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Facebook is the most used social media platform in Western markets (not including YouTube, which may host user-generated content but is not typically considered in the same category). Yet, the broad consensus, from competitors to Gen Z, is that the platform is ‘dead’. Why?

Notably, it is most prominently used by older demographics. Facebook is by far the most popular platform among over 35s, with roughly ¾s of them using the platform weekly. However, for 20-24s, Instagram and TikTok are more popular and fewer than a third of 16-19s use Facebook weekly. In other words, Facebook going ‘mainstream’ did not just mean it became the most used overall, it meant most used by consumers who are of parent-age and older.

For this sizable group, Facebook is not dead. It is still where they like one another’s posts, share photos of their Elfs on the Shelf, and participate in local community groups. For younger users, however, the app mainly constitutes family photos from their older relatives, ad after promoted content after ad, and re-shared content from platforms like Reddit, X, and Instagram.

Instagram, on the other hand, is still prominently used by younger demographics. It competes neck-and-neck with TikTok for under-25s, surpassing it slightly for 25-34s, with both apps dipping back down for over-35s. So, the signs were already there that Instagram was going culturally ‘mainstream’ as its initial user base — millennials — began to age.

As if on cue, there has been a notable shift over the past several weeks: the feed (anecdotally, from a casual survey of latter-20s women) is starting to look a lot like Facebook’s. There is very little social content; people are posting less often, and if so it is mainly the grandma-safe life events and arty highlights from a roll of film shot six months ago. The app is a hub for memes and news, but many are reposted from other sites and platforms, and ads overpower everything else.

As with Facebook, the use is still high for scrolling – but meaningful interpersonal connection is fading for many original users, and the attention by cultural ‘trend setters’ has all but jumped off a cliff.

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In reaction to—or protest over—the impending U.S. TikTok ban, which will take effect on Sunday if the app is not sold or if the Supreme Court doesn’t intervene, thousands of people in the country have joined RedNote. The latter is a China-based e-commerce and lifestyle app that is also known as Xiaohongshu, Mandarin for “Little Red Book”—which is also a nickname for the famous book of quotations from Mao Zedong. About 300 million people, mainly in China, use RedNote for video and image sharing, shopping, and travel recommendations.

This week RedNote climbed to the top of the charts on Apple’s and Google’s U.S. app stores. The potential TikTok ban has so far prompted about 700,000 people to join the Chinese app, according to Reuters. That’s less than 1 percent of the 170 million U.S. users of TikTok, but the influx has been enough to spawn goofy memes and the occasional misunderstanding: a man in Vancouver who welcomed the new arrivals went viral because people mistook him for RedNote’s chief executive.

The rush to this app is an example of the “media substitution hypothesis,” in which people fill a media void with a new platform or network, says Saleem Alhabash, a professor of advertising and public relations at Michigan State University, who studies the psychological effects of social media use. On TikTok, “there is no implicit contract that you have to be an active user,” he points out, unlike arguably more posting-driven platforms such as X (formerly Twitter), Bluesky or Instagram. It’s completely acceptable to passively lurk, scroll, and shop on TikTok, and RedNote may be scratching that same itch. “Mix the social with satisfying the need to shop—to buy cheap clothes or exercise equipment—that is the full package, in terms of user experience,” Alhabash says.

Although TikTok owner ByteDance is based in China, the English version of its app operates in the U.S. through an American subsidiary. RedNote, meanwhile, has a single app with mostly Mandarin content and is headquartered in Shanghai. One result of the recent migration has been a cultural exchange between new users in the U.S. and veteran ones in China: Some Americans on RedNote, for instance, marveled at China’s mass-market electric cars, which aren’t sold in the U.S. because of high tariffs. And Chinese students have sought help with their English homework on the app.

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During their prime, the Vikings mastered the seas and went on to make wide-spanning voyages by boat. But how exactly did they know where they were going? A recent study, focused on a set of medieval stone disks found in Ukraine, supports the belief that Viking sailors used solar compasses to navigate and may have passed on this knowledge to other populations in Europe. 

The appraisal of the eight stone disks was featured in a December 2024 paper published in Sprawozdania Archeologiczne, a Polish archeological journal. The study’s authors contend that some of the disks display key features that would have used the sun to operate as a compass, sharing similarities with other Viking artifacts originating from Greenland and Poland.

