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Half-length portrait of author Isaac Asimov, wearing a white shirt, sitting over a table, flipping through pages of a book, wearing glasses and a patterned tie, with a serious facial expression, 1970. (Photo by JHU Sheridan Libraries/Gado/Getty Images).

Half-length portrait of author Isaac Asimov, wearing a white shirt, sitting over a table, flipping through pages of a book, wearing glasses and a patterned tie, with a serious facial expression, 1970. (Photo by JHU Sheridan Libraries/Gado/Getty Images).