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Science X Newsletter

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Here is your customized Science X Newsletter for week 40: New weight-loss injection targets fat cells: CBL-514 selectively induces apoptosis of fat cells CBL-514 induces fat-cell apoptosis and reduced subcutaneous fat in phase 2 trials. In an MRI subgroup (n=40), visceral fat fell 10.45% versus an 11.76% increase with placebo at 8–12 weeks after treatment; adverse effects were mainly transient injection-site reactions. Reduced weight regain after tirzepatide withdrawal was observed only in rats.   International study identifies key childhood experiences that predict happiness and well-being in adulthood Among adults aged 18–34 in the UK, US and Japan, recalled responsive caregiving, free play and a positive home climate were associated with better well-being, lower anxiety and stronger social connectedness. Associations persisted after demographic adjustment; positive childhood experiences generally predicted well-being more strongly than the absence of negative experiences.   Night owls may struggle to continue working until official retirement age In a Finnish cohort followed for 12 years from age 46, evening chronotypes were 1.7 times more likely than morning chronotypes to receive a disability pension. The association persisted after adjustment for socioeconomic factors, but the observational data cannot establish causation.   Nail detachment over four times more common among GLP-1 users, first controlled study finds GLP-1 receptor agonist users reported more nail detachment (39% vs 9%), nail discoloration (46% vs 17%) and hair loss (50% vs 34%) than controls with obesity or type 2 diabetes. Associations with nail detachment and discoloration weakened but persisted after adjustment. Cross-sectional, self-reported data cannot establish causation.   Promising therapy for fatty liver disease reduces fat, inflammation, and scarring in preclinical models MAP4K4 activity increased as metabolic dysfunction-associated steatohepatitis (MASH) progressed. In preclinical models, the experimental MAP4K4 inhibitor GPPD reduced liver fat, inflammation, injury and fibrosis without significant toxicity detected so far. Its effects in humans remain untested.   Hearing aids show promise for cognitive recovery, but dementia prevention remains unproven In a two-year randomized trial of 703 adults with moderate-to-severe hearing loss and mild cognitive impairment, hearing aids increased recovery to normal cognitive scores (15.34% vs 2.36% with health education). Dementia progression was 3.09% versus 4.74%, a statistically nonsignificant difference. Dementia prevention remains unproven.   Resistance gene helps C. difficile spores survive hospital-grade disinfectants An acquired antibiotic resistance gene allows Clostridioides difficile to keep forming spores despite antibiotics by replacing a key spore-building protein. These spores also withstand hospital-grade disinfectants and high laundry temperatures, complicating infection control.   Fluctuations in blood pressure over time linked to death and strokes, analysis of UK data finds Among 57,611 UK adults, greater blood pressure variation between visits was associated with higher mortality after accounting for average blood pressure. Greater variation in diastolic and mean arterial pressure was also associated with stroke, but no significant association with dementia was detected. The observational analysis cannot establish causality.   An omega-3 paradox: When 'healthy fats' shut down defenses against cancer In preclinical colon cancer models, polyunsaturated fatty acids suppressed natural killer cell antitumor activity through LRP5-mediated uptake. Blocking LRP5 or removing these fats from the diet slowed tumor growth and improved checkpoint inhibitor efficacy in mice. Effects on human cancer outcomes remain unestablished.   A new family of materials for efficiently converting sunlight into clean energy The metal-organic framework BVR-19 uses light-responsive sulfur-containing linkers to drive hydrogen production from water without an additional metal catalyst. It forms in aqueous solution at room temperature, and changing its metal component alters photocatalytic performance, offering guidance for designing solar-hydrogen materials.   A weekly session of isometric exercise training may maintain lower blood pressure In adults without hypertension, four weeks of wall squats three times weekly reduced blood pressure. Over the next four weeks, one or two weekly sessions maintained reductions in systolic pressure, while three sessions produced the largest reduction. Blood pressure returned toward control levels after exercise stopped; longer-term effects remain uncertain.   Physicists identify 'octupolar' magnetism, with implications for quantum technologies Octupolar magnetic order can impart distinct handedness to lattice vibrations, producing “pseudo-chiral” phonons with optical signatures detectable using circularly polarized light. These signatures provide a probe of hidden magnetic order that conventional techniques struggle to detect.   What happens in the brain when cannabis generates anxiety? In mice exposed to predator odor, a synthetic cannabinoid increased freezing and avoidance by reducing inhibition of somatostatin neurons in the central amygdala. Genetically silencing these neurons reduced drug-induced avoidance, implicating this circuit in cannabinoid-related anxiety under stress.   How bumblebees keep up with a flower that won't stay still Bumblebees landing on a sideways-moving platform matched its motion with a delay, banking to accelerate laterally. Models combining visual motion with the bees’ turning rate reproduced their tracking and steering; visual motion alone could initiate turns toward the target. The experiments used only regular, predictable motion and did not identify how bees sense their turning rate.   How NASA's Nancy Grace Roman Space Telescope will open a window into the Milky Way The Nancy Grace Roman Space Telescope will combine sharp, wide-field images with repeated observations to track changes across the sky. Its Milky Way survey will use microlensing and transits to detect planets and other objects, while changes in starlight will reveal stellar rotation and activity. A separate survey will monitor distant events, including supernovae.   After 20 years, jet diffusion wakes detected in quark-gluon plasmas Jet diffusion wakes were detected in quark–gluon plasma produced in lead–lead collisions. Statistical analysis of millions of collisions isolated the weak wake signal from large-scale background fluctuations, confirming a prediction made two decades earlier.   Engineered coating lets mitochondria retain their ability to produce energy Mitochondria coated with small amounts of metal-organic framework material retained their ability to produce energy. Whether the coating improves mitochondrial transplantation or other applications remains untested.   Ancient bird becomes second Australian species to be named from the Cretaceous period Two isolated leg bones from the 105-million-year-old Toolebuc Formation in Queensland have been assigned to Tenuicruris piscanexum, Australia’s second named Cretaceous bird. The bones place it among enantiornithines and distinguish it from Nanantius eos, adding to the sparse record of birds in Australia’s Cretaceous inland-sea ecosystem.   Hidden 'funnels' let complex systems slip between stable states Models of multistable systems with fast and slow dynamics contain narrow “singular funnels” extending their basins of attraction. These pathways shrink as timescale separation increases but persist at finite speeds, allowing outcomes missed by simplified models and limiting their predictions of resilience and tipping.   Pre-exercise caffeine enhances repeated sprint performance for at least 3.5 hours In 12 healthy young adults, caffeine (5.5 mg/kg) taken before exercise increased mean and peak repeated-cycling-sprint power for at least 3.5 hours after ingestion. It also increased post-sprint plasma noradrenaline, reduced perceived exertion and leg pain, and lowered middle cerebral artery blood velocity.

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