Sometime they don't let you know that they know that they don't know everything but the core of the medical approach is that you try to identify pathologies which are subsystems within the human body or the larger system that are having undesirable consequences.

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It's one of the worst-kept secrets of family life that all parents have a preferred son or daughter and the rules for acknowledging it are the same everywhere: The favored kids recognize their status and keep quiet about it - the better to preserve the good thing they've got going and to keep their siblings off their back.