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Published online by Cambridge University Press: 12 April 2016
We are in a period that is rich with data and ideas, but the collection of ideas is fundamentally incomplete, leaving us with no useful model for the general characteristics of the interstellar medium (Cox 1995). At the same time, we wrestle with tentative models at various levels, and concepts that such synthesis modeling must involve. In the list and commentary that comprise this paper I offer to future explorers what limited wisdom I can.