17:3617:36, 24 January 2008diffhist+229
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Platonic solid
I added two links to demonstrate 8th grade-made elaborate polyhedral models and teacher instructions for creating the models.
16:1116:11, 19 November 2007diffhist+860
Clock angle problem
This is a paper only about time-angle relationships in an analog clock. It is exactly the topic that is discussed but in more detail and depth.