Between 1400 and 1775, a significant upsurge in witch trials swept across early modern Europe, resulting in the execution of an estimated 40,000–60,000 accused witches. Historians and social scientists have long studied this period in hopes of learning more about how large-scale social changes occur. Some have pointed to the invention of the printing press and the publication of witch-hunting manuals—most notably the highly influential Malleus Maleficarum—as a major factor, making it easier for the witch-hunting hysteria to spread across the continent.

The abrupt emergence of the craze and its rapid spread, resulting in a pronounced shift in social behaviors—namely, the often brutal persecution of suspected witches—is consistent with a theory of social change dubbed "ideational diffusion," according to a new paper published in the journal Theory and Society. There is the introduction of new ideas, reinforced by social networks, that eventually take root and lead to widespread behavioral changes in a society.

The authors had already been thinking about cultural change and the driving forces by which it occurs, including social contagion—especially large cultural shifts like the Reformation and the Counter-Reformation, for example. One co-author, Steve Pfaff, a sociologist at Chapman University, was working on a project about witch trials in Scotland and was particularly interested in the role the Malleus Maleficarum might have played.

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Human beings live every day with the understanding of our own mortality, but do animals have any concept of death? It's a question that has long intrigued scientists, fueled by reports of ants, for example, appearing to attend their own"funerals"; chimps gathering somberly around fallen comrades; or a mother whale who carried her dead baby with her for two weeks in an apparent show of grief.

Philosopher Susana Monsó is a leading expert on animal cognition, behavior and ethics at the National Distance Education University (UNED) in Madrid, Spain. She became interested in the topic of how animals experience death several years ago while applying for a grant and noted that there were a number of field reports on how different animal species reacted to death. It's an emerging research field called comparative thanatology, which focuses on how animals react to the dead or dying, the physiological mechanisms that underlie such reactions, and what we can learn from those behaviors about animal minds.

"I could see that there was a new discipline that was emerging that was very much in need of a philosophical approach to help it clarify its main concepts," she told Ars. "And personally, I was turning 30 at the time and became a little bit obsessed with death.  So I wanted to think a lot about death and maybe come to fear it less through philosophical reflection on it."

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In June 1924, a British mountaineer named George Leigh Mallory and a young engineering student named Andrew "Sandy" Irvine set off for the summit of Mount Everest and disappeared—two more casualties of a peak that has claimed over 300 lives to date. Mallory's body was found in 1999, but Irvine's was never found—until now. An expedition led by National Geographic Explorer and professional climber Jimmy Chin—who won an Oscar for the 2019 documentary Free Solo, which he co-directed—has located a boot and a sock marked with Irvine's initials at a lower altitude than where Mallory's body had been found.

The team took a DNA sample from the remains, and members of the Irvine family have volunteered to compare DNA test results to confirm the identification. “It’s an object that belonged to him and has a bit of him in it,” Irvine’s great-niece Julie Summers told National Geographic. "It tells the whole story about what probably happened. I'm regarding it as something close to closure.”

As previously reported, Mallory is the man credited with uttering the famous line "because it's there" in response to a question about why he would risk his life repeatedly to summit Everest. Mallory had already been to the mountain twice before the 1924 expedition: once in 1921 as part of a reconnaissance expedition to produce the first accurate maps of the region and again in 1922. He was forced to turn back on all three attempts.

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Breakdancing has become a global phenomenon since it first emerged in the 1970s, even making its debut as an official event at this year's Summer Olympics. But hardcore breakers are prone to injury (sprains, strains, tendonitis), including a bizarre condition known as "headspin hole" or "breakdance bulge"—a protruding lump on the scalp caused by repeatedly performing the power move known as a headspin. A new paper published in the British Medical Journal (BMJ) describes one such case that required surgery to redress.

