[Baron von Richthofen (Vaclav)]

Originally Posted by supernova1965

I believe its because we came down from the trees and were able to use our hands more effectively instead of using them for climbing which led to development of our brains. And the reason for walking more upright was when we came out of the trees we had to stand tall to see over the tall grass.

Up to a few months ago I would have agreed with you but a recent find squashed all that, the common ancestry to man and primates walked upright and did not live in trees, primates developed independently like man, so man has never climbed out of the trees and always walked upright
It was on the news about 6 weeks ago