Science – Page 3

Evolution journal editors resign en masse

AI, AI in science, Elsevier, Journal of Human Evolution, retraction watch, Science, science journals / Tim Belzer / December 30, 2024

an emerging form of protest?

Board members expressed concerns over high fees, editorial independence, and use of AI in editorial processes.

Over the holiday weekend, all but one member of the editorial board of Elsevier’s Journal of Human Evolution (JHE) resigned “with heartfelt sadness and great regret,” according to Retraction Watch, which helpfully provided an online PDF of the editors’ full statement. It’s the 20th mass resignation from a science journal since 2023 over various points of contention, per Retraction Watch, many in response to controversial changes in the business models used by the scientific publishing industry.

“This has been an exceptionally painful decision for each of us,” the board members wrote in their statement. “The editors who have stewarded the journal over the past 38 years have invested immense time and energy in making JHE the leading journal in paleoanthropological research and have remained loyal and committed to the journal and our authors long after their terms ended. The [associate editors] have been equally loyal and committed. We all care deeply about the journal, our discipline, and our academic community; however, we find we can no longer work with Elsevier in good conscience.”

The editorial board cited several changes made over the last ten years that it believes are counter to the journal’s longstanding editorial principles. These included eliminating support for a copy editor and a special issues editor, leaving it to the editorial board to handle those duties. When the board expressed the need for a copy editor, Elsevier’s response, they said, was “to maintain that the editors should not be paying attention to language, grammar, readability, consistency, or accuracy of proper nomenclature or formatting.”

There is also a major restructuring of the editorial board underway that aims to reduce the number of associate editors by more than half, which “will result in fewer AEs handling far more papers, and on topics well outside their areas of expertise.”

Furthermore, there are plans to create a third-tier editorial board that functions largely in a figurehead capacity, after Elsevier “unilaterally took full control” of the board’s structure in 2023 by requiring all associate editors to renew their contracts annually—which the board believes undermines its editorial independence and integrity.

Worst practices

In-house production has been reduced or outsourced, and in 2023 Elsevier began using AI during production without informing the board, resulting in many style and formatting errors, as well as reversing versions of papers that had already been accepted and formatted by the editors. “This was highly embarrassing for the journal and resolution took six months and was achieved only through the persistent efforts of the editors,” the editors wrote. “AI processing continues to be used and regularly reformats submitted manuscripts to change meaning and formatting and require extensive author and editor oversight during proof stage.”

In addition, the author page charges for JHE are significantly higher than even Elsevier’s other for-profit journals, as well as broad-based open access journals like Scientific Reports. Not many of the journal’s authors can afford those fees, “which runs counter to the journal’s (and Elsevier’s) pledge of equality and inclusivity,” the editors wrote.

The breaking point seems to have come in November, when Elsevier informed co-editors Mark Grabowski (Liverpool John Moores University) and Andrea Taylor (Touro University California College of Osteopathic Medicine) that it was ending the dual-editor model that has been in place since 1986. When Grabowki and Taylor protested, they were told the model could only remain if they took a 50 percent cut in their compensation.

Elsevier has long had its share of vocal critics (including our own Chris Lee) and this latest development has added fuel to the fire. “Elsevier has, as usual, mismanaged the journal and done everything they could to maximize profit at the expense of quality,” biologist PZ Myers of the University of Minnesota Morris wrote on his blog Pharyngula. “In particular, they decided that human editors were too expensive, so they’re trying to do the job with AI. They also proposed cutting the pay for the editor-in-chief in half. Keep in mind that Elsevier charges authors a $3990 processing fee for each submission. I guess they needed to improve the economics of their piratical mode of operation a little more.”

Elsevier has not yet responded to Ars’ request for comment; we will update accordingly should a statement be issued.

Not all AI uses are created equal

John Hawks, an anthropologist at the University of Wisconsin, Madison, who has published 17 papers in JHE over his career, expressed his full support for the board members’ decision on his blog, along with shock at the (footnoted) revelation that Elsevier had introduced AI to its editorial process in 2023. “I’ve published four articles in the journal during the last two years, including one in press now, and if there was any notice to my co-authors or me about an AI production process, I don’t remember it,” he wrote, noting that the move violates the journal’s own AI policies. “Authors should be informed at the time of submission how AI will be used in their work. I would have submitted elsewhere if I was aware that AI would potentially be altering the meaning of the articles.”

There is certainly cause for concern when it comes to using AI in the pursuit of science. For instance, earlier this year, we witnessed the viral sensation of several egregiously bad AI-generated figures published in a peer-reviewed article in Frontiers, a reputable scientific journal. Scientists on social media expressed equal parts shock and ridicule at the images, one of which featured a rat with grotesquely large and bizarre genitals. The paper has since been retracted, but the incident reinforces a growing concern that AI will make published scientific research less trustworthy, even as it increases productivity.

That said, there are also some useful applications of AI in the scientific endeavor. For instance, back in January, the research publisher Science announced that all of its journals would begin using commercial software that automates the process of detecting improperly manipulated images. Perhaps that would have caught the egregious rat genitalia figure, although as Ars Science Editor John Timmer pointed out at the time, the software has limitations. “While it will catch some of the most egregious cases of image manipulation, enterprising fraudsters can easily avoid being caught if they know how the software operates,” he wrote.

Hawks acknowledged on his blog that the use of AI by scientists and scientific journals is likely inevitable and even recognizes the potential benefits. “I don’t think this is a dystopian future. But not all uses of machine learning are equal,” he wrote. To wit:

[I]t’s bad for anyone to use AI to reduce or replace the scientific input and oversight of people in research—whether that input comes from researchers, editors, reviewers, or readers. It’s stupid for a company to use AI to divert experts’ effort into redundant rounds of proofreading, or to make disseminating scientific work more difficult.

In this case, Elsevier may have been aiming for good but instead hit the exacta of bad and stupid. It’s especially galling that they demand transparency from authors but do not provide transparency about their own processes… [I]t would be a very good idea for authors of recent articles to make sure that they have posted a preprint somewhere, so that their original pre-AI version will be available for readers. As the editors lose access, corrections to published articles may become difficult or impossible.

Nature published an article back in March raising questions about the efficacy of mass resignations as an emerging form of protest after all the editors of the Wiley-published linguistics journal Syntax resigned in February. (Several of their concerns mirror those of the JHE editorial board.) Such moves certainly garner attention, but even former Syntax editor Klaus Abels of University College London told Nature that the objective of such mass resignations should be on moving beyond mere protest, focusing instead on establishing new independent nonprofit journals for the academic community that are open access and have high academic standards.

Abels and his former Syntax colleagues are in the process of doing just that, following the example of the former editors of Critical Public Health and another Elsevier journal, NeuroImage, last year.

Jennifer is a senior reporter at Ars Technica with a particular focus on where science meets culture, covering everything from physics and related interdisciplinary topics to her favorite films and TV series. Jennifer lives in Baltimore with her spouse, physicist Sean M. Carroll, and their two cats, Ariel and Caliban.

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Frogfish reveals how it evolved the “fishing rod” on its head

anglerfish, frogfish, oceanography, Science / Tim Belzer / December 30, 2024

In most bony fish, or teleosts, motor neurons for fins are found on the sides (ventrolateral zone) of the underside (ventral horn) of the spinal cord. The motor neurons controlling the illicium of frogfish are in their own cluster and located in the dorsolateral zone. In fish, this is unusual.

“The peculiar location of fishing motor neurons, with little doubt, is linked with the specialization of the illicium serving fishing behavior,” the team said in a study recently published in the Journal of Comparative Neurology.

Fishing for answers

So what does this have to do with evolution? The white-spotted pygmy filefish might look nothing like a frogfish and has no built-in fishing lure, but it is still a related species and can possibly tell us something.

