This was discussed in 'Before the Dawn: Recovering the Lost History of Our Ancestors'. I don't remember all the details, but I think it discussed the same resea

This was discussed in 'Before the Dawn: Recovering the Lost History of Our Ancestors'. I don't remember all the details, but I think it discussed the same research as this article: http://news.bbc.co.uk/2/hi/science/nature/701286.stm http://news.bbc.co.uk/2/hi/science/nature/701286.stm