Movies predict tech´s future [Dataflow]

Many futuristic movies are vague about the year in which their action takes place. But other movies are willing to nail their colors to the mast, predicting specific technologies in specific years. Some of these visions-like the soaring skylines of Metropolis??have already come to pass, while others- like the hoverboards of Back to the Future II-seem likely to miss the mark. But some of the underlying themes have a timeless appeal.