While the first dorsal fin of the filefish doesn’t really move—it is thought that its main purpose is to scare off predators by looking menacing—there are still motor neurons that control it. Motor neurons for the first dorsal fin of filefish were found in the same location as motor neurons for the second, third and fourth dorsal fins in frogfish. In frogfish, these fins also do not move much while swimming, but can appear threatening to a predator.

If the same types of motor neurons control non-moving fins in both species, the frogfish has something extra when it comes to the function and location of motor neurons controlling the illicium.

Yamamoto thinks the unique group of fishing motor neurons found in frogfish suggests that, as a result of evolution, “the motor neurons for the illicium [became] segregated from other motor neurons” to end up in their own distinct cluster away from motor neurons controlling other fins, as he said in the study.

What exactly caused the functional and locational shift of motor neurons that give the frogfish’s illicium its function is still a mystery. How the brain influences their fishing behavior is another area that needs to be investigated.

While Yamamoto and his team speculate that specific regions of the brain send messages to the fishing motor neurons, they do not yet know which regions are involved, and say that more studies need to be carried out on other species of fish and the groups of motor neurons that power each of their dorsal fins.

In the meantime, the frogfish will continue being its freaky self.

Journal of Comparative Neurology, 2024. DOI: 10.1002/cne.25674

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Ten cool science stories we almost missed

bioengineering, experimental archaeology, fluid dynamics, forensic DNA, fractals, moral philosophy, music, Physics, Science, science and art, social psychology, statistical mechanics, supernova / Paul Patrick / December 30, 2024

Bronze Age combat, moral philosophy and Reddit’s AITA, Mondrian’s fractal tree, and seven other fascinating papers.

There is rarely time to write about every cool science paper that comes our way; many worthy candidates sadly fall through the cracks over the course of the year. But as 2024 comes to a close, we’ve gathered ten of our favorite such papers at the intersection of science and culture as a special treat, covering a broad range of topics: from reenacting Bronze Age spear combat and applying network theory to the music of Johann Sebastian Bach, to Spider-Man inspired web-slinging tech and a mathematical connection between a turbulent phase transition and your morning cup of coffee. Enjoy!

Reenacting Bronze Age spear combat

Experiment with experienced fighters who spar freely using different styles. — An experiment with experienced fighters who spar freely using different styles. Credit: Valerio Gentile/CC BY

The European Bronze Age saw the rise of institutionalized warfare, evidenced by the many spearheads and similar weaponry archaeologists have unearthed. But how might these artifacts be used in actual combat? Dutch researchers decided to find out by constructing replicas of Bronze Age shields and spears and using them in realistic combat scenarios. They described their findings in an October paper published in the Journal of Archaeological Science.

There have been a couple of prior experimental studies on bronze spears, but per Valerio Gentile (now at the University of Gottingen) and coauthors, practical research to date has been quite narrow in scope, focusing on throwing weapons against static shields. Coauthors C.J. van Dijk of the National Military Museum in the Netherlands and independent researcher O. Ter Mors each had more than a decade of experience teaching traditional martial arts, specializing in medieval polearms and one-handed weapons. So they were ideal candidates for testing the replica spears and shields.

Of course, there is no direct information on prehistoric fighting styles, so van Dijk and Mors relied on basic biomechanics of combat movements with similar weapons detailed in historic manuals. They ran three versions of the experiment: one focused on engagement and controlled collisions, another on delivering wounding body blows, and the third on free sparring. They then studied wear marks left on the spearheads and found they matched the marks found on similar genuine weapons excavated from Bronze Age sites. They also gleaned helpful clues to the skills required to use such weapons.

DOI: Journal of Archaeological Science, 2024. 10.1016/j.jas.2024.106044 (About DOIs).

Physics of Ned Kahn’s kinetic sculptures

Ned Kahn's Shimmer Wall, The Franklin Institute, Philadelphia, Pennsylvania. — Shimmer Wall, The Franklin Institute, Philadelphia, Pennsylvania. Credit: Ned Kahn

Environmental artist and sculptor Ned Kahn is famous for his kinematic building facades, inspired by his own background in science. An exterior wall on the Children’s Museum of Pittsburgh, for instance, consists of hundreds of flaps that move in response to wind, creating distinctive visual patterns. Kahn used the same method to create his Shimmer Wall at Philadelphia’s Franklin Institute, as well as several other similar projects.

Physicists at Sorbonne Universite in Paris have studied videos of Kahn’s kinetic facades and conducted experiments to measure the underlying physical mechanisms, outlined in a November paper published in the journal Physical Review Fluids. The authors analyzed 18 YouTube videos taken of six of Kahn’s kinematic facades, working with Kahn and building management to get the dimensions of the moving plates, scaling up from the video footage to get further information on spatial dimensions.

They also conducted their own wind tunnel experiments, using strings of pendulum plates. Their measurements confirmed that the kinetic patterns were propagating waves to create the flickering visual effects. The plates’ movement is driven primarily by their natural resonant frequencies at low speeds, and by pressure fluctuations from the wind at higher speeds.

DOI: Physical Review Fluids, 2024. 10.1103/PhysRevFluids.9.114604 (About DOIs).

How brewing coffee connects to turbulence

Trajectories in time traced out by turbulent puffs as they move along a simulated pipe and in experiments, with blue regions indicate the puff — Trajectories in time traced out by turbulent puffs as they move along a simulated pipe and in experiments, with blue regions indicate puff “traffic jams.” Credit: Grégoire Lemoult et al., 2024

Physicists have been studying turbulence for centuries, particularly the transitional period where flows shift from predictably smooth (laminar flow) to highly turbulent. That transition is marked by localized turbulent patches known as “puffs,” which often form in fluids flowing through a pipe or channel. In an October paper published in the journal Nature Physics, physicists used statistical mechanics to reveal an unexpected connection between the process of brewing coffee and the behavior of those puffs.

Traditional mathematical models of percolation date back to the 1940s. Directed percolation is when the flow occurs in a specific direction, akin to how water moves through freshly ground coffee beans, flowing down in the direction of gravity. There’s a sweet spot for the perfect cuppa, where the rate of flow is sufficiently slow to absorb most of the flavor from the beans, but also fast enough not to back up in the filter. That sweet spot in your coffee brewing process corresponds to the aforementioned laminar-turbulent transition in pipes.

Physicist Nigel Goldenfeld of the University of California, San Diego, and his coauthors used pressure sensors to monitor the formation of puffs in a pipe, focusing on how puff-to-puff interactions influenced each other’s motion. Next, they tried to mathematically model the relevant phase transitions to predict puff behavior. They found that the puffs behave much like cars moving on a freeway during rush hour: they are prone to traffic jams—i.e., when a turbulent patch matches the width of the pipe, causing other puffs to build up behind it—that form and dissipate on their own. And they tend to “melt” at the laminar-turbulent transition point.

DOI: Nature Physics, 2024. 10.1038/s41567-024-02513-0 (About DOIs).

Network theory and Bach’s music

In a network representation of music, notes are represented by nodes, and transition between notes are represented by directed edges connecting the nodes. Credit: S. Kulkarni et al., 2024

When you listen to music, does your ability to remember or anticipate the piece tell you anything about its structure? Physicists at the University of Pennsylvania developed a model based on network theory to do just that, describing their work in a February paper published in the journal Physical Review Research. Johann Sebastian Bach’s works were an ideal choice given the highly mathematical structure, plus the composer was so prolific, across so many very different kinds of musical compositions—preludes, fugues, chorales, toccatas, concertos, suites, and cantatas—as to allow for useful comparisons.

First, the authors built a simple “true” network for each composition, in which individual notes served as “nodes” and the transitions from note to note served as “edges” connecting them. Then they calculated the amount of information in each network. They found it was possible to tell the difference between compositional forms based on their information content (entropy). The more complex toccatas and fugues had the highest entropy, while simpler chorales had the lowest.

Next, the team wanted to quantify how effectively this information was communicated to the listener, a task made more difficult by the innate subjectivity of human perception. They developed a fuzzier “inferred” network model for this purpose, capturing an essential aspect of our perception: we find a balance between accuracy and cost, simplifying some details so as to make it easier for our brains to process incoming information like music.

