The Liberty Bell, with its famous crack, hasn't been rung in 180 years, but that hasn't stopped scientists from pondering what the bell might have sounded like when tolling. In honor of the nation's 250th anniversary, researchers at Penn State University have modeled its acoustic properties, drawing on data collected from one of the bell's replicas. The work was first presented at a meeting of the Acoustical Society of America in Philadelphia earlier this year, followed by an article in Physics Today.

Historians aren't sure exactly when the Liberty Bell acquired its distinctive crack, just that it occurred sometime between 1817 and 1846. An 1846 account in the Public Ledger described the ringing of the bell on February 23 that year and mentioned that the bell had developed a crack, which someone had attempted to fix by filing the sides down. But it didn't work: The February 23 ringing extended the crack even more, so much so that "the old Independence Bell ... now hangs in the great steeple irreparably cracked and forever dumb." Nobody has heard it ring since.

This wasn't the first time the bell had cracked; the rim cracked shortly after it arrived in Philadelphia in 1752, the first time the clapper struck while testing the sound. It was recast by two local foundry workers, John Pass and John Stow, not once but twice, because the first recast produced a sound that one bystander likened to coal scuttles banging together.

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Director Greta Gerwig could have made pretty much any movie she wanted after 2023's Barbie racked up nearly $1.5 billion at the box office. She chose to make Narnia: The Magician's Nephew for Netflix, an adaptation of C.S. Lewis' sixth novel in The Chronicles of Narnia series. Gerwig has said little publicly about the film, other than that she was inspired by 1960s-era David Bowie, although she said it would not be a musical. Netflix just released the trailer, set to "Stairway to Heaven," and it's quite the psychedelic ride.

The first book in the series, The Lion, the Witch, and the Wardrobe, was published in 1950, and Lewis did not initially intend to write any more Narnia adventures. But then an acquaintance asked how the London lamppost ended up in the middle of Narnia's woodland, and Lewis was intrigued enough by the question to start a prequel, The Magician's Nephew, in order to find an answer. Lewis found it difficult to finish the book, however, writing four other Narnia books first before completing The Magician's Nephew in 1955.

There have been several adaptations, in various media, of The Chronicles of Narnia, most recently the early 2000s film franchise adapting the first three novels in the series. Those films showed diminishing returns, however, and by 2011 the film rights had expired. There were initial plans to adapt the fourth novel, The Silver Chair.

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Honey bees are known to leave their stingers embedded in tender flesh once they sting you and fly away. Scientists have now determined that the stinger is able to continue pumping venom into its unfortunate victim even after the bee flies away, thanks to a unique double-piston pump-like mechanism, according to a new paper published in the Proceedings of the National Academy of Sciences.

Different species have evolved different mechanisms for delivering venom, which involves piercing the skin and then pumping venom from a gland or reservoir. Spiders, for instance, have muscles surrounding their venom glands, which contract and eject venom through hollow fangs. Bees, wasps, and ants deliver venom via their stingers, either by contracting muscles around the venom reservoir or through stiff elements called lancets working together to pump venom.

Honey bees (Apis mellifera) add a unique feature: Worker bees fly away after inserting their stingers in the target, leaving the stinger behind. The stinger continues to penetrate the tissue and pump venom on its own, a rare phenomenon known as autotomy. A honey bee's stinger has three main interlocking elements that form the venom canal: a stylet that widens to form the main pumping chamber and two sharp-tipped lancets that slide back and forth, piercing the tissue and pumping venom into the target. But the precise mechanism by which the pumping action is achieved has never been directly observed.

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Elon Musk is a very familiar figure to Ars readers, given his massive influence (for better and worse) on the technology sector over the last 20 years. Oscar-winning director Alex Gibney's latest biographical documentary—simply titled Musk—covers a lot of well-known ground and challenges the carefully crafted public image of Musk as a visionary tech titan.

Gibney's documentary presents Musk as more of a Gilded Age confidence man, rejiggered for the 21st century: an investor cosplaying as an inventor whose real genius is pumping stocks and dazzling investors and the public alike with visions of a high-tech utopian future. The film is bound to push all the right outrage buttons, whether one is a Musk fan or a detractor—which makes it very much a product of the peculiar social media-driven era in which we live.

