It's the rare paper that will teach me something new about cosmology, but this paper recently listed at LearnScope did. Specifically: "the curvature of our universe could be measured by examining how pi varies as larger and larger circles are drawn within it." Brilliant! Anyhow, this paper describes and explains the model used to organise, sequence and deliver the Cosmology Distinction Course to highly gifted and talented senior secondary school students in Australia. You'll find many nuggets in this item, including one that shows that discussion list chit-chat preceeds serious interaction. Ignore the publication date; it's wrong (there are references from 1999) and the paper is worth reading anyway.
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