As identical twins, the brothers are genetically very similar. However, researchers found that while he was in orbit, Scott’s telomeres—the caps on the ends of chromosomes—grew longer than his twin brother’s. Though Scott’s telomeres returned to their pre-flight lengths shortly after he returned to Earth, these results were totally unexpected, since telomeres naturally shrink over the course of one’s life, and the stresses of spaceflight are supposed to accelerate this. At least that was the idea.
Even though Scott’s telomeres miraculously lengthened...
Owen R. Fonorow, Follow #OWENRFONOROW at twitter