Obviously one of the two have been replaced by aliens. DOESN'T ANYONE AT NASA WATCH HORROR / SCIENCE FICTION MOVIES?!?!?! Also...why did NASA perform a DNA test on them in the first place? Think about it...
Spending a year in space not only changes your outlook, it transforms your genes. Preliminary results from NASA's Twins Study reveal that 7% of astronaut Scott Kelly's genes did not return to normal after his return to Earth two years ago.
