Slashdot reader sciencehabit shares this report from Science magazine: Fifty years ago, famed physicist Stephen Hawking wrote down an equation that predicts that a black hole has entropy, an attribute typically associated with the disordered jumbling of atoms and molecules in materials.

The arguments for black hole entropy were indirect, however, and no one had derived the famous equation from the fundamental definition of entropy — at least not for realistic black holes. Now, one team of theorists claims to have done so, although some experts are skeptical.

Reported in a paper in press at Physical Review Letters, the work would solve a homework problem that some theorists have labored over for decades. "It's good to have it done," says Don Marolf, a gravitational theorist at the University of California, Santa Barbara who was not involved in the research. It "shows us how to move forward, that's great."

The European Space Agency has a Planetary Defence Office, which includes its Near-Earth Object Coordination Centre. "It has come to our attention," they wrote in the April edition of their monthly newsletter, "that a recent trend among journalists has been to come up with creative comparisons to convey the size of an asteroid to the public."

So then, as explained by RockDoctor (Slashdot reader #15,477) "they propose a number of standardised units of comparison for journalists describing 'death from the skies'".

An excerpt from that April 1 newsletter: In the absence of a handy skyscraper, animals commonly used have included giraffes, corgis and an entire colony of penguins. But how do these comparisons stack up? Let's look at some of our favourite unusual suspects:

- Corgi: At around 30 cm tall, a space rock the size of a corgi wouldn't pose much of a threat.

- Half a giraffe: An adult giraffe can reach up to 5.5 metres in height, so half a giraffe would be about 2.75 metres. While not as impressive as a full skyscraper, an asteroid that size could certainly destroy a building or two...

- Elephants: An adult African elephant can reach 7 metres at the shoulder. Ninety elephants stacked on top of each other would form a staggering pile over 630 metres high, creating a devastating but probably not planet-ending event.

As this menagerie of animals can cause a lot of confusion, we at the NEOCC recommend the use of a Standardised Giraffe Unit (SGU, 1 SGU = 5 penguins) for ease of comparison.
RockDoctor shares this additional thought in his original submission about the newly proposed standardized unit.

"The world may be turtles all the way down, but it's giraffes all the way up."

NASA engineers have traced the Voyager 1 spacecraft's transmitted gibberish to corrupted memory hardware in its flight data system (FDS). "The team suspects that a single chip responsible for storing part of the affected portion of the FDS memory isn't working," NASA wrote in an update. Gizmodo reports: FDS collects data from Voyager's science instruments, as well as engineering data about the health of the spacecraft, and combines them into a single package that's transmitted to Earth through one of the probe's subsystems, the telemetry modulation unit (TMU), in binary code. FDS and TMU have been having trouble communicating with one another. As a result, TMU has been sending data to mission control in a repeating pattern of ones and zeroes. NASA's engineers aren't quite sure what corrupted the FDS memory hardware; they think that either the chip was hit by an energetic particle from space or that it's just worn out after operating for 46 years. [...] The engineers are hoping to resolve the issue by finding a way for FDS to operate normally without the corrupted memory hardware, enabling Voyager 1 to begin transmitting data about the cosmos and continue its journey through deep space.

Whenever a rocket launch occurs, air traffic controllers ensure the safety of commercial flights by managing airspace closures and monitoring rocket debris, without receiving compensation from commercial space companies like SpaceX for these services. The Biden administration's budget proposal aims to change this by suggesting that for-profit space companies begin paying for their use of government air traffic control resources. The New York Times reports: Commercial space companies are exempt from aviation excise taxes that fill the coffers of the Airport and Airway Trust Fund, which pays for the F.A.A.'s work and will get roughly $18 billion in tax revenues for the current fiscal year. The taxes are paid primarily by commercial airlines, which are charged 7.5 percent of each ticket price and an additional fee of about $5 to $20 per passenger, depending on the destination of each flight. Mr. Biden's budget proposal vows to work with Congress to overhaul the tax structure and split the cost of operating the nation's air traffic control system. His promise is based in part on an independent safety review report commissioned by the F.A.A., which advises that the federal government update the excise taxes to charge commercial space companies.

