"The universe is expanding faster than predicted by theoretical models," writes Phys.org, "and faster than can be explained by our current understanding of physics." There's now been new confirmation of this (published in The Astrophysical Journal Letters) by a team led by Dan Scolnic, an associate professor of physics at Duke University.

And this means the so-called Hubble tension "now turns into a crisis," said Dan Scolnic, who led the research team... This is saying, to some respect, that our model of cosmology might be broken." Measuring the universe requires a cosmic ladder, which is a succession of methods used to measure the distances to celestial objects, with each method, or "rung," relying on the previous for calibration. The ladder used by Scolnic was created by a separate team using data from the Dark Energy Spectroscopic Instrument (DESI), which is observing more than 100,000 galaxies every night from its vantage point at the Kitt Peak National Observatory. Scolnic recognized that this ladder could be anchored closer to Earth with a more precise distance to the Coma Cluster, one of the galaxy clusters nearest to us. "The DESI collaboration did the really hard part, their ladder was missing the first rung," said Scolnic. "I knew how to get it, and I knew that that would give us one of the most precise measurements of the Hubble constant we could get, so when their paper came out, I dropped absolutely everything and worked on this non-stop."

To get a precise distance to the Coma cluster, Scolnic and his collaborators used the light curves from 12 Type Ia supernovae within the cluster. Just like candles lighting a dark path, Type Ia supernovae have a predictable luminosity that correlates to their distance, making them reliable objects for distance calculations. The team arrived at a distance of about 320 million light-years, nearly in the center of the range of distances reported across 40 years of previous studies — a reassuring sign of its accuracy. "This measurement isn't biased by how we think the Hubble tension story will end," said Scolnic. "This cluster is in our backyard, it has been measured long before anyone knew how important it was going to be."
The results? "It matches the universe's expansion rate as other teams have recently measured it," writes Phys.org, "but not as our current understanding of physics predicts it. The longstanding question is: is the flaw in the measurements or in the models? Scolnic's team's new results add tremendous support to the emerging picture that the root of the Hubble tension lies in the models..."

And the article closes with this quote from Scolnic: "Ultimately, even though we're swapping out so many of the pieces, we all still get a very similar number. So, for me, this is as good of a confirmation as it's ever gotten. We're at a point where we're pressing really hard against the models we've been using for two and a half decades, and we're seeing that things aren't matching up," said Scolnic.

"This may be reshaping how we think about the universe, and it's exciting! There are still surprises left in cosmology, and who knows what discoveries will come next?"

Jersey is an island in the English channel, "a self-governing British Crown Dependency near the coast of northwest France," according to Wikipedia — population: 103,267.

But now some residents of Jersey "have been recommended bloodletting to reduce high concentrations of 'forever chemicals' in their blood," reports the Guardian, "after tests showed some islanders have levels that can lead to health problems." Private drinking water supplies in Jersey were polluted by the use of firefighting foams containing PFAS (per- and polyfluoroalkyl substances) at the island's airport, which were manufactured by the U.S. multinational 3M. .. Bloodletting draws blood from a vein in measured amounts. It is safe and the body replenishes the blood naturally, but it must be repeated until clean...

In response to the blood results, the government established an independent PFAS scientific advisory panel to advise public policy. The panel's first report recommended that the government should look at offering bloodletting to affected residents. "Studies show that bloodletting is an effective way to lower levels of PFAS in blood," said Ian Cousins, one of the panel members, though he added that there were no guarantees the process would prevent or cure diseases associated with the chemicals. The therapy costs about £100,000 upfront and then as much as £200,000 a year to treat 50 people. The panel is also considering the benefit of the drug cholestyramine, which a study has shown reduces PFAS in blood more quickly and cheaply, albeit with possible side effects. The government says it plans to launch a clinical service by early 2025.

Contamination persisted on the island for decades. "We know they started to use 3M's firefighting foam in the 1960s and then ramped up in the 1990s in weekly fire training exercises, after which foam started to appear in nearby streams," said Jeremy Snowdon, a former Jersey airport engineer who drank contaminated water for years. He has measured elevated levels of PFAS in his own blood and has high cholesterol.
The article includes this quote from one of the 88 residents of the polluted area found to have high levels of PFAS after blood testing. "I just want this out of my body. I don't want to end up with bladder cancer."

