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Published on May 17, 2013
NASA Public Affairs Officer Brandi Dean interviews Dr. Jean Sibonga, Bone Lead Human Research Program, about the changes in bone structure and bone loss as a result of long term missions in space and countermeasures such as exercise, diet and drugs to maintain crew health. Questions? Ask us on Twitter @NASA_Johnson and include the hashtag #askStation. For the latest news about the space station, visit http://www.nasa.gov/station.