Mr. Biden's call for revising the decades-old excise tax structure is part of his push to make richer Americans and wealthy corporations "pay their fair share." In his State of the Union speech last month, Mr. Biden also called for raising taxes on private and corporate jet users, including increasing the tax that they pay on jet fuel to $1.06 per gallon from 21.8 cents per gallon over five years. That tax on fuel currently makes up around 3 percent of the annual revenue of the trust fund, which depends heavily on what commercial airlines and its passengers pay. Yet commercial space companies do not contribute to that fund or share any of the cost that the public bears when rockets are launched, said William J. McGee, a former F.A.A.-licensed aircraft dispatcher and a senior fellow at the American Economic Liberties Project, a consumer advocacy group. "This is a question of fundamental fairness," Mr. McGee said. "It would be the equivalent of having a toll system on a highway and waving through certain users and not others."

Elizabeth Rayne reports via Ars Technica: Led by planetary researcher Lonneke Roelofs of Utrecht University in the Netherlands, a team of scientists has found that the sublimation of CO2 ice could have shaped Martian gullies, which might mean the most recent occurrence of liquid water on Mars may have been further back in time than previously thought. That could also mean the window during which life could have emerged and thrived on Mars was possibly smaller. "Sublimation of CO2 ice, under Martian atmospheric conditions, can fluidize sediment and creates morphologies similar to those observed on Mars," Roelofs and her colleagues said in a study recently published in Communications Earth & Environment. [...]

To recreate a part of the red planet's landscape in a lab, Roelofs built a flume in a special environmental chamber that simulated the atmospheric pressure of Mars. It was steep enough for material to move downward and cold enough for CO2 ice to remain stable. But the team also added warmer adjacent slopes to provide heat for sublimation, which would drive movement of debris. They experimented with both scenarios that might happen on Mars: heat coming from beneath the CO2 ice and warm material being poured on top of it. Both produced the kinds of flows that had been hypothesized. For further evidence that flows driven by sublimation would happen under certain conditions, two further experiments were conducted, one under Earth-like pressures and one without CO2 ice. No flows were produced by either. "For the first time, these experiments provide direct evidence that CO2 sublimation can fluidize, and sustain, granular flows under Martian atmospheric conditions," the researchers said in the study.

Because this experiment showed that gullies and systems like them can be shaped by sublimation and not just liquid water, it raises questions about how long Mars had a sufficient supply of liquid water on the surface for any organisms (if they existed at all) to survive. Its period of habitability might have been shorter than it was once thought to be. Does this mean nothing ever lived on Mars? Not necessarily, but Roelofs' findings could influence how we see planetary habitability in the future.

The biggest ever 3D map of the universe, featuring more than 6m galaxies, has been revealed by scientists who said it raised questions about the nature of dark energy and the future of the universe. From a report: The map is based on data collected by the Dark Energy Spectroscopic Instrument (Desi) in Arizona and contains three times as many galaxies as previous efforts, with many having their distances measured for the first time. Researchers said that by using this map, they have been able measure how fast the universe has been expanding at different times in the past with unprecedented accuracy.

The results confirm that the expansion of the universe is speeding up, they added. However, the findings have also raised the tantalising possibility that dark energy -- a mysterious, repulsive force that drives the process -- is not constant throughout time as has previously been suggested. Dr Seshadri Nadathur, a co-author of the work and senior research fellow at the University of Portsmouth's Institute of Cosmology and Gravitation, said: "What we are seeing are some hints that it has actually been changing over time, which is quite exciting because it is not what the standard model of a cosmological constant dark energy would look like."

Prof Carlos Frenk, from Durham University and a co-author of the research, said that if dark energy was indeed constant in time, the future of the universe was simple: it would expand on and on, for ever. But if the hints found in the map stood up, that would be called into question. The research, which has been published in a series of preprints â" meaning it has yet to be peer-reviewed â" reveals how the team first created the 3D map, then measured patterns in the distribution of galaxies that relate to sound waves that occurred in the early universe, known as baryon acoustic oscillations.

