This book describes and theorizes the function of graphs and graphing in scientific discovery work from a social practice perspective. In this work, graphs are both topic and tool. In discovery work, where scientists do not initially know what to make of graphs, there is a lot of uncertainty and scientists struggle in trying to make sense of what to make of graphs. Contrary to the belief that scientists unproblematically ?interpret? graphs, the chapters in this book show that uncertainty about their research object is tied to uncertainty of the graphs. It may, as in this study, take several years of struggle in their workplace before scientists come to know just what their graphs are evidence of. Scientists may resist what eventually comes to be known as the correct interpretations ? leading, as in the present case, to a discovery that overthrows what has been a 60-year scientific canon. Graphs turn out to stand to the entire research in a part/whole relation, where scientists not only need to be highly familiar with the context from which their data are extracted but also with the entire process by means of which the natural world comes to be transformed and represented in the graph. This has considerable implications for science, technology, engineering, and mathematics education at the secondary and tertiary level and in vocational training. ?