The results: There were fewer differences between the true and inferred networks for Bach’s compositions than for randomly generated networks, suggesting that clustering and the frequent repetition of transitions (represented by thicker edges) in Bach networks were key to effectively communicating information to the listener. The next step is to build a multi-layered network model that incorporates elements like rhythm, timbre, chords, or counterpoint (a Bach specialty).

DOI: Physical Review Research, 2024. 10.1103/PhysRevResearch.6.013136 (About DOIs).

The philosophy of Reddit’s AITA

Count me among the many people practically addicted to Reddit’s “Am I the Asshole” (AITA) forum. It’s such a fascinating window into the intricacies of how flawed human beings navigate different relationships, whether personal or professional. That’s also what makes it a fantastic source of illustrative common-place dilemmas of moral decision-making for philosophers like Daniel Yudkin of the University of Pennsylvania. Relational context matters, as Yudkin and several co-authors ably demonstrated in a PsyArXiv preprint earlier this year.

For their study, Yudkin et al. compiled a dataset of nearly 370,000 AITA posts, along with over 11 million comments, posted between 2018 and 2021. They used machine learning to analyze the language used to sort all those posts into different categories. They relied on an existing taxonomy identifying six basic areas of moral concern: fairness/proportionality, feelings, harm/offense, honesty, relational obligation, and social norms.

Yudkin et al. identified 29 of the most common dilemmas in the AITA dataset and grouped them according to moral theme. Two of the most common were relational transgression and relational omission (failure to do what was expected), followed by behavioral over-reaction and unintended harm. Cheating and deliberate misrepresentation/dishonesty were the moral dilemmas rated most negatively in the dataset—even more so than intentional harm. Being judgmental was also evaluated very negatively, as it was often perceived as being self-righteous or hypocritical. The least negatively evaluated dilemmas were relational omissions.

As for relational context, cheating and broken promise dilemmas typically involved romantic partners like boyfriends rather than one’s mother, for example, while mother-related dilemmas more frequently fell under relational omission. Essentially, “people tend to disappoint their mothers but be disappointed by their boyfriends,” the authors wrote. Less close relationships, by contrast, tend to be governed by “norms of politeness and procedural fairness.” Hence, Yudkin et al. prefer to think of morality “less as a set of abstract principles and more as a ‘relational toolkit,’ guiding and constraining behavior according to the demands of the social situation.”

DOI: PsyArXiv, 2024. 10.31234/osf.io/5pcew (About DOIs).

Fractal scaling of trees in art

De grijze boom (Gray tree) Piet Mondrian, 1911. — *De grijze boom* (Gray tree) by Piet Mondrian, 1911. Credit: Public domain

Leonardo da Vinci famously invented a so-called “rule of trees” as a guide to realistically depicting trees in artistic representations according to their geometric proportions. In essence, if you took all the branches of a given tree, folded them up and compressed them into something resembling a trunk, that trunk would have the same thickness from top to bottom. That rule in turn implies a fractal branching pattern, with a scaling exponent of about 2 describing the proportions between the diameters of nearby boughs and the number of boughs with a given diameter.

According to the authors of a preprint posted to the physics arXiv in February, however, recent biological research suggests a higher scaling exponent of 3 known as Murray’s Law, for the rule of trees. Their analysis of 16th century Islamic architecture, Japanese paintings from the Edo period, and 20th century European art showed fractal scaling between 1.5 and 2.5. However, when they analyzed an abstract tree painting by Piet Mondrian, they found it exhibited fractal scaling of 3, before mathematicians had formulated Murray’s Law, even though Mondrian’s tree did not feature explicit branching.

The findings intrigued physicist Richard Taylor of the University of Oregon, whose work over the last 20 years includes analyzing fractal patterns in the paintings of Jackson Pollock. “In particular, I thought the extension to Mondrian’s ‘trees’ was impressive,” he told Ars earlier this year. “I like that it establishes a connection between abstract and representational forms. It makes me wonder what would happen if the same idea were to be applied to Pollock’s poured branchings.”

Taylor himself published a 2022 paper about climate change and how nature’s stress-reducing fractals might disappear in the future. “If we are pessimistic for a moment, and assume that climate change will inevitably impact nature’s fractals, then our only future source of fractal aesthetics will be through art, design and architecture,” he said. “This brings a very practical element to studies like [this].”

DOI: arXiv, 2024. 10.48550/arXiv.2402.13520 (About DOIs).

IDing George Washington’s descendants

Portrait of George Washington — A DNA study identified descendants of George Washington from unmarked remains. Credit: Public domain

DNA profiling is an incredibly useful tool in forensics, but the most common method—short tandem repeat (STR) analysis—typically doesn’t work when remains are especially degraded, especially if said remains have been preserved with embalming methods using formaldehyde. This includes the remains of US service members who died in such past conflicts as World War II, Korea, Vietnam, and the Cold War. That’s why scientists at the Armed Forces Medical Examiner System’s identification lab at the Dover Air Force Base have developed new DNA sequencing technologies.

They used those methods to identify the previously unmarked remains of descendants of George Washington, according to a March paper published in the journal iScience. The team tested three sets of remains and compared the results with those of a known living descendant, using methods for assessing paternal and maternal relationships, as well as a new method for next-generation sequencing data involving some 95,000 single-nucleotide polymorphisms (SNPs) in order to better predict more distant ancestry. The combined data confirmed that the remains belonged to Washington’s descendants and the new method should help do the same for the remains of as-yet-unidentified service members.

In related news, in July, forensic scientists successfully used descendant DNA to identify a victim of the 1921 Tulsa massacre in Oklahoma City, buried in a mass grave containing more than a hundred victims. C.L. Daniel was a World War I veteran, still in his 20s when he was killed. More than 120 such graves have been found since 2020, with DNA collected from around 30 sets of remains, but this is the first time those remains have been directly linked to the massacre. There are at least 17 other victims in the grave where Daniel’s remains were found.

DOI: iScience, 2024. 10.1016/j.isci.2024.109353 (About DOIs).

Spidey-inspired web-slinging tech

stream of liquid silk quickly turns to a strong fiber that sticks to and lifts objects. Credit: Marco Lo Presti et al., 2024

Over the years, researchers in Tufts University’s Silklab have come up with all kinds of ingenious bio-inspired uses for the sticky fibers found in silk moth cocoons: adhesive glues, printable sensors, edible coatings, and light-collecting materials for solar cells, to name a few. Their latest innovation is a web-slinging technology inspired by Spider-Man’s ability to shoot webbing from his wrists, described in an October paper published in the journal Advanced Functional Materials.

Coauthor Marco Lo Presti was cleaning glassware with acetone in the lab one day when he noticed something that looked a lot like webbing forming on the bottom of a glass. He realized this could be the key to better replicating spider threads for the purpose of shooting the fibers from a device like Spider-Man—something actual spiders don’t do. (They spin the silk, find a surface, and draw out lines of silk to build webs.)

The team boiled silk moth cocoons in a solution to break them down into proteins called fibroin. The fibroin was then extruded through bore needles into a stream. Spiking the fibroin solution with just the right additives will cause it to solidify into fiber once it comes into contact with air. For the web-slinging technology, they added dopamine to the fibroin solution and then shot it through a needle in which the solution was surrounded by a layer of acetone, which triggered solidification.

The acetone quickly evaporated, leaving just the webbing attached to whatever object it happened it hit. The team tested the resulting fibers and found they could lift a steel bolt, a tube floating on water, a partially buried scalpel and a wooden block—all from as far away as 12 centimeters. Sure, natural spider silk is still about 1000 times stronger than these fibers, but it’s still a significant step forward that paves the way for future novel technological applications.

