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    The Kelly twins: The human body in space

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The Kelly twins: The human body in space

Astronauts Scott and Mark Kelly went through a year of experiments -- one in space, one on Earth. Their sacrifice is unraveling the mysteries of the body.

The Kelly twins: The human body in space

Astronauts Scott and Mark Kelly went through a year of experiments -- one in space, one on Earth. Their sacrifice is unraveling the mysteries of the body.