Upon discovering that we work with computers, most people think we can fix anything computer related and worse, that we have access to some sort of ancient repository of knowledge (previously memorized of course) to deal with any problem that arises, or that we learned it through years of grueling schoolwork and study.  It’s not true, as reported by XKCD.  (this one’s for Randy, who actually answers all of your, and my questions.  And Erik’s.  And Rick’s).