Gibney has been making documentaries since the 1980s, covering such varied subjects as Jimi Hendrix, Hunter S. Thompson and gonzo journalism, WikiLeaks, Scientology, Steve Jobs, Elizabeth Holmes (the subject of another forthcoming documentary, You Can See Everything, featuring comedian Nathan Fielder), Boris Becker, The Sopranos creator David Chase, alleged Russian interference in the US 2016 presidential election, the opioid epidemic, and cyclist Lance Armstrong. He snagged his first Oscar nomination for 2005’s Enron: The Smartest Guys in the Room, and won the Oscar for Best Documentary Feature two years later for Taxi to the Dark Side.

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We got our first look at Prime Video's new sci-fi series Blade Runner 2099 in July at San Diego Comic-Con. With the show's premiere roughly six weeks away, the streamer unveiled the full trailer this weekend at New York Comic-Con. Co-stars Michelle Yeoh and Hunter Schafer (Euphoria) joined showrunner Silka Luisa (Shining Girls) onstage for the big reveal.

As Luisa described the show during the NYCC panel Saturday night:

We are 50 years after [Blade Runner] 2049 and, bad news, the worst has happened. The replicant uprising that has been bubbling up in the films has taken place and the humans have lost. So the creations have surpassed their creators. And the series, the big question it asks is, ‘What happens when our time as a species ends?’ 2099 is taking place at a junction point when one species is ending and a new one is rising. The first film, something I loved about it, was that it was looking at mortality on a micro level. Roy Batty and the other replicants were fighting for more life. This show asks that same question but on a macro level. Mankind—what happens when we realize our time is running out? And are we going to accept that loss? Can we hold on to our humanity during it?

Yeoh stars as Olwen, the dying Replicant, while Schafer plays Cora. The cast also includes Hugo Hamlet as Buster Friendly, as well as Dmitri Abold, Lewis Gribben, Katelyn Rose Downey, Daniel Rigby, Johnny Harris, Amy Lennox, Sheila Atim, Matthew Needham, Tom Burke, and Maurizio Lombardi—all in as-yet-undisclosed roles.

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Last month we covered the winner of Nikon's Small World in Motion video: Ning Xu of Tsinghua University in China, whose video captured tiny cilia beating in the airways of a child with a rare respiratory disorder. But allegations surfaced about Xu's use of AI while making the video. Nikon launched an investigation and concluded that Xu's entry did not comply with competition rules. The new winner is Nguyen Nam Nhat of Vietnam with a video of a tiny roundworm and a single-celled organism (above).

Founded in 2011, the Nikon Small World in Motion competition is a spinoff of the company’s Small World Photomicrography Competition, which has been around since 1974. Both are meant “to showcase the beauty and complexity of things seen through the light microscope”—one through still photographs, the other through photovideography, taking advantage of all the technological advances that now allow users to make movies or time-lapse images through the microscope.

The other winners also moved up a notch with Xu's disqualification. Benedikt Pleyer of Bavaria, Germany, placed second with a video of jellyfish larvae suspended in water droplets; Andrew Moore of Howard Hughes Medical Institute in the US placed third with a video of synchronized cell division in neighboring cells; Patrick Hickey of Hypha Research Ltd. in Edinburgh, Scotland, placed fourth with a video of the dynamics of mitochondria and chloroplasts in Turtle Vine leaf cells; and Igor Adameyko placed fifth with a video of a tiny, colorful sea slug (Cyerce kikutarobabai) on the move.

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Margaret Hamilton, who coined the term "software engineering" and led the development of onboard flight software for NASA's Apollo program in the 1960s, died last week at the age of 90. A recipient of the Presidential Medal of Freedom in 2016, Hamilton was also immortalized as a LEGO minifig the following year—part of the "Women of NASA" set that also included astronauts Mae Jemison and Sally Ride.

“To say Margaret Hamilton was a pioneer—to say she was ahead of her time—would be a dramatic understatement. She was a software engineer at a time when that field was in its infancy, and she not only developed advanced code herself but also led a team in using that nascent technology to develop one of the most complex systems humanity had ever achieved,” said Olivier de Weck, interim head of the MIT Department of Aeronautics and Astronautics. “The Apollo program still stands as one of our greatest testaments to the power of collaboration, ingenuity, and engineering, and Hamilton was a fundamental contributor to that program’s success.”

