Rare mutation may help some people with high genetic risk resist Alzheimer's disease

ScienceDaily describes a rare mutation that may explain why some people with a high genetic risk of Alzheimer's remain mentally sharp into their 80s. It says the mutation protects the brain from harmful protein buildup and could lead to treatments that mimic that defense. Separately, Clarixnews says research suggests walking 3,000 steps a day may help slow Alzheimer's-related brain changes and reduce harmful tau buildup.