Exuberance has ten chapters and almost 100 pages of notes. Each chapter is a series of examples of exuberance loosely gathered around a theme. Some of these examples are delightful: the reader is left with the vivid image of Teddy Roosevelt knee deep in violets, and the story about playing catch with an elephant is hilarious. However, the themes are superficial, and no clear argument is offered. The author's thesis goes like this: Some people are exuberant. Children and animals are exuberant in play. Playful creatures are better adapted. Some scientists are exuberant. Some famous people who were exuberant were also successful. People who are exuberant also can suffer other extremes of emotion, but exuberance can be recaptured even in the face of misery. Each theme is given copiously detailed examples, sometimes to the point of tedium, but summaries are in short supply. The whole rhetorical aspect of the book can be easily summarized by minimal alteration to the Cole Porter song Birds Do It.