SonicSpike shares a report from Scientific American: A day after the American Astronomical Society (AAS) announced that there were no signs of unsafe eclipse glasses or other solar viewers on the market in early March, astronomer and science communicator Rick Fienberg received an alarming call. Fienberg is project manager of the AAS Solar Eclipse Task Force, which is busy preparing for the total eclipse over North America on April 8. He's the creator of a list of vetted solar filters and viewers that will protect wearers' eyes as they watch the moon move in front of the sun. When a solar eclipse last crossed a major swath of the U.S. in 2017, Fienberg and his team spotted some counterfeit glasses entering the marketplace -- imitations that distributors claimed were manufactured by vetted companies. Testing at accredited labs indicated that many counterfeits were actually safe to use, however. This led the task force to describe such eclipse glasses as "misleading" but not "dangerous" in a March 11 statement meant to reassure the public.

But then Fienberg's phone rang. The caller was "a guy who had bought thousands of eclipse glasses from a distributor who had been on our list at one point," Fienberg says. "Those glasses were not safe. They were no darker than ordinary sunglasses." Legitimate eclipse glasses are at least 1,000 times darker than the darkest sunglasses you can buy. Fienberg contacted Cangnan County Qiwei Craft, a Chinese factory that he knew manufactured safe glasses and had -- in the past -- sold them to the distributor in question. But this time, Fienberg says, factory representatives told him they hadn't sold to that distributor in a long while. "That's when we switched from being concerned about only counterfeits to being concerned about actual fakes," Fienberg says. The AAS does not have a confident estimate of how many fake or counterfeit glasses are for sale out there. And though Fienberg doesn't think this is a widespread problem, the situation is an "iceberg kind of concern," he says, because there are likely more examples than the ones he knows about. While counterfeit glasses may still be safe to use, completely fake glasses could put wearers in serious danger. [...]

While lab tests are the best way to determine whether glasses meet the ISO standard, Fienberg says there is a three-part test people can do at home if they're concerned their eclipse viewers aren't up to the task. First, put your glasses on indoors and look around. The only things you should be able to see are very bright lights, such as a halogen bulb or a smartphone flashlight. Then, if the glasses pass the indoor test, bring them outside -- but don't look at the sun just yet. Look around: it should be too dark to see distant hills, trees or even the ground. If that second test is passed, keep the glasses on and quickly glance at the sun. You should comfortably see a bright, sharp-edged round disk. If your glasses pass all three tests, they are probably safe to wear. Still, Fienberg points out that it's best to use them for only a few seconds every minute or so during the eclipse; this cautious approach is how they're intended to be used. And if you don't trust your glasses for April's celestial event, you could try to find a reliable pair in the next two decades. "You only have to wait 20 years for another really good eclipse year in the [United] States," Fienberg says.

NASA announced on Wednesday that they have selected three companies to develop preliminary designs for vehicles to take astronauts around the south polar region of the Moon. "After the astronauts return to Earth, these vehicles would be able to self-drive around as robotic explorers, similar to NASA's rovers on Mars," reports the New York Times. "The self-driving capability would also allow the vehicle to meet the next astronaut mission at a different location." From the report: The companies are Intuitive Machines of Houston, which in February successfully landed a robotic spacecraft on the moon; Lunar Outpost of Golden, Colo.; and Venturi Astrolab of Hawthorne, Calif. Only one of the three will actually build a vehicle for NASA and send it to the moon. NASA had asked for proposals of what it called the lunar terrain vehicle, or L.T.V., that could drive at speeds up to 9.3 miles per hour, travel a dozen miles on a single charge and allow astronauts to drive around for eight hours. The agency will work with the three companies for a year to further develop their designs. Then NASA will choose one of them for the demonstration phase. The L.T.V. will not be ready in time for the astronauts of Artemis III, the first landing in NASA's return-to-the-moon program, which is currently scheduled for 2026.

The plan is for the L.T.V. to be on the lunar surface ahead of Artemis V, the third astronaut landing that is expected in 2030, said Lara Kearney, manager of the extravehicular activity and human surface mobility program at the NASA Johnson Space Center. "If they can get there earlier, we'll take it earlier," Ms. Kearney said. The L.T.V. contract will be worth up to $4.6 billion over the next 15 years -- five years of development and then a decade of operations on the moon, most of it going to the winner of this competition. But Ms. Kearney said the contracts allow NASA to later finance the development of additional rovers, or allow other companies to compete in the future.

