Daily Science to all

👁️ Scientists Have Mapped the Wiring Behind Human High-Resolution Vision Researchers have created the first complete cell-by-cell and synapse-level wiring map of the human fovea — the pinhead-sized region of the retina that lets us read, recognize faces and see fine detail in color. The team reconstructed roughly 3,000 neurons and more than 300,000 connections, tracing how signals move through this tiny patch of nervous tissue. What they found was unexpectedly elegant: while much of the retina uses many overlapping pathways, the human fovea funnels visual information through just three major circuits. That streamlined architecture may be one reason human central vision is so precise. The researchers describe it as more like an expressway than a maze of side streets — sacrificing redundancy for speed and efficiency. The fovea is technically part of the central nervous system, which makes this the first complete connectivity map of a human CNS structure at this level of detail. Beyond basic neuroscience, the map could become a reference for treatments aimed at retinal diseases that destroy central vision. We often talk about the brain as the organ that “sees.” But the first stage of high-resolution vision may already be doing far more sophisticated processing than we realized. #Neuroscience #Vision #HumanBrain #Retina #Connectome #Science https://www.pnas.org/doi/10.1073/pnas.2603286123

🔴 A Rock From Mars Just Filled a 2-Billion-Year Hole in the Planet’s History Scientists have dated an unusual Martian meteorite to 1.273 billion years old — placing it almost exactly inside a huge missing chapter in our geological record of Mars. The meteorite, called NWA 13441, was discovered in Algeria in 2019. Most Martian volcanic meteorites of its type are either younger than about 600 million years or around 2.4 billion years old. Until now, researchers had essentially no samples from the enormous interval between them. But its age may not even be the strangest part. The rock’s neodymium isotopes suggest that the magma it formed from came from a portion of the Martian mantle that had remained remarkably untouched since the earliest days of the Solar System. Mars formed very quickly and, unlike Earth, has no active plate tectonics constantly remixing its interior — potentially allowing ancient chemical reservoirs to survive for billions of years. In other words, a small rock blasted off Mars by an impact and eventually found in the Sahara may contain a chemical fingerprint preserved from almost the beginning of the planet itself. How much of Mars’s earliest history could still be locked inside rocks already lying somewhere on Earth? #Mars #Space #Meteorite #PlanetaryScience #Geology #Science https://doi.org/10.1016/j.gca.2026.06.035

🛰 We May Be Building Satellite Constellations Too Large for Earth’s Orbit A new analysis suggests that some satellite megaconstellations could cross a dangerous threshold where collisions create debris faster than Earth’s atmosphere can remove it — potentially triggering a runaway increase in space junk. The study introduces the idea of a “critical size” for a satellite constellation. Above that point, even if individual satellites follow good disposal practices and actively avoid collisions, the constellation as a whole may still generate an unstable debris environment. The model found that several planned, partially deployed and existing constellations exceed that threshold under some assumptions. The scale of what is being proposed is enormous. The paper notes that the number of active satellites in low-Earth orbit increased by nearly 12,000 in just five years, while applications submitted to the U.S. FCC in 2026 included proposed constellations totaling more than 1.2 million satellites. That would be over 78 times the current operational satellite population cited by the study. The feared endpoint is related to the Kessler syndrome: one collision produces fragments, those fragments cause more collisions, and eventually parts of low-Earth orbit become increasingly difficult to use safely. The important caveat: this is a modelling study and currently a preprint, not peer-reviewed research. It does not predict that a catastrophic debris cascade is about to happen tomorrow. But it raises a bigger question: should regulators evaluate satellites one by one — or the cumulative risk of entire constellations? Space may be enormous. Useful orbit around Earth is not. #Space #Satellites #SpaceDebris #Astronomy #SpaceTech #Science https://arxiv.org/abs/2607.29644

