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Source:
Science Scope; February 2011, Vol. 34 Issue 6, p10-10, 1p
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Source:
Journal of College Science Teaching; March/April 2010, Vol. 39 Issue 4, p12-12, 1p
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Source:
Science Scope; December 2006, Vol. 30 Issue 4, p12-12, 1p
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Source:
NSTA Reports!; Feb2007, Vol. 18 Issue 6, p20-20, 1/2p
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