An anonymous reader quotes a report from InterestingEngineering: A Pittsburgh-based biotech company has started a one-of-a-kind trial in a patient with a failing liver. Their goal is to grow a functional second liver within the patient's body -- something never achieved before. If effective, it might be a life-saving therapy for those who require liver transplants but have to wait months for a compatible donor organ. LyGenesis is currently carrying out a trial in only one patient with end-stage liver disease (ESLD) to test the efficacy of their allogenic regenerative cell therapy. As per Nature, the experimental procedure was conducted in Houston on March 25. The report also states that the patient is "recovering well" after receiving the treatment. However, the formation of the new liver-like organ in the lymph node may take several months. Moreover, the individual will be kept on immunosuppressive drugs to prevent any initial rejection of the donor cells. The physicians will continue to monitor the patient's health closely.

In this trial, scientists prepared donated hepatocyte cells for transplantation by suspending them in a solution. These cells were then transplanted into the patient's upper abdominal lymph nodes, which are tiny bean-shaped structures. These structures are an essential immune system component and filter waste from the body. Apart from the abdomen, lymph nodes are also found in the neck and chest. The team opted for a minimally invasive approach to inject the cells into the patient's lymph node via a catheter in the neck. "The lymph nodes then act as in vivo bioreactors, helping the hepatocytes to engraft, proliferate, and generate functional ectopic liver tissue," the press release noted. In simplest terms, these cells have the ability to multiply over the next several months. In a person with a failing liver, lymph nodes might operate as a second liver-like organ.

Isaac Schultz reports via Gizmodo: Nine years and 3.2 billion pixels later, it is complete: the LSST Camera stands as the largest digital camera ever built for astronomy and will serve as the centerpiece of the Vera Rubin Observatory, poised to begin its exploration of the southern skies. The Rubin Observatory's key goal is the 10-year Legacy Survey of Space and Time (LSST), a sweeping, near-constant observation of space. This endeavor will yield 60 petabytes of data on the composition of the universe, the nature and distribution of dark matter, dark energy and the expansion of the universe, the formation of our galaxy, our intimate little solar system, and more. The camera will use its 5.1-foot-wide optical lens to take a 15-second exposure of the sky every 20 seconds, automatically changing filters to view light in every wavelength from near-ultraviolet to the near-infrared. Its constant monitoring of the skies will eventually amount to a timelapse of the heavens; it will highlight fleeting events for other scientists to train their telescopes on, and monitor changes in the southern sky.

To do this, the team needed a Rolls Royce of a digital camera. Mind you, the camera actually cost many million times that of an actual Royce Royce, and at 6,200 pounds (2,812 kilograms), it weighs a lot more than a fancy car. Each of the 21 rafts that makes up the camera's focal plane is the price of a Maserati, and are worth every penny if they collect the sort of data scientists expect them to. "I'm personally most excited to study the expansion of the Universe using gravitational lenses to better understand Dark Energy," said Aaron Roodman, a physicist at SLAC and lead on the camera program, in an email to Gizmodo. "That means two things: 1) measuring the brightness in all six of our filters of literally billions of galaxies and very carefully measuring their shape, which has been subtly altered by the bending of light by matter, and 2) discovering and studying very special objects where a distant quasar is almost perfectly lined up with a more nearby galaxy."

Speaking through a SLAC release, Rodman said the camera's images could "resolve a golf ball from around 15 miles away, while covering a swath of the sky seven times wider than the full moon." The first images from the Rubin Observatory are slated to be publicly released in March 2025, which feels like a long way away. But several important agenda items still need to happen. For one, the SLAC team has to ship the LSST camera safely to Chile from its current lodgings in northern California. (Don't worry -- they've made a test run of the journey.) Then, the observatory's mirrors need to be readied for testing and the observatory's dome has to be completed, among some other tasks. But whenever all that is complete, the legacy survey will launch into a decade's worth of scientific discovery. Rubin Observatory estimates suggest that LSST could "increase the number of known objects by a factor of 10," according to a SLAC release.

artmancc writes: The White House has directed NASA and other federal agencies to get to work on a plan to implement precision timekeeping and dissemination on the moon and elsewhere in space. Reuters cited a memo from the head of the White House Office of Science and Technology Policy (OSTP) that "instructed the space agency to work with other parts of the U.S. government to devise a plan by the end of 2026 for setting what it called a Coordinated Lunar Time (LTC). The name of the proposed time standard is similar to the terrestrial time standard known as Coordinated Universal Time (UTC).

