At 400,000 Years, Oldest Human DNA Yet Found Raises New Mysteries

http://www.nytimes.com/2013/12/05/science/at-400000-years-oldest-human-dna-yet-found-raises-new-mysteries.html?ref=science
Recently, DNA was found that dates back to 400,000 years ago based on the fossil it was found inside.  This new discovery was originally thought to be an ancestor of the Neanderthal, but the DNA results relate the DNA to the Denisovans.  This evidence can change the whole way we look at evolution, as it shows that many different human ancestors have possibly lived on the Earth, many different variations of ancestors may have interbred and relocated.  This can change the whole way we look at evolution.  The bone was extracted through new technology that would not even have been available a year ago.  They were able to drill into the femur and obtain ancient DNA.  Scientists think there is a possibility that we may have to re-think how the homo sapien species came about and spread across the Earth, and figure out our true roots.