America's Federal Trade Commission has been "raising antitrust concerns" about them for years, reports NBC News.

The latest? America's three largest drug middlemen "inflated the costs of numerous life-saving medications by billions of dollars over the past few years, the FTC said in a report Tuesday." The top pharmacy benefit managers (PBMs) — CVS Health's Caremark Rx, Cigna's Express Scripts and UnitedHealth Group's OptumRx — generated roughly $7.3 billion through price hikes over about five years starting in 2017, the FTC said. The "excess" price hikes affected generic drugs used to treat heart disease, HIV and cancer, among other conditions, with some increases more than 1,000% of the national average costs of acquiring the medications, the commission said. The FTC also said these so-called Big Three health care companies — which it estimates administer 80% of all prescriptions in the U.S. — are inflating drug prices "at an alarming rate, which means there is an urgent need for policymakers to address it...."

Some of the steepest drug markups were "hundreds and thousands of percent," according to Tuesday's report, which highlights just how profitable specialty drugs have become for the three leading PBMs. Cancer drugs alone made up nearly half of the $7.3 billion, the commission wrote, with multiple sclerosis medications accounting for another 25%. Dispensing highly marked-up specialty drugs was a massive income stream for the companies in 2021, the FTC found. Out of tens of thousands of drugs dispensed, the top 10 specialty generics alone made up nearly 11% of the companies' pharmacy-related operating income that year, the agency estimated. Across the 51 drugs the agency analyzed, the Big Three's price-markup revenue surged from $522 million in 2017 to $2.1 billion in 2021, the report said.
"The FTC found that 22 percent of specialty drugs dispensed by PBM-affiliated pharmacies were marked up by more than 1,000 percent," reports The Hill, "while 41 percent were marked up between 100 and 1,000 percent. Among those drugs marked up by more than 1,000 percent, half of them were marked up by more than 2,000 percent."

And the nonprofit site progressive news site Common Dreams shares some examples from the FTC's 60-page report: "For the pulmonary hypertension drug tadalafil (generic Adcirca), for example, pharmacies purchased the drug at an average of $27 in 2022, yet the Big Three PBMs marked up the drug by $2,079 and paid their affiliated pharmacies $2,106, on average, for a 30-day supply of the medication on commercial claims," the publication notes. That's a staggering average markup of 7,736%... The new analysis follows a July 2024 report that revealed Big Three PBM-affiliated pharmacies received 68% of the dispensing revenue generated by specialty drugs in 2023, a 14% increase from 2016...

Responding to the FTC report, Emma Freer, senior policy analyst for healthcare at the American Economic Liberties Project — a corporate accountability and antitrust advocacy group — said in a statement Tuesday that "the FTC's second interim report lays bare the blatant profiteering by PBM giants, which are marking up lifesaving drugs like cancer, HIV, and multiple sclerosis treatments by thousands of percent and forcing patients to pay the price."

"The next great space telescope will study distant galaxies and faraway planets from an orbital outpost about a million miles from Earth," writes the Washington Post. "But first it has to be put together, piece by piece, in a cavernous chamber at the NASA Goddard Space Flight Center in Greenbelt, Maryland."

One long-time NASA worker calls it "the largest clean room in the free world," and the Post notes everyone wears white gowns and surgical masks "to keep hardware from being contaminated by humans. No dust allowed. No stray hairs. One wall is entirely covered by HEPA filters." The place is known as the Clean Room, or sometimes the High Bay. It is 125 feet long, 100 feet wide, 90 feet high, with almost as much volume as the Capitol Rotunda. NASA boasts that in the Clean Room you could put nearly 30 tractor-trailers side by side on the floor and stack them 10 high... About two dozen workers clustered around towering pieces of hardware, some twice or three times the height of a typical person. When stacked and integrated, these components will form the Nancy Grace Roman Space Telescope.

The assembly of the telescope ramped up this fall, with 600 workers aiming to get everything integrated and tested by late 2026. NASA has committed to launching the telescope no later than May 2027. The telescope will be roughly the size of the Hubble Space Telescope, but not quite as long (a "stubby Hubble," some call it). What the astronomy community and the general public will receive in exchange for the considerable taxpayer investment of nearly $4 billion is an instrument that can do what other telescopes can't.

