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November 19, 2009
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Researchers published their findings in the Nov. 20, 2009, issue of the journal Science.
Researchers published their findings in the Nov. 20, 2009, issue of the journal Science.
Credit: Copyright AAAS 2009
Images credited to the National Science Foundation, a federal agency, are in the public domain. The images were created by employees of the United States Government as part of their official duties or prepared by contractors as "works for hire" for NSF. You may freely use NSF-credited images and, at your discretion, credit NSF with a "Courtesy: National Science Foundation" notation.
Additional information about general usage can be found in Conditions.
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