Brain Activity May Predict Alzheimer’s Years Before Memory Loss

Scientists at Stanford Medicine have identified patterns of brain activity that may predict Alzheimer’s disease years before cognitive symptoms appear. Researchers compared resting-state functional MRI scans from 180 exceptionally resilient older adults, known as super agers, with scans from 110 Alzheimer’s patients. They developed an Alzheimer’s resilience-vulnerability connectome score that distinguished the groups with approximately 85% accuracy. When applied to more than 1,300 cognitively healthy adults aged 55–70, the score predicted subsequent cognitive decline and Alzheimer’s-related changes over follow-up periods extending up to 12 years. Published November 4 in Science Advances, the findings suggest brain connectivity could provide an earlier warning signal than conventional biomarkers. However, the score is not yet a diagnostic test, and researchers have not demonstrated that changing these activity patterns prevents dementia. (Stanford Medicine)

Gas Above Martian Volcano Suggests Mars May Still Be Volcanically Active

Mars may not be as geologically dormant as scientists once believed. Researchers analyzing observations from the ExoMars Trace Gas Orbiter detected hydrogen chloride above surface fissures near Alba Mons, the planet’s largest volcano by surface area. The gas, commonly associated with volcanic emissions on Earth, appeared in seasonal concentrations that increased during early Martian summers. Scientists propose that rising temperatures melt ice sealing underground fissures, allowing trapped gases to escape from possible magmatic activity beneath the surface. Published November 4 in Science Advances, the findings provide atmospheric evidence consistent with ongoing volcanic processes. If subsurface magma remains active, it could heat underground water and create environments potentially suitable for microbial life. However, the gas detection does not conclusively establish active volcanism or the existence of living organisms. (Reuters)

Scientists Stimulate the Brain’s Waste-Removal System While People Are Awake

Researchers in Finland have demonstrated a technique that appears to increase the removal of brain-derived proteins while people are awake, potentially opening a new avenue for studying neurodegenerative diseases. Scientists at the University of Oulu and Oulu University Hospital tested 29 healthy adults using a combination of temporarily lowered blood pressure and rhythmic whole-body vibration. MRI measurements and blood biomarkers revealed changes in cerebrospinal fluid circulation and increased concentrations of proteins associated with brain clearance, including beta-amyloid. The treatment strengthened slow vascular pulsations resembling processes that naturally occur during sleep. Published in Nature Communications and reported November 4, the study suggests that mechanical and vascular stimulation may enhance the brain’s waste-removal mechanisms. However, the researchers have not established that the technique prevents Alzheimer’s disease or improves cognition. (Medical Xpress)

Antarctic Ozone Hole Grows Despite Long-Term Recovery

The Antarctic ozone hole became unusually large in 2026, even as Earth’s protective ozone layer continued its long-term recovery, according to NASA and NOAA. During the peak depletion period from September 7 through October 13, the hole averaged approximately 9.6 million square miles, ranking seventh largest in 48 years of monitoring. Its maximum one-day extent reached 10.5 million square miles on September 18. Scientists attribute the exceptional size partly to an unusually strong polar vortex that maintained cold conditions favorable for ozone destruction. However, ozone concentrations did not fall as severely as during some earlier large-hole years. Reported November 4, the findings demonstrate how annual atmospheric variability can temporarily obscure long-term environmental improvements. Researchers estimate that Antarctic ozone could recover by the 2070s under existing international restrictions on ozone-depleting chemicals. (NASA Science)

Silk Microneedles Could Transform Vaccination of Farmed Fish

MIT engineers have developed biodegradable microneedles that could make vaccinating farmed fish safer, less stressful and more efficient. Conventional fish vaccination frequently requires workers to sedate animals, remove them from water and inject them individually, creating substantial labor costs and potential injuries. The new system uses food-grade silk coated with shellac, a natural resin that prevents the microneedles from dissolving prematurely underwater. Researchers demonstrated that the devices could penetrate wet fish skin, remain attached during swimming and deliver bacterial or DNA vaccine materials over controlled periods. Tests in rainbow trout showed that fish weighing just one to two grams could receive the microneedles, potentially protecting juveniles too small for conventional injections. Published in ACS Nano and reported November 2, the technology remains experimental and requires further development before commercial aquaculture deployment. (Massachusetts Institute of Technology)