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must stimulate the brain more often and can stay away from AD 


Lifelong Brain-Stimulating Habits Linked to Lower Alzheimer's Protein Levels
source: http://www.sciencedaily.com/releases/2012/01/120123163348.htm



Lifelong Brain-Stimulating Habits Linked to Lower Alzheimer's Protein Levels
source: http://www.sciencedaily.com/releases/2012/01/120123163348.htm