DOI: Advanced Functional Materials, 2024. 10.1002/adfm.202414219

Solving a mystery of a 12th century supernova

Pa 30 is the supernova remnant of SN 1181. Credit: unWISE (D. Lang)/CC BY-SA 4.0

In 1181, astronomers in China and Japan recorded the appearance of a “guest star” that shone as bright as Saturn and was visible in the sky for six months. We now know it was a supernova (SN1181), one of only five such known events occurring in our Milky Way. Astronomers got a closer look at the remnant of that supernova and have determined the nature of strange filaments resembling dandelion petals that emanate from a “zombie star” at its center, according to an October paper published in The Astrophysical Journal Letters.

The Chinese and Japanese astronomers only recorded an approximate location for the unusual sighting, and for centuries no one managed to make a confirmed identification of a likely remnant from that supernova. Then, in 2021, astronomers measured the speed of expansion of a nebula known as Pa 30, which enabled them to determine its age: around 1,000 years, roughly coinciding with the recorded appearance of SN1181. PA 30 is an unusual remnant because of its zombie star—most likely itself a remnant of the original white dwarf that produced the supernova.

This latest study relied on data collected by Caltech’s Keck Cosmic Web Imager, a spectrograph at the Keck Observatory in Hawaii. One of the unique features of this instrument is that it can measure the motion of matter in a supernova and use that data to create something akin to a 3D movie of the explosion. The authors were able to create such a 3D map of P 30 and calculated that the zombie star’s filaments have ballistic motion, moving at approximately 1,000 kilometers per second.

Nor has that velocity changed since the explosion, enabling them to date that event almost exactly to 1181. And the findings raised fresh questions—namely, the ejected filament material is asymmetrical—which is unusual for a supernova remnant. The authors suggest that asymmetry may originate with the initial explosion.

There’s also a weird inner gap around the zombie star. Both will be the focus of further research.

DOI: Astrophysical Journal Letters, 2024. 10.3847/2041-8213/ad713b (About DOIs).

Reviving a “lost” 16th century score

manuscript page of Aberdeen Breviary : Volume 1 or 'Pars Hiemalis' — Fragment of music from The Aberdeen Breviary: Volume 1 Credit: National Library of Scotland /CC BY 4.0

Never underestimate the importance of marginalia in old manuscripts. Scholars from the University of Edinburgh and KU Leuven in Belgium can attest to that, having discovered a fragment of “lost” music from 16th-century pre-Reformation Scotland in a collection of worship texts. The team was even able to reconstruct the fragment and record it to get a sense of what music sounded like from that period in northeast Scotland, as detailed in a December paper published in the journal Music and Letters.

King James IV of Scotland commissioned the printing of several copies of The Aberdeen Breviary—a collection of prayers, hymns, readings, and psalms for daily worship—so that his subjects wouldn’t have to import such texts from England or Europe. One 1510 copy, known as the “Glamis copy,” is currently housed in the National Library of Scotland in Edinburgh. It was while examining handwritten annotations in this copy that the authors discovered the musical fragment on a page bound into the book—so it hadn’t been slipped between the pages at a later date.

The team figured out the piece was polyphonic, and then realized it was the tenor part from a harmonization for three or four voices of the hymn “Cultor Dei,” typically sung at night during Lent. (You can listen to a recording of the reconstructed composition here.) The authors also traced some of the history of this copy of The Aberdeen Breviary, including its use at one point by a rural chaplain at Aberdeen Cathedral, before a Scottish Catholic acquired it as a family heirloom.

“Identifying a piece of music is a real ‘Eureka’ moment for musicologists,” said coauthor David Coney of Edinburgh College of Art. “Better still, the fact that our tenor part is a harmony to a well-known melody means we can reconstruct the other missing parts. As a result, from just one line of music scrawled on a blank page, we can hear a hymn that had lain silent for nearly five centuries, a small but precious artifact of Scotland’s musical and religious traditions.”

DOI: Music and Letters, 2024. 10.1093/ml/gcae076 (About DOIs).

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A Cold War mystery: Why did Jimmy Carter save the space shuttle?

Jimmy Carter, NASA, Science, Space, Space shuttle / Rejus Almole / December 30, 2024

Ars solves the mystery by going directly to a primary source—the president himself.

The first launch of the space shuttle finally came on April 12, 1981. Credit: NASA

With 39th President Jimmy Carter passing away at the age of 100, we are revisiting this story of how he unexpectedly saved the space shuttle.

We’d been chatting for the better part of two hours when Chris Kraft’s eyes suddenly brightened. “Hey,” he said, “Here’s a story I’ll bet you never heard.” Kraft, the man who had written flight rules for NASA at the dawn of US spaceflight and supervised the Apollo program, had invited me to his home south of Houston for one of our periodic talks about space policy and space history. As we sat in recliners upstairs, in a den overlooking the Bay Oaks Country Club, Kraft told me about a time the space shuttle almost got canceled.

It was the late 1970s, when Kraft directed the Johnson Space Center, the home of the space shuttle program. At the time, the winged vehicle had progressed deep into a development phase that started in 1971. Because the program had not received enough money to cover development costs, some aspects of the vehicle (such as its thermal protective tiles) were delayed into future budget cycles. In another budget trick, NASA committed $158 million in fiscal year 1979 funds for work done during the previous fiscal year.

This could not go on, and according to Kraft the situation boiled over during a 1978 meeting in a large conference floor on the 9th floor of Building 1, the Houston center’s headquarters. All the program managers and other center directors gathered there along with NASA’s top leadership. That meeting included Administrator Robert Frosch, a physicist President Carter had appointed a year earlier.

Kraft recalls laying bare the budget jeopardy faced by the shuttle. “We were totally incapable of meeting any sort of flight schedule,” he said. Further postponing the vehicle would only add to the problem because the vehicle’s high payroll costs would just be carried forward.

There were two possible solutions proposed, Kraft said. One was a large funding supplement to get development programs back on track. Absent that, senior leaders felt they would have to declare the shuttle a research vehicle, like the rocket-powered X-15, which had made 13 flights to an altitude as high as 50 miles in the 1960s. “We were going to have to turn it, really, into a nothing vehicle,” Kraft said. “We were going to have to give up on the shuttle being a delivery vehicle into orbit.”

On the eve of the 40th anniversary of the first human landing on the Moon, *Apollo 11* crew members, Buzz Aldrin, left, Michael Collins, and Neil Armstrong and NASA Mission Control creator Chris Kraft, right, during their visit to the National Air and Space Museum on July 19, 2009. Credit: NASA/Getty Images

Armed with these bleak options, Frosch returned to Washington. Some time later he would meet with Carter, not expecting a positive response, as the president had never been a great friend to the space program. But Carter, according to Kraft, had just returned from Strategic Arms Limitation Talks (SALT) in Vienna, and he had spoken with the Soviet leader, Leonid Brezhnev, about how the United States was going to be able to fly the shuttle over Moscow continuously to ensure they were compliant with the agreements.

So when Frosch went to the White House to meet with the president and said NASA didn’t have the money to finish the space shuttle, the administrator got a response he did not expect: “How much do you need?”

In doing so, Jimmy Carter saved the space shuttle, Kraft believes. Without supplementals for fiscal year 1979 and 1980, the shuttle would never have flown, at least not as the iconic vehicle that would eventually fly 135 missions and 355 individual fliers into space. It took some flights as high as 400 miles above the planet before retiring five years ago this week. “That was the first supplemental NASA had ever asked for,” Kraft said. “And we got that money from Jimmy Carter.”

As I walked out of Kraft’s house that afternoon in late spring, I recall wondering whether this could really be true. Could Jimmy Carter, of all people, be the savior of the shuttle? All because he had been bragging about the shuttle’s capabilities to the Soviets and, therefore, didn’t want to show weakness? This Cold War mystery was now nearly 40 years in the past, but most of the protagonists still lived. So I began to ask questions.

Carter’s apathy toward space

At the root of my skepticism was this simple fact—Jimmy Carter was no great friend to the space program or, at least initially, the shuttle. Less than five months after he became president, on the date of June 9, 1977, Carter wrote the following in his White House Diary: “We continued our budget meetings. It’s obvious that the space shuttle is just a contrivance to keep NASA alive, and that no real need for the space shuttle was determined before the massive construction program was initiated.”

