A marine biologist's ideas for singling out sharks that attack humans have prompted objections from other shark scientists. From a report: The war on sharks has been waged with shock and awe at times. When a shark bit or killed a swimmer, people within the past century might take out hundreds of the marine predators to quell the panic, like executing everyone in a police lineup in order to ensure justice was dispensed on the guilty party. Eric Clua, a professor of marine biology at the Ecole Pratique des Hautes Etudes in Paris, said the rationale behind shark culls in the past was simple: fewer sharks, fewer attacks. That reasoning also drives methods such as shark nets and baited hooks, which are currently in use at a number of Australian and South African beaches that are frequently visited by sharks. Nature, he notes, pays too great a price. "They are killing sharks that are guilty of nothing," said Dr. Clua, who studies the ocean predators up close in the South Pacific.

Dr. Clua said he has found a way to make precision strikes on sharks that have attacked people through a form of DNA profiling he calls "biteprinting." He believes it's usually just solo "problem sharks" that attack humans repeatedly, analogizing them to terrestrial predators that have been documented behaving the same way. Instead of culling every bear, tiger or lion when only one has serially attacked people, wildlife managers on land usually focus their ire on the culprit. Dr. Clua said that problem sharks could be dispatched the same way. This summer, Dr. Clua and several colleagues published their latest paper on collecting DNA from the biteprints of large numbers of sharks. Once a database is built, DNA could be collected from the wounds of people who were bitten by sharks, and matched to a known shark. The offending fish would then need to be found and killed. Critics have taken issue with every facet of this plan.

An anonymous reader shares a report: A ten-year longitudinal study published in the Journal of Cyberpsychology, Behavior, and Social Networking on a group in early adolescence from as young as ten years old, investigated how playing violent video games at an early age would translate into adulthood behavior (23 years of age). Titled "Growing Up with Grand Theft Auto: A 10-Year Study of Longitudinal Growth of Violent Video Game Play in Adolescents" the study found no correlation between growing up playing video games and increased levels of aggression ten years later. This particular study utilized a more contemporary approach for analyzing its data, known as the person-centered approach. Traditional studies use a variable-centered approach whereby researchers treat each variable, or characteristic, as related to another variable. An example would be that exercising is related to a reduced incidence of heart disease. This has been particularly valuable when comparing groups. In a person-centered approach researchers combine various algorithms across variables to determine how these variables compare among individuals. This approach provides a more accurate depiction of how variables relate to the individual.

Japan's Mitsubishi Heavy Industries will soon complete in Austria the world's largest steel plant capable of attaining net-zero carbon dioxide emissions. Mitsubishi Heavy, through a British unit, is constructing the pilot plant at a complex of Austrian steelmaker Voestalpine. Trial operation is slated to begin in 2021. From a report: The plant will use hydrogen instead of coal in the reduction process for iron ore. The next-generation equipment will produce 250,000 tons of steel product a year. The global steel industry generated about 2 billion tons of CO2 in 2018, according to the International Energy Agency -- double the volume in 2000. The steel sector's share among all industries grew 5 percentage points to 25%. Iron ore reduction accounts for much of the CO2 emissions in steelmaking. Japanese steelmakers including Nippon Steel are developing hydrogen-consuming reduction processes based on the conventional blast furnace design. Mitsubishi Heavy's plant adopts a process called direct reduced iron, or DRI. New blast furnaces require trillions of yen (1 trillion yen equals $9.6 billion) in investment. Although DRI equipment produces less steel, the investment is estimated at less than half of blast furnaces. For DRI to attain the same level of cost-competitiveness as blast furnaces, low-cost hydrogen will be key. Market costs for hydrogen now stand at around 100 yen per normal cu. meter, estimates the Ministry of Economy, Trade and Industry.

