[SunkenCiv]

...all modern non-African populations contain about 2 percent Neandertal ancestry. This strong universal signal shows that the original Neandertal mixing event must have happened just after the small founding population left Africa.

No it doesn't -- it's more obviously parsimonious to claim that the Neandertals were all over the Earth except perhaps in Africa, or that most of the Earth's population has a Neandertal base (which is true, it's in the DNA) and drove the competing human variety into Africa, or, Africa was uninhabitable for long while and was the last area to be repopulated after the glaciation.

[Cowboy Bob]

I'm confused by these statements. It says that Neanderthals first came from Africa, but there is no Neanderthal DNA in Africans. Were there two separate groups in Africa, who did not commingle?

[ProtectOurFreedom]

…all modern non-African populations contain about 2 percent Neandertal ancestry

That can't be right. I just got my 23 and Me results back and they didn't identify any Neanderthal ancestors. But, now that I look back on it, maybe that's what Dad was saying about his in-laws.

…at most 230-430 generations could have passed since the initial mixing event (dating it around 50-55,000 years ago).

"Honest, ma! Becky and I weren't having sex...we were having an initial mixing event."

[zeestephen]

Re: Or, Africa was uninhabitable for long while and was the last area to be repopulated after the glaciation.

As far as I know, there was almost no glaciation at all on the African continent during the last ice age.

However, 20,000 years ago, there is evidence of extreme drought in northern Africa and the Arabian peninsula and in southwest Africa during the last glacial maximum.

[colorado tanker]

Looks like Sundaland was a hopping place for “mixing events.”

[litehaus]

For Shame! Kicking the “Out of Africa” thing out the window /sarc