251 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2007-05-04 15:27:58
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252 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2013-10-23 09:54:54
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253 | Add to Reading ListSource URL: www.ncnr.nist.govLanguage: English - Date: 2000-02-29 13:31:29
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254 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2009-11-19 16:32:08
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255 | Add to Reading ListSource URL: www.ncnr.nist.govLanguage: English - Date: 2001-02-27 09:29:53
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256 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2007-05-04 15:37:23
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257 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2007-05-04 15:44:46
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258 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2007-05-04 15:41:04
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259 | Add to Reading ListSource URL: www.kidsciencechallenge.comLanguage: English - Date: 2012-08-18 04:22:33
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260 | Add to Reading ListSource URL: www.aps.orgLanguage: English - Date: 2011-09-26 12:35:39
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