Book excerpt: Chance, Development, and Aging analyzes a subject that has been largelyignored until now: the sources of individual variations in development and agingthat cannot be attributed to genes or the external environment. And by doing so,this book develops new insight on aging and the individual. Gathering andscrutinizing evidence from diverse sources, the authors examine thosedifferences in individuals that arise during development and those that mightinfluence outcomes of aging. Through their research, they pose a new set ofquestions about the contribution of chance events during development, andalthough chance variations during development are well known within thesub-fields of developmental biology, there has been little recognition of theiraffects on variations in adult form and function. Here, the authors confrontthis issue with a fascinating hypothesis: chance variations in form andfunction, arising through development, affect individual base-line functions andindividual responses to the external environment and so modify outcomes ofaging. This book will undoubtedly benefit gerontologists, geneticists,reproductive biologists, and physiologists, and it will fascinate all thoseinterested in the outcomes of aging.