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web | Ariana Eunjung Cha | Washington Post | 2015-06-22 | |
web | AFP | 2011-09-22 | ||
web | LiveScience | 2011-08-26 | ||
web | Lauran Neergaard | Associated Press | 2009-07-01 | |
web | Gina Kolata | New York Times | 2006-10-29 | |
web | 2006-09-02 |