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April 18, 2014

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In this frame grab from video provided by NASA, two Russian flight engineers perform maintenance on the International Space Station, Monday, June 24, 2013. NASA said Dec. 11, 2013, it is looking into a problem with a malfunctioning cooling pump on the International Space Station, but there is no immediate danger to the six crewmen on board. Agency spokesman Kelly Humphries says the problem may eventually be serious, but is not an emergency at the moment.

NASA / AP

In this frame grab from video provided by NASA, two Russian flight engineers perform maintenance on the International Space Station, Monday, June 24, 2013. NASA said Dec. 11, 2013, it is looking into a problem with a malfunctioning cooling pump on the International Space Station, but there is no immediate danger to the six crewmen on board. Agency spokesman Kelly Humphries says the problem may eventually be serious, but is not an emergency at the moment.