According to the authors, there are very few published papers about the phenomenon; they cite two in particular. A 2009 German study of 106 breakdancers found that 60.4 percent of them experienced overuse injuries to the scalp because of headspins, with 31.1 percent of those cases reporting hair loss, 23.6 percent developing head bumps, and 36.8 percent experiencing scalp inflammation. A 2023 study of 142 breakdancers reported those who practiced headspins more than three times a week were much more likely to suffer hair loss.

So when a male breakdancer in his early 30s sought treatment for a pronounced bump on top of his head, Mikkal Bundgaard Skotting and Christian Baastrup Søndergaard of Copenhagen University Hospital in Denmark seized the opportunity to describe the clinical case study in detail, taking an MRI, surgically removing the growth, and analyzing the removed mass.

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Over the last few years, Virginia Tech scientists have been looking to the octopus for inspiration to design technologies that can better grip a wide variety of objects in underwater environments. Their latest breakthrough is a special switchable adhesive modeled after the shape of the animal's suckers, according to a new paper published in the journal Advanced Science.

“I am fascinated with how an octopus in one moment can hold something strongly, then release it instantly. It does this underwater, on objects that are rough, curved, and irregular—that is quite a feat,” said co-author and research group leader Michael Bartlett. "We’re now closer than ever to replicating the incredible ability of an octopus to grip and manipulate objects with precision, opening up new possibilities for exploration and manipulation of wet or underwater environments.”

As previously reported, there are several examples in nature of efficient ways to latch onto objects in underwater environments, per the authors. Mussels, for instance, secrete adhesive proteins to attach themselves to wet surfaces, while frogs have uniquely structured toe pads that create capillary and hydrodynamic forces for adhesion. But cephalopods like the octopus have an added advantage: The adhesion supplied by their grippers can be quickly and easily reversed, so the creatures can adapt to changing conditions, attaching to wet and dry surfaces.

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A few years ago, Egyptian archaeologists discovered what they thought were the ruins of an ancient Egyptian temple dating back to the sixth century BCE. Subsequent finds at the site indicate that the structure was actually an astronomical observatory, deemed the first and largest such structure yet found, according to Egypt's Ministry of Tourism and Antiquities.

The L-shaped structure was found within a larger complex called the Temple of Buto (a later Greek name), known to the ancient Egyptians as Per-Wadjet and located east of Alexandria in the Nile Delta. It's now called Tell El Fara'in ("Hill of the Pharaohs"). Buto was once a sacred site dedicated to the goddess Wadjet, believed to be the matron and protector of lower Egypt, who took on a cobra form. Buto was well-known for its temple and the oracle of Wadjet, with an annual festival held there in her honor.

There were archaeological excavations of the site in the 1960s and 1980s, revealing a palace dating back to the Second Dynasty, as well as six Greek bathhouses. An Egyptian team began fresh excavations a few years ago. In 2022, they uncovered a hall at the southwestern end of the temple, with the remains of three papyrus-shaped columns aligned on a north-south axis. They also found  engraved stone fragments and a limestone painting of a bird's head wearing a white crown within two feathers.

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London's Great Exhibition of 1851 attracted some 6 million people eager to experience more than 14,000 exhibitors showcasing 19th-century marvels of technology and engineering. The event took place in the Crystal Palace, a 990,000-square-foot building of cast iron and plate glass originally located in Hyde Park. And it was built in an incredible 190 days. According to a recent paper published in the International Journal for the History of Engineering and Technology, one of the secrets was the use of a standardized screw thread, first proposed 10 years before its construction, although the thread did not officially become the British standard until 1905.

“During the Victorian era there was incredible innovation from workshops right across Britain that was helping to change the world," said co-author John Gardner of Anglia Ruskin University (ARU). "In fact, progress was happening at such a rate that certain breakthroughs were perhaps never properly realized at the time, as was the case here with the Crystal Palace. Standardization in engineering is essential and commonplace in the 21st century, but its role in the construction of the Crystal Palace was a major development."

