man goes to the wide river, Ruhlen's Proto-Human speakers would have said Man wide river to goes. However, half of all current languages have SOV order, and historically languages cycle between word orders, so finding evidence of this order in the reconstructions of many families may reflect no more than this general tendency, rather than reflecting a common ancestral form. Criticism Many linguists reject the methods used to determine these forms. Several areas of criticism are raised with the methods Ruhlen and Gell-Mann employ. The essential basis of these criticisms is that the words being compared do not show common ancestry; the reasons for this vary. One is onomatopoeia: for example, the suggested root for 'smell' listed above, *čuna, may simply be a result of many languages employing an onomatopoeic word that sounds like sniffing, snuffling, or smelling. Another is the taboo quality of certain words. Lyle Campbell points out that many established proto-languages do not contain an equivalent word for *putV 'vulva' because of how often such taboo words are replaced in the lexicon, and notes that it "strains credibility to imagine" that a proto-World form of such a word would survive in many languages. Using the criteria that Bengtson and Ruhlen employ to find cognates to their proposed roots, Lyle Campbell finds seven possible matches to their root for woman *kuna in Spanish, including cónyuge 'wife, spouse', chica 'girl', and cana 'old woman (adjective)'. He then goes on to show how what Bengtson and Ruhlen would identify as reflexes of *kuna cannot possibly be related to a proto-World word for woman. Cónyuge, for example, comes from the Latin root meaning 'to join', so its origin had nothing to do with the word 'woman'; chica is related to a Latin word meaning 'insignificant thing'; cana comes from the Latin word for 'white', and again shows a history unrelated to the word 'woman'. Campbell's assertion is that these types of problems are endemic to the methods used by Ruhlen and others. There are some linguists who question the very possibility of tracing language elements so far back into the past. Campbell notes that given the time elapsed since the origin of human language, every word from that time would have been replaced or changed beyond recognition in all languages today. Campbell harshly criticizes efforts to reconstruct a Proto-human language, saying "the search for global etymologies is at best a hopeless