Frontiers of Life addresses fields of biology in terms of their frontiers--that is, the areas that will demand the most work in this new century. Because of their standing, the editors have been able to unite the most prestigious and well-informed authorities to place recent scientific advances into the context of their effects on daily human experiences and expectations. They ask, "What frontiers of the biological sciences will constitute the challenges of the next century?" Their first answer is an understanding of the processes and mechanisms that led to the origin of life. They take this answer as the starting point of the first section of the Encyclopedia. They thus proceed throughout the four volumes. Separating this Encyclopedia form others is its multidisciplinary approach to the "frontiers" theme. While other encyclopedias strive to describe the past and present states of many subjects, Frontiers of Life offers the insights of world-class scientists into their subjects' growth areas.