In the classic science-fiction movie Forbidden Planet, space travelers from Earth land on a distant planet, where they encounter the remnants of a technologically advanced civilization. Even though they are not from this distant planet, the space travelers are able to communicate with one of the alien computers. They do this by connecting themselves to glowing head probes. By doing this the space traveler’s thoughts and feelings are directly conveyed to the alien computer over a neural link. In the science-fiction movie The Matrix, the world is run by machines that use humans as batteries so sustain t