I hold with Alexandra Garrison in NY.

I appreciate also the different kinds and levels and frequencies of
questions (and answers) here.  It reminds me that I don't know
everything and, in fact, that I do not want to.  Our colloquy is a daily
reminder that almost nothing in this field is really a priori obvious.

I should quote something from James Thurbur at this point, but I think
this will do:   http://www.bnl.com/shorts/catbird.html (... and thanks to
them for putting it there.)

Jim