If you could talk to some folks who attended the 1964 World’s Fair, they might be a little disgruntled. After all, they were promised jetpacks, flying cars, and vacations to Mars in the near future. Alas, we have none of those things, and yet we still expect transformative technologies like self-driving cars to be part of our lives soon. This week, we talk with robotics pioneer Rodney Brooks about the art of predicting when new technology will go mainstream.