How and why has the aerial bombing of civilian populations become standard military procedure?  Jay Thiemeyer reviews a new book  of essays on the history and problems raised by wars waged, not just against opposing armies, against peoples.   The book is Bombing Civilians: A Twentieth Century History, edited by Yuki Tanaka and Marilyn Young.   For a slideshow history of aerial bombing, go here.  You can also hear Marilyn Young following up on this review in a conversation with the Old Mole's Laurie Mercier -- click here.