Photo by Dead Cat , via Flickr I have lived many lives in addition to my own. I have heard the best stories, been influenced by the best wisdom, learned life-giving lessons, laughed at the best jokes, had the most fascinating experiences. This is because I have been a ghost for nearly twenty years, and have ghostwritten, rewritten, or developmentally edited over seventy books. (This doesn’t count the books I’ve written for me.) I tell my clients their life stories and the lessons they’ve learned are vitally important, that what they feel, think, say, and do matters. To them, their families, their communities, to history itself. I am now taking my own advice by writing a new book, tentatively titled My Life As a Ghost, which shares what I’ve learned from all these lives that are not my own. I can’t share the actual stories because they don’t belong to me, but what I’ve learned does. A ghost has to learn to think like someone else, even others radically different than her. Like...