The design competition for what would become the Crystal Palace was launched in March 1850, with a deadline four weeks later, and the actual, fully constructed building opened on May 1, 1851. The winning design, by Joseph Paxton, wasn't chosen until quite late in the game after numerous designs had been rejected—most because they were simply too far above the 100,000-pound budget.

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In 2014, researchers monitoring acoustic recordings from the Mariana Archipelago picked up an unusual whale vocalization with both low- and high-frequency components. It seemed to be a whale call, but it sounded more mechanical than biological and has since been dubbed a "biotwang."

Now a separate team of scientists has developed a machine-learning model to scan a dataset of recordings of whale vocalizations from various species to help identify the source of such calls. Combining that analysis with visual observations allowed the team to identify the source of the biotwang: a species of baleen whales called Bryde's (pronounced "broodus") whales. This should help researchers track populations of these whales as they migrate to different parts of the world, according to a recent paper published in the journal Frontiers in Marine Science.

Marine biologists often rely on a powerful tool called passive acoustic monitoring for long-term data collection of the ocean's acoustic environment, including whale vocalizations. Bryde's whale calls tend to be regionally specific, per the authors. For instance, calls in the eastern North Pacific are pretty well documented, with frequencies typically falling below 100 Hz, augmented by harmonic frequencies as high as 400 Hz. Far less is known about the sounds made by Bryde's whales in the western and central North Pacific, since for many years there were only three known recordings of those vocalizations—including a call dubbed "Be8" (starting at 45 Hz with multiple harmonics) and mother-calf calls.

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Recently, chemists at Binghamton University learned that many tattoo inks in the US contain different pigments than those listed, or unlisted additives. One might expect the European Union, with its stricter regulations, to have fewer issues on that score, but according to a new paper published in the journal Analyst, that's not the case, particularly for green and blue tattoo inks. Most had components that were not listed on the label, and some included banned ingredients.

"Our work cannot say anything about the safety of tattoos, but we think it's an important first step in addressing the question 'Are tattoos safe?'" said co-author John Swierk, a chemist at Binghamton University. "If we don't know what's in a bottle of tattoo ink, then we cannot figure out what might be causing an adverse event in the near and long term, whether that’s an allergic reaction or something more serious. As a team, we aren't anti-tattoo, we just believe that clients and artists have a right to know what's in the inks they are using."

As previously reported, typical tattoo ink contains one or more pigments (which give the ink its color) within a "carrier package" to help deliver the pigments into the skin. The pigments are the same as those used in paints and textiles. They can be either small bits of solids or discrete molecules, such as titanium dioxide or iron oxide (for white or rust-brown colors, respectively). As for the carrier packages, most ink manufacturers use grain or rubbing alcohol, sometimes with a bit of witch hazel added to the mix to help the skin heal after the tattooing process. There may also be other additives to adjust the viscosity and keep pigment particles suspended in the carrier package.

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In 2014, researchers monitoring acoustic recordings from the Mariana Archipelago picked up an unusual whale vocalization with both low- and high-frequency components. It seemed to be a whale call, but it sounded more mechanical than biological and has since been dubbed a "biotwang."

Now a separate team of scientists has developed a machine-learning model to scan a dataset of recordings of whale vocalizations from various species to help identify the source of such calls. Combining that analysis with visual observations allowed the team to identify the source of the biotwang: a species of baleen whales called Bryde's (pronounced "broodus") whales. This should help researchers track populations of these whales as they migrate to different parts of the world, according to a recent paper published in the journal Frontiers in Marine Science.

Marine biologists often rely on a powerful tool called passive acoustic monitoring for long-term data collection of the ocean's acoustic environment, including whale vocalizations. Bryde's whale calls tend to be regionally specific, per the authors. For instance, calls in the eastern North Pacific are pretty well documented, with frequencies typically falling below 100 Hz, augmented by harmonic frequencies as high as 400 Hz. Far less is known about the sounds made by Bryde's whales in the western and central North Pacific, since for many years there were only three known recordings of those vocalizations—including a call dubbed "Be8" (starting at 45 Hz with multiple harmonics) and mother-calf calls.

