Genetics is transforming the way in which people look at the world and at themselves. Never before have humans had the ability to intervene in the processes of life at such a basic level. The benefits, such as feeding the hungry and fighting disease, are obvious. The dangers—increased social inequality and maybe even the creation of a new species that will be stronger, smarter, healthier, and longer-lived than human beings—are equally apparent. The Age of Genetics is full of both promise and peril.