📡 6G May Be Able to Detect People Through Walls — And Privacy Experts Are Alarmed The next generation of mobile networks won’t just transmit data. Under development for the 2030s, 6G is expected to integrate Integrated Sensing and Communication (ISAC) — a technology that combines wireless communications with radar-like sensing. According to Germany’s Data Protection Conference (Datenschutzkonferenz), ISAC could allow networks to detect people through walls and remotely measure breathing and heart rate. Combined with machine learning, the system may also identify individuals by analyzing their gait, gestures, posture, and even facial movements. The privacy concern is obvious: anyone within the network’s coverage could potentially be sensed, making meaningful user consent nearly impossible. Researchers at the Barkhausen Institut in Dresden are already working on countermeasures. Their proposed solutions include a hardware switch to disable sensing functions on compatible devices and a mobile app capable of detecting when surrounding space is being scanned. The concepts are expected to be presented at an international expert meeting in September 2026. Germany has invested around €700 million into 6G research, with commercial deployment widely expected around 2030. Source: https://www.datenschutzkonferenz-online.de/ and https://www.barkhauseninstitut.org #6G #ISAC #Privacy #Wireless #Technology #Science

👁️ Your Eyes May Have Evolved From an Ancient “Cyclops” Organ Every vertebrate eye — including yours — may trace its origins to a single light-sensitive organ that sat in the middle of the head of a distant ancestor nearly 600 million years ago. In a new Current Biology study, researchers from Lund University and the University of Sussex propose that an early worm-like ancestor lost its paired eyes after adopting a sedentary lifestyle. What remained was a simple median light-sensitive organ. Millions of years later, as its descendants became active swimmers, evolution may have repurposed this central organ to form the paired retinas of vertebrates. The same ancestral system also appears to have given rise to the pineal gland, which today regulates our circadian rhythms and melatonin production. If correct, this model could explain why vertebrate eyes are fundamentally different from those of insects and squid — and why the systems controlling vision and sleep may share a common evolutionary origin. One important caveat: this is an evolutionary reconstruction, supported by anatomy, developmental biology, and neuroscience, rather than the discovery of a fossil “cyclops.” 📄 Paper: https://www.cell.com/current-biology/fulltext/S0960-9822(25)01676-8 #Evolution #Biology #Vision #Neuroscience #Science

📊 The U-Curve of Happiness: Why Life Often Gets Better After 50 For decades, the “midlife crisis” was dismissed as little more than a cultural stereotype. But large-scale research suggests it reflects a real statistical pattern. Economist David Blanchflower (Dartmouth College) analyzed well-being data from 145 countries, controlling for income, education, employment, and marital status. Published in the Journal of Population Economics (2021), the study found a remarkably consistent U-shaped relationship between age and life satisfaction. Finding Detail 🌍 Scope 145 countries across Europe, Asia, Africa, and the Americas 📉 Lowest point Life satisfaction typically reaches its minimum in the late 40s (around age 47 in developed countries) 📈 Recovery Happiness generally rises again through the 50s and 60s, often returning to — or even exceeding — earlier levels 🔁 Consistency The U-shaped pattern appears across a wide range of cultures and economies, although its strength varies ⚖️ Controls Results remain after accounting for income, education, marital status, and employment Why might this happen? Several explanations have been proposed: • During midlife, expectations often collide with reality as career growth slows and responsibilities peak — raising children, caring for aging parents, and managing financial pressures. • Later in life, many people experience fewer competing demands, adjust their expectations, and become more emotionally resilient. • Neuroscience may offer part of the explanation as well. Separate studies suggest that older adults tend to respond less strongly to negative experiences and naturally focus more on positive ones — although this was not the primary focus of Blanchflower’s research. One important caveat: this is a population-level trend, not a prediction for any individual. Physical health, close relationships, financial security, and life events remain far more important determinants of happiness than age itself. Blanchflower’s analysis suggests that the U-shaped pattern of well-being is surprisingly widespread across countries, although its exact shape varies between populations. 📄 Source: Blanchflower D.G. Is happiness U-shaped everywhere? Age and subjective well-being in 145 countries. Journal of Population Economics (2021). DOI: 10.1007/s00148-020-00797-z #Psychology #Happiness #WellBeing #Science #Aging

