Ernest Hemingway? Mark Twain? Luke McLuke? Lydia DeVilbiss? Oliver Wendell Holmes Sr.? Oliver Wendell Holmes Jr.? Frederick B. Wilcox? Abigail Van Buren? Anonymous? Dear Quote Investigator: While searching the twitter database I encountered the following two similar jokes: (1) Humans need two years to learn to speak and sixty years to learn to shut up. …