This book explores what constitutes an enhancement fit for humanity in the age of nanotechnologies, biotechnologies, information technologies, and technologies related to the cognitive sciences. It considers the influence of emergent technology upon our understanding of human nature and the impact on future generations. Drawing on the Catholic tradition in particular, the book gathers international contributions from scientific, philosophical, legal, and religious perspectives. Together they offer a positive step in an ongoing dialogue regarding the promises and perils of emergent technology for man's integral human development.