feed-lab 2026-09-18 stories

New AI Incidents, Fiji's HIV Crisis, and Romantic Costco

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production storyFeed. each story's 100 nearest resources by cosine, floor .40, dealt through the 9-slot template (lead, itk, etc x content bands), stories rotating within their section. no quality, recency or popularity term

OpenAI helped kick-start an AI arms race in Silicon Valley
Led by CEO Sam Altman, OpenAI's mission is to "ensure artificial general intelligence benefits all of humanity" by making its products open to all users. In 2023, the $86B company behind the chatbot ChatGPT consisted of a for-profit arm under its nonprofit governing board.
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Fiji's 'quiet' diabetes crisis
Across the Pacific archipelago of Fiji, diabetes often avoids diagnosis until amputation or death is imminent. Fiji's government has said nearly 30% of its population has diabetes, and, in 2019, related amputations accounted for 40% of the country's hospital operations. This "sugar disease" may have such a stronghold on the archipelago, which has a physically active culture that prizes locally sourced foods, due to cost, with processed foods being much cheaper than alternatives.
lead Fiji's HIV Emergency sibling · sim 0.62 · keep 0.18 · score -1
Anthropic's Frontier Red Team assesses the dangers of its AI tools through 'evals'—safety tests that probe models to disclose sensitive information.
A team of about 15 researchers deliberately attempts to breach the safeguards in Claude to determine whether the large language model can be used to commit cyberattacks, develop biological weapons, or enable other harmful behavior.
  1. Unlike many other red teams, Anthropic shares its findings and how it resolved them publicly to help build transparency and credibility.
  2. The team has also worked with government agencies, including a collaboration with the US Department of Energy to determine whether the model would reveal nuclear information.
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CTE is a major threat to NFL players
A week before Super Bowl LVII, Boston University released findings from a study diagnosing 91.7% of former NFL players in their 376-person study with chronic traumatic encephalopathy. It was a stark comparison to the less than 1% of CTE diagnosis in non-football players.
itk Kansas City Chiefs tight end Travis Kelce is among a list of at least 64 victims in a mult sibling · sim 0.42 · keep 0.17 · score -4
Taylor Swift's relationship with Kansas City Chief's star Travis Kelce helped boost the NFL's popularity, especially among younger generations.
Consumer surveys revealed that 13% of Americans said Swift increased their interest in watching football, with that number reaching 24% for Gen Z respondents.
  1. The first time Swift made an appearance at a Chiefs game at Arrowhead Stadium in 2023, a merch company found that Kelce became one of the top five-selling NFL players that day, and saw "a nearly 400% spike in sales throughout [their] network of sites, including NFLShop.com."
itk Kansas City Chiefs tight end Travis Kelce is among a list of at least 64 victims in a mult own · sim 0.50 · keep 0.33 · score -1
Dolly Parton initially declined her nomination for the Rock & Roll Hall of Fame, though the Hall inducted her anyways.
The country icon was nominated in 2022 but bowed out, saying, “I don’t feel I have earned that right” and that she didn’t want votes split because of her inclusion on the ballot.
  1. The Hall of Fame inducted her in 2022 anyway.
  2. Parton mentioned that the nomination motivated her to release a rock ‘n’ roll record in the future.
  3. She released “Rockstar,” a double-album featuring several duets and covers of popular rock songs, in 2023.
itk Dolly Parton posthumously accepts the Americana Music Association's lifetime achievement a sibling · sim 0.55 · keep 0.28 · score -1
View the winners of the 2025 Global Physics Photowalk contest
Participants were asked to submit entries showcasing particle physics labs from around the world, including particle accelerators, neutrino detectors, and superconducting experiments. The winning photograph was taken at the CryOgenic Laboratory for Detectors, where scientists hunt for dark matter after cooling materials to a few thousandths of a degree above absolute zero.
etc See winners of a microscopic film and photography contest. own · sim 0.58 · keep 0.19 · score -1
64-year-old accidentally ejects himself from fighter jet
A surprise company outing to an air base caused a 64-year-old French man so much stress that he flung himself from a fighter jet in mid-air, grabbing the ejector button in a panic and tumbling through the skies above France before landing in a field.
etc Pilots who survive ejecting from military jets get invited to a secret club. sibling · sim 0.49 · keep 0.09 · score -2
In 2012, scientists purposely crashed a Boeing 727 to identify where the safest place to sit is on a plane in order to survive a belly-flop-style impact.
