Every human body contains a small population of cells that are not genetically its own -- cells that crossed the placenta during pregnancy and that persist for decades after birth. These "microchimeric" cells, named after the lion-goat-serpent hybrid of Greek mythology, have been found in every organ studied so far, though they are exceedingly rare: one such cell exists for every 10,000 to 1 million of a person's own cells. The cells were first noticed in the late 1800s when pathologist Georg Schmorl described placenta-like "giant cells" in the lungs of people who had died from eclampsia. In 1969, researchers detected Y-chromosome-containing white blood cells in people who would later give birth to boys. For more than two decades, scientists presumed these cells were temporary. That changed in 1993 when geneticist Diana Bianchi found Y-chromosome cells in women who had given birth to sons up to 27 years earlier. The cells appear to have regenerative properties, transforming into blood vessels or skin cells to promote wound healing. They also challenge a central assumption of immunology -- that the immune system classifies cells as either "self" or "non-self" and rejects foreign material. Microchimeric cells should trigger rejection but do not. Higher-than-typical concentrations have been found in people with autoimmune conditions including diabetes, lupus, and scleroderma.

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Costco's consistency -- from its $1.50 hot dog and drink combo to its functional shopping carts and satisfied employees -- has produced what The Atlantic calls a "cultlike loyalty" among members at more than 600 locations across the U.S. Its annual membership costs $65. The model traces back to Fedco, a nonprofit wholesale collective for federal employees founded in Los Angeles in the 1940s. Costco's private label Kirkland Signature has become one of the world's largest consumer packaged goods brands while maintaining deliberately understated branding. The company relies on word-of-mouth marketing from satisfied members rather than traditional advertising. Atlantic staff writer Jake Lundberg, who shops at the Granger, Indiana location, describes the stores as spaces of "cooperation, courtesy, and grown-ups mostly acting like grown-ups." Shoppers follow unwritten rules: move along, don't block the way, step aside to check your phone. Checkout lines form orderly queues. The exceptions come near sample stations and before major holidays, when spatial awareness and common courtesy break down.

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Iran is offering to sell advanced weapons systems including ballistic missiles, drones and warships to foreign governments for cryptocurrency, in a bid to use digital assets to bypass western financial controls. From a report: Iran's Ministry of Defence Export Center, known as Mindex, says it is prepared to negotiate military contracts that allow payment in digital currencies, as well as through barter arrangements and Iranian rials, according to promotional documents and payment terms analysed by the Financial Times. The offer, introduced during the past year, appears to mark one of the first known instances in which a nation state has publicly indicated its willingness to accept cryptocurrency as payment for the export of strategic military hardware. Mindex, a state-run body responsible for Iran's overseas defence sales, says it has client relationships with 35 countries and advertises a catalogue of weapons that includes Emad ballistic missiles, Shahed drones, Shahid Soleimani-class warships and short-range air defence systems.

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Three decades after RFC 1883 promised to future-proof the internet by expanding the available pool of IP addresses from around 4.3 billion to over 340 undecillion, IPv6 has yet to achieve the dominance its creators envisioned. Data from Google, APNIC and Cloudflare analyzed by The Register shows less than half of all internet users rely on IPv6 today. "IPv6 was an extremely conservative protocol that changed as little as possible," APNIC chief scientist Geoff Huston told The Register. "It was a classic case of mis-design by committee." The protocol's lack of backward compatibility with IPv4 meant users had to choose one or run both in parallel. Network address translation, which allows thousands of devices to share a single public IPv4 address, gave operators an easier path forward. Huston adds: "These days the Domain Name Service (DNS) is the service selector, not the IP address," Huston told The Register. "The entire security framework of today's Internet is name based and the world of authentication and channel encryption is based on service names, not IP addresses." "So folk use IPv6 these days based on cost: If the cost of obtaining more IPv4 addresses to fuel bigger NATs is too high, then they deploy IPv6. Not because it's better, but if they are confident that they can work around IPv6's weaknesses then in a largely name based world there is no real issue in using one addressing protocol or another as the transport underlay." But calling IPv6 a failure misses the point. "IPv4's continued viability is largely because IPv6 absorbed that growth pressure elsewhere -- particularly in mobile, broadband, and cloud environments," said John Curran, president and CEO of the American Registry for Internet Numbers. "In that sense, IPv6 succeeded where it was needed most." Huawei has sought 2.56 decillion IPv6 addresses and Starlink appears to have acquired 150 sextillion.

