[alex201]

IMO it's not that there 'were' multiple species and only we survived; we are still multiple species, but we don't point that out for cultural correctness. Yes, the extent of our differences has narrowed as we passed through survival bottlenecks, but we never became a single species.

[ComplexSystems]

If every human can interbreed with every other and product viable, non-sterile offspring, then how could it possibly be that we aren't one species?

[InitialLastName]

To be pedantic about the fuzziness of the "species" delineation, not every human is capable of producing viable, non-sterile offspring (breeding partner notwithstanding).

[wolverine876]

Do you have anything that will persuade others that we are actually multiple species? I know of no basis for it.

And given no scientific basis (unless I'm wrong), isn't that the reason nobody believes it?

The "cultural correctness" argument seems a rehash of the tired, preconceived argument applied to everything.

[acchow]

Given that there is a single species of human today and most of us have some percentage of Neanderthal DNA, it seems that we are one species today and we were also one species in the past (since we could and did interbreed)

[BlueTemplar]

That is tautologically true, considering how Neanderthal is an offshoot of Sapiens.

The question maybe worth asking is just how far they split off, compared to how far we are split off today (or maybe in the pre-modern era, I would expect us to be merging fast since then).

[calibas]

This is complete bullshit. We've sequenced neanderthal DNA and can tell exactly how much modern people have in common.

If you want to promote some scientifically-accurate racism, the only "pure-blooded" homo sapiens come from central and southern Africa, everyone else is just a little bit neanderthal.

[readthenotes1]

Right? Arthur Clarke has a story in which our long lost cousins finally come to rescue us from the shipwreck millennia ago, and offer also to correct the genetic mutation that reduces skin pigment...

[wkipling]

Bro science at its peak.