On NASA’s own 50th anniversary website, space historian John Logsdon described the Carter presidency in less than flattering terms. “Jimmy Carter was perhaps the least supportive of US human space efforts of any president in the last half-century,” Logsdon wrote.

In 1978 President Jimmy Carter visited Kennedy Space Center to check on the space shuttle’s progress and participate in an awards ceremony. Here he is greeted by Kennedy Space Center Director Lee Scherer. NASA

Then there was Carter’s vice president, Walter Mondale, who in 1972 had called the space shuttle a “senseless extravaganza.” A senator from Minnesota at the time, Mondale had vigorously opposed early funding measures to begin development of the shuttle. His views exemplified those who believed the United States had more pressing needs for its money than chasing the stars.

“I believe it would be unconscionable to embark on a project of such staggering cost when many of our citizens are malnourished, when our rivers and lakes are polluted, and when our cities and rural areas are dying,” Mondale argued during one debate over shuttle funding. “What are our values? What do we think is more important?”

Now these two men were responsible for establishing priorities for the government’s budget and supporting a shuttle that was already years behind schedule as it faced cost overruns of hundreds of millions of dollars. They were going to keep the program afloat?

The shuttle, canceled?

If Kraft is to be believed, cost overruns began really catching up to the shuttle program in 1978, necessitating the big meeting at Johnson Space Center. By then the Enterprise had already made its first free flight in the atmosphere, and the test vehicle was a public relations success. However, the programs to develop the space shuttle’s main engines and its thermal protective tiles remained far behind schedule. It does not seem beyond the realm of possibility that the program might be canceled altogether and that program managers might have worried about this.

John Logsdon, the eminent space historian who has written books about Nixon’s space policy and is working on one about Reagan, told Ars that as costs mounted, the White House Office of Management and Budget suggested to Carter that he might want to cancel the program in 1978 and 1979. This set off a series of White House meetings that culminated in an influential memo to Carter from Brigadier General Robert Rosenberg, of the National Security Council. Titled “Why Shuttle Is Needed,” the Rosenberg memo offered an effective counterpoint to the OMB concerns about cost, according to Logsdon. Written in November 1979, it helped lead Carter to a decision to fund the vehicle.

The crew of *Star Trek* gathers around space shuttle *Enterprise* in 1977. Credit: NASA

“Strong national support and prestige is focused on Shuttle as a means for maintaining space dominance as evidenced by broad user interest and recent space policy statements,” Rosenberg wrote. “Significant delay or abandonment of the Shuttle and manned space capabilities at this time would be viewed as a loss of national pride and direction. The notion that we are forced for short term economic reasons to abandon a major area of endeavor in which we have achieved world leadership at great cost is simply not credible.”

A key player in the shuttle program at this time, Robert Thompson, pushed back on the idea that the shuttle was ever at any real risk of being canceled. Thompson and Kraft are contemporaries. They were classmates at Virginia Tech University in the early 1940s, and later both were original members of the Space Task Group that put together Project Mercury. When Kraft managed flight operations during the Apollo Program, Thompson was in charge of capsule recovery. Ultimately Thompson became the first shuttle program manager in 1970, a post he headed until 1981. Today, Thompson lives about a mile away from Kraft, and his home overlooks the same golf course.

“I never worried an instant about Carter cutting the funding off,” he said in an interview at his dining room table. “You’d have to be an idiot to get up in front of people and say, ‘I’m now going to trash $5 billion even though we’re that close to the finish line, and I’m going to quit human spaceflight.’ Carter was kind of an oddball guy to be president, but he wasn’t stupid.”

So why wasn’t it canceled?

Still, there seem to be valid reasons for concern about a program that would ultimately run three years behind schedule and, according to NASA’s comptroller, about 30 percent over its initial $5.15 billion estimated development cost. Why did Carter remain so steadfastly behind the shuttle? Was it really because Carter valued the shuttle in his arms control discussions with the Soviet Union? The answer appears to be yes.

“It is conceivable that one of his arguments to Brezhnev on why there should be SALT was our ability to use the shuttle to verify the agreements,” Logsdon said. Whereas the president unquestionably felt lukewarm toward spaceflight, he felt conversely strong about arms control. And to verify that the Soviet Union was complying with the treaty, the United States would need a constellation of spy satellites. Back in 1970, to win Department of Defense support at the program’s outset, NASA had redesigned the shuttle to launch national security payloads. Now, that decision paid off.

A book about Carter’s space policy, Back Down to Earth by Mark Damohn, draws this conclusion about a president who liked NASA’s robotic exploration and science but didn’t see the value of humans in space. “The ability of the shuttle to launch arms control verification satellites is what saved it during the Carter administration,” Damohn writes. His book does not recount any meetings with Brezhnev. When asked whether Carter might have discussed the shuttle with the Soviet general secretary and whether that might have influenced his decisions, Damohn replied that Kraft’s story is essentially correct except for the part of Carter bragging to Brezhnev. Bragging is not in Carter’s personality, Damohn told Ars.

Another person who could verify or debunk Kraft’s anecdote is Frosch himself, who left NASA in 1981 and remains a senior research fellow at Harvard’s Kennedy School of Government. After I related Kraft’s story, Frosch said he didn’t recall a Brezhnev connection with Carter’s decision to support shuttle funding. “That does not mean it’s not true,” he added. “I just don’t remember any clear sequence like that. But it’s certainly possible if the dates fit together correctly.”

The timeline

Do the dates fit together? For some of the story, yes, and for other parts, no. Kraft recounted fiscal problems plaguing the space shuttle program in 1977 and 1978 that delayed development of the space shuttle’s main engines, thermal protection system, and other flight critical elements. According to TA Heppenheimer’s excellent History of the Space Shuttle, by May of 1979 the shuttle’s costs had already run $830 million over the initial $5.2 billion projected cost.

Moreover, by the time of Kraft’s come-to-Jesus meeting with the shuttle program managers and Frosch at Johnson Space Center, the vehicle had already missed its original March 1978 flight date. Ultimately, the vehicle would not fly until April 12, 1981.

It is also true that the White House provided additional funding when NASA needed it most. The president approved a $185 million supplemental for fiscal year 1979 to address the technical and manufacturing delays, and NASA would receive another $300 million supplemental for the fiscal year 1980 budget. The message from Carter to his OMB officials at this time regarding these supplementals was clear—“find the money.”

What is not consistent with Kraft’s narrative is the notion that Carter bragged about the shuttle to Brezhnev and then felt compelled to follow through with the shuttle’s development for this reason. The 1979 supplemental was formally signed into law by Carter on June 4, 1979, and by then he had already greenlit another supplemental for 1980. These dates are important, because Carter did not meet with Brezhnev in Vienna to sign the SALT II Treaty until June 15.

United States President Jimmy Carter, left, and Leonid Brezhnev, First Secretary of the Communist Party of the Soviet Union, welcomed journalists to the Soviet Embassy in Vienna, Austria, on June 17, 1979, on the eve of the signing of the SALT II treaty limiting strategic arms. Credit: AFP/Getty Images

This means Carter could not have “bragged” about the shuttle and then have funded it. However, this does not mean the talks with Brezhnev had zero influence on Carter’s feelings for the space shuttle during the last 18 months of his turbulent presidency.

By 1980, amid double-digit inflation, spiraling gas prices, and Ayatollah Khomeini’s revolution in Iran, the United States was slipping into another recession. As part of that year’s budget process, the president sought broad spending cuts. Administration officials told NASA to find budget cuts of $460 million to $860 million for the coming fiscal year.

But ultimately, NASA’s budget was spared. Heppenheimer’s book says this happened because “Carter exempted the Pentagon from these cutbacks, which meant that the Defense Department could stand fast in the wake of Moscow’s invasion of Afghanistan. This exemption gave Frosch an opening, as he argued that the shuttle should also be spared from cutbacks on national security grounds.” The president agreed.

