Unfortunately, the BBC player is blocked for those of us outside the UK.
My brother recently had his DNA done for the purposes of genealogy and it is mind blowing how much we can learn about our ancestors, and how much of human history we have a glimpse of through the information contained in our living cells. I had not even heard of
Denisovans, let alone that we now have a single DNA sample that came from the pinky bone of a 5 year old girl who lived ~40,000 years ago in the area we call Siberia.
Folks - virtually all of us who who ancestors came from outside Africa have 1-4% Neanderthal DNA, and in some cases may have a similar proportion of Denisovan DNA. People who's ancestors have always lived in Africa are 100% homo sapiens.