Identifying the Medieval Disks

The disks, found in several medieval-era archaeological sites in Ukraine, were originally crafted from pyrophyllite, a soft and easy-to-process mineral used for many industrial purposes during the period.

The researchers concentrated on three of the disks that already had detailed descriptions: two from the northern Chernihiv region (referred to as Listven and Liubech) and one from nearby Kyiv. The disks were dated from the 12th and 13th centuries, and they were most likely local products made in workshops near the city of Ovruch. 

Previous interpretations of these objects have ranged from calendars to needle-sharpening devices, but the new study proposes that they were instead used as navigational tools. 

One reason for this is the disks’ design, with the Kyiv and Listven disks featuring a central hole that could hold the gnomon — the pointy component of a sundial that casts a shadow when hit with sunlight. This would help determine latitude in the case of a compass. In addition, concentric rings and radial lines were carved into the three disks, further demonstrating the semblance of a compass.

Similarities Among Viking Solar Compasses

The researchers compared the pyrophyllite disks with other artifacts that have been identified as navigational instruments used by Vikings. Of particular importance are wooden disks, including one from Greenland found in 1948 and one from the Polish island of Wolin found in 2000. These wooden disks contained elements characteristic of sundial-compasses, such as a hole for a gnomon and perimeter notches. 

The wooden disks and the pyrophyllite disks share several features, including certain markings. The Wolin disk, dated to the end of the first half of the 11th century, has concentric rings similar to the pyrophyllite disks. However, the Greenland disk, dated to around the start of the 11th century, does not have concentric rings. The researchers suggest that this could mean concentric rings were not present in early Viking solar compasses but developed in later versions. 

All of the disks were also similar sizes — the Greenland and Wolin disks were measured at 7 cm and 8.6 cm in diameter respectively; the Kyiv and Listven disks were both 6.5 cm in diameter, while the Liubech disk measured 7.5 cm. 

Although additional investigations are needed to confirm the role of the pyrophyllite disks, the researchers say it is possible that Vikings who traveled through what is now Russia and Ukraine during medieval times (known as Varangians) could have imparted technological knowledge that allowed locals to create the solar compasses.

Varangian travelers would have passed by Kyiv, Listven, and Liubech on their journeys along a major trade route connecting Scandinavia with the Eastern Roman Empire, making the spread of Viking-inspired solar compass technology in the region a real possibility.

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CLIMATEWIRE | More than 50,000 scientists and their supporters have signed an open letter asking Congress to safeguard federal research and scientific jobs ahead of the incoming Trump administration.

The Union of Concerned Scientists, a nonprofit science advocacy organization, spearheaded and published the letter Monday morning. The document points to concerns that President-elect Donald Trump may eliminate or reorganize federal science agencies, reduce staff, and attack regulations aimed at protecting public health and the environment.

“The Trump administration’s current agenda promises to eviscerate the protections that Americans count on and support: clean air and water; safe food and medicine; products that won’t harm us; and protection from extreme weather and other damaging effects of climate change,” the letter stated. “Without strong federal science, people will suffer, and historically marginalized communities will continue to bear the burden of these harms.”

The letter also asked members of Congress to “oppose anti-science nominees to any federal agency who do not agree on the record to follow and/or implement a scientific integrity policy in their agency.”

Also on Monday, 28 organizations submitted a letter to members of the Senate asking them to vote against political nominees who don’t have appropriate qualifications, exhibit conflicts of interest, fail to recognize the scientific consensus on issues relevant to the agency, or have a record of disregarding scientific integrity.

Signers included public health and medical associations, environmental organizations, and science advocacy groups, the Union of Concerned Scientists among them.

“The decisions you make about nominees will determine whether agencies use the substantial scientific expertise of government employees and advisors to safeguard public health and economic stability, or whether bias and misinformation block effective responses,” the letter said.

Trump was “re-elected by a resounding mandate from the American people to change the status quo in Washington,” said Karoline Leavitt, a spokesperson for the Trump transition, in an email to POLITICO’s E&E News. “That’s why he has chosen brilliant and highly-respected outsiders to serve in his Administration, and he will continue to stand behind them as they fight against all those who seek to derail the MAGA Agenda.”

The letters reflect a growing anxiety among scientists and science advocates about the future of federal research under Trump. Experts have raised concerns that the incoming administration may downsize federal agencies, shift or curtail their research priorities, censor scientists and alter or destroy federal datasets.

