The article avoids all the interesting technical details. In case you re wondering if this is possible and how much of this is an exaggeration, the title of the research article is "The Landscape of DNA and RNA Methylation Before, During, and After Human Space Travel (Twins Study - Mason) - 09.27.17" https://www.nasa.gov/mission_pages/station/research/experime...
Methylation is an usual process that can be used for enabling and disabling genes expression. It's reversible, somewhat permanent and somewhat inheritable. If you like a bad analogy, it's like making a change in the bios setup of your computer or updating the configuration of the wifi router. It's not a firmware update or a hardware modification. More info: https://en.wikipedia.org/wiki/DNA_methylation
Methylation is an usual process that can be used for enabling and disabling genes expression. It's reversible, somewhat permanent and somewhat inheritable. If you like a bad analogy, it's like making a change in the bios setup of your computer or updating the configuration of the wifi router. It's not a firmware update or a hardware modification. More info: https://en.wikipedia.org/wiki/DNA_methylation