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Source:
Science Teacher; Apr2009, Vol. 76 Issue 4, p12-13, 2p
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Source:
Science Teacher; Mar2009, Vol. 76 Issue 2, p12-13, 2p
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Source:
Science Teacher; November 2008, Vol. 75 Issue 8, p12-13, 2p
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Source:
Science Teacher; Summer2005, Vol. 72 Issue 5, p8-8, 1p, 1 Color Photograph
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