All sorts of accidents are expected. We take them into account. For example, if you operate a large data center, you simply assume that a certain number of driv

All sorts of accidents are expected. We take them into account. For example, if you operate a large data center, you simply assume that a certain number of drives and motherboards will fail, and build it into the plan. No one planned for Fukushima to be flooded. No on planned for one of Chernobyl's reactor cores to explode. (The phrase "impossible" was tossed around a lot; it took a good deal of thinking to finally recognize the design flaw.)