The book is devoted to the intriguing post-war activity called—with different terms—futurism, futurology, future research, or futures studies. It seeks to understand how futurists and futurologists imagined the Cold War and post-Cold War world and how they used the tools and methods of future research to influence and change that world. Forms of future research emerged after 1945 and engaged with the future both as an object of science and as an object of the human imagination. The book carefully explains these different engagements with the future, and inscribes them in the intellectual history of the post-war period. Futurists were a motley crew of Cold War warriors, nuclear scientists, journalists, and peace activists. Futurism also drew on an eclectic range of repertoires, some of which were deduced from positivist social science, mathematics, and nuclear physics, and some of which came from new strands of critical theory in the margins of the social sciences or sprung from alternative forms of knowledge in science fiction, journalism, or religion. Different forms of prediction lay very different claims to how, and with what accuracy, futures could be known, and what kind of control could be exerted over coming and not yet existing developments. Not surprisingly, such different claims to predictability coincided with radically different notions of human agency, of morality and responsibility, indeed of politics.