In 2010, a small bone fragment of a finger bone was discovered in Denisova cave in the Altai Mountains of Asia. Later genetic analysis indicated that it belonged to a heretofore unknown ancient human species, named Denisovans, and that their DNA is still present in native populations of Australia, New Guinea and surrounding regions. There is a distinct, and puzzling, absence of the DNA in Asian populations. ...Alan Cooper of the University of Adelaide in Australia and Chris Stringer of the Natural History Museum in the UK are suggesting that the DNA presence could be the result of the Denisovans...