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Tales from the Cube: Don’t Underestimate Stealth Variable
has a troubleshooting story-telling feature called Tales from the
Cube similar to the Sherlock Ohms feature by Design News.
This one, titled "Don't Underestimate Stealth Variable." This
one really reaches back into another era when terms like "cordwood"
meant something other than fireplace fodder to electronics techs and
engineers. The lesson, though, is still applicable today.