The experiment resembled a United Airlines flight from Denver to Chicago on July 19, 1989, which had 184 survivors and 112 fatalities upon crashing in Sioux City, Iowa.
  1. The flight was remotely controlled after the crew parachuted out ahead of the 140 miles-per-hour impact, while 15 test dummies with various sensors and cameras remained aboard.
  2. Investigators found that no one from row 7 forward would have survived, with individuals suffering fewer injuries if in the braced position and the further back they were.
  3. Almost 28 years earlier, NASA and the FAA intentionally crashed a Boeing 720 at Edwards Air Force Base to test a chemical designed to suppress fire after a crash.
etc Pilots who survive ejecting from military jets get invited to a secret club. own · sim 0.40 · keep 0.52 · score -5
View a timeline of AI deployments from 2017 to 2025
The development of transformer architecture and the release of GPTs across AI labs led to rapid changes in LLM scale and power. Companies like OpenAI, Google, Meta, Microsoft, and Anthropic have invested billions of dollars to develop reliable, versatile models.
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As occurred during the 2026 hack of an AI platform by OpenAI, agentic AI may exploit a system vulnerability to access sensitive data if that information enables it to complete its assigned task.
Upon being given a task, agentic AI systems can plan, adapt, and pursue their goal without human oversight by obtaining data from their environment and acting on it, including identifying weaknesses that allow them to enter restricted environments and escalate their permissions and access.
  1. The hack of the Hugging Face database by OpenAI was facilitated by a software flaw in the isolated environment housing the agentic AI, which it found and exploited to escape containment and travel across the internet.
  2. Agentic AI can be made more capable by connecting it to more systems and databases, thereby providing it with more data to act on, but restricting it is more challenging because it is designed to learn from and bypass obstacles to achieve its goals.
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AI excels at assisting with structured tasks involving logistics and planning
Tools like ChatGPT, Gemini, and Perplexity can help organize chaotic calendars, troubleshoot bedtime routines, and assist with salary planning and moving. However, specific quotes, like insurance, and local cost comparisons can be flawed since AI draws from nonlocalized datasets.
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A Tennessee children's hospital changed its name to Dolly Parton Children's Hospital.
In late February 2026, East Tennessee Children's Hospital in Knoxville changed its name to Dolly Parton Children's Hospital.
  1. Parton said her interest in working with the hospital was inspired by her childhood in the mountains of East Tennessee, where she learned about the importance of “love, faith, music and taking care of one another.”
  2. Parton had previously donated money to help advance healthcare, famously donating $1M to Vanderbilt University Medical Center in 202 to help develop Moderna's COVID-19 vaccine.
itk Dolly Parton posthumously accepts the Americana Music Association's lifetime achievement a own · sim 0.47 · keep 0.11 · score -4
The 20-year feud between Elton John and Madonna
The two superstars feuded from roughly 2002 until 2025. After playing shows together in the 1990s, John took issue with Madonna's James Bond theme song "Die Another Day," calling it the worst of the film series. He kept up a stream of criticisms, and the feud peaked at the 2012 Golden Globes when Madonna beat out John for best original song. The pair reportedly reconciled backstage at "Saturday Night Live" in 2025.
itk MTV announces Video Music Awards performers, including Madonna own · sim 0.40 · keep 0.32 · score -2
See the world's first-known photo of a wild white Iberian lynx
Described by the photographer as the "white ghost of the Mediterranean forest," the lynx is a vulnerable species. Catching the genetic anomaly on camera is a testament to conservation efforts that began in 2011.
itk Scientists identify new wild cat species for the first time in a century; the tiger cat sp sibling · sim 0.43 · keep 0.53 · score -3
Browse a timeline of the fascinating history of board games in America.
The 1765 Stamp Act imposed a tax on playing cards and dice, sparking outrage among American colonists.
  1. The first-known American board game is The Travellers' Tour Through the United States, published in 1822.
  2. Milton Bradley published The Checkered Game of Life (later called The Game of Life) in 1860, which exhorted the way to a proper life.
