[hellbender]

It’s more than just the lack of caves. Bushmen, Andamanese, and other nomadic hunter-gatherers produce hardly any art above ground. They are stuck in the Paleolithic. Remember, these guys can’t even make fire!

[colorado tanker]

I read somewhere that the DNA evidence suggests the first modern humans out of Africa began working around the Indian Ocean coast, so that would fit with the Andaman Islanders, isolated from the continent, being among the oldest DNA types.

There appears to be a lot of work to be done on this subject. It's interesting that at one time in the distant past there was a lot of intermarriage, but that stopped with the advent of the caste system. So, what changed? Why didn't the invaders from the North start a caste system right away?