Born in 1936 in Paoli, Indiana, Hamilton graduated from Earlham College in 1958 with a degree in mathematics and a minor in philosophy—the latter a nod to her father (a poet) and grandfather (a headmaster). She married her first husband, James Cox Hamilton, that same year. The plan was for her to work until he finished his law degree, after which he would support her through graduate school to earn a PhD in mathematics.

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I found the trailer for Digger intriguing, starring a nearly unrecognizable Tom Cruise and giving off strong Dr. Strangelove vibes. Plus, it is four-time Oscar-winning director Alejandro G. Iñárritu’s (Birdman) first English-language film since 2015’s The Revenant. Those elements quickly moved it near the top of my "must-see" list even if details about the actual plot were lacking. Given Iñárritu’s pedigree, the film seemed poised to be prime Oscar bait.

(Major spoilers appear below the gallery. We'll give you a heads-up when we get there.)

By now it's clear that Digger is on track to be one of the biggest bombs of the year instead, racking up a mere $20 million globally its opening weekend, against a $125 million (possibly more) budget. It has sharply polarized critics and audiences alike, with some appreciating Iñárritu's bold, creative swings and others finding the film practically unwatchable.

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Francis Halzen, a physicist at the University of Wisconsin, Madison, has won the 2026 Nobel Prize in Physics "for decisive contributions to the IceCube Neutrino Observatory and the discovery of high-energy neutrinos of astrophysical origin.” Halzen spearheaded the development and construction of the IceCube Neutrino Observatory in Antarctica, enabling physicists to capture high-energy neutrinos created in the distant universe.

“It was a great surprise, and I obviously didn’t expect it,” Halzen said during a news conference in Stockholm, Sweden, speaking by phone from Italy. While the Nobel was awarded to Halzen, he emphasized that his work was the result of a “large collaboration” with other researchers.

“This reflects on the really courageous people who joined me in this project when really no respectable conservative physicist would have joined me. But many talented people did, and that’s why I’m here,” he said.

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Egyptologists have long debated whether the earliest pharaohs of the First Dynasty were buried with various servants and officials to serve them in the afterlife—a form of human sacrifice. But there is very little archaeological evidence available, given that many of the earliest Egyptian tombs were plundered and/or hastily excavated. A new paper published in the journal Frontiers in Environmental Archaeology reassesses a collection of skulls excavated from tombs in the 1920s and concludes that over one-third show evidence of blunt force trauma. This suggests that they may have been victims of so-called "retainer sacrifice."

Author Roselyn Campbell is a bioarchaeologist at Purdue University who has long been fascinated with the history of human sacrifice. "I'm interested in how we as human beings decide which types of violence are okay and which are not, and how we even define violence," Campbell told Ars. "It's very context-specific. We have to be careful not to extend our own ideas about what violence is and how it's used into other cultures. With Egypt, we have such a long history of European and colonial archeology; they came in with very specific ideas about what this culture was. You really have to make an effort to contextualize the legacy data we have."

Naturally she found the debate over whether ancient Egyptians practiced retainer sacrifice pertinent to her interests. "People tend to fall into one of two camps," said Campbell. "Either retainer sacrifice definitely happened, end of discussion, or it definitely didn't happen, end of discussion. But nobody's actually looked at the bones in a very long time." Forensic science has advanced considerably over the last century, so re-analysis could be useful. Complicating matters is the fact that older sets of remains are often incomplete and/or modified for preservation, destroying vital forensic information in the process.

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A wild African black panther prowls for prey. An orphaned baby pangolin must learn how to climb on its own. And a green turtle struggles to make it back to the water after laying her eggs on a remote island, rescued by local humans who carry the exhausted turtle to the water's edge. These animals and many other species are featured in Africa: Earth's Wild Home, a new documentary series from National Geographic. It's meant to launch a new franchise, with separate series documenting the wildlife and environmental ecosystems of all seven continents in turn.

The seven-episode documentary series took four years to complete, with filming taking place across nearly 30 different African countries. Each episode focuses on a specific ecosystem, from the jungle and the desert, to the plains, mountains, and islands of Africa, and closes by spotlighting the various scientists, photographers, and NatGeo explorers whose work made the series possible. The final episode focuses on the local conservation leaders and researchers working to preserve Africa's rich biodiversity for future generations.

