There are two principal explanations about the spread of man. The multi-regional theory holds that Homo sapiens developed among Homo erectus groups in several parts of the world at more or less the same time, perhaps as advanced newcomers drifted in and added their genes to the local gene pool. The concept that would help explain differences in appearance between, say, Asians and Africans.

The other theory, known as the "Out of Africa" (Eve) hypothesis, holds that Homo sapiens evolved in one area of Africa about a quarter of a million years ago, and gradually spread throughout the world, eventually replacing Homo erectus everywhere without considerable interbreeding. (Presumably the more artful and language-prone Homo sapiens simply out-competed the earlier model, leading to Homo erectus's extinction.)

Petit, Charles. "Primitive Species May Have Lived Among Modern Humans." San Fransisco Chronicle. 16 Dec 1996, Final ed.: A, 4.

The only thing that is going for the Eve hypothesis is fresh research being done. At first, the Wilson group came up with a date of 140,000 to 280,000 years as the approximate age of "Eve". Though, the process by which they determined the sequences

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