measurement yet of the fine-structure constant. The team measured the constant's value to the 11th decimal place, reporting that a = 1/137.03599920611. (The last two digits are uncertain.) With a margin of error of just 81 parts per trillion, the new measurement is nearly three times more precise than the previous best measurement in 2018 by Muller's group at Berkeley, the main competition. (Guellati-Khelifa made the most precise measurement before Muller's in 2011.) Muller said of his rival's new measurement of alpha, "A factor of three is a big deal. Let's not be shy about calling this a big accomplishment."

Singapore has granted San Francisco start-up Eat Just Inc. regulatory approval to sell its laboratory-grown chicken in the city-state -- the world's first government to allow the sale of cultured meat. CNN reports: The product, created from cultured chicken cells, has been approved as an ingredient in chicken bites following Singapore Food Agency (SFA) approval, Eat Just said Tuesday. Initially, the chicken bites will debut in a Singapore restaurant, with plans for wider expansion into dining and retail establishments in the country, Josh Tetrick, co-founder and CEO of Eat Just told CNN Business. The product will be priced at parity with premium chicken, he added.

The cultured meat is created in a bioreactor -- an apparatus in which a biological reaction or change takes place -- Eat Just said. It has a high protein content and is a rich source of minerals, according to the company, which plans to sell the product under the GOOD Meat brand. For now, with manufacturing hubs in Singapore and Northern California, the company only has approval to sell the meat in Singapore, but it hopes to expand sales of cultured meat -- including cultured beef -- into the US and Western Europe, Tetrick said.

AmiMoJo shares a report from the BBC: The winning numbers in South Africa's national lottery have caused a stir and sparked accusations of fraud over their unusual sequence. Tuesday's PowerBall lottery saw the numbers five, six, seven, eight and nine drawn, while the Powerball itself was, you've guessed it, 10. Some South Africans have alleged a scam and an investigation is under way. The organizers said 20 people purchased a winning ticket and won 5.7 million rand ($370,000; 278,000 pounds) each. Another 79 ticketholders won 6,283 rand each for guessing the sequence from five up to nine but missing the PowerBall.

The chances of winning South Africa's PowerBall lottery are one in 42,375,200 -- the number of different combinations when selecting five balls from a set of 50, plus an additional bonus ball from a pool of 20. The odds of the draw resulting in the numbers seen in Tuesday's televised live event are the same as any other combination. Competitions resulting in multiple winners are rare, but this may have something to do with this particular sequence.

Hope Thelps shares a report: The UK has become the first country in the world to approve the Pfizer/BioNTech coronavirus vaccine, paving the way for mass vaccination. Britain's medicines regulator, the MHRA, says the jab, which offers up to 95% protection against Covid-19 illness, is safe to be rolled out. The first doses are already on their way to the UK, with 800,000 due in the coming days, Pfizer said. Health Secretary Matt Hancock said the NHS will contact people about jabs. Elderly people in care homes and care home staff have been placed top of the priority list, followed by over-80s and health and care staff. But because hospitals already have the facilities to store the vaccine at -70C, as required, the very first vaccinations are likely to take place there -- for care home staff, NHS staff and patients -- so none of the vaccine is wasted. The Pfizer/BioNTech jab is the fastest vaccine to go from concept to reality, taking only 10 months to follow the same steps that normally span 10 years. The UK has already ordered 40 million doses of the jab - enough to vaccinate 20 million people. The doses will be rolled out as quickly as they can be made by Pfizer in Belgium, Mr Hancock said, with the first load next week and then "several millions" throughout December. Scottish First Minister Nicola Sturgeon said the first people in Scotland will be immunised on Tuesday.