>I have heard that water needs a rough surface in
>order to boil.  So the water in a glass may be
>above the boiling temperature and not boil until
>something rough is added.  At that point it tries
>to all boil at once.

Yes that is so, and there have been discussions on here in the past about
this, and the dangers of opening the microwave with the water in a
suprheated state because it hasn't done the bubbling bit.

Oh well, it will just have to be a mug of water with some coffee in it after
all. Gee, the things we have to go through to test components. Now where is
that suger bowl :))

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