I was reading about this over at a NASA site. They were discussing the amount of genetic mutations occurring in ISS astronauts.
Fireworks in Space: NASA’s Twins Study Explores Gene Expression
Fireworks in Space: NASA’s Twins Study Explores Gene Expression
CNN turned this into a fake news report.
Astronaut’s gene expression changed by year in space
Preliminary results from NASA’s Twins Study reveal that 7% of astronaut Scott Kelly’s genetic expression — how his genes function within cells — did not return to baseline after his return to Earth two years ago.