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Source:
Science World (Teacher's Edition); 1/23/2012, Vol. 68 Issue 8, pTE1-TE8, 8p
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Source:
Academic Questions; Spring2002, Vol. 15 Issue 2, p79, 6p
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Source:
Science Scope; Dec2015, Vol. 39 Issue 4, p80-80, 1/3p
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