🦷 Scientists May Have Found a Way to Regrow Tooth Enamel For decades, dentists have faced a frustrating reality: once tooth enamel is lost, it never naturally grows back. Researchers at the University of Nottingham may have found a way to change that. In a study published in Nature Communications, the team developed a protein-based biomaterial that mimics the way enamel forms during early childhood—the only time our bodies naturally produce it. Instead of simply coating the tooth like conventional treatments, the material acts as a microscopic scaffold. It penetrates tiny defects in damaged enamel, then recruits calcium and phosphate ions from saliva, guiding them to grow new enamel crystals that integrate seamlessly with the existing tooth. In laboratory tests on extracted human teeth, the regenerated enamel closely matched the natural material in both structure and mechanical performance. It also withstood simulated brushing, chewing, and repeated exposure to acidic conditions, suggesting it could be durable enough for everyday use. Unlike today’s fluoride treatments—which mainly slow further damage—this approach is designed to restore enamel rather than simply protect what’s left. The researchers have launched a startup, Mintech-Bio, to commercialize the technology and hope to bring the first products toward clinical use in the coming year. However, human clinical trials are still needed before the treatment can become widely available. If future trials confirm these results, dentistry could gradually shift from “drill and fill” to actually rebuilding damaged teeth. 📖 Source: Nature Communications (2025) https://www.nature.com/articles/s41467-025-64982-y #Dentistry #Biomaterials #Enamel #RegenerativeMedicine #Science

🌿 Ordinary Moss Produces Electrical Waves That Travel Across Its Tissue Moss may look like one of nature’s quieter creations. Electrically, however, it appears to be surprisingly active. Computer scientist Andy Adamatzky inserted electrodes into cushions of the common moss Brachythecium rutabulum and recorded their electrical activity continuously for 178 hours. The moss produced several distinct patterns: rapid spikes, slower rhythmic oscillations, and very slow depolarization waves. Some signals appeared first at one electrode and later at another, suggesting that electrical activity was travelling across the tissue rather than occurring everywhere simultaneously. Some spikes resembled action potentials and neuron-like spike trains. But resemblance is not equivalence: moss has no neurons, no brain, and the study provides no evidence that it thinks or possesses anything resembling consciousness. What it may show is that a moss cushion behaves as a distributed, electrically connected system. One day, such living networks could potentially be used in biohybrid sensors, responsive building materials, or unconventional computing. The interpretation remains preliminary. For now, the moss is not solving equations — but it may be coordinating electrical activity beneath our feet. Could future computers be partly grown rather than manufactured? 📄 Royal Society Open Science DOI: 10.1098/rsos.252341 #PlantBiology #Moss #BioComputing #LivingMaterials #UnconventionalComputing

💻 Classical Computers Just Overturned a Major Quantum Advantage Claim In 2025, researchers used D-Wave’s Advantage2 quantum annealer to simulate the dynamics of hundreds of interacting qubits — and argued that the task was beyond the reach of classical computers. A team from the Flatiron Institute and Boston University has now reproduced those results using classical algorithms and relatively modest hardware. Some of the initial calculations even ran on a personal laptop. The challenge involved quantum spin glasses: disordered systems in which hundreds of interacting qubits evolve across two- and three-dimensional lattices. Tracking the complete quantum wave function directly would require an amount of memory that grows exponentially with the number of qubits. The researchers avoided that explosion using tensor networks — mathematical structures that compress a quantum state by retaining its most important correlations. Think of it as a highly specialized zip file for quantum information. They combined tensor networks with belief propagation, an algorithm developed in the 1980s and recently adapted for quantum systems. The calculations were implemented using ITensor, a high-performance tensor-network software library. The classical simulations: • reproduced the quantum computer’s results • matched theoretical predictions and exact benchmarks • scaled to systems containing hundreds of qubits • captured quantum dynamics in complex 3D lattice geometries There is one important caveat: the entire study was not completed on an ordinary laptop. A laptop was sufficient for some early calculations, while the largest simulations required more powerful conventional processors and GPUs. Still, the result directly challenges the earlier claim that this particular problem was beyond classical computation. It does not mean quantum computers are useless. It means that demonstrating genuine quantum advantage requires beating the best classical algorithms available — not merely the best ones researchers happened to test previously. The boundary between classical and quantum computing is not fixed. Every improvement in quantum hardware gives classical researchers a new target, while every better classical algorithm raises the bar for quantum advantage. Sometimes the strongest competitor to a quantum computer is not another quantum computer. It is better mathematics. 📄 Paper: Dynamics of disordered quantum systems with two- and three-dimensional tensor networks https://www.science.org/doi/10.1126/science.adx2728 #QuantumComputing #Physics #TensorNetworks #ClassicalComputing #QuantumPhysics

