Roughly 5 ¹/₂ million Americans are living with Alzheimer’s, a disease that ravages sufferers’ memories and, ultimately, stops their bodies from performing basic functions. There’s no cure, and not much that patients and their caregivers can do to stop the progression — but according to Joseph Jebelli, a neuroscientist and author of “In Pursuit of Memory: The Fight Against Alzheimer’s” (Little, Brown; out Oct. 31), hope is on the way. He estimates that there will be a medication to prevent the disease within the next 10 to 20 years.

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