This intriguing book explores love in all its forms and from many perspectives. The biological underpinnings of feelings are explored, including the interaction of brain, nervous system, hormones, and body chemistry. Love is considered as an evolutionary phenomenon with origins in animal behavior. According to Shakespeare, ""The course of true love never did run smooth,"" and ""The Brain and Love"" indeed looks at love as a give-and-take process involving costs and benefits. The author describes attempts to classify, categorize, and measure the various components of love (as distinguished from passion).