Memory makes us who we are. And because it is our identity, we worry about it, fretting if we can't remember the name of someone we just met--or know well--getting upset when we can't recall where we put our keys or left the car in the parking lot or whether we mailed the phone bill. We walk into a room and halt in midstride, the purpose forgotten. These annoying things happen to most of us eventually, and for a simple reason. Just as the body changes over time, so does the brain. "On any intelligence or memory test," says University of...
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