"On two occasions, I have been asked [by members of Parliament], 'Pray, Mr. Babbage, if you put into the machine wrong figures, will the right answers come out?' I am not able to rightly apprehend the kind of confusion of ideas that could provoke such a question." - Charles Babbage

Mr Attwood has a point, in that average Joe certainly doesn't need to program in order to understand their domain better. But I would ask rather then, how can one educate people on how machines work other than writing code ( I seem to remember what little was done in my education about computing, taught me little about the practicality of why in a machine )