Nature reports Astronaut twin study hints at stress of space travel "Preliminary results are in from NASA’s unprecedented twin study — a detailed probe of the genetic differences between astronaut Scott Kelly, who spent nearly a consecutive year in space, and his identical twin Mark. Measurements taken before, during and after Scott Kelly’s mission reveal changes in gene expression, DNA methylation and other biological markers that are likely to be attributable to his time in orbit."
We don't have a lot of details yet, but apparently the findings are interesting.
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