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Re:We don't know which species should be classed as 'human' by Sander_Marechal on Monday January 11, 2016 @11:27AM (#10881364)
It makes sense, but how are you going to test that? I'm not sure we are even able to figure out from fossil (DNA) records if various specimens could interbreed.
Re:We don't know which species should be classed as 'human' by BuckRogers on Monday January 11, 2016 @11:35AM (#10881426)
That was my thought too, if I had to venture a guess as prolific as people are, any species that we could have interbred with are already part of us and you'd be able to find it on the genome just as we have neanderthals.

That's probably the best way at this point to test for it, if it's there or not.