The advantages of speaking a second language

Just a few generations ago, speaking two languages was supposed to be bad for you. Tests in America found that bilingual people had lower iqs, which seemed evidence enough. Later it became clear that those surveys were really measuring the material poverty of immigrants; members of such families were more likely to be undernourished and understimulated, not to mention the obvious fact that they often sat the tests in a language that was not their best.

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