What makes you pull a book from the shelves of Waterstones? All you have to go on are the title, author and publisher yet, after a quick perusal, you will be able to pick a book that, even if you do not buy it, will probably interest you. You can see why authors will agonise over what to pick for the title, almost as much as you do for the Subject Line of a marketing email. A bookshop browser, probably…