Fiftieth anniversaries are special.
D000047:Academies and Institutes / Q000266:history; D002648:Child; D002669:Child Welfare / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D010372:Pediatrics / Q000266:history; D012943:Social Security / Q000266:history; D014481:United States