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http://en.wikipedia.org/wiki/Bathtub_curve
Yes, electronics have a little bit of black magic.
You can actually see the magic smoke emitted from some type of circuit when it goes bad.
http://en.wikipedia.org/wiki/Magic_smoke
When these system are built they will use decision tree with multiple computers. In a 3 computer system as long as 2 of them are functioning we shouldn't have to worry. Military fighter jets already use a similar decision tree.