New from AP Editions: The Boston Marathon Bombing. Be sure to check out the full line of breaking news books by the AP. http: //www.ap.org/books/ The Boston Marathon isn't just an athletic event - it's a citywide celebration and a rite of spring. Begun in 1897, it is the world's oldest annual marathon, run every Patriots' Day. The course winds its way through eight cities and towns, 26.2 miles that lead from suburban Hopkinton to the Boston's Back...