Are you so sure about "assure," "ensure," and "insure"? Can you determine whether a knob of butter is equivalent to a lump or a pat or a scosh? Can you say which word in the English language has the most definitions, or who put the H in Jesus H. Christ? If you can't, be assured that Charles Harrington Elster, author of several well-loved works on language, can--and does in his latest book, a delightfully designed compendium of the most common,...