Giving a case study for the power of photography to bring about direct social change, photographer Ken Light speaks about two important photographers — Jacob Riis and Lewis Hine. Jacob Riis' "How the Other Have Lives" is a seminal work of documentary photography that jumpstarted a wave of urban renewal and poverty reforms in the late 19th and early 20th centuries in America. His crusade for the dignity of the people living in slums laid the groundwork for many photographers to follow. Picking up Riis' torch was Lewis Hine, whose innovative outreach with photography helped bring about the end of grueling and exploitative child labor.