Thomas S. Kuhn&;s The Structure of Scientific Revolutions was a watershed event when it was published in 1962, upending the previous understanding of science as a slow, logical accumulation of facts and introducing, with the concept of the &;paradigm shift,&; social and psychological considerations into the heart of the scientific process. More than fifty years after its publication, Kuhn&;s work continues to influence thinkers in a wide range of fields, including scientists, historians, and sociologists. It is clear that The Structure of Scientific Revolutions itself marks no less of a paradigm shift than those it describes.             In Kuhn&;s &;Structure of Scientific Revolutions&; at Fifty, leading social scientists and philosophers explore the origins of Kuhn&;s masterwork and its legacy fifty years on. These essays exhume important historical context for Kuhn&;s work, critically analyzing its foundations in twentieth-century science, politics, and Kuhn&;s own intellectual biography: his experiences as a physics graduate student, his close relationship with psychologists before and after the publication of Structure, and the Cold War framework of terms such as &;world view&; and &;paradigm.&;