The science-fiction novel "Stranger in a Strange Land," by Robert A. Heinlein, is published. It tells the story of Valentine Michael Smith, a human who was born and raised on Mars and then returns to Earth. The book would introduce the term "grok" into the English language.
(* From William H. Patterson Jr., editor of The Heinlein Journal: "It was offered in June 1961 by the Doubleday SF Book Club ... I regard the true issue as the trade hardback, which was issued on July 1, 1961.")
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* The Heinlein Society: @
* The Heinlein Journal: @
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* www.wegrokit.com: @
* "Grok" definition (dictionary.com): @