Dark Matter Detector Records Tantalizing Signal: The LUX-ZEPLIN experiment has recorded its most intriguing event yet: a single particle interaction that researchers cannot readily explain using known backgrounds and that is consistent with a weakly interacting massive particle, or WIMP. LZ uses 10 tonnes of ultrapure liquid xenon nearly a mile underground in South Dakota, where shielding eliminates much of the radiation that could mimic dark matter. The unusual event produced the light and electron signals expected when a particle strikes a xenon nucleus. Researchers stress that one event is nowhere near a discovery; its statistical significance is about 2.6 sigma, well below particle physics’ five-sigma standard. LZ will continue collecting data to determine whether similar events appear. Confirmation would constitute the first direct detection of dark matter. (Berkeley Lab News Center)

Ebola Death Toll Passes 3,000 in Congo: The Ebola outbreak in the Democratic Republic of Congo has killed more than 3,000 people as transmission accelerates and public health measures fall well short of established targets. The country has recorded 6,186 confirmed cases and 3,007 deaths, with infections spreading across six provinces. CDC researchers found serious weaknesses in case detection, contact tracing, laboratory testing, isolation and safe burials. Only 15% to 20% of new cases had previously been identified as contacts, compared with a target above 90%, suggesting many transmission chains remain undetected. Meanwhile, the World Health Organization has recommended rapidly launching a ring-vaccination trial using the Ervebo Ebola vaccine. Although Ervebo targets the Zaire strain, animal studies suggest it may provide some protection against the Bundibugyo strain driving the current outbreak. (CIDRAP)

Semaglutide Extends Lifespan in Older Mice: Semaglutide, the GLP-1 drug widely used for diabetes and obesity, extended lifespan and slowed multiple biological signs of aging in healthy older female mice. Researchers began treating mice at 20 months—roughly comparable to late middle age in humans—and found median lifespan increased from 742 to 834 days, about 12 percent. Treated animals also performed better on measures of coordination, muscle function and glucose metabolism. At the cellular level, semaglutide reduced inflammation, cellular senescence, genomic instability and mitochondrial dysfunction while improving stem-cell function and neurogenesis. Many changes resembled those produced by calorie restriction, although experiments suggested reduced food intake did not fully explain the benefits. The Nature study raises the possibility that GLP-1 drugs influence fundamental aging mechanisms, but whether comparable effects occur in humans remains unknown. (Nature)

AI Starts Inventing Physics Experiments: Artificial intelligence is moving beyond analyzing experimental data and beginning to design the experiments themselves. Researchers tested AI-driven methods across multiple areas of physics and found that algorithms could devise unconventional experimental configurations that matched or exceeded human-designed setups. Rather than merely optimizing parameters in an existing apparatus, the systems generated fundamentally new layouts, sometimes violating design intuitions physicists had developed over decades. The work, published in Nature, examines AI-designed experiments involving quantum optics, gravitational-wave detection and particle physics and explores how scientists can interpret the often surprising solutions algorithms produce. The researchers argue that AI could become a genuine collaborator in experimental science, searching enormous configuration spaces that humans cannot practically explore. The challenge will be ensuring proposed experiments remain physically meaningful, understandable and feasible to construct. (Nature)

Blood Cells Infiltrate the Aging Human Brain: A long-standing assumption about the brain’s immune system is being overturned. Microglia—the resident immune cells of the brain—were generally thought to originate early in development and remain largely self-renewing throughout life. New lineage-tracing evidence from human brains indicates that this isolation gradually breaks down with age. Immune cells originating in bone marrow enter the circulation, migrate into the brain and increasingly replace resident microglia. The discovery reveals a previously underestimated connection between the aging brain and the rest of the immune system. Understanding which cells enter, what prompts their migration and whether they protect or damage neural tissue could have implications for neurodegenerative diseases involving inflammation, including Alzheimer’s and Parkinson’s. More broadly, the findings add to mounting evidence that the brain is considerably less immunologically isolated than scientists once believed. (Nature)

Giant Scorpion Roamed Britain Before Forests: A meter-long scorpion armed with enormous pincers prowled what is now Britain roughly 415 million years ago—before Earth had forests. Paleontologists studying fossils of Brontoscorpio anglicus reconstructed the animal’s anatomy and concluded that it was considerably larger and more formidable than modern scorpions. Its size is particularly surprising because theories explaining later giant arthropods frequently invoke the high atmospheric oxygen concentrations of the Carboniferous period. Brontoscorpio lived tens of millions of years earlier, suggesting giant arthropods could evolve under very different atmospheric conditions. Researchers also suspect the animal may have been semi-aquatic, potentially moving between shallow water and land. The reconstruction provides a glimpse of terrestrial ecosystems during a transformative period when plants and animals were establishing themselves on land and predatory arthropods were among the planet’s largest terrestrial animals. (ScienceDaily)