Effectively, then, the shuttle program received extra funding in 1980 from a president that did not support human spaceflight and a vice president that adamantly opposed it. The funds came during a recession when the rest of the federal government was undergoing significant budget cuts. That is perhaps a greater marvel than the majestic orbiters themselves.

The ultimate source

For some perspective on all of this, Ars reached out to Carter through Steven Hochman, director of research at The Carter Center. He hadn’t heard the Brezhnev-space shuttle story, but he was happy to assist our reporting by bringing some questions to the 39th president of the United States.

Why did the president ultimately support funding the shuttle in its time of need? “I was not enthusiastic about sending humans on missions to Mars or outer space,” Carter told Ars. “But I thought the shuttle was a good way to continue the good work of NASA. I didn’t want to waste the money already invested.”

Carter also confirmed that he did, in fact, discuss the space shuttle and its capabilities with Brezhnev at the SALT II Treaty meetings in Vienna in June 1979. “I did explain to the Soviets that the space shuttle was peaceful, would not carry weapons, and would always land in the US,” Carter explained.

Finally, Hochman reviewed Carter’s schedule and found that the president had met with Frosch four times, including a brief discussion on July 11, 1979 at Camp David with the NASA administrator. This came shortly after the final treaty negotiations in Vienna. Hochman said it would not have been at all surprising if Carter discussed with Frosch that he mentioned the shuttle during the Brezhnev meeting.

From this we can draw a few conclusions—principally that despite some timeline inconsistencies, Kraft’s story appears to be mostly true. The shuttle program was in big trouble and could have been canceled or drastically modified had Carter not stepped in. Moreover, this was not a drawn out process. By all accounts Carter acted swiftly in the shuttle’s time of need. One of Carter’s primary motivations in doing so was enforcing the SALT II Treaty and, critically, Carter discussed the shuttle with Brezhnev during the treaty meetings. Important presidential decisions about the shuttle were made before and after the treaty meetings.

Perhaps what stands out most of all is the lasting, yet almost completely forgotten impact Carter had on this country’s space legacy. Despite just a passing interest in human space exploration, Carter ultimately played a pivotal role in ensuring that the longest-flying US spacecraft in history got built. That decision was instrumental, too, in development of the International Space Station. After all, NASA’s primary purpose for the shuttle was to eventually build an orbital station.

As someone who championed peace during his post-presidency, Carter no doubt would welcome the station’s driving idea of building an international consensus to work together in space. And ironically, after the shuttle finally stopped flying in 2011, America would come to rely on Russia to get into space. Today, we work with the very Cold War enemies with whom Carter negotiated arms treaties, contended with in Afghanistan, and vowed to watch closely from the orbital vehicle he shepherded across the finish line.

Eric Berger is the senior space editor at Ars Technica, covering everything from astronomy to private space to NASA policy, and author of two books: Liftoff, about the rise of SpaceX; and Reentry, on the development of the Falcon 9 rocket and Dragon. A certified meteorologist, Eric lives in Houston.

A Cold War mystery: Why did Jimmy Carter save the space shuttle? Read More »

When does your brain think something is worth the wait?

Science / Mike M. / December 30, 2024

Whether it’s braving the long line at a trendy new restaurant or hanging on just a few minutes longer to see if there’s a post-credits scene after a movie, the decision to persevere or ditch it depends on specific regions of our brains.

Waiting is not always about self-control. Deciding to wait (or not to wait) also involves gauging the value of the potential reward. In an experiment that investigated wait times among people with lesions in the frontal cortex of the brain, University of Pennsylvania psychologist Joe Kable and his research team found that subjects with damage to certain regions of the prefrontal cortex were less likely to wait things out.

“[Our] findings suggest that regions of the frontal cortex make computationally distinct contributions to adaptive persistence,” he and his team said in a study recently published in the Journal of Neuroscience.

Wait for it

Kable looked for subjects with damage to three parts of the prefrontal cortex: the ventromedial prefrontal cortex, dorsomedial prefrontal cortex and anterior insula. Their behavior was compared to both healthy controls and controls with lesions in the other parts of the frontal cortex.

The ventromedial prefrontal cortex is involved with action control, memory, and making decisions. The dorsomedial prefrontal cortex is even more important when it comes to decision-making; it also has an integral role in regulating cognition, emotion, and action. The anterior insula regulates how subjective feelings are processed. The performance of subjects with lesions in these areas was compared not just to healthy controls, but controls with lesions in other regions of the frontal cortex.

Participants sitting in front of a computer screen were told that a coin would appear on the screen. That coin was supposed to increase in value over time and change color when its value matured. It could then be sold for a 10 cent reward by pressing the space bar. Even if the coin hadn’t matured yet, the space bar could still be pressed to stop the waiting period and make a new coin appear, though they missed out on the 10 cents.

What nobody participating in this experiment knew was that the coins’ maturation followed one of two patterns. In the high-persistence pattern, the coin could mature any time during a period of 20 seconds, so waiting was the best strategy. Conversely, in the limited-persistence alternative, it was optimal to stop waiting a little after two seconds if the coin didn’t mature by then, because if it didn’t, it would go without maturing for the full 40 seconds The purpose of this test was to make as much money as possible in 12 minutes.

When does your brain think something is worth the wait? Read More »

After 60 years of spaceflight patches, here are some of our favorites

mission patches, Science, Space / Paul Patrick / December 29, 2024

A picture’s worth 1,000 words

It turns out the US spy satellite agency is the best of the best at patch design.

NROL-61 is the iconic “Spike” patch. Credit: NRO

The art of space mission patches is now more than six decades old, dating to the Vostok 6 mission in 1963 that carried Soviet cosmonaut Valentina Tereshkova into low-Earth orbit for nearly three days. The patch for the first female human spaceflight showcased a dove flying above the letters designating the Soviet Union, CCCP.

That patch was not publicly revealed at the time, and the use of specially designed patches was employed only infrequently by subsequent Soviet missions. NASA’s first mission patch would not follow for two years, but the practice would prove more sticky for missions in the United States and become a time-honored tradition.

The first NASA flight to produce a mission-specific patch worn by crew members was Gemini 5. It flew in August 1965, carrying astronauts Gordon Cooper and Pete Conrad on an eight-day mission inside a small Gemini spacecraft. At the time, it was the longest spaceflight conducted by anyone.

Robert Pearlman has the story behind the patch at Collect Space, which came about because of the wishes of the crew. During the initial Mercury missions, the pilots were able to name their spacecraft—Freedom 7, Liberty Bell 7, and so on. Cooper had named his Mercury spacecraft ‘Faith 7.’ But an increasingly buttoned-up NASA ended this practice for the Gemini missions, and when Cooper and Conrad were assigned to the third Gemini flight they considered alternatives.

Gemini 5 mission patch. Note the “8 days or bust” messaging on the wagon was covered up until after the mission was completed. Credit: NASA

“Several months before mission, I mentioned to Pete that I’d never been in a military organization that didn’t have its own patch,” Cooper recounted in Leap of Faith, his memoir. “We decided right then and there that we were at least going to have a patch for our flight.”

They chose a covered wagon design to indicate the pioneering nature of the mission and came up with the “8 days or bust” slogan to highlight the extended duration of the flight. Since then, virtually every NASA mission has included a patch design, typically with names of the crew members. The tradition has extended to non-human missions and has generally been adopted by space agencies around the world.

As such, there is a rich tradition of space mission patches to draw on, and we thought it would be fun to share some of our favorites over the decades.

Apollo 11 mission patch. NASA

Apollo 11

The first human mission to land on the Moon is one of the only NASA mission patches that does not include the names of the crew members, Neil Armstrong, Buzz Aldrin, and Michael Collins. This was a deliberate choice by the crew, who wanted the world to understand they were traveling to the Moon for all of humanity.