It will have a sprawling field of view, about 100 times that of the Hubble or Webb space telescopes. And it will be able to pivot quickly across the night sky to new targets and download tremendous amounts of data that will be instantly available to the researchers. A primary goal of the Roman is to understand "dark energy," the mysterious driver of the accelerating expansion of space. But it will also attempt to study the atmospheres of exoplanets — worlds orbiting distant stars...

The main element, informally referred to as "the telescope" but officially called the "optical telescope assembly," showed up this fall. It was originally built as a spy satellite for the National Reconnaissance Office. That's right: It was built to look down at Earth, rather than at the rest of the universe. The NRO decided more than a decade ago that it didn't need it, and gave it, along with another, identical spy satellite, to NASA. Roman's wide-angle view of deep space, its maneuverability and ability to download massive amounts of data makes it optimized as a dark energy telescope. And it will also study the effects of dark matter, which comprises about 25 percent of the universe but remains a ghostly presence.

Smithsonian Magazine reports: A homeowner on Prince Edward Island in Canada has had a very unusual near-death experience: A meteorite landed exactly where he'd been standing roughly two minutes earlier. What's more, his home security camera caught the impact on video -- capturing a rare clip that might be the first known recording of both the visual and audio of a meteorite striking the planet. The shocking event took place in July 2024 and was announced in a statement by the University of Alberta on Monday.

"It sounded like a loud, crashing, gunshot bang," the homeowner, Joe Velaidum, tells the Canadian Press' Lyndsay Armstrong. Velaidum wasn't home to hear the sound in person, however. Last summer, he and his partner Laura Kelly noticed strange, star-shaped, grey debris in front of their house after returning from a walk with their dogs. They checked their security camera footage, and that's when they saw and heard it: a small rock plummeting through the sky and smashing into their walkway. It landed so quickly that the space rock itself is only visible in two of the video's frames.

OpenAI has developed a language model designed for engineering proteins, capable of converting regular cells into stem cells. It marks the company's first venture into biological data and demonstrates AI's potential for unexpected scientific discoveries. An anonymous reader quotes a report from MIT Technology Review: Last week, OpenAI CEO Sam Altman said he was "confident" his company knows how to build an AGI, adding that "superintelligent tools could massively accelerate scientific discovery and innovation well beyond what we are capable of doing on our own." The protein engineering project started a year ago when Retro Biosciences, a longevity research company based in San Francisco, approached OpenAI about working together. That link-up did not happen by chance. Sam Altman, the CEO of OpenAI, personally funded Retro with $180 million, as MIT Technology Review first reported in 2023. Retro has the goal of extending the normal human lifespan by 10 years. For that, it studies what are called Yamanaka factors. Those are a set of proteins that, when added to a human skin cell, will cause it to morph into a young-seeming stem cell, a type that can produce any other tissue in the body. [...]

OpenAI's new model, called GPT-4b micro, was trained to suggest ways to re-engineer the protein factors to increase their function. According to OpenAI, researchers used the model's suggestions to change two of the Yamanaka factors to be more than 50 times as effective -- at least according to some preliminary measures. [...] The model does not work the same way as Google's AlphaFold, which predicts what shape proteins will take. Since the Yamanaka factors are unusually floppy and unstructured proteins, OpenAI said, they called for a different approach, which its large language models were suited to. The model was trained on examples of protein sequences from many species, as well as information on which proteins tend to interact with one another. While that's a lot of data, it's just a fraction of what OpenAI's flagship chatbots were trained on, making GPT-4b an example of a "small language model" that works with a focused data set.

Once Retro scientists were given the model, they tried to steer it to suggest possible redesigns of the Yamanaka proteins. The prompting tactic used is similar to the "few-shot" method, in which a user queries a chatbot by providing a series of examples with answers, followed by an example for the bot to respond to. Although genetic engineers have ways to direct evolution of molecules in the lab, they can usually test only so many possibilities. And even a protein of typical length can be changed in nearly infinite ways (since they're built from hundreds of amino acids, and each acid comes in 20 possible varieties). OpenAI's model, however, often spits out suggestions in which a third of the amino acids in the proteins were changed. "We threw this model into the lab immediately and we got real-world results," says Retro's CEO, Joe Betts-Lacroix. He says the model's ideas were unusually good, leading to improvements over the original Yamanaka factors in a substantial fraction of cases.

