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For eons, love was the province of poets and dreamers. Scientists considered it unworthy of real study. Yet, in the middle of the last century, one scientist had the courage and the curiosity to uncover the true power of love, and he forever changed the way we think about human relationships. This is the story of that great transformation. This is how the story of Harry Harlow’s life and career is introduced on the book jacket of Deborah Blum’s biography Love at Goon Park:: Harry Harlow and the Science of Affection. Harlow was an extraordinary man who affected the lives and work of many people around him. But I must be one of those dreamers who think that love falls outside the province of science or one of those cynics who is skeptical of any great transformations. Love sells, and the problem with books is that they need to be sold. Science also needs to be sold, and Harlow understood that very well. But neither Harlow’s science nor the story of his life and work is really about love, and both could be sold just as well without ever mentioning the L word. In his early career, Harlow made seminal contributions to the study of primate learning, and his later experiments with infant monkeys and their surrogate mothers hav