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Recently, chemists at Binghamton University learned that many tattoo inks in the US contain different pigments than those listed, or unlisted additives. One might expect the European Union, with its stricter regulations, to have fewer issues on that score, but according to a new paper published in the journal Analyst, that's not the case, particularly for green and blue tattoo inks. Most had components that were not listed on the label, and some included banned ingredients.

"Our work cannot say anything about the safety of tattoos, but we think it's an important first step in addressing the question 'Are tattoos safe?'" said co-author John Swierk, a chemist at Binghamton University. "If we don't know what's in a bottle of tattoo ink, then we cannot figure out what might be causing an adverse event in the near and long term, whether that’s an allergic reaction or something more serious. As a team, we aren't anti-tattoo, we just believe that clients and artists have a right to know what's in the inks they are using."

As previously reported, typical tattoo ink contains one or more pigments (which give the ink its color) within a "carrier package" to help deliver the pigments into the skin. The pigments are the same as those used in paints and textiles. They can be either small bits of solids or discrete molecules, such as titanium dioxide or iron oxide (for white or rust-brown colors, respectively). As for the carrier packages, most ink manufacturers use grain or rubbing alcohol, sometimes with a bit of witch hazel added to the mix to help the skin heal after the tattooing process. There may also be other additives to adjust the viscosity and keep pigment particles suspended in the carrier package.

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Our feline overlords aren't particularly known for obeying commands from mere humans, which can make it difficult to study their behaviors in controlled laboratory settings. So a certain degree of ingenuity is required to get usable results—like crocheting adorable little hats for kitties taking part in electroencephalogram (EEG) experiments. That's what researchers at the University of Montreal in Quebec, Canada, did to learn more about assessing chronic pain in cats—and they succeeded. According to their recent paper published in the Journal of Neuroscience Methods, it's the first time scientists have recorded the electrical activity in the brains of conscious cats.

According to the authors, one-quarter of adult cats suffer from osteoarthritis and chronic pain that worsens with age. There are currently limited treatment options, namely, non-steroidal anti-inflammatory drugs, which can have significant side effects for the cats. An injectable monoclonal antibody tailored for cats has recently been developed to neutralize excessive nerve growth factor, but other alternative treatment options like supplements and regenerative medicine have yet to be tested. Nor has the effectiveness of certain smells or lighting in altering pain perception in felines been tested.

That was the Montreal team's primary objective for their experiments. Initially, they tried to place electrodes on the heads of 11 awake adult cats with osteoarthritis, but the cats kept shaking off the electrodes.

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Scientists at the University of Washington have re-created the distinctive spiral shapes of shark intestines in 3D-printed pipes in order to study the unique fluid flow inside the spirals. Their prototypes kept fluids flowing in one preferred direction with no need for flaps to control that flow and performed significantly better than so-called "Tesla valves," particularly when made of soft polymers, according to a new paper published in the Proceedings of the National Academy of Sciences.

As we've reported previously, in 1920, Serbian-born inventor Nikola Tesla designed and patented what he called a "valvular conduit": a pipe whose internal design ensures that fluid will flow in one preferred direction, with no need for moving parts, making it ideal for microfluidics applications, among other uses. The key to Tesla's ingenious valve design is a set of interconnected, asymmetric, tear-shaped loops.

In his patent application, Tesla described this series of 11 flow-control segments as being made of "enlargements, recessions, projections, baffles, or buckets which, while offering virtually no resistance to the passage of fluid in one direction, other than surface friction, constitute an almost impassable barrier to its flow in the opposite direction." And because it achieves this with no moving parts, a Tesla valve is much more resistant to the wear and tear of frequent operation.