Scientists warn that the devastating fires that killed at least 24 people and destroyed more than 12,000 structures in Los Angeles represent a new type of urban firestorm, distinct from traditional wilderness blazes. In densely populated areas, buildings themselves become fuel, creating a chain reaction of destruction, researchers reported Friday in Nature.

The fires were intensified by steep terrain, powerful winds and a climate pattern of extreme wet-to-dry conditions that created abundant fuel. Researchers say such urban fires are likely to become more frequent as populations expand into wildland areas and climate change accelerates.

SpaceX conducted its seventh test flight of the Starship rocket on Thursday with mixed results. The upper stage was lost nine minutes after launch, but the Super Heavy booster successfully landed back at the launch site, marking a second successful recovery. CNBC reports: SpaceX said in a post on X that the ship broke up during its ascent burn and that it would "continue to review data from today's flight test to better understand root cause." After the rocket lost communication, social media users posted photos and videos of what appeared to be fireballs in the sky near the Caribbean islands. Starship's launch trajectory takes it due east from Texas, which means the fireballs are likely debris from the rocket breaking apart and reentering the atmosphere.

Starship launched from SpaceX's private "Starbase" facility near Brownsville, Texas, shortly after 5:30 p.m. ET. A few minutes later, the rocket's "Super Heavy" booster returned to land at the launch site, in SpaceX's second successful "catch" during a flight. It did not catch the booster on the last flight. There were no people on board the Starship flight. However, Elon Musk's company was flying 10 "Starlink simulators" in the rocket's payload bay and planned to attempt to deploy the satellite-like objects once in space. This would have been a key test of the rocket's capabilities, as SpaceX needs Starship to deploy its much larger and heavier upcoming generation of Starlink satellites. You can watch a recording of the launch here.

Longtime Slashdot reader timeOday shares a report from the New York Times: At 2:03 a.m. Eastern time, seven powerful engines ignited at the base of a 320-foot-tall rocket named New Glenn. The flames illuminated night into day at Cape Canaveral Space Force Station in Florida. The rocket, barely moving at first, nudged upward and then accelerated in an arc over the Atlantic Ocean, lit up in blue, the color of combustion of the rocket's methane fuel. Thirteen minutes later, the second stage of New Glenn reached orbit.

The launch was a major success for Blue Origin, Mr. Bezos' rocket company. The upward flight appeared almost flawless, but Blue Origin's stretch goal of landing the booster stage on a barge in the Atlantic Ocean failed. As planned, the booster fired three of its engines to slow down, but then the stream of data stopped, indicating that the booster had been lost.

"We'll learn a lot from today and try again at our next launch this spring," Dave Limp, the chief executive of Blue Origin, said in a statement. In an interview on Sunday, Mr. Limp said that, with a successful inaugural launch of New Glenn, Blue Origin is aiming for a second launch in the spring and that he wanted six to eight launches this year. A recording of the launch is available on YouTube.

An anonymous reader quotes a report from VentureBeat: Colossal BioSciences has raised $200 million in a new round of funding to bring back extinct species like the woolly mammoth. Dallas- and Boston-based Colossal is making strides in the scientific breakthroughs toward "de-extinction," or bringing back extinct species like the woolly mammoth, thylacine and the dodo. [...] Since launching in September 2021, Colossal has raised $435 million in total funding. This latest round of capital places the company at a $10.2 billion valuation. Colossal will leverage this latest infusion of capital to continue to advance its genetic engineering technologies while pioneering new revolutionary software, wetware and hardware solutions, which have applications beyond de-extinction including species preservation and human healthcare.

