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Source:
Journal of College Science Teaching; May/June 2011, Vol. 40 Issue 5, p70-74, 5p
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Source:
Science & Children; Jan2006, Vol. 43 Issue 4, p12-13, 2p
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Source:
Journal of College Science Teaching; November/December 2007, Vol. 37 Issue 2, p8-8, 1p
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