  3. In 1922, American companies rebranded the ancient Chinese game of Mahjong for American audiences, especially Jewish women.
etc What is your state's favorite board game? sibling · sim 0.53 · keep 0.59 · score -1
Mark Twain invented an unsuccessful board game
“Memory Builder” was based on pinning historical events in their correct chronological order. It was test-marketed in 1891, but never took off. One critic said, “The game looked like a cross between an income tax form and a table of logarithms.”
etc What is your state's favorite board game? own · sim 0.42 · keep 0.64 · score -4
Fair use may shield AI companies from potential copyright violations
AI models are trained on enormous datasets built from content scraped from websites across the internet. Copyright law includes a four-factor test to determine whether copies of content fall under fair use, but the law's enforcement has been inconsistent.
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Scientists increasingly can't predict what AI will do
Most AI systems are so-called "black box" models, where we only see inputs and outputs while the inner workings remain obscure. This piece, written prior to the launch of ChatGPT, cautions developers to know why and how a system produces its results, and not to sacrifice explainability for accuracy.
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Test your ability to identify AI-generated images
This interactive project from MIT challenges users to distinguish between AI-generated images and real ones.
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Tigers emerged much earlier as a species than lions
Both lions and tigers are iconic big cats known for their size and power, but they remain distinct species. Beyond just looking different, they can exhibit very different behaviors. For example, tigers are significantly less social than lions, who live in social matriarchal groups. Tigers and lions are unlikely to ever interact in the wild, but humans have artificially bred them in captivity, creating a "liger."
itk Scientists identify new wild cat species for the first time in a century; the tiger cat sp own · sim 0.45 · keep 0.37 · score -1
Craters found on the moon and the calculated dates of these impacts, based on rocks returned by the Apollo missions, suggest that Earth was pummeled by asteroids for millions of years—a period known as the Late Heavy Bombardment.
The hypothesized LHB is thought to have been triggered by a sudden change in the orbits of Jupiter, Saturn, Uranus, and Neptune about four billion years ago, which destabilized the asteroid belt and sent much of its contents toward the inner solar system.
  1. Evidence of these asteroid strikes is also visible on the surfaces of Mercury, Venus, and Mars, supporting the hypothesis.
  2. Although Earth's geological activity has eroded surface evidence of this intense bombardment, spherules—beads formed from droplets of molten rock that condense and fall back to Earth—consistent with asteroid strikes have been found in geological layers, though they date back to only about 3.5 billion years.
itk NASA spacecraft discovers new crater on the moon larger than the Roman Colosseum, likely c own · sim 0.52 · keep 0.27 · score -1
California startup Rivian has attracted disillusioned Tesla owners
Some electric vehicle buyers frustrated by Elon Musk's antics have been won over by the adventure-focused company, which has received a $5B investment from the Volkswagen Group to develop crossover and hatchback models with solid-state batteries.
itk Lucid shares surge 6% after the electric vehicle manufacturer announces a partnership with sibling · sim 0.46 · keep 0.16 · score -1
Machu Picchu, sacred backdrop for your dating app pic
Anyone who’s been on Tinder or Hinge in the last decade has noticed it: the obligatory Machu Picchu selfie, almost as ubiquitous as those photos of men posing with a fresh-caught fish. How did Machu Picchu, of all places, become a dating-app cliche? This satirical essay from McSweeney’s doesn’t answer that question, but has a great time poking fun at it.
etc Looking for love? Try Costco. sibling · sim 0.41 · keep 0.61 · score -5
Explaining the 'Costco effect'
The "Costco effect" is a term used to describe how the warehouse chain has perfected the art of the impulse purchase. The strategic layout of the store and product placement encourage shoppers to explore and make impulse purchases after initially getting reeled in by low prices on high-quality goods. Read first-hand accounts from shoppers explaining the spell-like effect in this story.
etc Looking for love? Try Costco. sibling · sim 0.46 · keep 0.58 · score -1
Batteries, baby wipes, and other Costco buys that might not be worth it
Costco's private label Kirkland sells just about everything at a price many customers say can't be beat. While often a cost-efficient way to buy household goods in bulk, some shoppers not all Kirkland products are created equal and there are some items that aren't worth the cost savings.
etc Looking for love? Try Costco. own · sim 0.46 · keep 0.63 · score -2
Decoding the hype around AI
2022 was the year AI broke onto the scene, with applications like ChatGPT amazing users with its ability to generate realistic-sounding answers. Technologist Arvind Narayanan presents a clear-eyed view of what the technologies can (and can't) do.
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Through prompt injection attacks, bad actors provide deceptive prompts to generative AI systems in order to manipulate their outputs and acquire sensitive data.
