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If you were to trace human evolution backward in time and space, you'd eventually end up in Africa. There, millions of years ago, animal species evolved to walk upright on two legs and spend more of their lives on the ground than in the trees.

Human infants start life with ape-like brains. Now scientists are saying that the parts of the brain that develop the most during childhood are the exact same parts that changed most dramatically when apes evolved into humans.