A groundbreaking theory of personality.
In short, the evolutionary logic that makes us different from one another will gradually make us different from ourselves, context by context. Personality behavior that is "consistent across time and place," as one textbook puts it will fade. We'll miss characters like Harris, the little woman from New Jersey who boasted of giving psychologists a "wedgie" and tried to solve the puzzle of human nature. There won't be another one like her.