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Look in the iTunes U folder on our Webcourses home page, and navigate to the podcast site. There is also a help file if you are still using Internet Exploder; Firefox, Safari and Chrome work nicely.
This first podcast is a combo podcast covering two big concepts from chapters 2 and 3. Future podcasts will cover other concepts -- right now, I am in fact working on a heat related podcast, similar to Ex, 4.7. Soon it will be ready and available in iTunes U, too.