"OSTP chief Arati Prabhakar's memo said that for a person on the moon, an Earth-based clock would appear to lose on average 58.7 microseconds per Earth-day and come with other periodic variations that would further drift moon time from Earth time," Reuters reported. An unidentified OSTP official said the lunar time standard is needed for secure and synchronized communication between astronauts, satellites orbiting the moon, and Earth.

An anonymous reader quotes an opinion piece from the Washington Post, published by the Editorial Board: A just-published investigation by Russian, American and German journalists has unearthed startling new information about the so-called Havana syndrome, or "Anomalous Health Incidents," as the government calls the unexplained bouts of painful disorientation that U.S. diplomats and intelligence officers have suffered in recent years. The new information suggests but does not prove that Russia's military intelligence agency is responsible. Earlier, agencies in the U.S. intelligence community had concluded that "it is very unlikely a foreign adversary is responsible." They need to look again. [...]

[T]he new investigation by the Insider, a Russian investigative news outlet, in collaboration with CBS's "60 Minutes" and Germany's Der Spiegel, paints a different picture. It identifies the possible culprit as Unit 29155, a "notorious assassination and sabotage squad" of the GRU, Moscow's military intelligence service. Senior members of the unit received "awards and political promotions for work related to the development of 'non-lethal acoustic weapons'" -- a term used in the Russian military-scientific literature to describe both sound- and radiofrequency-based directed energy devices. The investigation found documentary evidence that Unit 29155 "has been experimenting with exactly the kind of weaponized technology" experts suggest is a plausible cause. Moreover, the Insider reported, geolocation data shows that operators attached to Unit 29155, traveling undercover, were present in places where Havana syndrome struck, just before the incidents took place.

Even more concerning, the investigation found that a commonality among the Americans targeted was their work history on Russia issues. This included CIA officers who were helping Ukraine build up its intelligence capabilities in the years before Russia's full-scale invasion in 2022. One veteran of the CIA Kyiv station was named the new chief of station in Vietnam and was hit there. A second veteran of the CIA in Ukraine was hit in his apartment in Tashkent, Uzbekistan. Both these intelligence officers had to be medevaced and were treated at Walter Reed National Military Medical Center. The wife of a third CIA officer who had served in Kyiv was hit in London. "Of all the cases" examined by the news organizations, they said, "the most well-documented involve U.S. intelligence and diplomatic personnel with subject matter expertise in Russia or operational experience in countries such as Georgia and Ukraine," both of which were the scene of popular pro-Western uprisings in the past two decades. The news organizations point out that Russian President Vladimir Putin has often blamed these "color revolutions" on the CIA and the State Department. They conclude, "Putin would have every interest in neutralizing scores of U.S. intelligence officers he deemed responsible for his loss of the former satellites." The Editorial Board is advocating for a thorough and aggressive investigation by the U.S. intelligence community that "takes into account all aspects of the incidents."

"If the incidents are a deliberate attack, the perpetrator must be identified and held to account. Along with sending a message to those who might harm American personnel, the United States needs to show all those who might join the diplomatic and intelligence services that the government will protect them abroad and at home from foreign adversaries, no matter what."

As political pressure mounts, TikTok says it's committed to fostering educational content on its app. "The company announced on Tuesday that it's expanding its dedicated STEM feed across Europe, starting in the U.K. and Ireland, after first launching it in the U.S. last year," reports TechCrunch. From the report: The STEM feed will begin to automatically appear alongside the "For You" and "Following" feeds for users under the age of 18. Users above the age of 18 can enable the STEM feed via the app's "content preferences" settings. The feed includes English-speaking content with auto-translate subtitles. TikTok says that since launching the feed in the U.S. last year, 33% of users have the STEM feed enabled and a third of teens go to the STEM feed every week. The app has seen a 24% growth in STEM-related content in the U.S. since the feed launched. Over the past three years, almost 15 million STEM-related videos have been published on the app globally.

