Today in her lecture Julia mentioned the concept of social classes changing the way bodies look or act.  I don't know if anyone is familiar with or has read The Time Machine by H. G. Wells, but in that book a man travels into the future and learns that the working class has evolved into this sub-human race of monsters that lives underground and eats members of the upper class, who are basically just a bunch of beautiful idiots.  Clearly it's a commentary on how he saw the class system a the time he was writing (1890's I think) and not actually meant to be ho he thought the world would be in a few thousand years.