"Our recent successes in creating the technologies necessary for our end-to-end de-extinction toolkit have been met with enthusiasm by the investor community. TWG Global and our other partners have been bullish in their desire to help us scale as quickly and efficiently as possible," said CEO Colossal Ben Lamm, in a statement. "This funding will grow our team, support new technology development, expand our de-extinction species list, while continuing to allow us to carry forth our mission to make extinction a thing of the past." Here's a summary of the startup's progress on its efforts to bring back the woolly mammoth, thylacine and the dodo:

Woolly Mammoth De-extinction Progress
- Generated chromosome-scale reference genomes for elephants and the first de novo assembled mammoth genome
- Acquired and aligned 60+ ancient mammoth genomes and 30+ genomes of extant elephant species, improving mammoth-specific variant accuracy
- Derived pluripotent stem cells for Asian elephants, advancing reproductive technologies essential for de-extinction

Thylacine De-extinction Progress
- Created a 99.9% complete ancient genome for the thylacine using long-read and RNA sequencing
- Assembled telomere-to-telomere genomes of dasyurid species to understand evolutionary relationships and support conservation of marsupials
- Progress in genomics and reproductive technologies positions Colossal ahead of schedule on critical de-extinction steps

Dodo De-extinction Progress
- Completed high-coverage genomes for the dodo, its relatives, and the critically endangered manumea
- Developed tools for avian genome engineering, including techniques for craniofacial gene-editing and primordial germ cell cultivation
- Significant advances in avian-specific genetic techniques are driving progress toward dodo restoration and bird conservation

An anonymous reader shares a report: Academia is in a credibility crisis. A record-breaking 10,000 scientific papers were retracted in 2023 because of scientific misconduct, and academic journals are overwhelmed by AI-generated images, data, and texts. To understand the roots of this problem, we must look at the role of metrics in evaluating the academic performance of individuals and institutions.

To gauge research quality, we count papers, citations, and calculate impact factors. The higher the scores, the better. Academic performance is often expressed in numbers. Why? Quantification reduces complexity, makes academia manageable, allows easy comparisons among scholars and institutions, and provides administrators with a feeling of grip on reality. Besides, numbers seem objective and fair, which is why we use them to allocate status, tenure, attention, and funding to those who score well on these indicators.

The result of this? Quantity is often valued over quality. In The Quantified Society I coin the term "indicatorism": a blind focus on enhancing indicators in spreadsheets, while losing sight of what really matters. It seems we're sometimes busier with "scoring" and "producing" than with "understanding." As a result, some started gaming the system. The rector of one of the world's oldest universities, for one, set up citation cartels to boost his citation scores, while others reportedly buy(!) bogus citations. Even top-ranked institutions seem to play the indicator game by submitting false data to improve their position on university rankings!

Nearly three-quarters of all known bacterial species have never been studied in scientific literature, while just 10 species account for half of all published research, according to a new analysis published on bioRxiv.

The study of over 43,000 bacterial species found that E. coli dominates with 21% of all publications, followed by human pathogens like Staphylococcus aureus. Microbes crucial for human health and Earth's ecosystems remain largely unexplored, University of Michigan biologist Paul Jensen reported.

A new $1-million project by non-profit Align to Innovate aims to help close this gap by studying 1,000 microbes under varying conditions.

By 2060, around one million Americans may develop dementia annually, with the lifetime risk after age 55 estimated at 42% and rising sharply with age. The findings have been published in the journal Nature Medicine. Scientific American reports: The latest forecast suggests a massive and harrowing increase from annual cases predicted for 2020, in which approximately 514,000 adults in the U.S. were estimated to be diagnosed with dementia -- an umbrella term that describes several neurological conditions that affect memory and cognition.

The new study also showed the lifetime risk of dementia increased progressively with older age. They estimated that after age 55, the lifetime risk of dementia is 42 percent, and continues to rise sharply to 56 percent after age 85. Groups that showed greater lifetime risks (between 44 and 59 percent after age 55) were Black adults, women and people who carried the allele APOE e4: this variation of the gene APOE, which codes for the protein apolipoprotein E, increases the risk of developing Alzheimer's disease. Alzheimer's is the most common cause of dementia, but the study focused on all forms.

"Neuralink Corp.'s brain-computer device has been implanted in a third patient," reports Bloomberg, "and the company has plans for about 20 to 30 more implants in 2025, founder Elon Musk said."

In an interview streamed on X.com, Musk says "We've got now three humans with Neuralinks implanted and they're all working well," according to The Times of India: "We upgraded the devices, they'll have more electrodes, basically higher bandwidth, longer battery life and everything. So, expect 20 or 30 patients this year with the upgraded Neuralink devices...."

"[O]ur next part will be Blindsight devices where even if somebody has lost both eyes or has lost the optic nerve, we can interface directly with the visual cortex in the brain and enable them to see. We already have that working in monkeys," Musk added.

