Coinciding dates are being made to carry an enormously heavy load, there. We do know that up until ~20kya there were millions of square miles of rich river val

Coinciding dates are being made to carry an enormously heavy load, there. We do know that up until ~20kya there were millions of square miles of rich river valley land, now under the sea, that could have supported tens or hundreds of millions population. And, in most of the world, we have no idea how many people lived there throughout most of prehistory, with isolated exceptions.