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$40Scientific American May 1, 2002
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$117Popular Science Jan 1, 1950
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$40Scientific American A Matter of Time Sep 1, 2002
$105Popular Science May 1, 1950
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$105Popular Science Jun 1, 1950
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$105Popular Science Sep 1, 1950
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$105Popular Science Dec 1, 1950
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$105Popular Science Feb 1, 1951
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$40Scientific American Understanding Origins Sep 1, 2009
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$105Popular Science Mar 1, 1951