SpaceX will try a significantly different approach to landing its future reusable rocket boosters, according to CEO and founder Elon Musk. It will attempt to 'catch' the heavy booster, which is currently in development, using the launch tower arm used to stabilize the vehicle during its pre-takeoff preparations. From a report: Current Falcon 9 boosters return to Earth and land propulsively on their own built-in legs -- but the goal with Super Heavy is for the larger rocket not to have legs at all, says Musk. The Super Heavy launch process will still involve use of its engines to control the velocity of its descent, but it will involve using the grid fins that are included on its main body to help control its orientation during flight to 'catch' the booster -- essentially hooking it using the launch tower arm before it touches the ground at all. The main benefits of this method, which will obviously involve a lot of precision maneuvering, is that it means SpaceX can save both cost and weight by omitting landing legs from the Super Heavy design altogether. Another potential benefit raised by Musk is that it could allow SpaceX to essentially recycle the Super Heavy booster immediately back on the launch mount it returns to -- possibly enabling it to be ready to fly again with a new payload and upper stage (consisting of Starship, the other spacecraft SpaceX is currently developing and testing) in "under an hour." The goal for Starship and Super Heavy is to create a launch vehicle that's even more reusable than SpaceX's current Falcon 9 (and Falcon Heavy) system.

Eric Bangeman, writing for ArsTechnica: Despite over 82 million cases and over 1.75 million deaths due to COVID-19, many people are bound and determined to carry on with normal life. For some, that includes attending Saturday night ragers, just like they did in the Before Times. Reports of yet another secret party being broken up by law enforcement have become distressingly common. Getting guests for these secret parties is at least slightly more difficult now that Apple has pulled Vybe Together -- an app with a tagline that invited users to "get their party on" -- from the App Store. The Verge pointed out that the app had largely been flying under the radar until a tweet from Taylor Lorenz of the New York Times brought some unwelcome, but much-needed scrutiny to the app. One of Lorenz's tweets highlighted Vybe Together's TikTok account, which had posted videos of unmasked people partying indoors while advertising New Years Eve parties. According to Business Insider, TikTok has since removed Vybe Together's account for violating community guidelines.

Joe2020 shares a report: A Japanese company and Kyoto University have joined forces to develop what they hope will be the world's first satellites made out of wood by 2023. Sumitomo Forestry said it has started research on tree growth and the use of wood materials in space. The partnership will begin experimenting with different types of wood in extreme environments on Earth. Space junk is becoming an increasing problem as more satellites are launched into the atmosphere. Wooden satellites would burn up without releasing harmful substances into the atmosphere or raining debris on the ground when they plunge back to Earth. "We are very concerned with the fact that all the satellites which re-enter the Earth's atmosphere burn and create tiny alumina particles which will float in the upper atmosphere for many years," Takao Doi, a professor at Kyoto University and Japanese astronaut, told the BBC. "Eventually it will affect the environment of the Earth. The next stage will be developing the engineering model of the satellite, then we will manufacture the flight model."

Neptune boasts some of the strangest weather in the solar system. The sun's eighth planet holds the record for the fastest winds observed on any world, with speeds cutting through the atmosphere upward of 1,100 miles per hour, or 1.5 times the speed of sound. Scientists still don't know exactly why its atmosphere is so tumultuous. Their latest glimpse of Neptune provided even more reason to be confused. From a report: The Hubble Space Telescope identified a storm in 2018, a dark spot some 4,600 miles across. Since that time, it appears to have drifted toward the equator but then swooped back up north, according to the latest Hubble observations. It also has a smaller companion storm, nicknamed Dark Spot Jr., that scientists think might be a chunk that broke off the main storm. These inky vortexes stand out against the dizzying cerulean blue of the planet, but while they're dazzling to see, their life spans are short, making them even more challenging to study.

This is not the first time Neptune's dark spots have behaved so strangely. When the Voyager 2 spacecraft flew past the planet in 1989, (still the only spacecraft to do so) it observed two storms. One was the original Dark Spot, a large vortex about the size of the Earth. It too had a companion, a smaller, fast moving storm nicknamed Scooter. The first observed Dark Spot also seemed to move south and then back to the north. "When we were tracking the great dark spot with Voyager, we saw it oscillating up and down in longitude," said Heidi Hammel, a member of the imaging team of the Voyager 2 space probe and currently the vice president for science at the Association of Universities for Research in Astronomy. "We had enough time on Voyager, that we were able to track the feature for something like four to five months leading up to the flyby. That storm was huge, a big monster," as big as planet Earth.

