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Language learning thus provides an excellent example of sensitive periods in humans, both for phonology and for grammar. It is also a good illustration of the modularity of the brain: while the grammar and sounds of language freeze,other functions such as the capacity to learn new words and their meanings remain open throughout life. This residual plasticity is precisely what allows us to learn, at any age, the meanings of new words, such as fax,iPad,,meme, and geek, or even humorous neologisms such as askhole(someone who keeps asking stupid, pointless questions) or chairdrobe(that pile of clothes we put>
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