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Published online by Cambridge University Press: 14 August 2015
The study of infrared sources in molecular clouds necessarily places the practitioner at the interface between two rapidly evolving fields of study. In such a situation, yesterday's heresy often becomes today's dogma. Since it is hard enough to keep up with even one field of study, I thought it might be helpful to recount a bit of history regarding molecular clouds. The objective is to put various notions about molecular clouds into proper context.