Section 1, Individuals, Symptoms, and Diagnoses, summarizes what is known about tics, comorbid disorders, neuropsychological and social function, differential diagnosis, and the Darwinian perspective. Chapters on "Tics and Tic Disorders" and "Obsessive-Compulsive Disorder, Anxiety, and Depression" survey the clinical phenomenology using extensive data as well as concise but lively clinical anecdotes. For example, forbidden urges are typified by the story of a high-energy physicist who had to give up his job because he felt the urge to disobey the "Danger: High Voltage" warning by touching the forbidden apparatus (p. 30). New concepts explaining known clinical phenomena add interest, even for readers with extensive experience with these disorders. For example, the temporal course of Tourette’s syndrome is described on the basis of the mathematical concept of a fractal, a term borrowed from the language of chaos theory. A fractal is a repeated pattern that can be observed across different scales of time or space. For tics, it has long been known that individual tics come in bursts of multiple tics. What is new is the perspective that these bursts also come in clusters of bursts and that the clusters of bursts occur within clusters themselves. This fractal pattern is better communicated graphically as a distribution of events over time than by text, and a series of scatter plots does that well graphically (p. 38). The first section of the book also includes chapters on comorbid ADHD and learning disabilities, neuropsychological aspects, peer acceptance, differential diagnosis, and Tourette’s syndrome from the Darwinian perspective on adaptation.