NPR's Brooke Gladstone takes a look at wartime propaganda. She talks with authors Alan Winkler, Phillip Knightley, and Rick MacArthur about propaganda used to support various U.S. military campaigns. Gladstone concludes her report with a quote from French playwright Jean Anouilh: "Propaganda is a soft weapon. Hold it in your hands too long, and it will move around like a snake and strike the other way."