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Unless you were part of the team designing and building them I'm not sure you know how an ipad works. Pop Quiz: How does an ipad work?

Not sure any single person who worked on it knows how it works either.

Not a single person understands all of unix either but many can tell you how it works.

It's unfair to change the verb from use to build.

I didn't say how to build I asked how does it work. If someone knows how to use something they can explain how it works at least in their mind.

> If someone knows how to use something they can explain how it works at least in their mind

Can you explain how this squares with your other comment about how I couldn't possibly know how it works if I wasn't on the team who built it?