160 1 objective key. student's book with answers-2013, 2nd -198p

The document discusses the history and development of artificial intelligence over several decades. Early research focused on symbolic approaches using rules and logic but progress was slow. More recently, machine learning techniques such as deep learning have seen increasing success by learning from large amounts of data without being explicitly programmed. These new approaches have achieved human-level performance on some tasks but full human-level AI remains an ongoing challenge.