Any system this complex and tightly coupled has two related weaknesses. First, it’s subject to seeing minor initial flaws cascade via an unpredictable sequence into something much larger and more damaging. Such a cascade, which sociologist Charles Perrow labeled a ‘system accident’ or ‘normal accident,’ characterized the 1979 meltdown of the Three Mile Island nuclear plant, the August 2003 electrical blackout that affected forty-five million people throughout the U.S. Northeast, and many other incidents.1 Second, complex, tightly coupled systems make tempting targets for spies, criminals, and
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