Another NASA astronaut, Jim Lovell, suggested the bald eagle could be the focus of the patch. Collins traced the eagle from a National Geographic children’s magazine, and an olive branch was added as a symbol of the mission’s peaceful intent.

The result is a clear symbol of the United States leading humanity to another world. It is simple and powerful.

Skylab rescue mission

Skylab was NASA’s first space station, and it was launched into orbit after the final Apollo lunar landing in 1972. From May 1973 to February 1974, three different crews occupied the space station, which had been placed in orbit by a modified Saturn V rocket.

Due to some problems with leaky thrusters on the Apollo spacecraft that carried the second crew to Skylab in 1973, NASA scrambled to put together a ‘rescue’ mission as a contingency. In this rescue scenario, astronauts Vance Brand and Don Lind would have flown to the station and brought Alan Bean, Jack Lousma, and Owen Garriott back inside an Apollo capsule especially configured for five people.

Ultimately, NASA decided that the crew could return to Earth in the faulty Apollo spacecraft, with the use of just half of the vehicle’s thrusters. So Brand and Lind never flew the rescue mission. But we got a pretty awesome patch out of the deal.

Space shuttle program

With the space shuttle, astronauts and patch artists had to get more creative because the vehicle flew so frequently—eventually launching 135 times. Some of my favorite patches from these flights came fairly early on in the program.

As it turns out, designing shuttle mission patches was a bonding exercise for crews after their assignments. Often one of the less experienced crew members would be given leadership of the project.

“During the Shuttle era, designing a mission emblem was one of the first tasks assigned to a newly formed crew of astronauts,” Flag Research Quarterly reports. “Within NASA, creation of the patch design was considered to be an important team-building exercise. The crew understood that they were not just designing a patch to wear on their flight suits, but that they were also creating a symbol for everyone who was working on the flight.”

In some cases the crews commissioned a well-known graphic designer or space artist to help them with their patch designs. More typically they worked with a graphic designer on staff at the Johnson Space Center to finalize the design.

NROL-61 is the iconic “Spike” patch. NRO

National Reconnaissance Office

The activities of the US National Reconnaissance Office, which is responsible for the design and launching of spy satellites, are very often shrouded in secret.

However, the spy satellite agency cleverly uses its mission patches as an effective communications tool. The patches for the launch of its satellites never give away key details, but they are often humorous, ominous, and suggestive all at the same time. The immediate response I often have to these patches is one of appreciation for the design, followed by a nervous chuckle. I suspect that’s intended by the spy agency.

In any case, these are my choices for the best space patches ever, perhaps because they are developed with such abandon.

The Soyuz TM-24 mission to Mir in 1996 carried ESA astronaut Reinhold Ewald.

European Space Agency

The space agency that consists of a couple of dozen European nations has also created some banger patches over the years that both recognize the continent’s long history of scientific discovery—with Newton, Kepler, Galileo, and Curie to name but a few—and the potential for future discovery in space.

Attached are some of my personal favorites, which highlight the launch of European astronauts on the Russian Soyuz spacecraft to three different Russian space stations across three decades.

What I like about the European mission designs is that they are unique and not afraid to break from the traditional mold of patch design. They’re also beautiful!

The Demo-2 mission patch is iconic in every way.

SpaceX mission patches

In recent years, some of the most creative patch designs have come from SpaceX and its crewed spaceflights aboard the Dragon vehicle. Because of the spacecraft’s name, the missions have often played off the Dragon motif, making for some striking designs.

There is a dedicated community of patch collectors out there, and some of them were disappointed that SpaceX stopped designing patches for each individual Starlink mission a few years ago. However, I would say that buying two or three patches a week would have gotten pretty expensive, pretty fast—not to mention the challenge designers would face in making unique patches for each flight.

If you read this far and want to know my preference, I am not much of a patch collector, as much as I admire the effort and artistry that goes into each design. I have only ever bought one patch, the one designed for the Falcon 1 rocket’s fourth flight. The patch isn’t beautiful, but it’s got some nice touches, including lights for both Kwajalein and Omelek islands, where the company launched its first rockets. Also, it was the first time the company included a shamrock on the patch, and that proved fortuitous, as the successful launch in 2008 saved the company. It has become a trademark of SpaceX patches ever since.

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The physics of ugly Christmas sweaters

knitting, materials science, Physics, Science, ugly Christmas sweaters / Paul Patrick / December 27, 2024

In 2018, a team of French physicists developed a rudimentary mathematical model to describe the deformation of a common type of knit. Their work was inspired when co-author Frédéric Lechenault watched his pregnant wife knitting baby booties and blankets, and he noted how the items would return to their original shape even after being stretched. With a few colleagues, he was able to boil the mechanics down to a few simple equations, adaptable to different stitch patterns. It all comes down to three factors: the “bendiness” of the yarn, the length of the yarn, and how many crossing points are in each stitch.

A simpler stitch

A simplified model of how yarns interact Credit: J. Crassous/University of Rennes

One of the co-authors of that 2018 paper, Samuel Poincloux of Aoyama Gakuin University in Japan, also co-authored this latest study with two other colleagues, Jérôme Crassous (University of Rennes in France) and Audrey Steinberger (University of Lyon). This time around, Poincloux was interested in the knotty problem of predicting the rest shape of a knitted fabric, given the yarn’s length by stitch—an open question dating back at least to a 1959 paper.

It’s the complex geometry of all the friction-producing contact zones between the slender elastic fibers that makes such a system too difficult to model precisely, because the contact zones can rotate or change shape as the fabric moves. Poincloux and his cohorts came up with their own more simplified model.

The team performed experiments with a Jersey stitch knit (aka a stockinette), a widely used and simple knit consisting of a single yarn (in this case, a nylon thread) forming interlocked loops. They also ran numerical simulations modeled on discrete elastic rods coupled with dry contacts with a specific friction coefficient to form meshes.

The results: Even when there were no external stresses applied to the fabric, the friction between the threads served as a stabilizing factor. And there was no single form of equilibrium for a knitted sweater’s resting shape; rather, there were multiple metastable states that were dependent on the fabric’s history—the different ways it had been folded, stretched, or rumpled. In short, “Knitted fabrics do not have a unique shape when no forces are applied, contrary to the relatively common belief in textile literature,” said Crassous.

DOI: Physical Review Letters, 2024. 10.1103/PhysRevLett.133.248201 (About DOIs).

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Could microwaved grapes be used for quantum sensing?

applied physics, microwaving grapes, Physics, quantum sensing, Science / Tim Belzer / December 27, 2024

The microwaved grape trick also shows their promise as alternative microwave resonators for quantum sensing applications, according to the authors of this latest paper. Those applications include satellite technology, masers, microwave photon detection, hunting for axions (a dark matter candidate), and various quantum systems, and driving spin in superconducting qubits for quantum computing, among others.

Prior research had specifically investigated the electrical fields behind the plasma effect. “We showed that grape pairs can also enhance magnetic fields which are crucial for quantum sensing applications,” said co-author Ali Fawaz, a graduate student at Macquarie University.

Fawaz and co-authors used specially fabricated nanodiamonds for their experiments. Unlike pure diamonds, which are colorless, some of the carbon atoms in the nanodiamonds were replaced, creating tiny defect centers that act like tiny magnets, making them ideal for quantum sensing. Sapphires are typically used for this purpose, but Fawaz et al. realized that water conducts microwave energy better than sapphires—and grapes are mostly water.

So the team placed a nanodiamond atop a thin glass fiber and placed it between two grapes. Then they shone green laser light through the fiber, making the defect centers glow red. Measuring the brightness told them the strength of the magnetic field around the grapes, which turned out to be twice as strong with grapes than without.

The size and shape of the grapes used in the experiments proved crucial; they must be about 27 millimeters long to get concentrated microwave energy at just the right frequency for the quantum sensor. The biggest catch is that using the grapes proved to be less stable with more energy loss. Future research may identify more reliable potential materials to achieve a similar effect.

