Results show the human body changes, but not dramatically.
Not much can be said yet of the differences between the identical twins’ genetic makeup
Mark Kelly mocks Scott Kelly over space gardening abilities
Mark and Scott Kelly are giving scientists a unique look at what space does to the human body
He spent a year in space, but the fun's not over yet
Coverage begins Tuesday at 4:15 PM Eastern
Above the planet of the apes
Twins Mark and Scott Kelly are key to understanding how space impacts our bodies
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