title: Language gap.
authors.forename: I
authors.initials: I
authors.lastname: Davidson
authors.forename: W
authors.initials: W
authors.lastname: Noble
mesh_terms: D000818:Animals; D001106:Archaeology; D001315:Australia; D005075:Biological Evolution; D002250:Carbon Radioisotopes; D005580:Fossils; D015186:Hominidae; D006801:Humans; D007802:Language
chemical_list: D002250:Carbon Radioisotopes