Noam Chomsky thought of discrete infinity as the core property of human language but later he somehow changed his own claim. He regards recursion, instead of discrete infinity, as the universal property of human language. Meanwhile, Daniel Everett has researched one of the Amazonian languages, Pirahã and insisted that recursion is not found in Pirahã. Some researchers claim that Pirahã has recursion as other languages do but others think that even if recursion is not employed in the language, it does not mean that recursion is not the universal property of human language. Is recursion the universal property of human language as Chomsky insists?