Is Jane Eyre happy? Is Hamlet sad? You will never find that out with a Google search tool

Well, whad’ya know – fewer writers used the word “theretofore” in the 1960s than used it in the 19th century; more employed the word “groovy”; the Second World War generated sadder words than the peace that followed it; American writers are more garrulous than we are, and no female character in any novel written by the Brontë sisters says “Whad’ya know”.