This entire series from Dr Alice Roberts is superb, but it is the final episode that really blows the mind. Confirmation that DNA of extremely close relatives of the aboriginal populations of Australasia is peppered throughout the Americas, right down to Chile and I believe on the Atlantic coast of Argentina.

Later finds evidence that a tribe in the heart of the Amazon also shares similar DNA and there is no grounds for suspecting that the arrival of these peoples did not pre-date what is no erroneously described as 'native's Americans and 'first' nations peoples by at least several thousand years (when these peoples who originated from Siberia crossed the icy land bridge that existed over the Bering Strait. It was possibly even tens of thousands of years earlier given the knowledge of boat-making that we know the black peoples of Australasia must have had at the time to spread from island to island.

Other highlights in this series and this field in general include:

• that the only human peoples to not have interbred with non-Homo Sapiens are sub-saharan Africans (thereby making them the only racially pure Homo-Sapiens. (This appears to potentially partially explain why this geographic area isn't being hit so hard by Covid-19, which appears to enjoy targeting elements of neanderthal genetic heritage - although studies in that area are at an early stage)

• whilst homo-sapien / neanderthal cross-breeds dominate the present world, historically a third group, homo-sapien / Denisovans cross-breeds were prevalent tens of thousands of years ago and the genetic makeup of indigenous Australians, Melanesians (Fijians) and Papua New Guineans match these populations. Pure Denisovans are believed to have been kicking about at least as late as 14,500 BC.

• from all the above, it is inevitable that homo-sapien / Denisovan cross-breeds made it to the Americas before 'native' American homo-sapien/neanderthal cross breeds.

• these black home sapien / denisovan populations were then marginalised, inter-bred with and usurped by the arrival of what have been called 'native' American in a similar way that the 'native' Americans and so called indigenous populations of Central and South American were marginalised following the arrival of white European homo-sapien / neanderthal cross-breeds. Due to the passage of time evidence of this is limited - we don't know if the colonisation of the Americas by 'native's Americans was similarly aided by the spread of new diseases or if violence and interbreeding will have played the key parts.

And the beauty of DNA means this isn't mere speculation. I'm not into documentaries as much as I should be, but this was top drawer.