21 | Add to Reading ListSource URL: www.nasa.govLanguage: English - Date: 2014-01-27 15:06:33
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22 | Add to Reading ListSource URL: openinnovation.berkeley.eduLanguage: English - Date: 2012-01-26 15:25:34
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23 | Add to Reading ListSource URL: science.house.govLanguage: English - Date: 2014-04-09 11:39:12
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24 | Add to Reading ListSource URL: www.topcoder.comLanguage: English - Date: 2011-12-13 10:19:08
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25 | Add to Reading ListSource URL: pages.stern.nyu.eduLanguage: English - Date: 2011-05-03 00:35:11
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26 | Add to Reading ListSource URL: www.cs.purdue.edu- Date: 2007-05-25 13:52:34
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