🧠 Brain Plasticity Has No Age Ceiling — A 4,000-person, three-year UT Dallas study confirms cognitive performance can improve well into the 90s, making brain health a genuinely actionable target at every life stage. 🧠 Blood Cancer Mutations May Be a Missing Alzheimer's Mechanism — TET2, DNMT3A, and ASXL1 mutations in brain microglia create a destructive inflammatory environment in Alzheimer's tissue, opening a new door to both screening and repurposed cancer therapies. 🤖 A Vaccine Designed to End the Fentanyl Crisis — Scripps Research's cross-reactive fentanyl antibody platform blocks the drug before it reaches the brain and extends protection to designer analogs, with human trials already underway in 2026. 💪 GLP-1 Drugs Are Reducing Physical Activity, Not Increasing It — Fitbit data from ENDO 2026 shows step counts falling after GLP-1 initiation, making exercise counseling a critical and often missing element of metabolic treatment plans. 🥗 GLP-1 Drugs May Also Be Breast Cancer Prevention Tools — A 110,000-woman Penn Medicine cohort study found 30% lower breast cancer incidence in GLP-1 users, with a multisite prevention trial now being planned.