Alvin Flummux wrote:
If you gave a human from back then the same education, upbringing and diet modern folks have, would he or she not be indistinguishable from you or I?
Well we can't know, can we? But it's a fascinating question
As to the question: well, we can have a damn good guess. If a human from 40,000 years ago has the same genes as us (and that's where the science points), then we can also assume that a baby born 40,000 years ago would look just like a baby born today. It would have the same genes and develop into a normal child and a normal adult for either era.
The important point is that a baby born today carry genes that prepare it for the life of a hunter-gatherer, which is the occupation of every human that ever lived until the advent of agriculture 10,000 years ago. That's what our blueprint is 'for.' In that era coming across a concentrated source of sugar was a rare event and was a powerhouse store of useful energy -- we're not built for three drinks of sugared water a day and the regular massive spikes in glucose that ensue.