Norman Cohen; The Wistar Institute, Wistar Archive Collections, Philadelphia, PA; University of Pennsylvania, University Archives and Records Center; University of Pennsylvania, University Archives and Records Center; Leonard Hayflick; Katherine Aird; Eva Herrström; Margareta Böttiger; Ernholm Family; Smithsonian Institution, Division of Medicine & Science, National Museum of American History; U.S. National Library of Medicine, History of Medicine Division; American Media, Inc.; James A. Poupard; Frank P. Montone/Special Collections Research Center, Temple University Libraries, Philadelphia, PA: University of Pennsylvania, University Archives and Records Center; Edward A. Hubbard/U.S. National Library of Medicine; Smithsonian Institution, Division of Medicine & Science, National Museum of American History; Royal Prince Alfred Hospital Museum and Archives; Frederick A. Murphy, University of Texas Medical Branch, Galveston, Texas; The Wistar Institute, Wistar Archive Collections, Philadelphia, PA; Mary and Steve Wenzler; Philadelphia Archdiocesan Historical Research Center, Robert and Theresa Halvey Photograph Collection; Merck Archives—Merck, Sharp & Dohme Corp., 2016; March of Dimes Foundation; Dorothy M. Horstmann papers (MS 1700). Manuscripts and Archives, Yale University Library; Children’s Hospital of Philadelphia; Merck Archives—Merck, Sharp & Dohme Corp., 2016; Leonard Hayflick; National Institutes of Health; Jerry Huffman; poster reprinted with the permission of the Helen Keller National Center for Deaf-Blind Youths and Adults; Frederick A. Murphy, University of Texas Medical Branch, Galveston, Texas; The Wistar Institute, Wistar Archive Collections, Philadelphia, PA; Meredith Wadman