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An anonymous reader shares a report: Only the government could spend 20 years creating a national ID that no one wanted and that apparently doesn't even work as a national ID. But that's what the federal government has accomplished with the REAL ID, which the Department of Homeland Security (DHS) now considers unreliable, even though getting one requires providing proof of citizenship or lawful status in the country. In a December 11 court filing [PDF], Philip Lavoie, the acting assistant special agent in charge of DHS' Mobile, Alabama, office, stated that, "REAL ID can be unreliable to confirm U.S. citizenship." Lavoie's declaration was in response to a federal civil rights lawsuit filed in October by the Institute for Justice, a public-interest law firm, on behalf of Leo Garcia Venegas, an Alabama construction worker. Venegas was detained twice in May and June during immigration raids on private construction sites, despite being a U.S. citizen. In both instances, Venegas' lawsuit says, masked federal immigration officers entered the private sites without a warrant and began detaining workers based solely on their apparent ethnicity. And in both instances officers allegedly retrieved Venegas' Alabama-issued REAL ID from his pocket but claimed it could be fake. Venegas was kept handcuffed and detained for an hour the first time and "between 20 and 30 minutes" the second time before officers ran his information and released him.

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As the calendar flips to January 1, 2026, thousands of copyrighted works from 1930 are entering the US public domain alongside sound recordings from 1925, making them free to copy, share, remix and build upon without permission or licensing fees. The literary haul includes William Faulkner's As I Lay Dying, Dashiell Hammett's full novel The Maltese Falcon, Agatha Christie's first Miss Marple mystery The Murder at the Vicarage, and the first four Nancy Drew books. The popular illustrated version of The Little Engine That Could also joins the commons. Betty Boop makes her public domain debut through her first appearance in the Fleischer Studios cartoon Dizzy Dishes. The original iteration of Disney's Pluto -- then named Rover -- enters as well. Nine additional Mickey Mouse cartoons and ten Silly Symphonies from 1930 are now available for reuse. Films entering the public domain include the Academy Award-winning All Quiet on the Western Front, the Marx Brothers' Animal Crackers, and John Wayne's first leading role in The Big Trail. Musical compositions going public include George and Ira Gershwin's "I Got Rhythm," Hoagy Carmichael's "Georgia on My Mind," and "Dream a Little Dream of Me." Sound recordings from 1925 now available include Bessie Smith and Louis Armstrong's "The St. Louis Blues" and Marian Anderson's "Nobody Knows the Trouble I've Seen." Piet Mondrian's Composition with Red, Blue, and Yellow rounds out the artistic entries.

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The European Space Agency has acknowledged yet another security incident after a cybercriminal posted an offer on BreachForums the day after Christmas claiming to have stolen over 20GB of data including source code, confidential documents, API tokens and credentials. The attacker claims they gained access to ESA-linked external servers on December 18 and remained connected for about a week, during which they allegedly exfiltrated private Bitbucket repositories, CI/CD pipelines, Terraform files and hardcoded credentials. ESA said that the breach may have affected only "a very small number of external servers" used for unclassified engineering and scientific collaboration, and that it has initiated a forensic security analysis.