"We're standing down on today's launch attempt," Blue Origin posted late last night, "to troubleshoot a vehicle subsystem issue that will take us beyond our launch window. We're reviewing opportunities for our next launch attempt."

But soon Blue Origin will again attempt its very first orbital flight. And they'll also attempt to land their reusable Stage 1 on a drone in the Atlantic ocean...

Several hours Sunday night their rocket was fueled on its launch pad at Cape Canaveral, Florida, awaiting ignition. Its three-hour launch window had just opened. And Blue Origin was webcasting it all live on their web page...

But whatever happened, Ars Technica's senior space editor Eric Berger got to talk to an "affable and anxious" Jeff Bezos: "It's pretty exciting, isn't it?" Jeff Bezos, the founder of Amazon and Blue Origin, said by way of greeting... I asked what his expectations were for the launch of New Glenn, which has a three-hour window that opens at 1 am ET (06:00 UTC) on Monday, January 13... "We would certainly like to achieve orbit, and get the Blue Ring Pathfinder into orbit," Bezos said. "Landing the booster would be gravy on top of that. It's kind of insane to try and land the booster. A more sane approach would probably be to try to land it into ocean. But we're gonna go for it."

Blue Origin has built a considerable amount of infrastructure on a drone ship, Jacklyn, that will be waiting offshore for the rocket to land upon. Was Bezos not concerned about putting that hardware at risk? "I'm worried about everything," he admitted. However, the rocket has been programmed to divert from the ship if the avionics on board the vehicle sense that anything is off-nominal. And there is, of course, a pretty good chance of that happening. "We've done a lot of work, we've done a lot of testing, but there are some things that can only be tested in flight," Bezos said. "And you can't be overconfident in these things... The reality is, there are a lot of things that go wrong, and you have to accept that, if something goes wrong, we'll pick ourselves up and get busy for the second flight."
Bezos also pointed out that 7% of all the people who have ever flown into space have done so on a Blue Origin vehicle — including himself, an experience he told Ars Technica "is kind of hard to beat... That really was very meaningful for a whole bunch of reasons.

"But this is, you know, the culmination of a lot of hard work by a lot of people. And it's a really big deal. You know, you don't get very many first flights, yeah, and here we go."

The rocket's payload nose cone (or fairing) has the signatures of thousands of Blue Origin employees, according to a Blue Origin post on Instagram, calling it "a tribute to the hard work and passion for mission we all have here..." More details about the launch:

• Space.com notes that the launch "was initially scheduled for Jan. 10 and then Jan. 12, but Blue Origin postponed it due to rough offshore weather that could affect a rocket landing on the company's recovery ship in the Atlantic." Space Force officials forecast the chance of good liftoff conditions Sunday night were 50%.

• "We want to be clear about our objectives," Blue Origin posted Sunday on X.com. "This is our first flight and we've prepared rigorously for it. But no amount of ground testing or mission simulations is a replacement for flying this rocket. Our key objective today is to reach orbit safely. Anything beyond that is icing on the cake. We know landing the booster on our first try offshore in the Atlantic is ambitious — but we're going for it. No matter what happens, we'll learn, refine, and apply that knowledge to our next launch."

• While Blue Origin's "New Shephard" capsule can hold up to six passengers, the New Glenn's capsule has 30 times that capacity.

• Space.com notes the rocket is carrying a payload: a test version of the company's new 'Blue Ring' spacecraft platform to validate its orbit-to-ground communications capabilities.

• To get the next generation excited about space travel, Blue Origin's web site is selling an 11.5-inch , 636-piece model of the New Glenn rocket (complete with a retractable launch tower).

The University of Colorado Boulder's magazine recently wrote: What happened during the "Snowball Earth" period is perplexing: Just as the planet endured about 100 million years of deep freeze, with a thick layer of ice covering most of Earth and with low levels of atmospheric oxygen, forms of multicellular life emerged. Why? The prevailing scientific view is that such frigid temperatures would slow rather than speed evolution. But fossil records from 720 to 635 million years ago show an evolutionary spurt preceding the development of animals...

