Very interesting.
NASA study: Astronaut's DNA no longer identical to his identical twin's after year in space
http://thehill.com/policy/energy-en...auts-dna-no-longer-identical-to-his-identical
NASA study: Astronaut's DNA no longer identical to his identical twin's after year in space
http://thehill.com/policy/energy-en...auts-dna-no-longer-identical-to-his-identical