Evolution has meant that our prefrontal lobes are too small, our adrenal glands are too big, and our reproductive organs apparently designed by committee; a recipe which, alone or in combination, is very certain to lead to some unhappiness and disorder.

Summary

This quote suggests that human evolution has resulted in an imbalance in our brain and body structures, which can lead to unhappiness and disorder. The prefrontal lobes, responsible for decision-making and impulse control, may be too small in comparison to other parts of our brain. Our adrenal glands, which regulate stress responses, may be overly developed. And our reproductive organs are depicted as "designed by committee," implying that they may not function optimally. These evolutionary disparities are suggested to contribute to various forms of unhappiness and disorders in human beings.

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