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        9-13+

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        Part of Evolution Series
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        Walking Tall

        Walking and running upright on two feet as humans do requires some specialized adaptations of the skeleton and muscles. Modern human anatomy has built on the strengths and the weaknesses of a body plan inherited from distant ancestors, giving us an efficient and graceful gait and a range of painful problems from back injuries to fallen arches. From Evolution: "Great Transformations".

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