The book focuses on what a cycle is and the reasoning that lead to the current scientific understanding of biological rhythms. A brief historical perspective on the study of biological rhythm and a review of the ways to collect, graph, and interpret data are provided. Many of the cycles in nature such as heart rate, body temperature, plant growth, animals' sleep cycles, and dream cycles are mapped out and explained. Several hands-on activities are provided in the last chapter of the book to demonstrate cycles in chemicals, animals, and plants. Procedure, measurements, how to graph results, and further study projects are given for each activity.
Bibliography is included at the end of the book.
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