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Learning is the process of acquiring new or modifying existing knowledge, behaviors, skills, values, or preferences. Evidence that learning has occurred may be seen in changes in behavior from simple to complex. The ability to learn is possessed by humans, animals, and some machines, and there is also evidence for some kind of learning in some plants. Some learning is immediate, induced by a single event (e.g. being burned by a hot stove), but much skill and knowledge accumulates from repeated experiences. The changes induced by learning often last a lifetime, and it is hard to distinguish learned material that seems to be "lost" from that which cannot be retrieved.
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