Elon Musk predicts that programming will "die" by the end of the year due to AI. @science

🧬 Semaglutide May Slow Biological Aging, First Randomized Human Evidence Suggests GLP-1 drugs such as semaglutide are already well known for treating obesity and type 2 diabetes. Now, researchers at UC San Diego report the first randomized placebo-controlled evidence that the drug may also slow biological aging — at least as measured by epigenetic aging clocks. The team analyzed DNA methylation data from a 32-week, double-blind clinical trial involving 108 adults with HIV-associated lipohypertrophy. Participants received either weekly semaglutide injections or placebo. Researchers then used multiple epigenetic clocks — molecular biomarkers that estimate biological aging from chemical modifications to DNA — to evaluate changes in aging rate. The results, published in Nature Communications, showed that semaglutide significantly slowed several independent measures of biological aging. On the DunedinPACE clock, the pace of aging slowed by about 9%. Significant improvements were also observed with the PCGrimAge clock, which is associated with mortality and age-related disease risk. A separate 24-week pilot study in people with HIV and fatty liver disease reported that about 42% of participants showed a reduction in DunedinPACE after semaglutide treatment, although that study had no placebo control and should be interpreted cautiously. In simple terms: epigenetic clocks don’t measure your chronological age. They estimate how quickly the molecular processes associated with aging are progressing. A 9% reduction means these biomarkers changed more slowly during treatment — not that people became 9% younger. Scientists think several mechanisms may contribute. Semaglutide reduces chronic inflammation, decreases harmful visceral fat, and improves metabolic health — all processes linked to accelerated aging. These changes may influence molecular pathways involved in aging across multiple organ systems. Key findings: • ~9% slower pace of aging on the DunedinPACE clock • Significant improvement in the PCGrimAge mortality-risk clock • Similar effects across several independent epigenetic aging clocks • A separate pilot study found ~42% of participants showed slower epigenetic aging after treatment The study also has important limitations. This was a post hoc exploratory analysis, not a trial originally designed to study aging. Participants all had HIV-associated lipohypertrophy, a condition associated with accelerated biological aging, so the findings cannot yet be generalized to healthy individuals. Most importantly, improvements in epigenetic clocks do not prove that semaglutide extends lifespan or healthspan. Those questions will require much longer clinical studies. Why it matters: Tens of millions of people already take GLP-1 drugs worldwide. If future studies confirm these findings in broader populations, semaglutide could become one of the first widely used medications shown to influence molecular biomarkers of human aging — extending its impact far beyond weight loss. 📄 https://www.nature.com/articles/s41467-026-72861-3 #Longevity #Semaglutide #GLP1 #Aging #Healthspan

🌌 We @science May Have Finally Figured Out Why the Universe Is Expanding… The explanation is surprisingly simple. Large language models operate using tokens. Every time a model generates a new response, it processes the accumulated context of the conversation. As the dialogue grows, each new message adds more information — while the model must repeatedly process everything that came before. The total amount of processed information therefore grows almost geometrically within every conversation. Now imagine that the Universe is actually one enormous artificial intelligence. Every new star, planet, living organism, human thought, cat video, and online argument adds more tokens to the global conversation. The context keeps growing in geometric progression, so the system needs more and more space to process it all. That is why the Universe is expanding. Dark energy may have nothing to do with it. Someone simply forgot to click “Start a new chat.” 😅 #science #space #universe #AI