Carl Simpson, a macroevolutionary paleobiologist at CU Boulder, has found evidence that cold seawater could have jump-started — rather than suppressed — evolution from single-celled to multicellular life forms.
That evidence is described in Quanta magazine: Simpson proposes an answer linked to a fundamental physical fact: As seawater gets colder, it gets more viscous, and therefore more difficult for very small organisms to navigate. Imagine swimming through honey rather than water... To test the idea, Simpson, a paleobiologist at the University of Colorado, Boulder, and his team conducted an experiment designed to see what a modern single-celled organism does when confronted with higher viscosity... In an enormous, custom-made petri dish, [grad student Andrea] Halling and Simpson created a bull's-eye target of agar gel — their own experimental gauntlet of viscosity. At the center, it was the standard viscosity used for growing these algae in the lab. [Green algae, which swims with a tail-like flagellum.] Moving outward, each concentric ring had higher and higher viscosity, finally reaching a medium with four times the standard level. The scientists placed the algae in the middle, turned on a camera, and left them alone for 30 days — enough time for about 70 generations of algae to live, swim around for nutrients and die...

After 30 days, the algae in the middle were still unicellular. As the scientists put algae from thicker and thicker rings under the microscope, however, they found larger clumps of cells. The very largest were wads of hundreds. But what interested Simpson the most were mobile clusters of four to 16 cells, arranged so that their flagella were all on the outside. These clusters moved around by coordinating the movement of their flagella, the ones at the back of the cluster holding still, the ones at the front wriggling.
"One thing that you learn about small organisms from a physics point of view is that they don't experience the world the same way that we do, as larger-bodied organisms," Simpson says in the university's article. It says that instead unicellular organisms are specifically "affected by the viscosity, or thickness, of sea water," and Simpson adds that "basically, that would trigger the origin of animals, potentially."

Last year Simpson posted a preprint on biorxiv.org. (And he also co-authored an article on "physical constraints during Snowball Earth drive the evolution of multicellularity.")

There's a video showing algae in Simpson's lab clumping together in viscous water. "This observed behavior adds evidence to Simpson's hypothesis that single-celled organisms clumped together to their mutual advantage during the 'Snowball Earth' period," says the video's description, "thus adding momentum to the rise of multicellular organisms." But Simpson says in the university's article, "To actually see it empirically means there's something to this idea."

Simpson and colleagues have now received a $1 million grant to study grains of sand made from calcium carbonate and called ooids, since their diameter "could be a proxy measurement of Earth's temperature for the last 2.5 billion years," according to the university's article. Geologist Lizzy Trower says the research "can tell us something about the chemistry and water temperature in which they formed." And more importantly, "Does the fossil record agree with the predictions we would make based on this theory from this new record of temperature?" Trower and Simpson's work also has potential implications for the human quest to find life elsewhere in the universe, Trower said. If extremely harsh and cold environments can spur evolutionary change, "then that is a really different type of thing to look for in exoplanets (potentially life-sustaining planets in other solar systems), or think about when and where (life) would exist."

"This year, superconductivity — the flow of electric current with zero resistance — was discovered in three distinct materials," reports Quanta magazine. "Two instances stretch the textbook understanding of the phenomenon. The third shreds it completely...."

After four years of reserch a team at Columbia assembled a "two-sheet device, cooled it down, and watched it superconduct..." A lab at Cornell found "a species of superconductivity that no one had seen coming." And then "Over the summer, a graphene device produced a mythical form of superconductivity: The discoveries stem from a recent revolution in materials science: All three new instances of superconductivity arise in devices assembled from flat sheets of atoms. These materials display unprecedented flexibility; at the touch of a button, physicists can switch them between conducting, insulating, and more exotic behaviors — a modern form of alchemy that has supercharged the hunt for superconductivity. It now seems increasingly likely that diverse causes can give rise to the phenomenon. Just as birds, bees and dragonflies all fly using different wing structures, materials seem to pair electrons together in different ways. Even as researchers debate exactly what's happening in the various two-dimensional materials in question, they anticipate that the growing zoo of superconductors will help them achieve a more universal view of the alluring phenomenon...

[C]ustomizable 2D devices had freed them from the drudgery of designing, growing, and testing new crystals one by one. Researchers would now be able to quickly re-create the effects of many different atomic lattices in a single device and find out exactly what electrons are capable of. The research strategy is now paying off. This year, physicists found the first instances of superconductivity in 2D materials other than graphene, along with a completely novel form of superconductivity in a new graphene system. The discoveries have established that the earlier graphene superconductors mark just the outskirts of a wild new jungle...

