The very fact that H.n.s. and H.s.s. could breed very likely means they weren't separate species anyway - and serves as a good case study for the troubles with the term "species".<p>As if that weren't enough, the same can also be said of Denisovans.<p>Another cool thing is gene testing companies (rarer these days), like 23andme, can give you an estimate of how much Neanderthal DNA you have, and it was how I learned that I have a little more H.n.s. DNA than was average by more than a standard deviation.