Theories of distributive justice tend to focus on the issue of what constitutes a fair division of 'external' goods and opportunities; things like wealth and income, opportunities for education and basic liberties and rights. However, rapid advances in the biomedical sciences have ushered in a new era, one where the 'genetic lottery of life' can be directly influenced by humans in ways that would have been considered science fiction only a few decades ago. How should theories of justice be modified to take seriously the prospect of new biotechnologies, especially given the health challenges posed by global aging? Colin Farrelly addresses a host of topics, ranging from gene therapy and preimplantation genetic diagnosis, to an 'anti-aging' intervention and the creation and evolution of patriarchy. This book aims to foster the interdisciplinary dialogue needed to ensure we think rationally and cogently about science and science policy in the twenty-first century.