Nobody has to tell you that when things go bad, they go bad quickly and seemingly in bunches. Complicated structures like buildings or bridges are slow and laborious to build but, with a design flaw or enough explosive energy, take only seconds to collapse. This fate can befall a company, the stock market, or your house or town after a natural disaster, and the metaphor extends to economies, governments, and even whole societies. As we proceed blindly and incrementally in one