The study of catastrophe is a growth industry. Today, cosmologists scan the heavens for asteroids of the kind that smashed into earth some ninety million years ago, leading to the swift extinction of the dinosaurs. Climatologists create elaborate models of the chaotic weather and vast flooding that will result from the continued buildup of greenhouse gases in the planet's atmosphere. Terrorist experts and homeland security consultants struggle to prepare for a wide range of possible biological, chemical, and radiological attacks: aerated small pox virus spread by a crop duster, botulism...