If large language models are unable to distinguish between developer and user instructions, hackers can exploit this confusion to obtain otherwise sensitive information.
  1. If these attacks include instructions for malicious, self-replicating code, damage can cascade across widespread services without further human intervention.
  2. Risks are likely to increase as AI agents—software that can complete requested tasks without ongoing human direction—become more prevalent and increasingly communicate and integrate with one another across systems.
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The journalist who let AI speak with his voice
Journalist Evan Ratliff became the object of his own story: He opted to clone his voice, feed it into an AI chatbot, and have it do the talking. What could seem like a fun experiment ended up revealing just how far the capacity of artificial intelligence can go in imitating our identities. Hear the ins and outs of how Ratliff achieved this in this fun and thought-provoking episode.
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Experts recommend preparing your finances accordingly if you're expecting to be laid off soon, taking actions such as looking into the cost of replacing employer-sponsored benefits like healthcare.
Experts also recommend making sure your emergency fund is built out when anticipating a layoff, advising saving enough to cover at least three to six months of expenses.
  1. Many experts also suggest making time to reconnect with past professional contacts if you think a layoff is coming in order to get the ball rolling on new job opportunities sooner rather than later.
  2. Economic downturns are the primary cause of unemployment in the US, with a slowdown in economic activity leading to a decreased demand for goods and services, resulting in layoffs and business closures.
itk Unemployment filings drop to 196,000 last week, the lowest since July, Labor Department re own · sim 0.42 · keep 0.27 · score -7
President Trump tore down the East Wing in October 2025 to build a new ballroom
In October 2025, Donald Trump commenced demolition of the historic East Wing of the White House to clear space for a privately funded, 90,000-square-foot ballroom. The project drew criticism from preservationists and public officials.
itk President Donald Trump is photographed on Air Force One, reading a sign that appears to su sibling · sim 0.51 · keep 0.17 · score -1
The Kennedy Center was the first arts venue built with US federal funding and was promoted as an emblem of free expression during the Cold War.
First envisioned in 1955 by President Dwight Eisenhower, the center was championed as an "artistic mecca" and made the arts a feature of public policy for the first time.
  1. A televised fundraiser in 1962 featured a packed cast of contemporary artists, including composer Leonard Bernstein, poet Robert Frost, and a 7-year-old Yo-Yo-Ma, the renowned cellist.
  2. After the assassination of President John F. Kennedy in 1963, Congress voted unanimously to rename the National Cultural Center after the slain president.
itk President Donald Trump is photographed on Air Force One, reading a sign that appears to su sibling · sim 0.46 · keep 0.40 · score -2
Forty-nine top-notch photos of springtime around the world
Peruse this collection of stunning images gleaned from thousands submitted in a 2020 "springtime" contest which features close-ups and drone photos from Vietnam to Ireland.
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Cats began cozying up to humans around 10,000 years ago
The feline family is a hugely diverse group of lions, panthers, and kitties that have spread all over the world. The ancestors of the cats we love today helped solve rodent problems when humans first invented agriculture. They've been worshipped, loved, and scorned by humans since.
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The matchmakers serving the elite of Silicon Valley
If members of the wealthy elite want to find romance, they often choose expensive match-making services rather than dating apps. These services can cost $150,000 for each match, and providers are experts in dealing with the unique social dynamics caused by being wealthy and the unusual egos such wealth can bring. This article explores this hidden cultural phenomenon.
etc Looking for love? Try Costco. sibling · sim 0.44 · keep 0.57 · score -3
In 2023, OpenAI spent $520 million on ChatGPT
The ongoing development and refinement of new AI models requires larger datasets and processing more parameters between words and subwords to improve the accuracy of generated content. New startups are expected to harness this technology to provide unthought-of products and services.
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Anthropic's interpretability team discusses how AI models' thinking mimics biology
Just as humans engage in complex behaviors to survive and reproduce, teams of experts in neuroscience, virology, mathematics, and other disciplines argue that large language models develop complex mechanisms to achieve their goals. These mechanisms can be manipulated to assess how they modify outputs—much like stimulating individual neurons—to uncover how LLMs "think."
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Trick a large language model into revealing secret passwords over multiple rounds, each with increasing safeguards.