Trump has consistently disavowed the seriousness of climate change and pledged to withdraw the U.S. from the Paris Agreement for a second time. He’s also recently tapped a number of political nominees known for denying mainstream science on subjects related to public health and the environment.

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Scribes and surgeons, thieves and theologians, philosophers and pallbearers. Here’s what they all have—patron saints. Knotmakers have no saints. There is, however, Our Lady Undoer of Knots—Mary, serenely unkinking a long ribbon while stomping on a knotted serpent. Here’s St. Irenaeus of Lyons, a second-century Christian theologian: “The knot of disobedience of the first woman, Eve, was undone by the obedience of Mary; the knot the virgin Eve had created was undone by the Virgin Mary through her faith.” 

Might the tying and the untying be parts of the same whole? A couple thousand years earlier in ancient Egypt, the goddess Isis seemed to be saying so—the one who weaves it is also the one who unweaves the 𓎬 tyet.  The knot itself is endless. Da Vinci knew that, as did Dürer. Not Alexander, though.

I’ve been skimming The Ashley Book of Knots, a charmingly eccentric 1944 volume by sailor and artist Clifford W. Ashley. “I hobnobbed with butchers and steeple jacks, cobblers and truck drivers, electric linesmen, Boy Scouts, and with elderly ladies who knit.” A massive “adventure in unlimited space” with 7,000 illustrations, it is spoken of with near-religious fervor by knotmakers. “In Boston, I halted an operation to see how the surgeon made fast his stitches. I have watched oxen slung for the shoeing, I have helped throw pack lashings, I have followed tree surgeons through their acrobatics, and examined poachers’ traps and snares. But I never saw Houdini,” Ashley goes on to confess. 

This public domain copy has no cover, and so I’ve downloaded the original cover image by George Giguere. Against an opalescent sky and an algal sea, an old, weathered sailor sits on a cask with a (mandatory) pipe clenched in his (mandatory) square jaw. He’s showing us the Tom Fool knot, also known as the conjuror’s knot. Now that’s an old knot. Heraklas, the Greek physician, called this knot epankylotos brokhos—the interlooped noose—in his list of surgical nooses and knots in the first century AD. Our sailor looks pleased he knows his history.

Philippe Petit, legendary highwire artist and star of the Oscar-winning Man on Wire says, “If at first you don’t succeed, tie, tie again.” A card-carrying member of the International Guild of Knot Tyers, the man does know a thing or two about knotsmanship. An ill-made knot on the wire could mean he may not go home that day.

My own stakes are much lower. I’m just learning how to make knots. I’ve got heavy-knit cotton cords in ivory and crimson that I keep in a pouch. Using two colors helps me tell the twists and turns apart. I’ve also got an app called Grog Knots made by Alan Grogono—anesthesiologist, sailor, and curious knotter. (“Alan planned a career as an engineer or a comedian but father wisely interceded on the basis that a medical career would allow both. He was right!”) 

I should be starting with the basics but I’m constantly distracted by more glamorous knots with names like Turk’s Head or Monkey’s Fist. Or Windy Chien’s Dune Creature, a Heaving Line sandworm that reminds me of the exploding palm leaf snakes I made as a kid. I’ll keep at it. Just like in writing, I enjoy working with shape and form, gesture and constraint. As Nick Cave says in The Red Hand Files, “What it takes for me to pursue these freedoms—to feel genuinely free—has paradoxically something to do with order and constraint. . . . Freedom finds itself in captivity.” And someday I’ll get good at this wonderful thing.

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Firefighters in southern California are battling the Palisades and Eaton Fires, which have killed at least 25 people, burning a cumulative 37,700 acres and at least 12,000 structures. The plumes of smoke are even visible from space.

Residents of many fire-prone areas—as well as those far downwind—have grown familiar with the orange, apocalyptic haze of wildfire smoke as these blazes have become more common because of climate change. Such smoke can contain an unpredictable cocktail of chemicals associated with heart and lung diseases and even cancer, which is the leading cause of death among firefighters. Here’s what makes wildfire smoke so dangerous.

