Sclera other species share, but also to the fact that the human iris is relatively small and comprises a significantly smaller portion of the exposed eye surface compared to other animals. It is theorized that this adaptation evolved because of our social nature as the eye became a useful communication tool in addition to a sensory organ. It is believed that the conspicuous sclera of the human eye makes it easier for one individual to infer where another individual is looking, increasing the efficacy of this particular form of nonverbal communication. Animal researchers have also found that, in the course of
The Human Factor (2002 The Outer Limits) all of the human race (including Ward's wife and daughter). The US President's spaceship, with the few remaining people, will arrive in several months. At this point Ward, having lost faith in life and his humanity, reactivates both Link and the self-destruct sequence and starts his last game of chess. When Link asks what has happened, Ward replies: "It was... human error." The Human Factor (2002 The Outer Limits) "The Human Factor" is an episode of the television show "The Outer Limits". It first aired January 11, 2002, in the show's seventh season. This episode is a clip show. Clips