How Humans Will Change On Ultra-Long Space Voyages

In the Disney film "Wall-E," a colony of humans becomes an obese population after hundreds of years locked inside a spaceship. A lack of activity and an abundance of food left the starship denizens with little desire to stay in shape. But while "Wall-E" was science fiction, but at least one anthropologist believes the human race will change when it embarks on multigenerational space missions to Alpha Centauri or other nearby stars. To the thinking of Cameron Smith at Portland State Univers...