This episode of Economics in Plain English tackles the pervasive fear that technology is making humans (or at least human work) obsolete. How long before the robots take over the jobs we do today -- and is it time to panic? Not just yet, senior business editor Derek Thompson explains in the video above. Decades of film footage from the Prelinger Archive illustrate the steady march of progress in America, from farms to factories and beyond, all thanks to technological innovation. Machines have been doing more and more of our work for us since the industrial revolution, and that's not a bad thing.