No Ordinary Pollutant

When trees, shrubbery, and other organic matter burn, they release carbon dioxide, water, heat—and, depending on the available fuel, various volatile compounds, gaseous pollutants, and particulate matter. Those tiny particles, which become suspended in the air, can include soot (black carbon), metals, dust, and more. If they’re smaller than 2.5 microns in diameter, they can evade our body’s natural defenses when inhaled, penetrating deep into the lungs and triggering a wide variety of health problems.

Such fine particulate matter is a common pollutant; it’s also created by motor vehicles and industrial plants, for example. But the kind present in wildfire smoke might be even more dangerous. Researchers studying health outcomes in southern California concluded that exposure to particular matter smaller than 2.5 microns, called PM_2.5, from wildfires was up to 10 times more harmful to human health compared with exposure to PM_2.5 from other sources. The researchers estimated that wildfire-generated particulate matter was three to four times more toxic—but they don’t yet know why.

More Dangerous Fuel

As humans develop ever more land, we grow the number of points of contact between human settlements and increasingly flammable forests. This makes it more likely that an errant, human-caused spark will ignite a blaze—and that the resulting wildfire will consume homes, offices, cars, and other human-made infrastructure, expanding the types and amounts of toxic compounds going up in the smoke. Paints, sealants, insulations, metals, and more can release many kinds of volatile organic compounds, gaseous pollutants and particulate matter.

A 2023 study by researchers at the Environmental Protection Agency found that emission factors for some toxic compounds were more than 1,000 times higher in urban wildfires than in fires that burned in woodland areas.

Unpredictable Chemistry

It’s surprisingly hard to predict what compounds someone is exposed to when they inhale wildfire smoke. What’s in the smoke depends on a few factors: what was burned (a ponderosa pine, for example, or a car), the temperature at which it burned (was it flaming or smoldering?), and how far and for how long the smoke has traveled. As the smoke ages, it is exposed to sunlight. This radiation can hit nitrogen oxides (NO_x) and volatile organic compounds (VOCs), setting off a complex set of reactions that usually results in another secondary pollutant: ozone, the main component of smog, which can damage the lungs.

And as smoke containing VOCs travels and settles over other cities, it can mix with even more local pollution in the form of NO_x—giving it the opportunity to form a larger amount of ozone. Research also suggests that VOCs and particulate matter—each of which can be toxic—can combine to make their respective health risks even worse.

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Archaeologists have excavated an intricately carved and painted tomb in northern Egypt, and they think the 4,100-year-old burial chamber belonged to a prominent, multi-talented royal doctor: a physician who served ancient Egyptian kings as an expert in medicinal plants, dentistry and venomous bites.

A team of French and Swiss researchers discovered the tomb in Saqqara, the necropolis of the ancient capital city of Memphis, according to a statement from Egypt’s Ministry of Tourism and Antiquities.

“This incredible find adds to Saqqara’s rich legacy as one of Egypt’s most significant archaeological sites,” writes the ministry. “The tomb is adorned with stunning carvings and vibrant artwork, including a beautifully painted false door and scenes of funerary offerings.”

Inside the tomb, researchers found a stone sarcophagus bearing the name “Tetinebefou” in hieroglyphics. The inscriptions also indicate that he was the chief palace physician, priest, chief dentist, director of medicinal plants and conjurer of the goddess Serket—an Egyptian deity known for curing venomous snake and scorpion bites.

The doctor may have served under Pepi II, a pharaoh of ancient Egypt’s Old Kingdom around the 23rd century B.C.E. He was crowned as a child and retained the throne for 60 to 90 years. When he died, he too was buried in Saqqara, entombed in a pyramid.

The Saqqara necropolis has been extensively looted over the millennia, according to a translated blog post from the researchers. They found only small fragments of funerary materials, but the painted walls alone made the discovery “exceptional.” As Live Science’s Owen Jarus reports, the paintings actually depict objects that the doctor might have used, such as jars and vases.

The doctor’s title of “conjurer of the goddess Serket” means he was “a specialist in poisonous bites,” as research team leader Philippe Collombert, an Egyptologist at the University of Geneva, tells Live Science. The other titles on the sarcophagus are quite rare: “Director of medicinal plants” has only been found on one other ancient Egyptian artifact, and “chief dentist” is also very unusual, Collombert says.

“Evidence for ancient Egyptian ‘dentists’ is exceedingly scarce,” as Roger Forshaw, an Egyptologist at the University of Manchester who wasn’t involved in the research, tells Live Science.