DOI: Physical Review Applied, 2024. 10.1103/PhysRevApplied.22.064078 (About DOIs).

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Magnetic shape-shifting surface can move stuff without grasping it

Science / Tim Belzer / December 27, 2024

A kirigami design where the cuts’ length-to-width ratio was six was way more responsive to magnets, and that, in turn, enhanced an effect known as magnetically induced stiffening. With no magnets around, the kirigami disk was way more compliant than one without cuts. But when a magnetic field was applied, it became more than 1.8 times stiffer.

Overall, the kirigami dome could lift an object weighing 43.1 grams (28 times its own weight) to a height of 2.5 millimeters and hold it there. To test what this technology could do, Yin’s team built a 5×5 array of domes actuated by movable permanent magnetic pillars placed underneath that could move left or right, or spin. The array could precisely move droplets, potato chips, a leaf, and even a small wooden plank. It could also rotate a petri dish.

Next-gen haptics

The team thinks one possible application for this technology is precise transport and mixing of very tiny amounts of fluids in research laboratories. But there is another, arguably more exciting option. Chi’s shape-shifting surface is very fast; it reacts to changes in the magnetic field in under 2 milliseconds, which is a response time rivaling gaming monitors.

This, according to the team, makes it possible to use in haptic feedback controllers. Super-fast, magnetically actuated shape-shifting surfaces could emulate the sense of touch, texture, and feel of the objects you interact with wearing your VR goggles. “I’m new to haptics, but considering you can change the stiffness of our surfaces by modulating the magnetic field, this should enable us to recreate different haptic perceptions,” Yin says.

Before that becomes a reality, there is one more limitation the team must overcome.

If you compared Yin’s shape-shifting surface to a display where each dome stands for a single pixel, the resolution of this display would be very low. “So, there is the question how small can you make those domes,” Yin says. He suggested that, with advanced manufacturing techniques, it is possible to miniaturize the domes down to around 10 microns in diameter. “The challenge is how we do the actuation at such scales—that is something we focus on today. We try to pave the way but there is much more to do,” Chi adds.

Science Advances, 2024. DOI: https://doi.org/10.1126/sciadv.adr8421

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Craving carbs? Blame an ancient gene.

Science / Tim Belzer / December 27, 2024

“This observation is concordant with the recent evidence of Neanderthal starch consumption, and perhaps the availability of cooked starch in archaic hominins made possible through the domestication of fire,” the researchers said in a study recently published in Science.

Out of eight genomes examined, multiple copies of AMY1 were found in two Eastern Neanderthal genomes, one from a Western Neanderthal, and one from a Denisovan. So why did these extra copies evolve? While the exact reason is still unknown, the team thinks that the gene itself was copy number variable, meaning the number of copies within a population can vary between individuals. This variation likely developed before humans diverged from Neanderthals and Denisovans.

With the grain

To the research team, it was inevitable that copies of AMY1 in individual genomes would increase as former hunter-gatherers established agricultural societies. Farming meant grains and other starch-rich foods, and the ability to adjust those meant carbs.

And the data here is consistent with that. The team “found a general trend where the AMY1 gene copy number is significantly higher among samples excavated from archaeologically agricultural contexts compared to those from hunter-gatherer contexts,” as they said in the same study.

In genomes from pre-agricultural individuals, there were already anywhere from four to eight copies of the gene. The variation is thought to have come from groups experimenting with food-processing techniques such as grinding wild grains into flour. AMY1 copy numbers grew pretty consistently from the pre-agricultural to post-agricultural period. Individuals from populations that were in the process of transitioning to agriculture (around 16,100 to 8,500 years ago) were found to have about similar numbers of AMY1 copies as hunter-gatherers at the time.

Individuals from after 8,500 years ago who lived in more established agricultural societies showed the most copies and therefore the most evidence of adaptation to eating diets high in carbs. Agriculture continued to advance, and the last 4,000 years have seen the most significant surge of AMY1 copy increases. Modern humans have anywhere from two to 15 copies.

Further research could help with understanding how genetic variation of AMY1 copy numbers influences starch metabolism, including conditions such as gluten allergy and celiac disease, and overall metabolic health.

Can we really blame AMY1 and amylase on our carb cravings? Partly. The number of AMY1 copies in a human genome determine not only the ability to metabolize starches, but will also influence how they taste to us, and may have given us a preference for them. Maybe we can finally ease up on demonizing bread.

Science, 2024. DOI: 10.1126/science.adn060

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Flu surges in Louisiana as health department barred from promoting flu shots

CDC, Covid, flu, health, Louisiana, Science, vaccination / Tim Belzer / December 23, 2024

The statement seemed to offer an assurance that other vaccines were not subject to the new restrictions. “Changes regarding seasonal vaccines like COVID and influenza do not change the Department’s policy or messaging regarding childhood immunizations,” it read.

This flu season, the health department has reportedly canceled standard vaccination events and clinics. On social media, the department has avoided mentioning flu shots in posts about the flu, instead advising people to wash their hands and cover their coughs.

While Louisiana is seeing an early surge in influenza, the rest of the country is on an upward trend in what appears to be a normal-looking season so far. Nationally, the percentage of doctor visits that were for ILIs is 3.8 percent, with the upswing in ILI activity similar to what was seen in the 2019–2020 flu season at this point in the year. At the peak of flu seasons, the percentage of visits for ILIs usually tops out around 7 percent to 8 percent.

US ILI activity charted by week across several flu seasons Credit: CDC

Two children died last week of flu, bringing the season’s total pediatric deaths to four. In the 2023–2024 season, 206 children died with influenza-associated disease. Most of the deaths occurred in early 2024.

COVID-19 is also ramping up a winter wave. While standard disease burden indicators—hospitalization and deaths—are low, they’re trending positive. Wastewater surveillance, meanwhile, is showing a steep incline, with levels of the virus being detected at “moderate” levels.

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Green sea turtle gets relief from “bubble butt” syndrome thanks to 3D printing

3D printing, green sea turtle, Science, Tech, wildlife / Paul Patrick / December 21, 2024

Two main reasons those gas pockets appear in turtles are plastics and boat strikes.

When a turtle consumes something it can’t digest—like parts of fishing nets, plastic bottles, or even rubber gloves (yes, there was a sea turtle found with a rubber glove in its intestines)—it sometimes gets stuck somewhere along its gastrointestinal tract. This, in turn, causes gases to gather there, which throws the turtle’s buoyancy out of balance.

Those gases usually gather in the parts of the gastrointestinal tract located near the rear of the turtle, so the animal is left floating bum-up at an unnatural angle. Conditions like that are sometimes curable with dietary modifications, assisted feeding, fluid therapy, and other non-invasive means to the point where afflicted animals can be safely released back into the wild. Boat strikes, on the other hand, often lead to permanent damage.

Sea turtles’ shells are tough but not tough enough to withstand a boat impact, especially when the shell gets hit by a propeller blade. This often leaves a shell deformed, with air bubbles trapped underneath it. In more severe cases, the spinal cord under the shell also gets damaged, which leads to complete or partial paralysis.“

The most popular approach to rehabilitating these injuries relies on gluing Velcro patches to the shell at carefully chosen spots and attaching weights to those patches to counteract the buoyancy caused by the air bubbles. This is a pretty labor-intensive task that has to be done repeatedly every few months for the rest of the turtle’s life. And green sea turtles can live as long as 80 years.

Charlotte swimming with the harness on. Credit: Laura Shubel

Harnessing advanced manufacturing

Charlotte, as a boat strike victim with air bubbles trapped under its deformed shell, was considered non-releasable and completely dependent on human care. Since full recovery was not an option, Mystic Aquarium wanted to make everyday functioning more bearable for both the turtle and its caretakers. It got in touch with Adia, which in turn got New Balance and Formlabs onboard. Their idea was to get rid of the Velcro and replace them with a harness fitted with slots for weights.

Green sea turtle gets relief from “bubble butt” syndrome thanks to 3D printing Read More »