I continue to find the theory that the human brain developed as a result of upright walking convincing.The "release" of our hands from the need to be involved in basic locomotion allowed--in fact demanded--that we DO something with them! As our dexterity developed, it pushed the language centers and other cognitive functions. Upright walking has its costs--our skeletons are really not "designed" for it and the wear-and-tear is extensive--but it is definitely worth it.
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