"(...)Eventually Stranger in a Strange Land became a cult classic , attracting many readers who would not ordinarily have read a work of science fiction. The late- 1960s counterculture , popularized by the hippie movement, was influenced by its themes of individual liberty, self-responsibility, sexual freedom and the influence of organized religion on human culture and government, and adopted the book as something of a manifesto . (...)Like many influential works of literature, Stranger made a contribution to the language: specifically, the word " grok ." In Heinlein's invented Martian language, " grok " literally means "to drink" and figuratively means "to understand," "to love," and "to be one with." This word rapidly became common parlance among science fiction fans, hippies, and computer hackers, and has since entered the Oxford English Dictionary among others."