Innovative technology has been our only avenue for prophesying. But though predictive technology is only as effective as current science and engineering developments allow, that hasn’t stopped humans from holding lofty visions for a high-tech future. In 1930, John Maynard Keynes predicted that productivity advancements would shrink his children’s future workweeks to 15 hours. And at the 1962 Seattle World’s Fair, visitors stepped into a futuristic world where cities were encased in climate-controlled domes and they could fly to work using “gyrocopters.”