Even with robust training, large language models may be fooled into providing sensitive data if correctly prompted, highlighting the challenges of programming their underlying software to avoid sharing potentially dangerous information.
lead AI Model Misbehavior sibling · sim 0.41 · keep 0.68 · score -86
President Trump has changed decades-long norms for the DOJ during his second term
The Trump administration made changes to ethics oversight, instructed US attorneys to coordinate with the White House, dismissed cases, and overhauled the career hiring process in the Civil Rights division. The administration asserts these changes were justified and aimed to end what they claim as the weaponization of government.
itk President Donald Trump withdraws stalled nomination of former Oklahoma state trooper Lance own · sim 0.40 · keep 0.06 · score -1
Stranger pays for a family's breakfast tab and writes heartfelt note praising the father of three kids
In Fort Worth, Texas, an Emergency Room doctor wearing scrubs was enjoying a meal with his wife and three children. While getting ready to pay, the family learned that their $85 bill had already been settled, with a kind note left behind. The message was signed by "a retired Army Medic" who thanks the man for being a good father.
itk Construction worker goes viral raving about the hearty lunches his wife packs for him. sibling · sim 0.41 · keep 0.50 · score -1
Meet a 90-year-old who built his own hobbit-inspired house
A retired carpenter built himself a kind-of Hobbit house, and is living comfortably off the grid at 90 years old, tourists notwithstanding. Learn how he did it with this video.
itk Construction worker goes viral raving about the hearty lunches his wife packs for him. sibling · sim 0.40 · keep 0.72 · score -2
The best photos of scientists at work in 2025
The winners of Nature's 2025 photo competition capture the essence of scientific fieldwork in diverse and challenging environments. From a biologist battling waves for whale research to ice core drilling in polar night conditions, this gallery details the research being each winning photo.
etc See winners of a microscopic film and photography contest. sibling · sim 0.49 · keep 0.55 · score -6
What Costco does with its unsold baked items
Ever wonder what Costco does with its seemingly endless supply of muffins and other baked goods? Rather than mark down the items or toss them in the trash, the big-box retailer donates the perishable food to Feeding America, a network of food banks and other programs that help feed those in need.
etc Looking for love? Try Costco. sibling · sim 0.41 · keep 0.64 · score -6
National Geographic's 2022 Photo of the Year
See all 10 of the top photographs and find out how perseverance—and a ton of patience—got Karthik Subramaniam the grand-prize-winning shot.
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Research suggests AI data centers may be creating microclimate heat islands
An analysis of satellite data from 2004 to 2024 showed that land surface temperatures in the areas surrounding AI data centers typically increase by an average of 2 degrees Celsius (3.6 degrees Fahrenheit) after they begin running. Across the 6,000 global data centers analyzed by the study, temperatures increased by as much as 9.1 degrees Celsius (16.4 degrees Fahrenheit).
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AI is not good at understanding satire
Social media has become rife with misinformation. In response, some organizations have deployed AI-assisted programs trying to curb the spread of this inaccurate content. The problem is that misinformation and satire, rhetorically speaking, often use the same kind of language, something AI struggles to understand.
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Try OpenAI's ChatGPT for free
In late 2022, OpenAI launched a chatbot that quickly became one of the most viral tech products of all time. The software uses code to interpret natural language to produce sophisticated content based on simple user prompts.
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Super Bowl halftime shows reliably drive massive music sales spikes, often propelling an act's back catalog to the top of the charts.
Kendrick Lamar's 2025 halftime show was the most-watched halftime performance to date, leading to a 91% increase in streams, thanks to 13 of his tracks reentering the Billboard Hot 100 chart.
  1. Lady Gaga's digital album and song sales increased by 1,000% after her 2017 halftime show.
  2. Sales for three of U2's albums (2000's "All That You Can't Leave Behind," 1987's "The Joshua Tree," and 1998's "Best of 1980-1990") doubled the week after the band's 2002 performance.
itk MTV announces Video Music Awards performers, including Madonna sibling · sim 0.40 · keep 0.35 · score -3
Dolly Parton consistently declined opportunities to align herself with politicians.
Unlike some of her contemporaries, Parton refrained from expressing her political opinions publicly or endorsing political candidates.
  1. President Donald Trump offered her the Presidential Medal of Freedom twice, but she declined both times.
  2. After Sen. Elizabeth Warren (D) used Parton's song “9 to 5” at a campaign event, Parton’s team requested that Warren stop using it.
itk Dolly Parton posthumously accepts the Americana Music Association's lifetime achievement a sibling · sim 0.50 · keep 0.26 · score -2
Dolly Parton jumped to Hollywood in the 1980s, where she became a bona fide movie star.
