The popularity of Goldberg's cartoons was such that the term "Goldbergian" was in use in print by 1915, and "Rube Goldberg" by 1928. "Rube Goldberg" appeared in the "Random House Dictionary of the English Language" in 1966 meaning "having a fantastically complicated improvised appearance", or "deviously complex and impractical." The 1915 usage of "Goldbergian" was in reference to Goldberg's early comic strip "Foolish Questions" which he drew from 1909 to 1934, while later use of the terms "Goldbergian", "Rube Goldberg" and "Rube Goldberg machine" refer to the crazy inventions for which he is now best known from his strip "The Inventions of Professor Lucifer Gorgonzola Butts", drawn from 1914 to 1964.