> In contrast, human children, even with limited vocabulary, could grasp and even invent grammars. The most prominent example would be Nicaraguan Sign Language

> In contrast, human children, even with limited vocabulary, could grasp and even invent grammars. The most prominent example would be Nicaraguan Sign Language, which was spontaneously invented over only a few years by deaf schoolchildren, ages four to sixteen, who had little or no other language.