The company is expanding its partnerships with Common Sense Networks and Poynter to assess all of the content appearing on the STEM feed. Common Sense Networks will examine the content to ensure it's appropriate for the STEM feed, while Poynter will assess the reliability of the information. Content that doesn't pass both of these checkpoints will not be eligible for the STEM feed.

A nearly two-pound piece of trash from the International Space Station may have hit a house in Florida. Alejandro Otero said it "tore through the roof and both floors of his two-story house in Naples, Florida," reports Ars Technica. "Otero wasn't home at the time, but his son was there." From the report: A Nest home security camera captured the sound of the crash at 2:34 pm local time (19:34 UTC) on March 8. That's an important piece of information because it is a close match for the time -- 2:29 pm EST (19:29 UTC) -- that US Space Command recorded the reentry of a piece of space debris from the space station. At that time, the object was on a path over the Gulf of Mexico, heading toward southwest Florida. This space junk consisted of depleted batteries from the ISS, attached to a cargo pallet that was originally supposed to come back to Earth in a controlled manner. But a series of delays meant this cargo pallet missed its ride back to Earth, so NASA jettisoned the batteries from the space station in 2021 to head for an unguided reentry.

Otero's likely encounter with space debris was first reported by WINK News, the CBS affiliate for southwest Florida. Since then, NASA has recovered the debris from the homeowner, according to Josh Finch, an agency spokesperson. Engineers at NASA's Kennedy Space Center will analyze the object "as soon as possible to determine its origin," Finch told Ars. "More information will be available once the analysis is complete." [...] In a post on X, Otero said he is waiting for communication from "the responsible agencies" to resolve the cost of damages to his home.

If the object is owned by NASA, Otero or his insurance company could make a claim against the federal government under the Federal Tort Claims Act, according to Michelle Hanlon, executive director of the Center for Air and Space Law at the University of Mississippi. "It gets more interesting if this material is discovered to be not originally from the United States," she told Ars. "If it is a human-made space object which was launched into space by another country, which caused damage on Earth, that country would be absolutely liable to the homeowner for the damage caused." This could be an issue in this case. The batteries were owned by NASA, but they were attached to a pallet structure launched by Japan's space agency.

A Chinese scientist who was imprisoned for his role in creating the world's first genetically edited babies says he has returned to his laboratory to work on the treatment of Alzheimer's and other genetic diseases. From a report: In an interview with a Japanese newspaper, He Jiankui said he had resumed research on human embryo genome editing, despite the controversy over the ethics of artificially rewriting genes, which some critics predicted would lead to demand for "designer babies."

"We will use discarded human embryos and comply with both domestic and international rules," He told the Mainichi Shimbun, adding that he had no plans to produce more genome-edited babies. Previously, He had used a tool known as Crispr-Cas9 to rewrite DNA in embryos. In 2019 a court in China sentenced He to three years in prison for violating medical regulations after he claimed the previous year that he had created genetically modified twin sisters, Lulu and Nana, before birth. His experiments sent shockwaves through the medical and scientific world. He was widely condemned for having gone ahead with the risky, ethically contentious and medically unjustified procedure with inadequate consent from the families involved.

The court found that He had forged documents from an ethics review panel that were used to recruit couples for his research. He said he had used a gene-editing procedure known as Crispr-Cas9 to rewrite the DNA in the sisters' embryos -- modifications he claimed would make the children immune to HIV. He has continued to defend his work, despite widespread criticism, saying he was "proud" of having created Lulu and Nana. A third girl was born in 2019 as a result of similar experiments.

"Be it enacted by the Legislature of the State of Arizona..." reads the official text of House Bill #2,477. "PLUTO IS THE OFFICIAL STATE PLANET."

An anonymous reader shared this report from Capital Media Services: The governor signed legislation Friday designating Pluto as Arizona's "official state planet." It joins a list of other items the state has declared to be "official,'' ranging from turquoise as the state gemstone and copper as the state metal to the Sonorasaurus as the state dinosaur. "I am proud of Arizona's pioneering work in space discovery," governor Hobbs said.

