Urban slum dwellersespecially in emerging-economy countriesare often poor, live in squalor, and suffer unnecessarily from disease, disability, premature death, and reduced life expectancy. Yet living in a city can and should be healthy.Slum Healthexposes how and why slums can be unhealthy; reveals that not all slums are equal in terms of the hazards and health issues faced by residents; and suggests how slum dwellers, scientists, and social movements can come together to make slum life safer, more just, and healthier. Editors Jason Corburn and Lee Riley argue that valuing both new biologic and \';street\' scienceprofessional and lay knowledgeis crucial for improving the well-being of the millions of urban poor living in slums.