What's stopping scientists from creating an artificial intelligence? More than 35 years ago, in the noted film classic "2001: A Space Odyssey," writer Arthur C. Clarke and director Stanley Kubrick created a fictional AI that would set a benchmark for a whole real-world industry: the sinister, smooth-talking, omniscient computer HAL. Now, in the year 2001, this program presents some of the key scenes from the epic movie and asks whether such a creature can be constructed in reality. Clarke and experts from across the United States weigh in on the subject of how close science is to reaching that goal.