The link above proposes four waves, but doesn’t clarify how the 2nd, 3rd and 4th waves affect the genetics of modern humanity.
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The link below is the one that focuses on the first wave being the ultimate source of all modern humans.
The NYT’s and your titles (as well as your “all modern humans”) seem racist, given that the ancestors of some Africans never migrated. Other Africans migrated (some against their will) much later.
Aren’t they modern humans as well?
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Note that the claim is that all non-Africans derive from a single wave of migration out of Africa – except for the parts of their genome that descend from an earlier wave of migration. I find it a little amusing that the contribution from Neanderthal and Denisovan ancestors is now so well known that it can be treated as background knowledge.
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