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  • Spacewalkers finish crucial station repairsadd to reading list  

    Posted on December 24, 2013 at 12:57 PM

    Updated Tuesday, Dec 24 at 3:01 PM

    Nearly two weeks after a faulty coolant valve crippled the International Space Station, two NASA astronauts took on a tricky Christmas Eve spacewalk to get things back to normal.

    By NBC News
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