if the grammar of a creole is largely the product of the minds of children, unadulterated by complex language input from their parents, it should provide a particularly clear window on the innate grammatical machinery of the brain.

The language that results when children make a pidgin their native tongue is called a creole.

myth that nonstandard dialects of English are grammatically deficient is widespread.

complex language is universal because children actually reinvent it, generation after generation—not because they are taught, not because they are generally smart, not because it is useful to them, but because they just can’t help it. Let me now take you down this trail of evidence.

The best definition comes from the linguist Max Weinreich: a language is a dialect with an army and a navy.

The universality of complex language is a discovery that fills linguists with awe, and is the first reason to suspect that language is not just any cultural invention but the product of a special human instinct.

No mute tribe has ever been discovered, and there is no record that a region has served as a “cradle” of language from which it spread to previously languageless groups.

children develop these complex grammars rapidly and without formal instruction and grow up to give consistent interpretations to novel sentence constructions that they have never before encountered.

virtually every sentence that a person utters or understands is a brand-new combination of words, appearing for the first time in the history of the universe. Therefore a language cannot be a repertoire of responses; the brain must contain a recipe or program that can build an unlimited set of sentences out of a finite list of words.