The ancient Egyptians are known for their advances in medical science, and they possessed extensive knowledge of human anatomy. Thousands of years ago, they were treating brain cancer via surgery, diagnosing the condition now known as diabetes, and building prosthetics.

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The tomb’s walls are painted and carved with images of objects the doctor might have used. Franco-Swiss Archaeological Mission of Saqqara

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Theoretical physicists have proposed the existence of a new type of particle that doesn’t fit into the conventional classifications of fermions and bosons. Their ‘paraparticle’, described in Nature on January 8, is not the first to be suggested, but the detailed mathematical model characterizing it could lead to experiments in which it is created using a quantum computer. The research also suggests that undiscovered elementary paraparticles might exist in nature.

In a separate development published late last year in Science, physicists experimentally demonstrated another kind of particle that is neither a boson nor a fermion — an ‘anyon’ — in a virtual one-dimensional universe for the first time. Anyons had previously been created only in 2D systems.

Because of their unusual behaviour, both paraparticles and anyons could one day play a part in making quantum computers less error-prone.

Particle properties

Around the time when physicists began to understand the structure of atoms, a century ago, Austrian-born theorist Wolfgang Pauli suggested that no two electrons can occupy the same state — and that if two electrons are pushed close to being in the same state, a repulsive force arises between them. This ‘Pauli exclusion principle’ is crucial to the way electrons orbiting an atomic nucleus arrange themselves in shells, instead of all falling to the lowest possible energy state.

Pauli and others soon realized that this empirical rule of exclusion applied not only to electrons but to a broader class of particles, including protons and neutrons, which they called fermions. Conversely, particles that do like to share the same state — which include the photons in a laser beam, for example — became known as bosons. (Pauli and his collaborators also worked out why being a fermion or a boson appeared to relate to a particle’s intrinsic angular momentum, or ‘spin’.)

Mathematically, the fundamental property of fermions is that when two of them switch positions, the ‘wavefunction’ that represents their collective quantum state changes sign, meaning that it gets multiplied by –1. For bosons, the wavefunction remains unaltered. Early quantum theorists knew that, in principle, there could be other kinds of particle whose wavefunctions changed in more complicated ways when they swapped positions. In the 1970s, researchers discovered anyons, which can exist only in universes of one or two dimensions.

Physicists Zhiyuan Wang, now at the Max Planck Institute for Quantum Optics in Garching, Germany, and Kaden Hazzard at Rice University in Houston, Texas, have now constructed a model for paraparticles that can exist in any number of dimensions — and with properties that are different from those of either fermions or bosons. In particular, these paraparticles obey their own type of Pauli exclusion. “It’s not entirely surprising that it’s possible,” says Kasia Rejzner, a mathematical physicist at the University of York, UK. “But it’s still cool.”

Wang says he came up with the exotic swapping rules by chance in 2021 while doing his PhD. “It was the most exciting moment in my life,” he says. Wang adds that it should be possible — although challenging — to realize these paraparticle states on a quantum computer.

1D anyons

Paraparticles share a property with fermions: swapping two particles and then swapping them back restores them to their original state. Anyons generally have a different quantum state even after being restored to their original positions, so they are not classed as paraparticles.

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It was well before dawn when I set off on foot through Granada’s oldest neighborhood, El Albaicín, an intricate brocade of cobbled streets overhung with fragrant jasmine trees. The first glow of sunlight revealed the titanic walls and turrets of the palace-fortress complex called the Alhambra looming above me on a spectacular crag. Poets have rhapsodized about the structure’s fairytale beauty since the finest craftsmen of the Arab world built it nearly 800 years ago. For over two centuries in the Middle Ages, it was the crown jewel of the Emirate of Granada, which stretched across Spain’s Mediterranean coast from modern-day Gibraltar past the snowcapped Sierra Nevada.

After crossing a stone bridge over the River Darro, I took a little-known back route into the palace called Cuesta del Rey Chico, a steep foot trail squeezed into a leafy ravine where the only sound was the water cascading from antique terra-cotta pipes. By now, the morning sunlight was making the Alhambra live up to its original name, al-Qal’ah al-Hamra, “the red fort.” An ornate archway led into the complex itself, an array of palaces and gardens covering 35 acres. The most famous site is the Nasrid Palace, named after the ruling dynasty. On my first visit, I had hardly known where to rest my eyes as I wandered its gorgeous chambers adorned with latticework and geometric patterns, its elegantly proportioned courtyards with burbling fountains, and the surrounding rose and orange gardens. Its interior walls are covered floor to ceiling with carved script in classical Arabic, which scholars have translated as praise for Allah, snippets of poetry and celebrations of the Nasrid rulers.

