As I keep writing over and over, science does NOT know all but it is looking and discovering all the time and if you know anything about "early Humans" none of this should be that surprising.
Above: Melanesian children
Pacific Islanders appear to be carrying the DNA of an unknown human species
A third extinct human relative.
Science Alert http://www.sciencealert.com/pacific-islanders-appear-to-be-carrying-the-dna-of-an-unknown-human-species
Hints of an unidentified, extinct human species have been found in the DNA of modern Melanesians - those living in a region of the South Pacific, northeast of Australia.
According to new genetic modelling, the species is unlikely to be Neanderthal or Denisovan - two ancient species that are represented in the fossil record - but could represent a third, unknown human relative that has so far eluded archaeologists.
"We’re missing a population, or we’re misunderstanding something about the relationships," Ryan Bohlender, a statistical geneticist from the University of Texas, told Tina Hesman Saey at Science News.
Bohlender and his team have been investigating the percentages of extincthominid DNA that modern humans still carry today, and say they’ve found discrepancies in previous analyses that suggest our mingling with Neanderthals and Denisovans isn’t the whole story.
It’s thought that between 100,000 and 60,000 years ago, our early ancestors migrated out of Africa, and first made contact with other hominid species living on the Eurasian landmass.
This contact left a mark on our species that can still be found today, with Europeans and Asians carrying distinct genetic variants of Neanderthal DNA in their own genomes.
And that’s not all they’ve given us.
Earlier this year, researchers investigated certain genetic variants that people of European descent inherited from Neanderthals, and found that they’re associated with several health problems, including a slightly increased risk of depression, heart attack, and a number of skin disorders.