Siobhan Roberts, writing for The New York Times: In March of 1970, Martin Gardner opened a letter jammed with ideas for his Mathematical Games column in Scientific American. Sent by John Horton Conway, then a mathematician at the University of Cambridge, the letter ran 12 pages, typed hunt-and-peck style. Page 9 began with the heading "The game of life." It described an elegant mathematical model of computation -- a cellular automaton, a little machine, of sorts, with groups of cells that evolve from iteration to iteration, as a clock advances from one second to the next. Dr. Conway, who died in April, having spent the latter part of his career at Princeton, sometimes called Life a "no-player, never-ending game." Mr. Gardner called it a "fantastic solitaire pastime." The game was simple: Place any configuration of cells on a grid, then watch what transpires according to three rules that dictate how the system plays out.

Birth rule: An empty, or "dead," cell with precisely three "live" neighbors (full cells) becomes live.
Death rule: A live cell with zero or one neighbors dies of isolation; a live cell with four or more neighbors dies of overcrowding.
Survival rule: A live cell with two or three neighbors remains alive.
With each iteration, some cells live, some die and "Life-forms" evolve, one generation to the next. Among the first creatures to emerge was the glider -- a five-celled organism that moved across the grid with a diagonal wiggle and proved handy for transmitting information. It was discovered by a member of Dr. Conway's research team, Richard Guy, in Cambridge, England. The glider gun, producing a steady stream of gliders, was discovered soon after by Bill Gosper, then at the Massachusetts Institute of Technology.

Researchers may have found a way to reduce the environmental impact of air travel in situations when electric aircraft and alternative fuels aren't practical. Wired reports that Oxford University scientists have successfully turned CO2 into jet fuel, raising the possibility of conventionally-powered aircraft with net zero emissions. From a report: The technique effectively reverses the process of burning fuel by relying on the organic combustion method. The team heated a mix of citric acid, hydrogen and an iron-manganese-potassium catalyst to turn CO2 into a liquid fuel capable of powering jet aircraft. The approach is inexpensive, uncomplicated and uses commonplace materials. It's cheaper than processes used to turn hydrogen and water into fuel. There are numerous challenges to bringing this to aircraft. The lab method only produced a few grams of fuel -- you'd clearly need much more to support even a single flight, let alone an entire fleet. You'd need much more widespread use of carbon capture. And if you want effectively zero emissions, the capture and conversion systems would have to run on clean energy.

America's next president takes office in three weeks and two days. What changes should he make to America's space program? An opinion writer at Bloomberg tackles the question: Donald Trump badly wanted to be the president who sent Americans back to the moon. Instead, his administration has presided over Artemis, a lunar-landing program plagued by "uncertain plans, unproven cost assumptions, and limited oversight," according to a new watchdog report. Pieces of the program, including the SLS rocket and Orion spacecraft, are billions of dollars over budget, years past deadline and poised to eat into NASA's more promising projects. As a result, the U.S. space agency will almost certainly miss its goal of landing Americans on the moon again by 2024. President-elect Joe Biden inherits the task of deciding what to do next.

- He should focus on what has made the U.S. space program distinctive in recent years: the power of private competition...

- The government bears all the risk of missed deadlines and rising costs. A more efficient alternative is fixed-price contracts, in which a company keeps as profit whatever's left over after it completes its assigned task. Beginning in 2006, NASA has used such contracts to boost the development of private space companies capable of reaching the International Space Station. The initiative has worked far better than anyone could've expected. In a 2011 report, NASA expressed bewilderment that SpaceX, then a young upstart, managed to develop its workhorse Falcon 9 rocket for just $390 million — as opposed to a likely cost of $1.7 billion to $4 billion under traditional cost-plus assumptions. Today, the rocket delivers hardware and astronauts for companies and space agencies around the world. Come January, the Biden administration should take a similar approach to the troubled Artemis system. Step one should be eliminating SLS and Orion altogether in favor of cheaper private-sector alternatives....

Currently, there are a number of Artemis elements being developed under fixed-price contracts, including future lunar landers. The new administration should use a similar approach with as many aspects of the project as possible, thereby harnessing the efficiency and inventiveness of private competition.

