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Source:
Science; 6/24/2005, Vol. 308 Issue 5730, p1890-1892, 3p
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Source:
Teaching Pre K-8; Apr2005, Vol. 35 Issue 7, p18-18, 2/3p
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Source:
Science; 12/20/2002, Vol. 298 Issue 5602, p2358-2361, 4p, 4 Color Photographs, 2 Graphs
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Source:
Australian Science Teachers Journal; Mar1996, Vol. 42 Issue 1, p49, 6p, 9 Black and White Photographs
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