Dr. Tyrone Hayes has loved frogs since childhood. Dr. Hayes’s studies of the effects of atrazine, a common agricultural pesticide, on amphibians are presented in clear detail, with text, photos, and diagrams efficiently modeling the scientific method. Although the producer of atrazine initially employed Dr. Hayes to study the pesticide’s effects, the company refused to let him publish his results. He repeated his experiments independently, with similar results, and has publicized the data in academic and public arenas. Pamela Turner deftly mixes scientific information with personal stories featuring Dr. Hayes (who has loved frogs since childhood), his family, and some of the students at the University of Califnornia at Berkeley mentored by this African American professor in a book that can engage readers from a broad range of perspectives—academic, scientific, political, cultural, and social. Andy Comins’s excellent photographs are well captioned and liberally sprinkled throughout this appealingly designed volume. (Ages 10–15)