11 | Add to Reading ListSource URL: pacificsciencecenter.orgLanguage: English - Date: 2012-04-18 14:09:03
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12 | Add to Reading ListSource URL: astroverde.orgLanguage: English - Date: 2011-12-05 14:17:38
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13 | Add to Reading ListSource URL: www.scienceofeverydaylife.comLanguage: English - Date: 2013-04-09 16:59:08
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14 | Add to Reading ListSource URL: scienceofeverydaylife.comLanguage: English - Date: 2013-04-09 16:59:08
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15 | Add to Reading ListSource URL: observe.phy.sfasu.eduLanguage: English - Date: 2003-04-01 01:21:42
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16 | Add to Reading ListSource URL: www.lehigh.eduLanguage: English - Date: 2010-03-22 17:40:07
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