In June 1914: A young man in Sarajevo steps up to a carriage and fires his pistol. The Archduke Ferdinand dies. Within weeks, the first world war began. In the 1940s: The French resistance kill occupying troops when and how they can. In June 1944: at Oradour-sur-Glane, in Central France, German SS troops take revenge, massacring 642 villagers. In August 1945: the United States Air Force drops the world's first nuclear weapon. Some 190,000 Japanese die, nearly all of them civilians. Within days the second world war has ended. Which of these four events was an act of terrorism? Which achieved anything? Whic