Mashable reports: The Japan Aerospace Exploration Agency showed off a collection of samples from the asteroid Ryugu on Thursday following the return of the Hayabusa2 probe.

The black, gravelly samples from Ryugu contain a whole bunch of small chips collected from the asteroid's subsurface...

Normally, space rocks like these are collected after they enter Earth's atmosphere at surface-scorching speeds. These samples from Ryugu are the first ever that can be examined without being damaged during entry, which is key to getting a clear look at and better understanding these celestial rocks, according to a report from NPR.

Long-time Slashdot reader fahrbot-bot summarizes an article from LiveScience: There's a giant asteroid somewhere out in the solar system, and it hurled a big rock at Earth.

The evidence for this mystery space rock comes from a diamond-studded meteor that exploded over Sudan in 2008. NASA had spotted the 9-ton (8,200 kilograms), 13-foot (4 meters) meteor heading toward the planet well before impact, and researchers showed up in the Sudanese desert to collect an unusually rich haul of remains. Now, a new study of one of those meteorites suggests that the meteor may have broken off of a giant asteroid — one more or less the size of the dwarf planet Ceres, the largest object in the asteroid belt — that formed in the presence of water under intermediate temperatures and pressures.

The mineral makeup of these space rocks offers clues about the "parent asteroid" that birthed a given meteor, researchers said in a statement.

The New York Times reports on results from a rigorous five-year study in Trondheim, Norway that raises the question: If you increase your heart rate, will your life span follow? The study, one of the largest and longest-term experimental examinations to date of exercise and mortality, shows that older men and women who exercise in almost any fashion are relatively unlikely to die prematurely. But if some of that exercise is intense, the study also finds, the risk of early mortality declines even more, and the quality of people's lives climbs...

Their first step was to invite every septuagenarian in Trondheim to participate... More than 1,500 of the Norwegian men and women accepted... All agreed to start and continue to exercise more regularly during the upcoming five years... The first group, as a control, agreed to follow standard activity guidelines and walk or otherwise remain in motion for half an hour most days. (The scientists did not feel they could ethically ask their control group to be sedentary for five years.) Another group began exercising moderately for longer sessions of 50 minutes twice a week. And the third group started a program of twice-weekly high-intensity interval training, or HIIT, during which they cycled or jogged at a strenuous pace for four minutes, followed by four minutes of rest, with that sequence repeated four times... During that time, the scientists noted that quite a few of the participants in the control had dabbled with interval-training classes at local gyms, on their own initiative and apparently for fun...

After five years, the researchers checked death registries and found that about 4.6 per cent of all of the original volunteers had passed away during the study, a lower number than in the wider Norwegian population of 70-year-olds, indicating these active older people were, on the whole, living longer than others of their age. But they also found interesting, if slight, distinctions between the groups. The men and women in the high-intensity-intervals group were about 2 per cent less likely to have died than those in the control group, and 3 per cent less likely to die than anyone in the longer, moderate-exercise group. People in the moderate group were, in fact, more likely to have passed away than people in the control group.

The men and women in the interval group also were more fit now and reported greater gains in their quality of life than the other volunteers....

Dorthe Stensvold, a researcher at the Norwegian University of Science and Technology who led the new study, believes the study's message can be broadly applicable to almost all of us.. "Adding life to years, not only years to life, is an important aspect of healthy ageing, and the higher fitness and health-related quality of life from high-intensity interval training in this study is an important finding."

The New York Times reports: Ever since the race to develop a coronavirus vaccine began last spring, upbeat announcements were stalked by ominous polls: No matter how encouraging the news, growing numbers of people said they would refuse to get the shot... But over the past few weeks, as the vaccine went from a hypothetical to a reality, something happened. Fresh surveys show attitudes shifting and a clear majority of Americans now eager to get vaccinated. In polls by Gallup, the Kaiser Family Foundation and the Pew Research Center, the portion of people saying they are now likely or certain to take the vaccine has grown from about 50 per cent this summer to more than 60 per cent, and in one poll 73 per cent — a figure that approaches what some public health experts say would be sufficient for herd immunity...

[T]he attitude improvement is striking. A similar shift on another heated pandemic issue was reflected in a different Kaiser poll this month. It found that nearly 75 per cent of Americans are now wearing masks when they leave their homes.