The producers found the perfect narrator in Wunmi Mosaku, who has delivered powerful performances in such works as Sinners, Loki, and Lovecraft Country. "I was incredibly honored that they even know my name at Nat Geo," Mosaku told Ars. "It was wonderful to be asked to narrate the series. It means so much to me. As someone who was born in Nigeria and raised in England, I'll take any opportunity I can to reconnect and celebrate this incredible continent where life is so diverse and so extreme and beautiful and relentless and peaceful. I wanted to be a part of that because it's a part of me."

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It’s a regrettable reality that there is never enough time to cover all the interesting scientific stories we come across. So every month, we highlight a handful of the best stories that nearly slipped through the cracks. September’s list includes a tantalizing hint of the elusive dark matter at the LUX-ZEPLIN detector; entangled Z bosons at the Large Hadron Collider; possible use of psychoactive substances in the Late Pleistocene; and an intriguing technical description of a telescope attributed to Galileo.

A hint of dark matter?

Physicists believe dark matter makes up roughly 85 percent of matter in our universe, with the strongest (but not only) candidate being so-called weakly interacting massive particles (WIMPs). But directly detecting WIMPs, or other alternative hypothetical dark matter particles, has eluded physicists for decades. We might have our first glimpse, however, courtesy of the LUX-ZEPLIN detector buried deep in a gold mine in South Dakota. Those potentially exciting results were presented in a scientific talk at the 2026 TeV Particle Astrophysics conference in Japan, with a preprint available on the arXiv. (It has been submitted to Physical Review Letters for peer review.)

The announcement came with strong caveats: the signal is just a hint, well below the threshold needed to confirm discovery, and might just be a statistical fluke. Anyone who regularly follows dark matter news knows that past tantalizing anomalies evaporated as more data came in. But the LUX-ZEPLIN team was unable to account for this event and decided to report their result to the broader physics community. They are still collecting data, as is the XENONnT at the Gran Sasso National Laboratory in Italy. And China's PandaX detector is currently being built.

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With its premiere just two weeks away, Marvel Studios has dropped one last trailer for the limited series, VisionQuest, which will complete the trilogy begun with WandaVision and Agatha All Along.

(Spoilers for WandaVision and Agatha All Along below.)

As previously reported, Marvel’s streaming TV portfolio has kind of been all over the place: a handful of hits, a few misses, and a bunch of middling offerings. One standout was WandaVision, followed by an excellent sequel (of sorts), Agatha All Along. VisionQuest will complete the trilogy. Vision (Paul Bettany) died in Infinity War, but WandaVision resurrected an all-white version whose memories were restored in the finale. We finally get to learn what happened afterward.

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Old-fashioned striped barbershop poles turn in place on a vertical axis, but humans typically perceive the stripes moving upward rather than turning with the pole. It's a well-known visual illusion arising from processing biases in human vision. According to a new paper published in the journal Nature, a similar effect could explain how butterflies often evade predatory birds: Their flight patterns and wing patterns combine to make it hard for predators to accurately gauge speed and direction.

"The stripes and spots on many butterflies’ wings interfere with the way visual systems try to guess the direction and speed of moving things, boosting false motion cues while hiding the butterfly's true heading," said co-author George Hancock of the University of Exeter in Cornwall. "The illusions interfere with the predator’s most basic visual targeting system and disrupt the final ‘ballistic attack’ in the tens of milliseconds when it commits to grabbing its prey, with no time to change course. As a result, birds and other predators will often simply miss."

Butterfly wings have long fascinated scientists, ever since the first documentation of the growth of said wings back in 1938. By 2021, researchers at MIT had captured on video the unique structural growth of butterfly wings—continuously, as a butterfly develops inside its chrysalis—for the very first time. Butterfly wings are an example of structural color in nature: the bright iridescent colors don’t come from pigment molecules but from what physicists call photonic crystals. The scales of chitin (a polysaccharide common to insects) are arranged like roof tiles. Essentially, they form a diffraction grating, except photonic crystals only produce certain colors, or wavelengths, of light, while a diffraction grating will produce the entire spectrum.

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