Plasma physics may hold the key to a virtually inexhaustible future energy source through the control of thermonuclear reactions. The complexity of plasma physics makes it a difficult subject to write about in popular terms, but the authors of The Fourth State of Matter: An Introduction to Plasma Science, Second Edition treat plasma in a comprehensible way. Combining factual substance with an easy-to-read and lucid presentation, the book describes the characteristics of plasma, its distribution in the universe, and how it is used by man. It explores plasma in industry and presents current and possible future applications. The book also details the history of plasma research and plasma technology. Retained from the first edition, rhyming verses add fun to the explanation of what can be complicated scientific concepts. Accessible to anyone interested in plasma physics, this non-mathematical book is an excellent addition to a well-rounded science collection.</P>