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Mark Thomson, a professor of experimental particle physics at the University of Cambridge, takes over as CERN's director general this week, and one of his first major decisions during his five-year tenure will be shutting down the Large Hadron Collider for an extended upgrade. The shutdown starts in June to make way for the high-luminosity LHC -- a major overhaul involving powerful new superconducting magnets that will squeeze the collider's proton beams and increase their brightness. The upgrade will raise collisions tenfold and strengthen the detectors to better capture subtle signs of new physics. The machine won't restart until Thomson's term is nearly over. Thomson is far from disconsolate about the downtime. "The machine is running brilliantly and we're recording huge amounts of data," he told The Guardian. "There's going to be plenty to analyse over the period." Beyond the upgrade, Thomson must shepherd CERN's plans for the Future Circular Collider, a proposed 91km machine more than three times the size of the current collider. Member states vote on the project in 2028; the first phase carries an estimated price tag of 15 billion Swiss francs (nearly $19 billion).

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Instagram head Adam Mosseri closed out 2025 by acknowledging what many have long suspected: the era of trusting photographs as accurate records of reality is over, and the platform he runs will need to fundamentally adapt to an age of "infinite synthetic content." In a slideshow posted to Instagram, Mosseri wrote that for most of his life he could safely assume photographs or videos were largely accurate captures of moments that happened, adding that this is clearly no longer the case. He predicted a shift from assuming what we see is real by default to starting with skepticism and paying attention to who is sharing something and why.

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New Jersey has found its answer to the relentless flooding that has plagued the state's coastal and inland communities for decades: buy the homes, demolish them and turn the land back into open space permanently. The state's Blue Acres program has acquired some 1,200 properties since 1995, spending more than $234 million in federal and state funds to pay fair market value to homeowners exhausted by repeated floods from tropical storms, nor'easters, and heavy rain. A Georgetown Climate Center report this month called the program a national model, crediting its success to faster processing than federal buyout programs, stable state funding and case managers who guide each homeowner through the process. The demolished homes become grass lots that absorb rainwater far better than concrete and asphalt. Manville, a borough of 11,000 at the confluence of two rivers about 25 miles southwest of Newark, has sold 120 homes to the state for roughly $22 million between 2015 and 2024. Another 53 buyouts are underway there. The need for such programs is only growing. Sea levels along the New Jersey coast rose about 1.5 feet over the past century -- more than double the global rate -- and a Rutgers study predicts a further increase of 2.2 to 3.8 feet by 2100. A November report from the Natural Resources Defense Council noted that billions in previously approved FEMA resilience grants have already been cancelled, making state-run initiatives like Blue Acres increasingly essential.

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An anonymous reader shares a report: Getting to space is hard. In many ways, getting back is even harder. NASA soon aims to pull off the kind of re-entry it last conducted more than 50 years ago: safely returning astronauts to Earth after they fly to the moon and back. The mission is a big moment for NASA, which will put a crew on its Orion ship for the first time. The flight will test the spacecraft's heat shield, designed to protect the astronauts on board. Re-entries of vehicles from orbit remain one of the high-stakes parts of any human spaceflight, given the stress they put on spacecraft. In 2003, NASA's Columbia Space Shuttle broke apart as it came back from low-Earth orbit due to a breach on the vehicle that occurred during launch. All seven astronauts on board were killed. Orion will be coming back to Earth from much further away than low-Earth orbit, where all recent human spaceflights have been conducted. That means its velocity and the energy it needs to disperse will be greater, putting even more stress on the heat shield. During a test flight in 2022 that didn't include astronauts, Orion's heat shield didn't perform as expected. That sparked worries about crew safety on future missions, prompting NASA to investigate and address what happened. NASA will launch Orion with the astronauts on board as soon as February. [...] When the vehicle initially re-enters the Earth's atmosphere, it will be traveling around 25,000 miles an hour and face temperatures of 5,000 degrees as it slows down. The Orion craft, developed by Lockheed Martin for NASA, has a shield that is almost 17 feet in diameter. Installed on the vehicle's underside, the shield is covered in what is called an "ablative" material, which is designed to shift heat away from the craft during re-entry by burning off in a controlled manner.

