 Russell Gray and his colleagues have taken powerful phylogenetic methods that were developed by biologists to investigate molecular evolution, and applied them to linguistic data in order to answer questions about the evolution of language families. For example, Gray and Jordan (2000) used a parsimony analysis of a large language data set to adjudicate between competing hypotheses about the speed of the spread of Austronesian languages through the Pacific. More recently, Greenhill et al. (2010) used a NeighbourNet analysis to evaluate the relative rates of change in the typological and lexical features of Austronesian and Indo-European. These results bear on hypotheses about the relative stability of language types over lexical features of those languages, and how far back in time that stability extends. If there were highly conserved typological and lexical features, then it might be possible to identify relationships between languages that date beyond the 8000 (plus or minus 2000) year limit that is imposed by lexical instability.