Thanks Beags. Interesting hypothesis ....
"This is a hypothesis; we haven't proved it but it would explain multiple features of our data," said David Reich, assistant professor of genetics at the Harvard Medical School and an author on the Nature paper.
"The hypothesis is that there was gene flow between the ancestors of humans and chimpanzees after their original divergence.
"So, there might have been an original divergence and a separation for long enough that the species became differentiated - for example, we might have adapted features such as upright walking - and then there was a re-mixture event quite a while after; a hybridisation event," he told the Science in Action programme on the BBC World Service.
... based on a huge presupposition, though.
The trouble is, when journalists write these stories, there is an unwritten/unspoken collusion between them and the scientists that they're writing about that man and chimp share a common ancestor. This belief is so ingrained into our pysches now, that no-one ever questions it.
And let's face it, which journalist wouldn't want to be the first with the breaking story that the common ancestor had been found? And which scientist wouldn't want to be the first to discover it, and have his picture on the front page?
When I was a journalist, I would know, even lbefore leaving the building to do the first interview, what the headline was going to be. This was decreed by my editor - who had no idea what I was going to find in my research. But they knew the story they wanted. It's the same when scientists do research. They can only get funding if their research is based on certain accepted given articles of faith, so that the result will fit the agreed narrative.
Usually, if a scientist is looking for something - anything! - they find it. Yet in 150 years of buckets of money, time and resources being poured into research to support Darwin's theories, they still haven't found the common ancestor...what does that tell us?
We can carry on having faith in this - like the fundies have faith in their story - or we can start doing some thinking of our own.