New Yorker writer Malcolm Gladwell looks at why major changes in our society so often happen suddenly and unexpectedly. Ideas, behavior, messages, and products, he argues, often spread like outbreaks of infectious disease. Just as a single sick person can start an epidemic of the flu, so too can a few fare-beaters and graffiti artists fuel a subway crime wave, or a satisfied customer fill the empty tables of a new restaurant. These are social epidemics,...

Throughout World War II, when Saturday nights came around, servicemen and hostesses happily forgot the war for a little while as they danced together in USO clubs, which served as havens of stability in a time of social, moral, and geographic upheaval. Meghan Winchell demonstrates that in addition to boosting soldier morale, the USO acted as an architect of the gender roles and sexual codes that shaped the "greatest generation." Combining archival...