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In some cases, if a drug saves 10 out of 10,000 lives, for example, small effects can be profound, but in terms of personality traits and how you rate them, a 0.02 correlation doesn't get you anything of note. You are not going to be able to see it with the naked eye. You're not going to be able to sit two people down next to each other and see the differences between them. It's not noticeable by anybody.