It's that time of the year when we surround ourselves with witches, ghosts, and goblins. 

While these tropes serve as Halloween decorations, they do tap into our acknowledgement of the supernatural, of forces beyond our physical world that influence our lives. Belief in the supernatural developed into a key trait that allowed us humans to survive, that trait being our ability to control our surroundings, or rather, to exploit our environment to sidestep uncertainty and bring about favorable out...