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he can put the gas in, turn it off, and can change a tyre, he needs to know nothing else.

The average computer use need only know how to turn it on, open an app, close an app, enter basic data in a form or document, save to a file, save to a disc, turn it off. They do NOT need to know anything else to do their daily work.

In both cases, neither bothers to learn what goes on under the hood.