Now here, in a Darwin’s-God exclusive, our internal research staff now explains this seemingly bizarre phenomenon. We quote from the historian sharp-shooter, none other than Peter Bowler:
To explain human intelligence, Darwin could have called on the progressionists' assumption that this was an advantage that would be boosted by natural selection. But he realized that this assumption begged an important question: why had the human branch of evolution been able to exploit this advantage while the apes had not? He theorized that the difference was brought about by an adaptive change involving a transition from a forest environment to the open plains. Our ancestors had moved out onto the plains and had become fully upright because this was now the best means of locomotion. This had freed their hands from playing a role in locomotion among the trees; thus the hand, with its fully opposable thumb, had developed a much more precise ability to grasp objects, and this consequence of the adjustment to bipedalism indirectly had favored selection for increased intelligence. Our ancestors had developed bigger brains because their hands allowed them to make use of sticks and stones as primitive tools. The apes had stayed in the trees, where their hands continued to be used mainly for grasping branches, and thus had not had the need for additional intelligence. [Evolution: The History of an Idea, p. 213]
Incredible. Darwin was such a genius. Of course, bipedalism is the key. And how did bipedalism come about? By the prairie of course. Rather than being stick-in-the-muds like their ape friends, those venture-some pioneers moved out of the jungles and into the prairies where they became, naturally, fully-upright and much smarter. The rest, as they say, is history. It is all so obvious when you think about it. How brilliant.
The great irony here is that about the time Darwin was putting his brilliant thoughts to paper, Michael Landon and family were actually migrating out of the forest and out onto the prairie. It’s amazing how ironic evolution is—everything just works.