Single man ancestor, Adam? Or Noah?
Anyway. The whole out of Africa theory is a little bit off the mark, since it uses current data and doesn't calculate or correctly extrapolate the exact condition of the past.
Suffice to say. If you give people a few thousands years or maybe even just a few hundred years or even just plain a few decades, they can literally move everywhere, they don't necessary need a land bridge either. That would mean our single ancestor can literally start anywhere, Africa, Asia, America, Europe, Australia, and so on.
The D.N.A. research only proves the single ancestor thing, it doesn't say on where the ancestor first originated.
As for the whole out of Africa thing.
As I recall, it's said that Africans has more variations in their genetic codes than the overall human beings, this make some people think that humans are from Africa, because they're just a derivation of Africans.
Possible.
Though this doesn't necessary means that the rest of humans came from Africa.
In the contrary, it might be instead that, Africans might have gotten a different set of genetic codes from outsiders, they might have mingle around with people that have different genetic codes. While the rest of the humans tend to stick only with their own kinds / families (though I'm sure these days, if you do that, you probably be labeled as a 'racist').
Besides, Africans' ancestors might not necessary live in Africa in the first place. A few thousands years is too a long of a time to hang around in just one place.
Commonality of the rest of humans = "ABCDEFGHIJ"
Africans = "ABCDEFGHIJ???傭?Ԃ????A??????? ???B?u?qDaqmeypat"
Notice on how I used a lot of different characters.
Anyway. A MSZ-006 Zeta Gundam with a MS-06 Zaku II's head (or what ever) that doesn't mean that the RX-78-2 Gundam was derived from that type, though with using the out of Africa theory, the RX-78-2 Gundam is a derivation of the MSZ-006 Zeta Gundam with a MS-06 Zaku II's head. Okay, you think by yourself on how sensible the theory that RX-78-2 Gundam is a derivation of the MSZ-006 Zeta Gundam with a MS-06 Zaku II's head. And no, a Zeta Gundam with a Zaku head sure ain't pretty.
As for the years thing.
I don't think that it's quite correct to use an exact number of years and so on.
Since things can look old or even new, according to the conditions of their surrounding and the effects that they receives.
After all, that's why toys collectors then seal many of their collections in the originial conditions. And new toys can look old if they are played a LOT.
A 60.000 years old calculation might have been easily be 6.000 years, 4.000 years, 2.000 years, 600 years, 60 years, 6 years, and so on. What is dated 60.000 years in one place, another artifact in another place from the same period could have been dated a totally different number of years.
Anyway. Some people said that the Toba volcano exploded around 75.000 years ago, could it be that it would be had something to do with our single ancestor?
Anyway. One of of the problems of saying that we are evolves from homo erectus and so on, it's like saying that if you let some time after Amuro Ray exist, he or his descendants would evolved into Kira Yamato.
No. Amuro, Camille, Hiiro, Kira, and so on are different inviduals with different stories and with different growth cycles. It's correct that there's a derivation of some sort, but it's not like they're the same individual that kept changing their shape (like Dr. Who).
There are people in the past, and they had their own each story, now it's our turn to play in our own story. But made no mistake, they might not be our ancestors.