| CNN.com delivers up-to-the-minute news and information on the latest top stories, weather, entertainment, politics and more. | Twins study: How one-year mission affected astronaut's health | | What happens to the human body after a year on the International Space station, floating in zero gravity? The Twins Study -- comparing data from before, during and after astronaut Scott Kelly's mission in space with those of his identical twin brother, retired astronaut Mark, back on Earth -- is giving researchers a better idea than ever before. |
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