article_snippet: While Scott (right) is in space, doctors will be studying Mark Kelly (left) and Mark (left) to see how being in space affects the body and behaviors .
article_snippet: Doctors want to see how the space twin's body compares with Mustache-less Mark Kelly (bottom) genetic double on the ground.
article_snippet: In a series of ten investigations, doctors will look at the subtle differences that could occur between the brother on earth and the brother in space.
article_snippet: Experiments will look at physiology, shifts in behavior, decision making and alertness, according to People.
highlights_snippet: NASA administrator said that Scott Kellyfooled all of us'
  Doctors will be studying brothers for the next year to see how space affects the body and behavior .