This 1936 promotional film by Chevrolet explains the concept of streamlining objects to reduce their drag. And it actually does a pretty nice job of it, including some wind tunnel footage and table-top demonstrations. It’s also an amazing snapshot of the era, both in terms of engineering and the vision they had for the future. Just check out that City of the Future and its torpedo cars! (Video and image credit: Chevrolet; submitted by Larry S.)