Astronaut Twins are NASA's Newest Test Subjects

The only set of astronaut twins are set to become test subjects in an unprecedented NASA investigation into how weightlessness impacts the human body.

No, NASA isn't planning to track the Winklevoss twins on their Bitcoin-funded romp to the edge of space with Virgin Galactic

Rather, NASA will focus on veteran astronaut Scott Kelly, who will embark on a year-long mission to the International Space Station in March 2015, and his identical twin brother, retired astronaut Mark Kelly, who will stay put on on Earth, acting like an experimental control.