Emily K. Abel is Professor Emerita and Research Professor at the UCLA Fielding School of Public Health and author of, among other works, Sick and Tired: A History of Fatigue and Tuberculosis and the Politics of Exclusion: A History of Public Health and Migration to Los Angeles. Margaret K. Nelson is Professor of Sociology Emerita at Middlebury College and author of, among other works, Like Family: Narratives of Fictive Kinship and The Social Economy of Single Motherhood: Raising Children in Rural America.