NASA’s Twins Study will tell us how space changes the human body: NASA sent one identical twin to space for a year, while the other stayed on Earth. Preliminary findings show changes in body mass, cognition, the immune system, and hundreds of gene mutations.

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NASA’s Twins Study will tell us how space changes the human body: NASA sent one identical twin to space for a year, while the other stayed on Earth. Preliminary findings show changes in body mass, cognition, the immune system, and hundreds of gene mutations.