The change reflects a constellation of recent events: the uncoupling of the vaccine from Election Day; clinical trial results showing about 95 per cent efficacy and relatively modest side effects for the vaccines made by Pfizer-BioNTech and Moderna; and the alarming surge in new coronavirus infections and deaths... The lure of the vaccines' modest quantities also can't be underestimated as a driver of desire, somewhat like the must-have frenzy generated by a limited-edition Christmas gift, according to public opinion experts... A barrage of feel-good media coverage, including rapt attention given to leading scientists and politicians when they get jabbed and joyous scrums surrounding local health care workers who become the first to be vaccinated, has amplified the excitement, public opinion experts say.

Reuters notes the "miraculous speed" of mRNA vaccines, while also calling it "a glimpse of what's possible if it can be applied post-pandemic to treat cancer or rare diseases."

The vaccine market alone is worth about $35 billion each year, and investors apparently believe mRNA companies will capture around two-third of that, leading market researcher Bernstein to evalaute the combined worth of mRNA companies at nearly $180 billion. The technology is the closest thing yet to making medicine digital. MRNA vaccines essentially inject genetic code that instructs a recipients' cells to construct a part of the virus. The body recognizes the produced protein as foreign and mounts a future immune response when exposed. Moderna and BioNTech's vaccines show the technology works fast. Vaccines typically take a decade to develop. They took less than a year...

The speed of mRNA therapeutics is a big advantage. For example, flu vaccines only reduce the risk of illness by up to 60% because makers must guess which strains will be prevalent each season. Sometimes they're wrong. Shaving months off means better guesses, and higher efficacy.

The bigger opportunity comes from the validation of the mRNA "platform". Instructing cells to produce desired proteins could lead to multiple advances. Perhaps they can instruct the body to more vigorously attack cancerous cells or repair damaged tissue. Producing missing proteins might fight inherited diseases...

Success against Covid-19 means these companies will be flush with cash from sales and attract partnerships and scientific talent. That should make 2021 a watershed.

Weighing up to 380,000 pounds and stretching some 100 feet long, the blue whale -- the largest creature to have ever lived on Earth -- might at first seem difficult for human eyes and ears to miss. But a previously unknown population of the leviathans has long been lurking in the Indian Ocean, leaving scientists none the wiser, new research suggests. From a report: The covert cadre of whales, described in a paper published last week in the journal Endangered Species Research, has its own signature anthem: a slow, bellowing ballad that's distinct from any other whale song ever described. It joins only a dozen or so other blue whale songs that have been documented, each the calling card of a unique population. "It's like hearing different songs within a genre -- Stevie Ray Vaughan versus B. B. King," said Salvatore Cerchio, a marine mammal biologist at the African Aquatic Conservation Fund in Massachusetts and the study's lead author. "It's all blues, but you know the different styles."

The find is "a great reminder that our oceans are still this very unexplored place," said Asha de Vos, a marine biologist who has studied blue whales in the Indian Ocean but was not involved in the new study. Dr. Cerchio and his colleagues first tuned into the whales' newfound song while in scientific pursuit of a pod of Omura's whales off the coast of Madagascar several years ago. After hearing the rumblings of blue whales via a recorder planted on the coastal shelf, the researchers decided to drop their instruments into deeper water in the hopes of eavesdropping further. A number of blue whale populations, each with its own characteristic croon, have long been known to visit this pocket of the Indian Ocean, Dr. Cerchio said. But one of the songs that crackled through the team's Madagascar recordings was unlike any the researchers had heard.

An anonymous reader shares a feature report: At the end of 2019, before the coronavirus pandemic started, the two best-known faces of the pharmaceutical business were the imprisoned Martin Shkreli and the lawsuit-laden opioid makers at Purdue Pharma. The rest of the industry was perhaps best known for the skyrocketing prices of its medicines. In a Gallup Poll of the public's view of various business sectors, pharma was ranked at the bottom, behind the oil industry, advertising and public relations, and lawyers. Who'd have guessed that a year later pharma would be getting credit for saving the world?

