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POPSMake Connections Authors create learning modules that teachers can build into courses or larger units. The module is conceptually larger than a Wikipedia entry, but this site and Wikipedia share the same spirit. A neat place.
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POPSVisualizing weblog conversations If time is left to right, it's not clear how author 1 (top, green rectangle at left) can join a conversation with author 2 (next one down, left-most red rectangle) that started later. Not at all easy to understand this viz when you get down to the details.