In the mid $1990$s$,$ Hush Puppies$$an old$-$fashioned kind of shoe$$became suddenly, unexpectedly popular. Fashion photographers in New York City were talking about how Hush Puppies were becoming $$hip$$ again; supposedly, young people were going to stores and buying Hush Puppies in bulk. By $1995,$ a handful of key fashion designers had included Hush Puppies in their work, and a handful of celebrities wore Hush Puppies to fashion and film premiers. Hush Puppies quadrupled their sales in less than a year; then, they quadrupled again in the next year. How did Hush Puppies become so popular, so quickly? Gladwell gives another example of sudden, unexpected changes: the New York neighborhood of Brownvsille. At late as the $90$s$,$ there were staggering numbers of