The specter of neighborhood appropriation by big capital and other outside actors, pricing out the people who lived there previously, is the traditional conception of “gentrification.” But the feelings evoked by this urban phenomenon are so intense that the term has expanded to mean many other things – perhaps too many to keep its potency and specificity. Unfrozen interviews Japonica Brown-Saracino, a professor at Boston University and author of "The Death and Life of Gentrification: A New Map of a Persistent Idea."