Ancestral home of all human beings discovered by scientists

[csziggy]

62. There multiple emigrations out of Africa

From as early as Homo erectus on - or possibly earlier (see https://en.wikipedia.org/wiki/Homo_floresiensis#Classification). As each wave spread, they continued to evolve, creating various strains of hominids, some of which could often still interbreed.

Neanderthals and Denisovans would have been the result of earlier migrations that what we think of as modern humans, possibly the descendants of Homo heidelbergensis (https://en.wikipedia.org/wiki/Homo_heidelbergensis) whose remains have been found in Europe dated over 400,000 years ago.

Studies of skin coloration in humans have shown that it was a gradual change as humans moved farther north and received less UV-B (which stimulates the production of Vitamin D). See https://en.wikipedia.org/wiki/Human_skin_color#Evolution_of_skin_color

I'm using Wikipedia as a source rather than locating the often hard to access scholarly papers. If you want to learn more, follow the links from the Wikipedia articles.

Humans are mutts - as some of the replies to my comment indicate, we have never really had "pure" strains of our species.