What makes Pluto unique and ripe for claim by Arizona is that it is the only planet actually discovered in the United States, and the discovery was made in Flagstaff. Rep. Justin Wilmeth, a Phoenix Republican and self-described "history nerd,'' said that needed to be commemorated, starting with the legacy of astronomer Clyde Tombaugh. In 1930, Tombaugh was working at the Lowell Observatory in Flagstaff. "The whole story of Clyde is just amazing, just sitting there under the telescope'' looking for planets by taking photos over a period of time, said Wilmeth. "It was two different glass planes that had one little spec of light moving in a different direction,'' showing it wasn't just another star — and all by observation and not computers. "To me, that's something that's just mind boggling."
"The International Astronomical Union voted years ago to strip Pluto of its official status as a planet," the article points out, noting that its official definition specifies that planets "clear the neighboring region of other objects." (While Pluto "has such a small gravitational pull, it has not attracted and absorbed other space rocks in its orbit".)

So in 2006 Pluto was reclassified as a dwarf planet, according to a NASA web page. "Pluto is about 1/6 the width of Earth," and has a radius of 715 miles or 1,151 kilometers. "If Earth was the size of a nickel, Pluto would be about as big as a popcorn kernel."

Long-time Slashdot reader Baron_Yam called Arizona's new legislation "How to advertise you are ignorant. Scientists said something we don't like, so we'll make a law!" They can call it their "State Planet" all they want, but people who actually know about the skies will be mocking them for it. While there is nostalgia for the old classification, and the new one isn't perfect... it's certainly more meaningful when trying to divide up the objects of a planetary system for study.
Reached for a comment by Capital Media Services, Representative Wilmeth said "It might matter to some that are going to get picky or persnickety about stuff... There's several generations of Americans ... who believe that Pluto's a planet — or at least that's what we were taught. I'm never going to think differently. That's just my personal opinion." (The news site adds that "What is important, Wilmeth said, is remembering the history and promoting it.")

Five senators in Arizona's state legislatur did vote against the measure — though not all of them did so for scientific reasons, Senator Anthony Kern explained to Capital Media Services. "I did not want to discriminate against those who wanted Mars, Venus, Jupiter, or everyone's favorite, Uranus."

As a department of America's federal Health agency, the Food and Drug Administration is responsible for public health rules, including prescription medicines. And the FDA "has not changed its position that currently available clinical trial data do not demonstrate that ivermectin is effective against COVID-19," they confirmed to CNN this week. "The agency has not authorized or approved ivermectin for use in preventing or treating COVID-19."

But there was also a lawsuit. In "one of its more popular pandemic-era social media campaigns," the agency tweeted out "You are not a horse. You are not a cow. Seriously, y'all. Stop it." The post attracted nearly 106,000 likes — and over 46,000 reposts, and was followed by another post on Instagram. "Stop it with the #ivermectin. It's not authorized for treating #COVID."

Los Angeles Times business columnist Michael Hiltzik writes that the posts triggered a "groundless" lawsuit: It was those latter two lines that exercised three physicians who had been prescribing ivermectin for patients. They sued the FDA in 2022, asserting that its advisory illegally interfered with the practice of medicine — specifically with their ability to continue prescribing the drug. A federal judge in Texas threw out their case, but the 5th Circuit Court of Appeals — the source of a series of chuckleheaded antigovernment rulings in recent years — reinstated it last year, returning it to the original judge for reconsideration.

Now the FDA has settled the case by agreeing to delete the horse post and two similar posts from its accounts on the social media platforms X, LinkedIn and Facebook. The agency also agreed to retire a consumer advisory titled "Why You Should Not Use Ivermectin to Treat or Prevent COVID-19." In defending its decision, the FDA said it "has chosen to resolve this lawsuit rather than continuing to litigate over statements that are between two and nearly four years old."

That sounds reasonable enough, but it's a major blunder. It leaves on the books the 5th Circuit's adverse ruling, in which a panel of three judges found that the FDA's advisory crossed the line from informing consumers, which they said is all right, to recommending that consumers take some action, which they said is not all right... That's a misinterpretation of the law and the FDA's actions, according to Dorit Rubinstein Reiss of UC College of the Law in San Francisco. "The FDA will seek to make recommendations against the misuse of products in the future, and having that decision on the books will be used to litigate against it," she observed after the settlement.
"A survey by Boston University and the University of Michigan estimated that Medicare and private insurers had wasted $130 million on ivermectin prescriptions for COVID in 2021 alone."

