"The title of this essay is deliberately provocative. Eugenics can be thought of as any attempt to harness the power of reproduction to produce people with traits that enable them to thrive. Nearly everyone agrees that parents should provide an environment that promotes the welfare of their children. Advocates of eugenics add that we should also manipulate biology to promote well-being, provided we can do so without imposing undue risk on our children or on other people with whom they will share the planet."