For millennia, predicting the future was the province of priests, prophets, astrologers, and seers. Then, in the 20th century, futurologists emerged, arguing that data and design could make such forecasting a certainty. Historian Glenn Adamson offers insight into how the world was transformed by such forecasts of the future—whether in the imagining of new cities, the projection of novel technologies, or the pervasive anticipation of economic and political risks.