👉 Questman is a fictional character created by the American author and science fiction writer, Robert A. Heinlein. He was first introduced in his seminal novel "The Thing on the Wall" (1953), where he appears as a character who seeks to understand the mysteries of the universe. In this story, Questman is a 24-year-old man who has been living alone for years due to a mysterious illness that makes him unable to form relationships. He spends his days wandering through