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Enlarge / Physicist Martin Bier in an aerodynamic tuck, a cycling position that reduces wind resistance. (credit: Martin Bier)

Many avid bicyclists these days have hopped onto the "everesting" bandwagon, in which one rides up and down the same mountain route over and over until the total distance of one's ascents matches the elevation of Mount Everest: 8,848 meters or about 5.5 miles. Recently there has been debate over whether a strong tailwind could help a rider improve their time. But apparently that's not the case, according to a new paper published in the American Journal of Physics by physicist Martin Bier of East Carolina University in North Carolina.

The term "everesting" takes its name from George Mallory, grandson of the legendary 1920s mountaineer George Mallory who participated in the first three British Everest expeditions. Mallory the younger was prepping for his Everest attempt in 1994, and his training included weekend workouts involving bicycling up Mount Donna Buang in Australia many times until he had achieved the elevation of Mount Everest.

Twenty years later, another Australian cycling enthusiast, Andy van Bergen, started organizing worldwide "everesting" events. Participating cyclists would pick a hill near their homes and track each other's progress online. The events became extremely popular in 2020 after the outbreak of the COVID-19 pandemic sparked global lockdowns.

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Enlarge / The Globe of Science and Innovation at CERN (credit: Adam Nieman/CC BY-SA 2.0)

Since its founding in 1954, high-energy physics laboratory CERN has been a flagship for international scientific collaboration. That commitment has been under strain since the Russian invasion of Ukraine in 2022. CERN decided to cut ties with Moscow late last year over deaths resulting from the country's "unlawful use of force" in the ongoing conflict.

With the existing international cooperation agreements now lapsing, the Geneva-based organization is expected to expel hundreds of scientists on November 30 affiliated with Russian institutions, Nature reports. However, CERN will maintain its links with the Joint Institute for Nuclear Research (JINR), an intergovernmental center near Moscow.

CERN was founded in the wake of World War II as a place dedicated to the peaceful pursuit of science. The organization currently has 24 member states and, in 2019 alone, hosted about 12,400 users from institutions in more than 70 countries. Russia has never been a full member of CERN, but collaborations first began in 1955, with hundreds of Russia-affiliated scientists contributing to experiments in the ensuing decades. Now, that 60-year history of collaboration, and Russia's long-standing observer status, is ending. As World Nuclear News reported earlier this year:

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Enlarge / Math for English Majors talks about numbers as nouns, verbs as calculations, and algebra as grammar. (credit: Ben Orlin)

Galileo once famously described the universe as a great book "written in mathematical language and its characters are triangles, circles, and other geometrical figures." Unfortunately, it's a language that many people outside of math and science simply do not speak, largely because they are flummoxed and/or intimidated by the sheer density of all that strange symbolic notation.

Math teacher extraordinaire Ben Orlin is here to help with his latest book: Math for English Majors: A Human Take on the Universal Language. And just like Orlin's previous outings, it's filled with the author's trademark bad drawings. Bonus: Orlin created a fun personality quiz, which you can take here to find out your mathematical style.

Orlin's first book, Math with Bad Drawings, after his blog of the same name, was published in 2018. It included such highlights as placing a discussion of the correlation coefficient and "Anscombe's Quartet" into the world of Harry Potter and arguing that building the Death Star in the shape of a sphere may not have been the Galactic Empire's wisest move. We declared it "a great, entertaining read for neophytes and math fans alike, because Orlin excels at finding novel ways to connect the math to real-world problems—or in the case of the Death Star, to problems in fictional worlds."

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Enlarge / Many have seen a reflection of Vincent van Gogh's inner turmoil in the swirling vortices of The Starry Night. (credit: Public doman)

Vincent van Gogh's most famous painting is The Starry Night (1889), created (along with several other masterpieces) during the artist's stay at an asylum in Arles following his breakdown in December 1888. Where some have seen the swirling vortices of the night sky depicted in Starry Night as a reflection of van Gogh's own inner turmoil, physicists often see a masterful depiction of atmospheric turbulence. According to a new paper published in the journal Physics of Fluids, the illusion of movement in van Gogh's blue sky is also due to the scale of the paint strokes—a second kind of "hidden turbulence" at the microscale that diffuses throughout the entire canvas.