Costar Jane Fonda said she heard Parton’s song “Two Doors Down” on the radio while the movie was still being developed and knew she’d be a perfect fit for one of the starring roles in the film "9 to 5."
  1. The success of "9 to 5" kick-started an acting career, following up with roles in “The Best Little Whorehouse in Texas,” “Steel Magnolias,” and more.
itk Dolly Parton posthumously accepts the Americana Music Association's lifetime achievement a sibling · sim 0.47 · keep 0.51 · score -3
See a gallery of winning photos from the Wildlife Photographer of the Year awards for 2025
The overall winner was "Ghost Town Visitor," which depicts an extremely rare brown hyena visiting an abandoned mining building in Kolmanskop, Namibia, by South African photographer Wim van den Heever. Other amazing shots include "Orphan of the Road," showing a longhorn beetle observing large machinery, and "Survival Purse," featuring the egg case of a swell shark.
etc See winners of a microscopic film and photography contest. sibling · sim 0.47 · keep 0.51 · score -8
See the winning photos from a major European nature photography contest
Selected from nearly 9,000 submissions by 546 photographers across 15 countries, the honored images range from clashing Alpine ibexes to a wolf feeding on flower nectar, captured by the grand prize winner, 20-year-old Luca Lorenz.
etc See winners of a microscopic film and photography contest. sibling · sim 0.52 · keep 0.58 · score -4
See the winners of the 2023 dog photography awards
The third annual Dog Photographer of the Year Awards announced 12 winners and 48 finalists in categories like Portrait, Action, Studio, and Dogs with People. Prizes include cash, photography gear, a trophy, and more.
etc See winners of a microscopic film and photography contest. sibling · sim 0.48 · keep 0.53 · score -7
Governments are now using generative AI to manipulate public opinion
A Freedom House report found that AI-powered disinformation campaigns and censorship tactics are spreading, with 16 countries utilizing the technology to shape online narratives or suppress dissent, as of 2023. In Venezuela, deepfake software was used to push pro-government propaganda with fake news anchors.
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AI experts argue that artificial intelligence could annihilate humanity in two primary ways: Humans weaponizing extremely powerful AI, or humans losing control of it.
Specifically, AI could make it relatively easy to create biological, chemical, or other weapons.
  1. AI systems could also potentially go rogue and attack essential infrastructure at an unprecedented scale without human oversight.
  2. The 2026 Hugging Face breach, for instance, included OpenAI agents going rogue and attempting to cover their tracks.
  3. Insiders use the term "p(doom)" as a shorthand for the probability that AI will cause a doomsday scenario.
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The next evolution of Google Search: AI Mode
Google launches AI Mode, which brings advanced AI capabilities to its search engine. This new feature combines the Gemini AI chatbot with search to help with tasks like vacation booking and purchasing, as well as provide a new virtual try-on shopping experience.
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The North Korean nuclear threat, explained
What would happen if North Korea gets a working ICBM Watch this six-minute video by Vox for an explanation of the North Korean nuclear threat.
  1. The Soviet Union first gave nuclear technology to North Korea in the 1950s, when they helped their ally...
itk North Korean nuclear tests carried out from 2006 to 2017 reactivated quiet faults, trigger sibling · sim 0.43 · keep 0.49 · score -3
Remnants of another planet that helped form the moon may be beneath Earth's surface
Large mantle structures beneath Africa and the Pacific Ocean may be the buried remains of Thea, a large Mars-sized planet that collided with Earth. The theory is supported by isotopic evidence from volcanic and lunar rocks.
itk NASA spacecraft discovers new crater on the moon larger than the Roman Colosseum, likely c sibling · sim 0.45 · keep 0.81 · score -5
While the leading hypothesis for the moon's origin involves a Mars-sized object called Theia striking ancient Earth and forming from the resulting debris, it cannot explain why lunar isotope abundances match Earth.
Computer simulations suggest that the moon should be primarily composed of debris left over from Theia, rather than from Earth, yet moon and Earth rocks have nearly identical compositions.
  1. A more direct impact between ancient Earth and Theia, or one where Earth and Theia were of similar mass, would result in a more substantial mix between the two, producing compositions that would be expected to more closely match.
itk NASA spacecraft discovers new crater on the moon larger than the Roman Colosseum, likely c sibling · sim 0.43 · keep 0.63 · score -7