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8/2/2019 The Weekly Newsmagazine of Science
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http://www.sciencenews.org/pages/sn_arc99/6_26_99/fob2.htm#Referenceshttp://www.sciencenews.org/pages/sn_arc99/6_26_99/content.htm8/2/2019 The Weekly Newsmagazine of Science
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8/2/2019 The Weekly Newsmagazine of Science
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