🌊 Scientists Find Why Some Animals Survived Earth’s Worst Mass Extinction About 252 million years ago, the Permian–Triassic extinction erased most marine species and permanently reshaped life in the oceans. A new Stanford-led study suggests that survival depended partly on how animals’ oxygen requirements changed as the water warmed. Researchers measured oxygen consumption in living brachiopods and other animals representing the “Paleozoic” and modern marine faunas. At cooler temperatures, brachiopods could tolerate remarkably low oxygen levels. But as the water warmed, the minimum amount of oxygen they needed rose much faster. Their slow metabolism was not the problem by itself. More active groups generally had muscles, gills and respiratory systems better able to supply additional oxygen under heat stress. This may explain why brachiopods and crinoids were devastated, while bivalves, snails, fish and echinoderms suffered fewer losses and later came to dominate the oceans. The extinction was therefore not completely random — but metabolism was not the only factor either. Warming and ocean deoxygenation acted through animals’ physiology, alongside stresses such as acidification. Modern oceans are also warming and losing oxygen. The study does not predict another “Great Dying,” but it shows how strongly climate can favour some body plans over others. Could the next reshuffling of ocean life be determined by which animals can keep breathing as the water heats up? 📄 Study: https://www.pnas.org/doi/10.1073/pnas.2533086123 #Paleontology #MassExtinction #MarineBiology #OceanWarming #ClimateChange

🤖 NEO Just Got New Hands 25 degrees of freedom. Still far from matching the human hand, of course — but the progress is impressive. The company calls them an “API to the physical world.” https://www.1x.tech/discover/neos-hands #Robotics #NEO #RobotHands #gadget #science

🐸 A Frog Gut Bacterium Eliminated Colorectal Tumors in Mice A bacterium found in the gut of Japanese tree frogs has shown a striking anti-cancer effect in mice. Researchers at the Japan Advanced Institute of Science and Technology (JAIST) screened 45 bacterial strains isolated from amphibians and reptiles, including Japanese tree frogs, fire belly newts, and grass lizards. One strain stood out: Ewingella americana, a naturally occurring bacterium from the intestines of the Japanese tree frog. In a mouse model of colorectal cancer, a single intravenous dose of E. americana led to complete tumor elimination in all treated mice — a 100% complete response rate in that experiment. The bacterium appears to work in two ways. First, it accumulates inside tumors, where oxygen levels are low and blood vessels are unusually leaky. Once there, the bacterial population increased by roughly 3,000 times within 24 hours, directly damaging cancer cells. Second, it seems to wake up the immune system. The treatment attracted T cells, B cells, and neutrophils into the tumor and boosted inflammatory signals such as TNF-α and IFN-γ, helping the body attack the cancer more aggressively. The safety data in mice were also encouraging. The bacteria disappeared from the bloodstream within 24 hours, did not colonize healthy organs such as the liver, spleen, lungs, kidneys, or heart, and caused only temporary mild inflammation. Over a 60-day observation period, the researchers reported no chronic toxicity. But the caveat is essential: this is still mouse research. Many cancer therapies look spectacular in preclinical models and fail later in humans. A living bacterium injected into the bloodstream would face a much higher safety bar in people, and the human immune response could be very different. Still, the study is an unusually strong proof of concept for bacterial cancer therapy. Instead of simply changing the gut microbiome, the researchers used a living bacterium as a tumor-targeting agent — one that both attacks cancer cells and recruits the immune system. The big takeaway: one of the next ideas in cancer therapy may come not from a synthetic drug library, but from the gut of a frog. Original paper, Gut Microbes: https://www.tandfonline.com/doi/full/10.1080/19490976.2025.2599562 DOI: https://doi.org/10.1080/19490976.2025.2599562 ScienceDaily summary: https://www.sciencedaily.com/releases/2026/07/260709160655.htm JAIST press release: https://www.jaist.ac.jp/english/whatsnew/press/2025/12/17-1.html #CancerResearch #Microbiome #Immunotherapy #Biotech

