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ear olivier hartmanshenn,

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Here is your customized Science X Newsletter for week 51: Roman soldiers defending Hadrian's Wall were infected by parasites, study finds Analysis of sediment from Vindolanda, a Roman fort near Hadrian's Wall, identified roundworm, whipworm, and Giardia duodenalis, indicating intestinal parasite infections among soldiers. These findings suggest that sanitation measures were insufficient to prevent fecal-oral transmission, leading to health issues such as diarrhea and malnutrition, and represent the earliest evidence of Giardia in Roman Britain.   2.8 days to disaster: Why we are running out of time in low earth orbit Satellite mega-constellations in low Earth orbit experience close approaches every 22 seconds, with each satellite performing frequent avoidance maneuvers. Solar storms increase atmospheric drag and can disable satellite control systems, raising collision risks. If operators lose control, a catastrophic collision could occur within 2.8 days, compared to 121 days in 2018, highlighting increased vulnerability.   Italian bears living near villages have evolved to be smaller and less aggressive, finds study Italian Apennine brown bears living near villages have evolved to be smaller and less aggressive, with genomic evidence indicating reduced diversity, higher inbreeding, and selection for behavior-related genes. These changes are linked to long-term human influence, highlighting both increased extinction risk and the evolution of traits that reduce human-wildlife conflict.   Ancient hunter-gatherer DNA may explain why some people live to 100 years or more Italian centenarians possess a higher proportion of Western Hunter-Gatherer (WHG) DNA compared to the general population. Increased WHG ancestry is associated with greater odds of reaching 100 years, especially in women. This ancient genetic component may enhance metabolism and immune function, potentially contributing to longevity.   Beachy Head Woman's origin story: DNA analysis reveals she was local to southern Britain Genetic analysis of the Beachy Head Woman, a Roman-era individual from southern England, indicates she descended from the local British population rather than sub-Saharan Africa or the Mediterranean. Radiocarbon dating places her death between 129 and 311 AD. Isotope analysis suggests a seafood-rich diet, and skeletal evidence shows she survived a serious leg injury.   Private donors pledge $1 billion for world's largest particle accelerator Private donors have pledged $1 billion to support the construction of the Future Circular Collider (FCC) at CERN, which would surpass the current Large Hadron Collider in size and capability. The FCC, planned as a 91 km ring, aims to investigate the 95% of the universe composed of dark matter and dark energy, with an estimated total cost of $17 billion and a decision expected in 2028.   International report reveals atmospheric impact of Hunga eruption The 2022 Hunga eruption increased global stratospheric water vapor by about 10%, much of which persists into 2025, and caused stratospheric cooling rather than warming. Its effects on the Antarctic ozone hole and surface climate were minor. The eruption’s water vapor will influence stratospheric chemistry and dynamics for several years, but did not contribute to recent record global warming.   Bazinga! Physicists crack a 'Big Bang Theory' problem that could help explain dark matter Theoretical work demonstrates that axions, hypothetical particles considered a candidate for dark matter, could be produced in fusion reactors using deuterium, tritium, and lithium. Neutron interactions with reactor walls and bremsstrahlung processes may generate axions or axion-like particles, offering a new approach to probing dark matter beyond solar-based searches.   Hidden threats in the dark: Alarming levels of human-made debris in Mediterranean sea caves Surveys of Mediterranean sea caves in Cyprus reveal high concentrations of human-made debris, with up to 97 items/m2, predominantly plastics. These caves act as natural traps, accumulating litter that poses risks to endangered species like the Mediterranean monk seal. Plastitar, a tar–plastic contaminant, was also found. The findings highlight the need for targeted conservation and expanded monitoring.   Quality of carbohydrates in diet may play key role in prevention of dementia Lower dietary glycemic index is linked to reduced dementia risk, while higher glycemic index increases risk. Diets with low to moderate glycemic index are associated with a 16% lower risk of Alzheimer's, whereas high glycemic index diets show a 14% increased risk. Emphasizing carbohydrate quality may help prevent cognitive decline and dementia.   