Hubble Finds Decagon Circling Saturn’s Pole: Saturn’s famous north-polar hexagon now has an unexpected southern counterpart: a giant 10-sided atmospheric wave. Astronomers examining Hubble Space Telescope observations identified a decagon encircling Saturn’s south pole, moving independently from surrounding atmospheric flows. The feature became conspicuous in 2025 imagery, although researchers subsequently identified weaker evidence dating to 2023. NASA’s Cassini spacecraft never observed it during more than 13 years around Saturn, suggesting the structure formed or became visible relatively recently. Scientists do not yet know what created the polygon, although disturbances associated with a nearby storm are one possibility. Saturn’s rapid 10.7-hour rotation produces powerful atmospheric jets, but why some organize into stable geometric patterns remains mysterious. Hubble will observe Saturn again this month, potentially revealing whether the decagon is evolving or stabilizing. (Science News)

Very Strong El Niño Heads Toward 2027: The World Meteorological Organization says the current El Niño will strengthen into a very strong event, with a nearly 100 percent probability that El Niño conditions will persist through February 2027. The Niño 3.4 region averaged about 2°C above normal in July, while weekly anomalies later climbed to roughly 2.2°C–2.6°C. Some subsurface Pacific waters were more than 8°C above average. El Niño itself is a natural climate cycle, but it is occurring atop unusually warm oceans and a human-warmed atmosphere. WMO forecasts increased probabilities of above-normal temperatures across almost all land regions from September through November, along with major rainfall shifts. Strong El Niños can increase risks of drought, flooding and extreme heat, although impacts vary substantially by region. (World Meteorological Organization)

Genome Doubling Fuels Evolutionary High-Risk Gambles: Duplicating an entire genome can give evolution an extraordinary supply of raw material—but also create severe biological instability. New research reviewed by Quanta is clarifying how organisms survive whole-genome duplication, a recurring event across plants, fungi and animals. Instead of two copies of each chromosome, organisms suddenly possess three, four or more, potentially disrupting gene dosage, reproduction and chromosome segregation. Yet duplicate genes also provide evolutionary freedom: one copy can preserve its original function while another accumulates mutations and develops something new. Studies of organisms including New Zealand freshwater snails are helping researchers understand why some duplicated genomes collapse while others fuel rapid adaptation and diversification. Whole-genome duplications appear repeatedly throughout evolutionary history, including in the ancestry of vertebrates, suggesting these risky genomic upheavals may have helped generate some of life’s biggest evolutionary innovations. (Quanta Magazine)

Damselfish Help Injured Corals Heal Faster: A coral-dwelling damselfish may function as an unlikely reef medic. Researchers studying yellowtail dascyllus found that wounded Pocillopora corals recovered substantially faster when the fish were present. Large injuries healed about 55 percent faster, while smaller wounds recovered about 38 percent faster. Corals without damselfish also showed reduced photosynthetic efficiency among their symbiotic algae, potentially depriving injured animals of energy needed for tissue repair. Previous research had suggested coral-dwelling fishes can clean wounds and improve coral tolerance to warming, but the new findings indicate their presence may directly accelerate tissue regeneration. The relationship underscores how coral health depends on ecological interactions extending beyond the coral animal and its microbial or algal partners. Conservation strategies aimed at restoring damaged reefs may therefore need to protect associated fish communities rather than treating corals as isolated organisms. (Conservation news)

Rocky Planets May Have Formed Almost Immediately: Rocky worlds may have appeared astonishingly early in cosmic history—perhaps only 100 million years after the Big Bang. Simulations suggest explosions of the universe’s first massive stars could have created localized pockets rich in carbon, oxygen, iron and dust, providing enough heavy material for planet formation far earlier than conventional estimates. Researchers modeled debris from a pair-instability supernova and watched it mix with primordial gas, collapse into a small star and form a surrounding dusty disk. Within that disk, rocky planetesimals emerged, including some at distances where liquid water could theoretically exist. The simulations do not demonstrate that planets—or life—actually formed, but they show the necessary ingredients could have assembled surprisingly quickly. Some such ancient planetary systems might conceivably survive today, potentially identifiable through their unusual chemical composition. (Science News)