But on this morning’s visit, I was heading for a more mysterious world: the Alhambra’s secret network of underground tunnels and chambers.

At least, that was my hope. The Alhambra is the most popular attraction in Spain, drawing over two million visitors annually. It’s also one of the most strictly controlled thanks to its status as an Islamic outpost seized by Christians, which still has political overtones more than five centuries later. Gaining permission to visit its off-limits subterranean sections had been challenging. After emailing palace officials for weeks without response, I had already arrived in Granada when they bluntly denied my request. But then, suddenly, they reversed track. I received an urgent phone call: I had been approved to visit at 9 the next morning.

After reporting at a special office to fill out a string of forms, I cooled my heels for a half-hour in the company of an affable security guard named Jaime, who was wearing an earpiece, aviator sunglasses, and a black blazer with a green “A” sewn onto his lapel. Finally, Ignacio Martín-Lagos, a conservation officer, arrived and declared that he would be my Virgil to the palace’s subterráneo, a dimension of the complex that he said holds a special fascination for him. “The artistic beauty of the Alhambra aboveground is undeniable,” Martín-Lagos said in Spanish as we hopped over a metal barrier and walked along the fortress’s defensive walls. “But the most surprising thing is what lies below. It was really two structures. Only if you explore its subterranean levels can you grasp the palace’s true dimensions and understand how its day-to-day life really functioned.”

After passing a 40-foot drop without guardrails, which was not for the vertiginous, we arrived at the Torre de las Gallinas, or Tower of the Hens, where Martín-Lagos fished from his pocket a thin, six-inch-long master key. “You’re going to pass through the entire palace, but underground,” he said. After shouldering open a portal, he used his smartphone flashlight to guide us down worn stone steps into a labyrinth of tunnels and chambers once used by guards and staff. They were chilly, claustrophobic, and, when Martín-Lagos turned off the light, sepulchral. But the underground was once teeming with activity, he said. “The Alhambra was a palace-city. As well as soldiers, it had about a thousand civilian inhabitants to serve the royal family—cooks, bakers, cleaners—who could go back and forth down here, without bothering the sultan. You need to have a double perspective: the ornamental world above versus the practical world below.”

I began to realize that the Alhambra most visitors see, like the Palace of Versailles and the great British manor houses, required an elaborate hidden support system. The upstairs palace offered exquisite luxury, where the sultan lounged on silk pillows and ate slices of oranges and honey cakes. Downstairs was penumbral darkness broken by flickering torches, where the staff toiled unseen to seamlessly maintain the opulence. The security purpose of the tunnels was also crucial, Martín-Lagos added, pointing up at the ceiling. We were under the room where the sultan held his audiences. “Squadrons of soldiers were lined up here, ready to rush upstairs at a moment’s notice.” Nearby was a stairway that had only been discovered after a 1907 landslide, with 200 steps descending to a door hidden in the fortress walls. We then ascended and opened a trapdoor to a bell-shaped chamber with walls of raw stone that had been converted from a grain silo to a dungeon. (Prisoners were lowered 20 feet from the surface by rope, so it was impossible to escape.)

The grand finale was Martín-Lagos’ favorite site. As travelers at an outdoor café in a palace courtyard snapped photographs, he unlocked two panels of a metal trapdoor in the ground and heaved them open, sending up clouds of dust. “Take care!” he said, now pointing a hefty light down a tight spiral staircase. “Take lots of care!” The electric beams cut through the darkness to reveal a vast cistern, including an ancient bucket suspended by a rope and encrusted with skeletal algae. “The major problem of the Alhambra was water,” Martín-Lagos whispered in awe. “Enormous cisterns were needed to supply the palace and its huge staff.” According to Martín-Lagos, the German traveler Hieronymus Münzer saw this cavern in 1494 and declared that it was bigger than the cathedral in his home city. “We all know that the finest engineers in history were the Romans,” he said. “That’s undeniable. But we must acknowledge the technical skill of the Spanish Muslims.”

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Agua Amarga (Public domain via Wikimedia Commons)

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