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Teaching Physics Tony 2 15 Jul 13, 2009 12:33PM  
quantum books khashayar 4 47 Jun 30, 2008 02:22PM  
Appropriate Degree of Difficulty HT 2 14 Jul 27, 2007 05:36AM  
why is it wrong or right? Farrokh 0 5 May 24, 2007 11:43AM