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The general question as to what can be simplified and what cannot is a
monumental question. It's one of the reasons why teaching is hard.
To illustrate how general the problem is, here are a couple of extreme
examples:
1) .....You can't have it both ways. Either hydrogens are big or they
aren't. If
they're not big, don't tell me fairy stories about it. Deal me straight or
deal me out. This is an example of completely boneheaded bad pedagogy,
because the right answer is not at all more complicated than the fairy story.
2) Pilot training (including textbooks as well as oral tradition) is full
of fairy stories about how airplanes respond in various
circumstances. Some of these fairy stories put lives at risk, by leading
people to use the controls inappropriately in emergencies.