I was wondering if people who lived on Mars could eventually evolve to a state where they are unable to live normally in a human society on Earth? So, I continue, what would have changed? For instance I know their height because of the lower gravity, and the heart being able to pump more blood, but what other effects?
Edit: What I mean is, what are the consequences of people potentially coming back from mars after say, 10 000 years. Also, what traits might they have gotten from living on Mars.