Nesse, a physician, and Williams, a leading evolutionary biologist, offer both medical researchers and general readers a wide-ranging survey of "Darwinian medicine." Suggesting evolutionary explanations for a wide range of phenomena including Sudden Infant Death Syndrome, cancer, and mental disorders, they offer researchers guidance in developing and testing hypotheses. General readers can expect to gain an evolutionary understanding of their bodies' functioning, and occasional misfunctioning." Enjoyable reading, praised by Edward O. Wilson for providing "not only means for the improvement of medicine but fundamental new insights into the human condition."