"Identity diversity" (race, gender, sexuality, etc.) makes no contribution to science argues John Staddon in this article. The evidence comes from history, anecdote, and from science itself. From Newton through Maxwell, Helmholtz, and Charles Darwin it was a homogeneity of culture, if not race, that led to the novel set of beliefs and practices that is now call science. Anecdotes and simple logic also show that a relatively homogeneous group focused on a widely recognized problem, especially a problem in a controversial area, is likely to interact more freely and creatively than a self-consciously "diverse" collection of people, constrained possibly by others' sensitivities. In this article, he examines studies that explore this topic.