Learning is the process of acquiring new understanding, knowledge, behaviors, skills, values, attitudes, and preferences.
The ability to learn is possessed by humans, non-human animals, and some machines; there is also evidence for some kind of learning in certain plants.
Some learning is immediate, induced by a single event (e.g. being burned by a hot stove), but much skill and knowledge accumulate 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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