It seems like pure science fiction. NASA astronaut Scott Kelly goes to space for nearly a year, comes back, and suddenly has turned into a mutant with different DNA from his twin. As Newsweek wrote, his DNA "changed in space".
Tagged With bad reporting
It's really not that hard to write a science news story, I promise. Some new scientific results come out, you talk to a scientist on the phone and ask them what they did, then you ask a few other people who know about the research if the results made sense. It's a lot like, well, any other reporting.