🧬 Harvard Built a Silicon Chip That Can Write DNA Using Electricity and Water Writing custom DNA has barely changed in decades. Today’s DNA synthesis relies on phosphoramidite chemistry—a highly effective but solvent-intensive process that depends on hazardous chemicals and specialized manufacturing facilities. Researchers at Harvard have now demonstrated a completely different approach: parallel enzymatic DNA synthesis on a semiconductor chip, controlled simply by electricity in water. The CMOS chip contains 64 programmable synthesis sites, each surrounded by two concentric ring electrodes. When current flows through the inner ring, it generates protons that create a tiny acidic region—exactly what’s needed to remove the temporary blocking group from a growing DNA strand. At the same time, the outer ring consumes escaping protons, preventing neighboring reactions from interfering with one another. Using this approach, the team synthesized 64 different DNA sequences, each 38–39 nucleotides long, entirely in an aqueous enzymatic process. Previous demonstrations of parallel enzymatic DNA synthesis were limited to roughly a dozen sequences, making this the largest demonstration of its kind so far. The hardware has an unusual history. It was originally developed for recording electrical activity from thousands of neurons. The researchers later realized that the same ability to precisely control microscopic electrical currents could also be used to control chemical reactions needed for DNA synthesis. Key points: • 64 unique DNA sequences synthesized in parallel • Water-based enzymatic process instead of traditional solvent-heavy chemistry • Precise local pH control using dual concentric electrodes • DNA strands up to 39 nucleotides long • Demonstrated storage of a 169-byte text message in the synthesized DNA The technology is still at an early stage. DNA strands of 39 nucleotides are far shorter than real genes, which typically contain thousands of bases. According to the researchers, the main limitation is now the chemistry used to remove temporary protecting groups—not the chip itself—suggesting that future advances may come from improved chemistry rather than new electronics. If the method can be scaled, it could eventually make DNA manufacturing cleaner, cheaper, and more accessible for synthetic biology, diagnostics, gene therapies, and even DNA-based data storage, one of the highest-density storage media ever proposed. 📄 Nature Electronics: https://www.nature.com/articles/s41928-026-01662-9 🏛 Harvard SEAS: https://seas.harvard.edu/news/making-dna-semiconductor-chip #DNA #SyntheticBiology #Biotechnology #Semiconductors #DataStorage

⏳ Scientists Found a Way to Make Quantum Time Look Like It Runs Backward At our everyday scale, time has a clear direction. Eggs break, coffee cools, and no one has ever un-spilled a glass of water. But at the quantum scale, the story is stranger. Many fundamental equations work just as well forward or backward in time. The arrow of time appears when a system is measured — because measurement randomly disturbs its state. Now researchers from Los Alamos National Laboratory, NIST, and the University of Maryland have developed a theoretical control method that can reshape that arrow. Their idea is based on a “control Hamiltonian” — a precisely designed sequence of fields and pulses that mimics and counteracts the random disturbance caused by quantum measurement. With the right feedback, the system’s trajectory can be made to look as if it is moving backward rather than forward. To be clear: this is not a time machine. No one reversed time for people, objects, or the universe. The work shows that, in a monitored quantum system, the appearance of time’s direction can be weakened, blurred, or even inverted. The team also used the framework to design a quantum version of Maxwell’s demon — a measurement-powered engine that could, in principle, extract useful energy from the act of observation itself. That energy might one day help drive quantum processes or be stored in a quantum battery. The caveat: this is still mostly a theoretical result. Experimental tests are planned for superconducting qubits, where fast feedback and quantum Maxwell’s demon setups are already technically plausible. Why it matters: better control over quantum measurement could help with quantum state preparation, more stable quantum computers, and new ways to manage energy at the smallest scales. The big takeaway: the arrow of time may feel absolute in daily life — but in the quantum world, it can become something engineers may learn to control. 📄 Original paper: https://link.aps.org/doi/10.1103/l18s-9vmh 📖 Los Alamos summary: https://www.lanl.gov/media/news/0319-reshaping-quantum-arrow 📖 ScienceDaily summary: https://www.sciencedaily.com/releases/2026/06/260625014802.htm #QuantumPhysics #ArrowOfTime #QuantumComputing #Physics