Changing the paradigm on hypermobile Ehlers-Danlos Syndrome: Connective tissues don't tell the whole story Hypermobile Ehlers-Danlos Syndrome (hEDS) involves not only connective tissue abnormalities but also significant immune system dysfunction. Genetic and proteomic analyses reveal links between hEDS and immune pathways, including inflammation, complement, and mast cell activation. These findings suggest immune dysregulation may underlie hEDS, with connective tissue symptoms as downstream effects.   Sourdough starters: How flour choice shapes microbial communities The dominant yeast in sourdough starters is consistently Kazachstania, regardless of flour type, while bacterial composition varies with the flour used. Whole wheat flour favors Companilactobacillus, and bread flour favors Levilactobacillus. Flour choice influences the microbial community, potentially affecting bread characteristics such as flavor and texture.   Could cheese protect your brain health? Study links high-fat cheese and cream to lower dementia risk Higher intake of high-fat cheese and cream is associated with a lower risk of developing dementia, including a 13% reduced risk for high-fat cheese and a 16% reduced risk for high-fat cream. The association was stronger for vascular dementia and for Alzheimer's disease in individuals without the APOE e4 gene variant. No similar associations were found for other dairy products.   The moon-forming event: Why it was by explosive ejection rather than a giant impact A new model proposes that the Moon formed from explosive ejection of Earth's mantle and crust, driven by accumulated internal gravitational energy (LɅ) released at the core-mantle boundary, rather than by a giant impact. This mechanism explains the Moon's isotopic similarity to Earth and links geophysical processes, such as mantle plumes and LLVPs, to lunar formation.   Scientists identify first non-coding gene that controls cell size A long non-coding RNA gene, CISTR-ACT, has been identified as a direct regulator of cell size, acting through both DNA and RNA mechanisms. CISTR-ACT influences genes involved in cell growth and structure, partly by guiding the protein FOSL2. Modulating CISTR-ACT levels alters cell size across cell types, suggesting conserved and therapeutically relevant functions.   Rare, deep-sea encounter: Scientists observe 'extraordinary' seven-arm octopus A rare deep-sea encounter captured footage of the seven-arm octopus, Haliphron atlanticus, at 700 meters depth in Monterey Bay. This species, with females reaching up to 4 m and 75 kg, primarily inhabits the ocean's twilight zone and feeds on gelatinous animals such as jellyfish, supporting previous observations of its unusual diet.   Conventional entanglement can have thousands of hidden topologies in high dimensions Entangled photons generated via spontaneous parametric downconversion exhibit hidden high-dimensional topologies, with observations reaching 48 dimensions and over 17,000 distinct topological signatures. These topologies, accessible through orbital angular momentum (OAM) alone, provide a large, robust encoding space for quantum information, potentially enhancing noise immunity in quantum systems.   Video: Lunar impact flash detected on the moon by Armagh Observatory and Planetarium A brief flash on the moon’s night side, consistent with a small meteoroid impact, was recorded on 12 December 2025 during the Geminid meteor shower. The impactor, likely smaller than a golf ball and traveling at about 35 km/s, produced a short-lived flash as its kinetic energy was converted to heat and light upon striking the lunar surface.   Urban birds' beak shape rapidly changed during COVID-19 lockdowns, suggesting human-driven transformations During the COVID-19 lockdowns, urban dark-eyed juncos developed longer, thinner beaks resembling their wild counterparts, likely due to reduced human food waste. As human activity resumed, beak shapes reverted to the shorter, thicker form typical of urban birds. These rapid, reversible changes highlight the strong influence of human presence on urban bird morphology.   Ants may hold solution to human superbug, researchers discover Ants produce multiple classes of antimicrobial compounds, some of which are targeted to specific pathogens such as fungi, gram-negative, and gram-positive bacteria. Extracts from several ant species were effective against the drug-resistant human pathogen Candida auris. These findings indicate ants may be a valuable source of novel antibiotics for combating superbugs.