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Science X Newsletter

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Here is your customized Science X Newsletter for week 21: Common food preservatives linked to high blood pressure and heart disease High intake of common food preservatives, particularly non-antioxidant types, is associated with increased risks of hypertension (up to 29%) and cardiovascular disease (up to 16%). Eight specific preservatives, including potassium sorbate and ascorbic acid, were linked to higher blood pressure, with ascorbic acid also linked to cardiovascular disease. These findings support recommendations to limit processed foods and unnecessary additives.   Debunking a core chemistry concept taught in classrooms everywhere Modern computational modeling indicates that the traditional inductive effect explanation for electron behavior in molecules, widely taught in chemistry, does not align with current evidence in key cases. A revised, simpler, and more consistent framework is proposed to enhance chemistry education and provide a clearer basis for understanding molecular behavior.   White hydrogen discovered in billion-year-old Canadian Shield rock points to potential new energy source Natural hydrogen accumulates in billion-year-old rocks of the Canadian Shield, with direct measurements showing sustained releases from boreholes, potentially totaling over 140 metric tons annually at a single site. This resource could provide significant local energy, reduce reliance on hydrocarbon-based fuels, and lower carbon emissions, offering a cost-effective, cleaner alternative to industrial hydrogen production.   Data centers raise nearby temperatures by up to 4 degrees in Phoenix Waste heat from data centers in the Phoenix metro area increases downwind neighborhood air temperatures by an average of 1.3–1.6°F, with peaks up to 4°F, detectable up to a third of a mile away. This localized warming, driven by air-cooled condenser emissions, may exacerbate urban heat islands and public health risks, especially as data center capacity expands. Design and planning interventions could mitigate these thermal impacts.   Lost elephant calf reunites with family after researchers track herd across Samburu reserve A lost 4-month-old elephant calf was successfully reunited with her family in Samburu National Reserve after researchers identified her herd using long-term monitoring and behavioral cues. The reunion highlighted elephants' strong social bonds and complex behaviors, including caregiving by aunts after the mother's death. Ongoing research tracks elephant movements, vocalizations, and habitat use to inform conservation strategies amid increasing habitat loss and human-elephant conflict. Maintaining landscape connectivity and understanding elephant social structures are critical for species survival.   Quantum supremacy just ran into an unexpected rival: An ordinary laptop armed with new math Advanced tensor network algorithms and belief propagation methods enabled classical computers, including personal laptops, to efficiently simulate complex quantum systems previously thought solvable only by quantum computers. These approaches achieved state-of-the-art accuracy for hundreds of interacting qubits, challenging claims of quantum supremacy and expanding the potential of classical computational methods in quantum physics.   Why meat-eating dinosaurs like T. rex evolved tiny arms Shortened forelimbs in large theropod dinosaurs, including T. rex, are closely associated with the evolution of robust skulls and powerful jaws, rather than overall body size. This adaptation likely reflects a shift to using the head as the primary predatory tool, especially for subduing large prey, with different groups achieving reduced forelimbs through varied developmental pathways.   A new way to recharge aging muscle stem cells by restoring a key metabolic component Aging muscle stem cells exhibit reduced glutaminase (GLS1) levels, impairing glutamine metabolism and fatty acid synthesis essential for muscle repair. Restoring GLS1 or supplementing fatty acids reactivates aged stem cells, leading to larger muscle fibers and improved function in mice. These results suggest targeting glutamine metabolism may rejuvenate muscle regeneration in aging.   Ancient seas get a new T. rex as massive mosasaur emerges from Texas fossils A new species of mosasaur, Tylosaurus rex, has been identified from 80-million-year-old Texas fossils, reaching lengths up to 43 feet and exhibiting features such as finely serrated teeth and robust jaw and neck musculature, indicating a powerful predatory lifestyle. This species is distinct from Tylosaurus proriger and shows evidence of intraspecific aggression. The findings prompt a revision of mosasaur evolutionary relationships using updated datasets.   New insights into how the human hand evolved from our ape-like ancestors Analysis of fossil and modern primate wrist bones indicates that the human wrist retains strong anatomical similarities to African apes, supporting a shared knuckle-walking ancestor. Gradual evolutionary changes, particularly on the thumb side of the wrist, enabled the emergence of advanced manipulative abilities in later Homo species, facilitating tool use.   