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Because they allowed themselves to be subjects in an unprecedented long-term experiment on the effects of space on the human body. Since they are identical twin
by akeck 7y ago
Because they allowed themselves to be subjects in an unprecedented long-term experiment on the effects of space on the human body. Since they are identical twins, one is a near perfect control for the other who stayed in space. Unfortunately, it's not looking good for people traveling in space over long periods.