This moron wrote a book about 'his' thoughts on what people living on Mars would experience. This guy apparently interviewed people from NASA and SpaceX...he claimed that the people, over several generations, would grow to be smaller and shorter. Apparently after all of the 'research' he's done he doesn't understand how gravity works and how lower gravity or zero gravity environments affect human body. The reverse most likely will happen due to Mars's gravity which is about 38% of Earth's. I really dislike these so called 'experts', its some douche trying to monopolize on current events and just spewing bullshit.