In this episode of Exo, Dr. Chris Mason is using genetics to understand how humans might prepare for —and defend themselves against— life in space.

As one of 10 investigators on NASA’s twin study with Scott and Mark Kelly, Chris examines how the human body changes in space at a molecular level. His quest to map the DNA of microorganisms on Earth and the International Space Station has revealed the vast and alien nature of life as we know it.

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