"Can species change? Or go extinct? In the eighteenth century, most people answer no to both questions. But in the century that follows, that certainty gets challenged as some people in Europe question the common belief that all creatures are the same as they've been since life's creation. The Evolution of an Idea, the second volume of Discovering Life's Story, opens with the Swedish naturalist Carl Linnaeus, who attempts to create an organizing system for the myriad forms of life on earth. It c