The experimentalists are amassing a treasure trove of data for theorists to explain. [Cornell's superconductivity-discovering researchers] Mak and Shan hope that this abundance will let theorists predict ways to create superconductivity that experiments can confirm. That would demonstrate a true understanding of the phenomenon, which would mark both an academic achievement and a key step toward designing materials for revolutionary new technologies.
The article points out that already, superconductivity has "enabled the development of MRI machines and powerful particle colliders.

"If physicists could fully understand how and when the phenomenon arises, perhaps they could engineer a wire that superconducts electricity under everyday conditions rather than exclusively at low temperatures, as is currently the case. World-altering technologies — lossless power grids, magnetically levitating vehicles — might follow."

Wikipedia's massive dataset helped researchers identify three styles of curiosity -- "busybody," "hunter," and "dancer" -- based on how users navigate its pages (see: wiki rabbit hole). These curiosity styles reflect broader social trends and highlight curiosity's role in connecting information rather than merely acquiring it. Scientific American reports: In this lexicon, a busybody traces a zigzagging route through many often distantly related topics. A hunter, in contrast, searches with sustained focus, moving among a relatively small number of closely related articles. A dancer links together highly disparate topics to try to synthesize new ideas. "Curiosity actually works by connecting pieces of information, not just acquiring them," says University of Pennsylvania network scientist Dani Bassett, cosenior author on a recent study of these curiosity types in Science Advances. "It's not as if we go through the world and pick up a piece of information and put it in our pockets like a stone. Instead we gather information and connect it to stuff that we already know."

The team tracked more than 482,000 people using Wikipedia's mobile app in 50 countries or territories and 14 languages. The researchers charted these users' paths using "knowledge networks" of connected information, which depict how closely one search topic (a node in the network) is related to another. Beyond just mapping the connections, they linked curiosity styles to location-based indicators of well-being, inequality, and other measures. In countries with higher education levels and greater gender equality, people browsed more like busybodies. In countries with lower scores on these variables, people browsed like hunters. Bassett hypothesizes that "in countries that have more structures of oppression or patriarchal forces, there may be a constraining of knowledge production that pushes people more toward this hyperfocus." The researchers also analyzed topics of interest, ranging from physics to visual arts, for busybodies compared with hunters (graphic). Dancer patterns, more recently confirmed, were excluded. Editor note: This article was published on December 24, 2024, based on a study published in October, 2024.

SysEngineer shares a report from the Associated Press: A spacecraft has beamed back some of the best close-up photos yet of Mercury's north pole. The European and Japanese robotic explorer swooped as close as 183 miles (295 kilometers) above Mercury's night side before passing directly over the planet's north pole. The European Space Agency released the stunning snapshots Thursday, showing the permanently shadowed craters at the top of of our solar system's smallest, innermost planet. Cameras also captured views of neighboring volcanic plains and Mercury's largest impact crater, which spans more than 930 miles (1,500 kilometers).

Early life exposure to toxic PFAS "forever chemicals" could impact economic success in adulthood, new first-of-its-kind research [PDF] suggests. From a report: The Iowa State University and US Census Bureau working paper compared the earnings, college graduation rates, and birth weights of two groups of children -- those raised around military installations that had firefighting training areas, and those who lived near bases with no fire training site.

The military began using PFAS-laden firefighting foam in the early 1970s, which frequently contaminated the drinking water supplies in and around bases. Those who lived in regions with firefighting training areas earned about 1.7% on average less later in life, and showed a graduation rate about 1% lower. Those born between 1981-1988 earned about $1bn less in today's earnings, or about $1,000 a person on average, compared to those who did not live near the firefighting training sites.

The data also shows lower birth weights among the population -- a factor linked to lower economic success later in life. The findings "highlight the importance of careful scrutiny of novel chemicals," said Irene Jacz, a study co-author and Iowa State economist. "We think that there's a causal effect from PFAS here but it's really hard to say, 'Oh it's all brain chemistry, or health effects' so there's a need for more research" Jacz said. The paper is not yet peer-reviewed, but will soon go through the process.