What is the nature of science? The answer to that question can be found in the momentous theories and discoveries that have occupied scientists for generations. The Importance of Scientific Theory series helps students develop a broader and deeper understanding of the nature of science by examining richly detailed examples from history. Titles in this series examine how scientists arrived at core ideas such as atomic theory, germ theory, evolution theory, and more as well as what resulted from widespread acceptance of these theories. Each volume includes a visual chronology; sidebars that highlight and further explain key events and concepts; and, wherever possible, the words of the scientists themselves. Book jacket.