You are what you do. Visit England and try to walk through Elizabethan house doors without stooping. Visit American western pioneer museums and marvel at the small clothes. Agriculture brought smaller size compared to hunter gatherer folks of the past:
> 
> http://www.sciencedaily.com/releases/2015/05/150518163836.htm
> 
> "Modern lifestyles have famously made humans heavier, but, in one particular way, noticeably lighter weight than our hunter-gatherer ancestors: in the bones. Now a new study of the bones of hundreds of humans who lived during the past 33,000 years in Europe finds the rise of agriculture and a corresponding fall in mobility drove the change, rather than urbanization, nutrition or other factors.
> 
> *****
> 
> "Ruff notes that Paleolithic-style bones are still likely achievable, at least for younger humans, if they recreate to some extent the lifestyle of their ancestors, notably doing a lot more walking than their peers. He cites studies of professional athletes that have demonstrated how lifestyle is written in our bones. "The difference in bone strength between a professional tennis player's arms is about the same as that between us and Paleolithic humans," he says."-Ok, now please tell me I am not the only one that sees this? One of the major claims for separate and distinct hominids is morphological difference in the builds, and yet here it shows that very basic changes in lifestyle produces the same result within the same species. Coincidence?-
Here, is a theory. According to biblical sources, all humanity was wiped out except for a single group of humans. Could it be THAT is why we see the huge difference between modern DNA and fossils?

--
What is the purpose of living? How about, 'to reduce needless suffering. It seems to me to be a worthy purpose.