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JPMorgan Chase is now fighting to avoid paying $10.2 million in disputed legal charges racked up by Charlie Javice, the convicted founder of student-finance startup Frank, after court filings revealed her defense team billed more than $5 million simply for attending her fraud trial -- including on days when court wasn't even in session. A previously sealed Delaware court filing [PDF] released Monday showed that Javice's total legal tab has reached $74 million, far exceeding the $30 million Elizabeth Holmes spent defending herself in the Theranos case. JPMorgan claims the five law firms representing Javice operated under the mindset that "someone else is paying her bills." The bank's filing focused on Quinn Emanuel and Mintz Levin, the two largest firms on Javice's defense. JPMorgan said Javice had between 16 and 29 lawyers and legal staff present every day of her six-week trial, billing an average of $360,000 daily. No more than four lawyers had speaking roles. Among the 2,377 pages of receipts submitted for March: a Cookie Monster toddler's toy, lavender and jasmine sachets, 57 hotel room upgrades at $300 per night, and a $900 meal at Koloman, a highly rated New York restaurant. A New York jury found Javice guilty in March of misleading JPMorgan into acquiring Frank for $175 million by fabricating millions of fake users. She was sentenced in September to seven years in prison but remains free on bail pending her appeal.

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The fight over net neutrality saw another turbulent year in 2025, as federal protections that seemed poised for a comeback in 2024 were first struck down by a court and then preemptively removed by the Trump administration's FCC without a chance for public comment. The removal, The Verge summarizes in a report, was part of Chairman Brendan Carr's "Delete, Delete, Delete" initiative targeting what the agency deems unnecessary regulations. Federal net neutrality rules have now been on and off for 15 years, passing under Obama in 2010, returning in 2015, getting overturned in 2017, and briefly revived in 2024 before courts struck them down again. Matt Wood, vice president of policy and general counsel at nonprofit Free Press, told The Verge that ISPs often feel little financial impact from these rules. "A lot of their complaints about the supposed 'burdens' from these rules are really just ideological in nature," Wood said. States have filled the void. California's 2018 law remains the nation's gold standard, and Maine passed a bipartisan bill in June. John Bergmayer, legal director at Public Knowledge, said state-level laws and the threat of new ones "has kept some of the worst outcomes in check." The National Telecommunications and Information Administration is now pressuring states to exempt ISPs from net neutrality laws to remain eligible for broadband infrastructure funding. Chao Jun Liu of the Electronic Frontier Foundation summed up the year's pattern: "ISPs just want to do whatever they want to do with no limits and nobody telling them how to do it."

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A large-scale study tracking more than 27,500 middle-aged and elderly people over roughly nine years has found that poor sleep quality is associated with accelerated brain aging, and chronic inflammation appears to be one of the key mechanisms driving this effect. Researchers at Sweden's Karolinska Institute assessed participants' sleep across five dimensions -- chronotype, duration, insomnia, snoring and daytime sleepiness -- and later scanned their brains using MRI to estimate biological brain age through machine learning models. The results? For every point decrease in healthy sleep score, the gap between brain age and chronological age widened by approximately six months. Those in the poorest sleep category had brains that appeared roughly one year older than their actual age. Night-owl tendencies, sleep duration outside the 7-8 hour sweet spot and snoring were particularly strongly linked to brain aging. The researchers measured low-grade inflammation using biomarkers including C-reactive protein levels and white blood cell counts. Inflammation accounted for more than 10% of the association between poor sleep patterns and brain aging. The glymphatic system, which clears waste from the brain primarily during sleep, may also play a role, the research added.

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Another year wraps up, and with it comes the annual ritual of taking stock. What were the movies, TV shows and books from this year that stood out to you? Not necessarily the ones that dominated conversation or topped charts, but the ones you found yourself recommending to friends, or returning to for a second watch or read. Share your picks and, if you're inclined, a line or two on what made them stick.

