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Dorothy and Levi Reeves stand in their Oakland, Calif., home, holding their wedding photo from 57 years ago. Dorothy Reeves agreed to donate both of their brains after death to the University of California-Davis for research. (Anna Gorman/KHN)

Dorothy and Levi Reeves stand in their Oakland, Calif., home, holding their wedding photo from 57 years ago. Dorothy Reeves agreed to donate both of their brains after death to the University of California-Davis for research. (Anna Gorman/KHN)