@CNN: 7% of astronaut Scott Kelly’s genes did not return to normal after his return to Earth two years ago, according to preliminary results from NASA’s Twins Study https://t.co/aG3DcfsEIE https://t.co/rzgtJNc3zk

@CNN: 7% of astronaut Scott Kelly’s genes did not return to normal after his return to Earth two years ago, according to preliminary results from NASA’s Twins Study https://t.co/aG3DcfsEIE https://t.co/rzgtJNc3zk