From cruise lines to meatpackers, business will have plenty to answer for in its handling of the pandemic, but this part of it worked. The Covid-19 vaccines developed by the drug industry, in partnership with governments, will almost certainly prevent hundreds of thousands of American deaths and millions more around the world. They will revive trillions of dollars in economic activity, let grandparents see grandchildren, and finally bring an end to a year that has -- sing it together one last time as the ball drops over an empty Times Square -- really sucked. In a time where almost everything else went wrong, the vaccine effort was something that went (mostly) right.

A growing number of "cryptic species" hiding in plain sight have been unmasked in the past year, driven in part by the rise of DNA barcoding, a technique that can identify and differentiate between animal and plant species using their genetic divergence. From a report: The discovery of new species of aloe, African leaf-nosed bats and chameleons that appear similar to the human eye but are in fact many and separate have thrilled and worried conservationists. Scientists say our planet might be more biologically diverse than previously thought, and estimates for the total number of species could be far higher than the current best guess of 8.7 million. But cryptic discoveries often mean that species once considered common and widespread are actually several, some of which may be endangered and require immediate protection.

The Jonah's mouse lemur was only unveiled to the world this summer but is already on the verge of extinction. The newly described Popa langur in Myanmar, previously confused with another species, numbers around 200 and is likely to be classified as critically endangered, threatened by habitat loss and deforestation. The discovery of these cryptic species has been driven in part by the rise of DNA barcoding, a technique that can identify and differentiate between animal and plant species using their genetic divergence. African elephants, Indian vine snakes and South American neotropical birds are among the growing number of unmaskings. Thousands more are expected in the coming years, from living creatures and museum samples.

The Korea Superconducting Tokamak Advanced Research(KSTAR), a superconducting fusion device also known as the Korean artificial sun, set the new world record as it succeeded in maintaining the high temperature plasma for 20 seconds with an ion temperature over 100 million degrees. Phys.Org reports: On November 24 (Tuesday), the KSTAR Research Center at the Korea Institute of Fusion Energy (KEF) announced that in a joint research with the Seoul National University (SNU) and Columbia University of the United States, it succeeded in continuous operation of plasma for 20 seconds with an ion-temperature higher than 100 million degrees, which is one of the core conditions of nuclear fusion in the 2020 KSTAR Plasma Campaign. It is an achievement to extend the 8 second plasma operation time during the 2019 KSTAR Plasma Campaign by more than 2 times. In its 2018 experiment, the KSTAR reached the plasma ion temperature of 100 million degrees for the first time (retention time: about 1.5 seconds)

To re-create fusion reactions that occur in the sun on Earth, hydrogen isotopes must be placed inside a fusion device like KSTAR to create a plasma state where ions and electrons are separated, and ions must be heated and maintained at high temperatures. In its 2020 experiment, the KSTAR improved the performance of the Internal Transport Barrier(ITB) mode, one of the next generation plasma operation modes developed last year and succeeded in maintaining the plasma state for a long period of time, overcoming the existing limits of the ultra-high-temperature plasma operation.

fahrbot-bot shares a report from Phys.Org: Researchers from Tokyo Metropolitan University have discovered a way to make self-assembled nanowires of transition metal chalcogenides at scale using chemical vapor deposition. By changing the substrate where the wires form, they can tune how these wires are arranged, from aligned configurations of atomically thin sheets to random networks of bundles. This paves the way to industrial deployment in next-gen industrial electronics, including energy harvesting, and transparent, efficient, even flexible devices.

Using a process called chemical vapor deposition (CVD), they found that they could assemble TMC nanowires in different arrangements depending on the surface or substrate that they use as a template. Examples are shown in Figure 2; in (a), nanowires grown on a silicon/silica substrate form a random network of bundles; in (b), the wires assemble in a set direction on a sapphire substrate, following the structure of the underlying sapphire crystal. By simply changing where they are grown, the team now have access to centimeter-sized wafers covered in the arrangement they desired, including monolayers, bilayers and networks of bundles, all with different applications. They also found that the structure of the wires themselves were highly crystalline and ordered, and that their properties, including their excellent conductivity and 1D-like behavior, matched those found in theoretical predictions. The research has been published in the journal Nano Letters.