Science X Newsletter

Dear olivier hartmanshenn,

Here is your customized Science X Newsletter for week 36:

	Scientists observe Einstein's gravity in the quantum world An atom interferometer measured the quantum phase difference between ultracold rubidium atoms in free fall and atoms held stationary against gravity. The phase agreed with predictions based on Einstein’s equivalence principle, supporting its consistency with quantum mechanics in this regime. The result does not demonstrate quantum gravity or unify gravity and quantum theory.

	Physicists finally put Feynman's path integral to the test A single-photon experiment reconstructed probability amplitudes for 1,419,857 possible paths. The measured amplitudes supported path-integral predictions: observable probabilities arise from interference among paths with equal magnitude and phases determined by classical action.

	Gut bacteria linked to key brain chemicals in first-of-its-kind human study In 61 healthy young women, gut microbial metabolic gene pathways were associated with GABA, glutamate, and excitatory/inhibitory balance in region-specific brain patterns. Pathways also correlated with anxiety, depressive symptoms, and sleep quality. Cross-sectional data show associations, not causation or direct metabolite production.

	Diabetes drug metformin could be repurposed to help slow aging mechanisms Metformin activates energy-stress pathways, autophagy, DNA-stability mechanisms, and microbiome changes implicated in aging. Animal and observational human data suggest possible health-span benefits, but results are inconsistent and confounded by diabetes. Large randomized trials in healthy adults are needed to establish efficacy.

	Smart walker boosts walking efficiency and dynamic balance in older adults In 30 older adults with mild balance impairment, a smart wheeled walker increased walking speed, reduced physiological cost, and improved Expanded Timed Up and Go performance versus a conventional rollator. Fear of falling did not differ significantly. Long-term home-based evaluation is needed to assess safety, adherence, and fall prevention.

	Low-dose THC keeps breast cancer cells in tumor models from reverting to an aggressive state Brief low-dose THC or CB2R inhibition in mouse- and patient-derived breast cancer organoids durably stabilized a luminal-like state, reducing self-renewal, migration, tumor formation, and metastatic potential. CB1R inhibition had no effect; CB2R-deficient cells showed similarly reduced aggressiveness. Evidence is preclinical.

	Scientists uncover shared biology behind profound fatigue in five major illnesses A computational 3D-genomic analysis linked ME/CFS, long COVID, PTSD, rheumatoid arthritis, and multiple sclerosis to shared regulatory networks involving immune/inflammatory signaling, mitochondrial energy production, metabolism, stress responses, and neuroendocrine pathways. Direct gene overlap was limited; candidate hub genes, including LAG3 in ME/CFS, require validation.

	Interstellar travel V: Warp drives, wormholes, and halo drives Warp drives and traversable wormholes are permitted by some general-relativistic models but require unconfirmed negative energy or mass and face major stability, causality, and engineering constraints. Halo drives could use black-hole gravity to reach near-light speed but require extreme precision, shielding, and prior access to a suitable black hole. All remain theoretical.

	Aging blocks the retina's ability to regrow lost neurons, a first-of-its-kind study finds Aging markedly reduces transcription factor–driven glial-to-neuron reprogramming in the retina. Reduced cellular plasticity and age-associated inflammation, potentially worsened by barrier dysfunction, contribute to this limitation. Anti-inflammatory steroids partially restored regeneration in aged tissue.

	Supplement plus chemotherapy boosts pancreatic cancer survival In a phase I trial of 16 patients with advanced pancreatic cancer, clinical-grade L-glutamine plus gemcitabine/nab-paclitaxel was associated with survival up to 22 months and weight maintenance in half of participants. Laboratory data indicated increased chemotherapy sensitivity. Randomized trials are needed to establish efficacy.

	Eight-letter DNA alphabet is accurately transcribed by a natural enzyme E. coli RNA polymerase accurately recognizes and transcribes DNA containing two synthetic base pairs, expanding the genetic alphabet from four to eight letters. Structural data indicate that synthetic pairs use recognition signals similar to natural bases. The enzyme also accommodates a synthetic pair lacking hydrogen bonds.

	AI helps reveal the immersive sensory experiences of ancient Etruscan tombs 3D, acoustic and AI-based visual models indicate that two Etruscan tombs created contrasting sensory settings. Tomba del Gallo likely emphasized clear acoustics and visually focused ritual activity, whereas Tomba dei Demoni Azzurri amplified reverberation, low-frequency vibration and attention-grabbing imagery, potentially promoting disorientation.

	CRISPR gene-editing therapy safely and continuously lowers cholesterol and triglycerides, first-in-human trial shows In a 15-participant phase I trial, one-time CRISPR-Cas9 therapy targeting hepatic ANGPTL3 lowered LDL cholesterol by 52.5% and triglycerides by 47.8% at 12 months at the highest dose. No treatment-related serious adverse events occurred during one-year follow-up; longer-term safety monitoring is planned.

	Scientists discover how fructose may help drive obesity In mice, intestinal ketohexokinase-C enabled fructose metabolism that supported gut immune cells, lacteal growth, and dietary fat absorption. Deleting this enzyme altered the microbiome, shortened lacteals, reduced fat absorption, and improved weight gain and metabolic measures despite similar calorie intake.

	Cancer cells release antioxidants to prevent immune cells from destroying them Tumors release the antioxidant peroxiredoxin 1 (PRDX1), which removes reactive oxygen species required for T-cell activation and tumor killing. In mouse models, loss of tumor PRDX1 enhanced immune activity, limited growth, and improved immunotherapy response. Human tumor data also supported PRDX1 release, identifying this pathway as a potential therapeutic target.

	Giant impact could have formed an intact moon within five hours, simulations suggest Simulations incorporating temperature-dependent material strength indicate that the thermal states of proto-Earth and Theia strongly influence lunar formation. Cooler, stronger bodies can produce an intact Moon within about five hours, whereas hotter bodies form a debris disk. Earth–Moon compositional similarity remains unresolved.

	AI suggests new physics experiments that could outperform human-designed setups AI-based optimization can search vast combinations of laboratory components to propose physics experiments with greater precision or sensitivity than human-designed setups. Applications include quantum optics, electron microscopy, fusion, particle detection, and gravitational-wave sensing. Humans remain responsible for defining objectives, constraints, and interpreting results.

	Researchers uncover promising new target for treating high blood pressure In female mice, deletion of transglutaminase 2 (TG2) in myeloid immune cells attenuated angiotensin II–induced hypertension, arterial stiffening, and inflammation. TG2 may contribute to hypertension through inflammatory immune mechanisms and represents a potential therapeutic target.

	Five-metal 2D catalysts could convert CO₂ to CO without needing an extra electrical boost Computational screening identified three five-metal high-entropy MBenes predicted to reduce CO₂ to CO without additional applied potential. Their chemically diverse surfaces may distribute catalytic roles, with chromium favoring CO₂ adsorption and zirconium or hafnium promoting electron transfer. Experimental synthesis and electrochemical validation are needed.

	Traces of nearly 4 million coins reveal how Rome achieved economic integration Analysis of ~4 million Roman coins dated 155 BCE–2 CE showed nonrandom circulation concentrated along roads, ports, and urban trade routes. Military expansion initiated monetization, but sustained coin use depended on administrative, civic, and market integration. Distance effects declined as the Republic expanded, indicating increasing economic connectivity.