The problem with the Swiss cheese model, which is otherwise remarkably robust (we have it to thank for the past thirty years in which flying has been consistently safer than driving; even frequent fliers are more likely to be killed in a lawn mower accident than an airplane crash), is that the grid, like any complex mechanical system, is not just a machine but also the regulatory, business, cultural, and natural environments within which this machine functions. The grid is the physics, mechanics, engineering, construction, management, upkeep, and use internal to itself. It is also the storms,
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