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Artificial intelligence. Conceptual illustration of a human head overlaid with binary digits, representing artificial intelligence, the simulation of human intelligence by a machine. Binary numbers, which contain only 1 and 0, form the language of computers. Artificial intelligence is usually taken to mean a computer or machine that can think and learn independently of its original program. (KEYSTONE/SCIENCE PHOTO LIBRARY/MARK GARLICK/SCIENCE PHOTO LIBRARY)