Sea levels rising dramatically in some areas due to land subsidence Relative sea-level rise in densely populated coastal regions averages about 6 mm per year, nearly three times the global coastline mean, primarily due to land subsidence from groundwater extraction, resource use, and urbanization. Subsidence rates can reach up to 42 mm per year in some city areas, intensifying flood risks. Improved groundwater management can significantly reduce subsidence and mitigate relative sea-level rise.   Scientists improve knowledge on sea level rise—and confirm it has been accelerating since 1960 Global average sea level has risen by 2.06 mm per year since 1960, with the rate doubling to 3.94 mm per year from 2005 to 2023. Ocean warming is the largest contributor, accounting for 43% of the rise, followed by reduced land water storage and, more recently, accelerated ice loss from glaciers and ice sheets. Improved measurement techniques now fully account for observed sea level rise. Ongoing ocean warming and ice melt will drive continued sea level rise for centuries, even if greenhouse gas emissions stabilize.   For real heart protection, the weekly exercise number climbs far beyond current advice Achieving substantial cardiovascular risk reduction requires 560–610 minutes per week of moderate to vigorous physical activity, significantly exceeding current recommendations of 150 minutes. Individuals with lower cardiorespiratory fitness need 30–50 minutes more exercise weekly than those with higher fitness to obtain similar benefits. Current guidelines provide a minimum threshold, but personalized targets based on fitness levels may optimize heart protection.   Sea level rise is swallowing US Mid-Atlantic farmland faster than expected, study finds Sea level rise in the US Mid-Atlantic is causing marshes to encroach on farmland nearly twice as fast as previously estimated, with agricultural land up to seven times more vulnerable than forests. Despite local mitigation efforts, approximately 25,000 acres of farmland were lost between 1984 and 2022, as saltwater intrusion outpaces protective measures. Farmland's lower biological resilience and limited new flood infrastructure contribute to its heightened vulnerability, impacting both agricultural productivity and coastal ecosystem dynamics.   Discovery of new fossils in Northwest Canada changes view of early animal evolution Newly discovered Ediacaran fossils in Northwest Canada extend the known timeline of animal movement and sexual reproduction by 5–10 million years and represent the first North American evidence of the White Sea assemblage. The site reveals over 100 fossils, including six groups previously unrecorded in North America, and indicates early animals inhabited deeper marine environments, suggesting evolutionary innovation began offshore before spreading to shallower waters.   Consistency check casts doubt on evolving dark energy A consistency check between supernova and baryon acoustic oscillation datasets reveals a minor mismatch with the cosmic distance duality relation, which correlates with deviations in the inferred dark energy equation of state from a simple cosmological constant. This suggests that recent claims of evolving dark energy may be affected by subtle systematic errors, indicating it is premature to assert robust evidence for dynamical dark energy.   AI-generated fake citations are flooding scientific literature across publications, scientists warn An audit of 2.5 million scientific papers identified approximately 146,900 AI-generated fake citations in 2025 alone, with a sharp increase from mid-2024. Hallucinated references appeared across major repositories, disproportionately credited prominent and male scholars, and were most common among early-career researchers and small teams. Existing editorial safeguards failed to catch most errors, raising concerns about the reliability and equity of scientific literature.   Behold the neuron, a complicated cell with a simple mission Analysis of neuronal activity in mice and C. elegans indicates that most individual neurons function primarily as simple on-off switches, with 90% of mouse neuron activity and 60–70% of worm neuron activity involving basic one input-one output interactions. This supports early neuron models and suggests that, despite complex connectivity, individual neuron behavior is fundamentally simple.   Microbes for health: New way to feel 'at one' with nature Exposure to the holobiont concept, which frames humans as ecosystems hosting trillions of microbes, significantly increases individuals' sense of connectedness to nature. This enhanced nature connectedness, achieved through brief educational interventions, is associated with improved well-being and greater environmental concern, paralleling effects seen with direct nature-based experiences.   Overpopulation can impair fertility. A new study explains why Overcrowding in animals triggers secretion of a cysteine protease enzyme (CPR-4/Cathepsin B), which damages DNA in germ cells, increases genetic mutations, reduces fertility, and causes developmental defects in offspring. These mutations can be inherited across generations. Silencing the enzyme prevents these effects, indicating its central role in crowding-induced reproductive impairment. Implications for humans remain to be determined.