This brings up a related question: just how far can Clark hear? I assume that he can hear Lois (Lois especially, because he is tuned in to her voice at a subconscious level) from anywhere in the city, but not from the other side of the world. Whenever I need him to hear of a disaster somewhere else in the world, I have him hear a news report on someone's radio or television. If he really could hear everything in the world a la Superman Returns, he'd have to do some very serious subconscious tuning out.
