How the Other Half Lives: Studies among the Tenements of New York (1890) is an early publication of photojournalism by Jacob Riis, documenting squalid living conditions in New York City slums in the 1880s. The photographs served as a basis for future "muckraking" journalism by exposing the slums to New York City's upper and middle classes. They inspired many reforms of working-class housing, both immediately after publication as well as making a lasting impact in today's society. Source: Wikipedia (en)