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Colossal Biosciences, the Texas-based startup now valued at more than $10 billion that has attracted investments from Paris Hilton, Peter Jackson and Tom Brady, claimed earlier this year to have resurrected the dire wolf -- an animal that disappeared at the end of the last ice age -- but a group of leading canid experts concluded the company had done no such thing. The scientists found that Colossal had made 20 edits to the DNA of grey wolves and the resulting animals did not substantially differ from wolves currently roaming North America. Beth Shapiro, Colossal's own chief scientist, acknowledged to New Scientist: "It's not possible to bring something back that is identical to a species that used to be alive. Our animals are grey wolves with 20 edits that are cloned." Nic Rawlence, director of the palaeogenetics laboratory at the University of Otago in New Zealand, added: "Rather than true de-extinction, Colossal's attempts are genetically engineered poor copies at best, passed off as the real deal." The company has nevertheless pressed forward. It has launched projects to revive the Tasmanian tiger, the dodo, and the moa and plans to unveil its interpretation of the woolly mammoth -- a genetically modified Asian elephant adapted to survive at -40C -- in the coming years. The Trump administration cited the dire wolf announcement while making efforts to cut the US endangered species list, calling de-extinction technology a potential "bedrock for modern species conservation."

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Starting in July 2026, every public school district in California will be required to have policies on the books that restrict or prohibit students from using smartphones during the school day, thanks to Assembly Bill 3216 that Governor Gavin Newsom signed into law back in 2024. The legislation also mandates that districts update these policies every five years. Newsom had previously signed related legislation in 2019, though that earlier law merely affirmed that school districts have the authority to regulate smartphone use rather than requiring them to do so.

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Finnish authorities on Wednesday seized a vessel suspected of severing an undersea telecommunications cable that connects Helsinki to Tallinn by dragging its anchor across the Gulf of Finland, the latest in a string of infrastructure incidents that have put Baltic Sea nations on edge since Russia's 2022 invasion of Ukraine. Police are investigating the case as aggravated criminal damage and have not disclosed the ship's name, nationality or details about its crew. The cable belongs to Finnish telecoms group Elisa. Estonia's justice ministry reported that a second telecoms cable connecting the two countries -- owned by Sweden's Arelion -- also went down on Wednesday. This follows Finland's December 2024 boarding of the Russian-linked oil tanker Eagle S, which investigators said damaged a power cable and multiple telecoms links using the same anchor-dragging method. A Finnish court in October dismissed criminal charges against the Eagle S crew after prosecutors failed to prove intent.

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China's Commerce Ministry on Wednesday demanded that the Netherlands "immediately correct its mistakes" over chipmaker Nexperia, escalating a standoff that has disrupted global semiconductor supply chains and triggered warnings from automakers about component shortages. The Dutch government in September invoked a Cold War-era law to effectively seize control of the Chinese-owned chipmaker, reportedly after the United States raised security concerns. China responded by blocking Nexperia products from leaving the country. Nexperia manufactures billions of foundation chips -- transistors, diodes and power management components -- that are produced in Europe, assembled and tested in China, and then re-exported to customers worldwide. These low-tech, inexpensive chips are essential in almost every device that uses electricity, from car braking systems and airbag controllers to electric windows and entertainment systems. The Commerce Ministry spokesperson said the Netherlands "remains indifferent and stubbornly insists on its own way, showing absolutely no responsible attitude towards the security of the global semiconductor supply chain." Dutch Economy Minister Vincent Karremans has repeatedly defended the intervention. Auto industry groups have warned that disruptions have not been fundamentally resolved. Japan's Nissan and German supplier Bosch have flagged looming shortages, and the German Association of the Automotive Industry warned of elevated supply risks "particularly for the first quarter" of 2026.

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The U.S. has surpassed 2,000 measles cases for the first time in more than 30 years, according to data from the Centers for Disease Control and Prevention. From a report: As of Dec. 23, a total of 2,012 cases have been reported in the U.S. Of those cases, 24 were reported among international visitors to the U.S.

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