Neanderthals and so called moderns never interbred.
The climate never changed. Or f it did it took a bazillion
years.
I personally invented the notion that the chromosome
fusion could be a barrier to interbreeding. All the many
cites talking about it were created by me, to cover the
fact that I had only just now came up with this idea.
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https://jtem.tumblr.com/post/704349243109949440
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