Physical and mental activities are both important for protecting your thinking skills and warding off dementia. But does one trump the other?

In many ways, our memories shape who we are. They make up our internal biographies — the stories we tell ourselves about what we've done with our lives. They tell us who we're connected to, who we've touched during our lives, and who has touched us. In short, our memories are crucial to the essence of who we are as human beings.