I make thousands of mistakes a day, mistakes typing, mistakes coding software, mistakes driving, mistakes walking, forgetting to order my sandwich without mayo, etc.  Most of the time they are immediately obvious — a red squiggly line under a word I mistyped, a compiler spewing an error message on line #42, a stubbed toe, my gps suggesting a u-turn at the next intersection, etc.


But what happens when the mistake isn’t obvious, isn’t noticed immediately, and doesn’t cause everything around me to immediately fail?  Often these mistakes can have a long lifespan.  Often we discover them when we are looking …
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