Sometimes we adopt certain beliefs when we're children and use them automatically when we become adults, without ever checking them out against reality. This brings to mind the story of the woman who always cut off the end of the turkey when she put it in the oven. Her daughter asked her why, and her mother responded, "I don't know. My mother always did it." Then she went and asked her mother, who said, "I don't know. My mother always did it." The she went and asked her grandmother, who said, "The oven wasn't big enough."