The brain's blood vessels may hold a key to Alzheimer's—and protection from it
Alzheimer's disease is one of the most feared diagnoses among older adults, particularly for those who know they carry a high-risk gene that magnifies their odds. But even many people with this gene—APOE ε4—dodge the disease and stay mentally sharp into their 80s.

<p>Alzheimer's disease is one of the most feared diagnoses among older adults, particularly for those who know they carry a high-risk gene that magnifies their odds. But even many people with this gene—APOE ε4—dodge the disease and stay mentally sharp into their 80s.</p>