“It reveals a deep and intuitive understanding of natural phenomena,” said co-author Yongxiang Huang of Xiamen University in China. “Van Gogh’s precise representation of turbulence might be from studying the movement of clouds and the atmosphere or an innate sense of how to capture the dynamism of the sky.”

Physicists have long been fascinated by van Gogh's innate feel for turbulence. As previously reported, in a 2014 TED-Ed talk, Natalya St. Clair, a research associate at the Concord Consortium and coauthor of The Art of Mental Calculation, used Starry Night to illuminate the concept of turbulence in a flowing fluid. In particular, she talked about how van Gogh's technique allowed him (and other Impressionist painters) to represent the movement of light across water or in the twinkling of stars. We see this as a kind of shimmering effect, because the eye is more sensitive to changes in the intensity of light (a property called luminance) than to changes in color.

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Enlarge / The Fifty-Eight holes board from Çapmalı. (credit: W. Crist et al., 2024)

An ancient board game known as Hounds and Jackals has long been believed to have originated in Egypt. However, according to a paper published in the European Journal of Archaeology, a version of the game board found in present-day Azerbaijan might date back even earlier, suggesting that the game originated in Asia.

As previously reported, there is archaeological evidence for various kinds of board games from all over the world dating back millennia: Senet and Mehen in ancient Egypt, for example, or a strategy game called ludus latrunculorum ("game of mercenaries") favored by Roman legions. A 4,000-year-old board discovered last year at an archaeological site in Oman's Qumayrah Valley might be a precursor to an ancient Middle Eastern game known as the Royal Game of Ur (or the Game of Twenty Squares), a two-player game that may have been one of the precursors to backgammon (or was replaced in popularity by backgammon). Like backgammon, it's essentially a race game in which players compete to see who can move all their pieces along the board before their opponent.

Last year, archaeologists discovered a 500-year-old game board in the ruins of Ćmielów Castle in Poland. It was a two-person strategy board game called Mill, also known as Nine Men's Morris, Merels, or "cowboy checkers" in North America. The earliest-known Mill game board was found carved into the roofing slabs of an Egyptian temple at Kurna, which likely predates the Common Era. Historians believe it was well-known to the Romans, who may have learned of the game through trade routes.

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Enlarge / The Ig Nobel Prizes honor "achievements that first make people laugh and then make them think." (credit: Aurich Lawson / Getty Images)

Curiosity is the driving force behind all science, which may explain why so many scientists sometimes find themselves going in some decidedly eccentric research directions. Did you hear about the WWII plan to train pigeons as missile guidance systems? How about experiments on the swimming ability of a dead rainbow trout or that time biologists tried to startle cows by popping paper bags by their heads? These and other unusual research endeavors were honored tonight in a virtual ceremony to announce the 2024 recipients of the annual Ig Nobel Prizes. Yes, it's that time of year again, when the serious and the silly converge—for science.

Established in 1991, the Ig Nobels are a good-natured parody of the Nobel Prizes; they honor "achievements that first make people laugh and then make them think." The unapologetically campy awards ceremony features miniature operas, scientific demos, and the 24/7 lectures whereby experts must explain their work twice: once in 24 seconds and the second in just seven words. Acceptance speeches are limited to 60 seconds. And as the motto implies, the research being honored might seem ridiculous at first glance, but that doesn't mean it's devoid of scientific merit.

Viewers can tune in for the usual 24/7 lectures, as well as the premiere of a "non-opera" featuring various songs about water, in keeping with the evening's theme. In the weeks following the ceremony, the winners will also give free public talks, which will be posted on the Improbable Research website.

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