If you listen to National Public Radio, watch TV, or surf the Web, chances are you have come across commercials enticing you to “improve your memory” and “unlock your inner genius” with “brain training developed by neuroscientists.”  In search of solid evidence for these claims, Alzforum came across a new research use for the data generated as millions of people are playing online while being tracked. Scientists are mining databases for clues that people might be sliding toward dementia, and become candidates for therapeutic prevention trials. Read Jessica Shugart’s two-part story.