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Geelan, D. (2009). Explaining Topics in Physics: an International Video Study. In G. Siemens & C. Fulford (Eds.), Proceedings of ED-MEDIA 2009--World Conference on Educational Multimedia, Hypermedia & Telecommunications (pp. 2541-2546). Honolulu, HI, USA: Association for the Advancement of Computing in Education (AACE).