There are distinct forces that permeate media. But as many in radio—myself included—have learned over the years, nostalgia may be one of the most powerful. And now, given the uncertain times in which we live, those who study lifestyle trends point to a nostalgia comeback, as counter-intuitive as that may sound. Nostalgia is like cultural "comfort food" and I've gathered up a few of the more powerful signs of nostalgia's ramp-up as we head into the holiday season. See what you think, and w...