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I believe they all have some educational value, but this, as Donald
points out depends on the investment of answering a number of critical
questions. I brought up this topic because I started second guessing
the worth of these fun demos after hearing someone say they aren't
demonstrating what they were intending to. In the desire of fostering a
better understanding, I would be willing to drop certain tricks of the
trade and look for others to replace them. But, I need to be convinced
they are not serving their purpose. Like the Lenz's Law demo, I have so
much fun with this one that I'd hate to give it up if it is really much
more complicated than I am making it out to be.