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3.1 Demo--show carbon fibers and graphite.
3.2 Demo--picture of graphite mine.
3.3 Demo--Strength of carbon fibers
4.1 Demonstration: Scratching glass microscope slidewith a diamond coated blade; if done on an overhead projector a large class can see the results. Others?
4.8 Demo--Jewellor's slides/tools/etc about how hard diamond is
4.9 Demo-- Some sort of comparison to boulder rolling down a hill?
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