Scholars of language and linguistics of course, but also researchers in the cognitive, psychological, computer, and mathematical sciences explore recursion in natural language in 20 papers revised from presentations at a conference at Illinois State University in April 2007. They cover the need for recursion on empirical grounds, formal issues, evolutionary perspectives, recursion and the lexicon, and recursion outside syntax. Among specific topics are the fluidity of recursion and its implications, recursion and iteration, just how big natural languages are, a Bayesian exploration of how recursive language is, an evolutionary perspective on clauses that refuse to recur, a proposal for distinguishing the differences between human and non-human animal learners, kinds of recursion in Adyghe morphology, cognitive grouping and recursion in prosody, and recursion in severe agrammatism. Annotation ©2010 Book News, Inc., Portland, OR (booknews.com)