Linguistics is the study of how people use language. Its subfields include psycholinguistics, sociolinguistics and anthropological linguistics. A famous figure in the field of linguistics is Noam Chomsky, who was the first to suggest that there is a universal grammar intrinsic to all languages and innate to humans. Linguistics traditionally includes the study of grammar, semantics, syntax and phonology. The history of linguistics dates back to ancient Greece, but it was not until the nineteenth century that linguistics was elevated to a science.