Two splits between human and chimp lines suggested
18th May 2006
New York Times, May 18 - The split between human and chimpanzee lineages, a pivotal event in human evolution, may have occurred millions of years later than fossil bones suggest, and the break may not have been as clean as humans might like.
http://www.nytimes.com/2006/05/18/science/18evolve.html?pagewanted=print