What is the difference between mean and median, blatant and flagrant, flout and flaunt Is it whodunnit or whodunit Do you know Are you sure With Troublesome Words , journalist and bestselling travel-writer Bill Bryson gives us a clear, concise and entertaining guide to the problems of English usage and spelling that has been an indispensable companion to those who work with the written word for over twenty years. So if you want to discover whether you should care about split infinitives, are cursed with an uncontrollable outbreak of commas or were wondering if that newsreader was right to say 'an historic day', this superb book is the place to find out.