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PBSOctober 1, 2013
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IndependentSeptember 27, 2013
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The GuardianSeptember 24, 2013
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September 23, 2013
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The GuardianSeptember 20, 2013
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Science InsiderSeptember 12, 2013
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Washington ExaminerSeptember 9, 2013
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EE NewsAugust 22, 2013
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August 1, 2013
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July 31, 2013