Science
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U.S., Russian crew blast off for space station
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Children at risk as "button" battery use grows: study
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Maya lunar calendar notes discovered in Guatemala
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Google-backed wind power line clears hurdle
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Eastern rattlesnake slithers closer to U.S. endangered list
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Scientists spot unseen planet in Kepler scope data
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Scientists urge action on world's biggest problems
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U.S. downs test missile with new interceptor
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Shuttle rocket-builder vying for NASA space taxi work
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U.S. military embraces robots with greater autonomy
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