"Researchers have successfully transformed CO2 into methanol," reports SciTechDaily, "by shining sunlight on single atoms of copper deposited on a light-activated material, a discovery that paves the way for creating new green fuels." Tara LeMercier, a PhD student who carried out the experimental work at the University of Nottingham, School of Chemistry, said: "We measured the current generated by light and used it as a criterion to judge the quality of the catalyst. Even without copper, the new form of carbon nitride is 44 times more active than traditional carbon nitride. However, to our surprise, the addition of only 1 mg of copper per 1 g of carbon nitride quadrupled this efficiency. Most importantly the selectivity changed from methane, another greenhouse gas, to methanol, a valuable green fuel."

Professor Andrei Khlobystov, School of Chemistry, University of Nottingham, said: "Carbon dioxide valorization holds the key for achieving the net-zero ambition of the UK. It is vitally important to ensure the sustainability of our catalyst materials for this important reaction. A big advantage of the new catalyst is that it consists of sustainable elements — carbon, nitrogen, and copper — all highly abundant on our planet." This invention represents a significant step towards a deep understanding of photocatalytic materials in CO2 conversion. It opens a pathway for creating highly selective and tuneable catalysts where the desired product could be dialed up by controlling the catalyst at the nanoscale.
"The research has been published in the Sustainable Energy & Fuels journal of the Royal Society of Chemistry."

Thanks to long-time Slashdot reader Baron_Yam for sharing the article.

Longtime Slashdot reader necro81 writes: The New York Times has an occasional series called "Overlooked," whereby notable people whose deaths were overlooked at the time receive the obituary they deserve. Their latest installment eulogizes Henrietta Swan Leavitt, who passed away in 1921 at age 53. From the report: "In the early 20th century, when Henrietta Leavitt began studying photographs of distant stars at the Harvard College Observatory, astronomers had no idea how big the universe was... Leavitt, working as a poorly paid member of a team of mostly women [computers] who cataloged data for the scientists at the observatory, found a way to peer out into the great unknown and measure it."

Leavitt discovered the period-luminosity relationship for Cepheid variable stars. The relationship, now known as Leavitt's Law, is a crucial rung in the cosmic distance ladder, the methods for measuring the distance to stars, galaxies, and across the visible universe. From the report: "[Leavitt's Law] underpinned the research of other pioneering astronomers, including Edwin Hubble and Harlow Shapley, whose work in the years after World War I demolished long-held ideas about our solar system's place in the cosmos. Leavitt's Law has been used on the Hubble Telescope and the James Webb Space Telescope in making new calculations about the rate of expansion of the universe and the proximity of stars billions of light years from earth. 'She cracked into something that was not only impressive scientifically but shifted an entire paradigm of thinking...'"

When a long-term memory forms, some brain cells experience a rush of electrical activity so strong that it snaps their DNA. Then, an inflammatory response kicks in, repairing this damage and helping to cement the memory, a study in mice shows. Nature: The findings, published on 27 March in Nature, are "extremely exciting," says Li-Huei Tsai, a neurobiologist at the Massachusetts Institute of Technology in Cambridge who was not involved in the work. They contribute to the picture that forming memories is a "risky business," she says. Normally, breaks in both strands of the double helix DNA molecule are associated with diseases including cancer. But in this case, the DNA damage-and-repair cycle offers one explanation for how memories might form and last.

It also suggests a tantalizing possibility: this cycle might be faulty in people with neurodegenerative diseases such as Alzheimer's, causing a build-up of errors in a neuron's DNA, says study co-author Jelena Radulovic, a neuroscientist at the Albert Einstein College of Medicine in New York City. [...] To better understand the part these DNA breaks play in memory formation, Radulovic and her colleagues trained mice to associate a small electrical shock with a new environment, so that when the animals were once again put into that environment, they would 'remember' the experience and show signs of fear, such as freezing in place. Then the researchers examined gene activity in neurons in a brain area key to memory -- the hippocampus. They found that some genes responsible for inflammation were active in a set of neurons four days after training. Three weeks after training, the same genes were much less active.