In this provocative book, six coauthors, representing cognitive psychology, connectionism,neurobiology, and dynamical-systems theory, synthesize a new theoretical framework forcognitive development with special focus on language acquisition. In the Emergentistperspective, interactions occurring at all levels, from genes to environment, give rise to emergentforms and behavior. These outcomes may be highly constrained and universal, but they are notthemselves directly contained in the genes in any domain-specific way. The human bodycontains perhaps 5 × 1028 bits of information in its molecular arrangement,but our genome contains only about 105 bits of information. Thus, we are over 20orders of magnitude short of being mosaic organisms, where development is prespecified in thegenes. Our development is under regulatory control, where precise pathways to adulthood reflectnumerous interactions at the cellular level occurring throughout development. The human cortexis plastic, its architecture reflects experience; innate specification of synaptic connectivity in thecortex is highly unlikely. Theories of language must reflect this—they must bebiologically, developmentally, and ecologically plausible. Linguistic representational nativism isjust not tenable. It is so implausible that UG could be directly encoded in the genotype that wemust explore the alternatives. So the answer is not “Nature.” Nor, as the authors soclearly argue, is it “Nature or Nuture.” Rather, it is “Natureand Nurture.”