Still Trippin' on We Are the World

The scientific confirmation of the Out of Africa theory of human expansion around the planet is every hippie dream come true.  As to we are the world, well, we are.  They've got the genomic science to prove it.  (Ithaka:  We Are All One and We Have the Science to Prove It)

There was some unusual wording to the title of it that 'non-African populations expanded out of Africa' or some such but it's not clear what that means.  Were they African until they stopped across the line and then they weren't African anymore?

We must have been black Africans when we started or we would have got skin cancer and died.  That's simple medical reality.  I can send you some selfies to prove that and the last ones did finally heal ... after a damn month.

I won't presume to know the flow of the human / hominin genome about Africa but we must have become lighter as we took up locations in northern Africa.  As we kept expanding the melanin concentration kept dropping and the interesting part is how the human genome was clever enough in the first place to 'know' it would eventually need genes to drop the concentration of melanin in the skin far below what was needed to keep us alive in Africa where we first started.

It's all the same species of Homo sapiens and who knows how many genes and triggers exist to make us turn out black or white but they weren't getting 'invented' along the way or we wouldn't have been H. sapiens anymore.

Unknown if our resident genomics expert could explain the expansiveness of the human genome in any terms which would be sensible enough (i.e. non-mathematical) for mortals to understand.  It seems quite like the genome would have had to include the full range of possible human expressions (i.e. from black to white and all variations) right from the start so what's the reason for that.  What's the Darwinian pressure in Africa where we started that the genome should some day be able to make white people.

- official limit to my knowledge of genetics -

So ...

"Kumbaya" - Peter, Paul, and Mary

Kumbaya my Lord, kumbaya
Kumbaya my Lord, kumbaya
Kumbaya my Lord, kumbaya
Oh Lord, kumbaya

Someone's singing Lord, kumbaya
Someone's singing Lord, kumbaya
Someone's singing Lord, kumbaya
Oh Lord, kumbayah

Someone's laughing, Lord, kumbaya
Someone's laughing, Lord, kumbaya
Someone's laughing, Lord, kumbaya
Oh Lord, kumbaya

Someone's crying, Lord, kumbaya
Someone's crying, Lord, kumbaya
Someone's crying, Lord, kumbaya
Oh Lord, kumbaya

Someone's praying, Lord, kumbaya
Someone's praying, Lord, kumbaya
Someone's praying, Lord, kumbaya
Oh Lord, kumbaya

Someone's sleeping, Lord, kumbaya
Someone's sleeping, Lord, kumbaya
Someone's sleeping, Lord, kumbaya
Oh Lord, kumbaya
Oh Lord, kumbaya