Joints Prevent Pregnant Women From Toppling

From Discovery News - Human Interest:

With all that growing weight up front, how is it that pregnant women don't lose their balance and topple over? Scientists think they've found the answer: There's are slight differences between women and men in one lower back vertebrae and a joint in the hip, which allow women to adjust their center of gravity. This elegant evolutionary engineering is seen only in female humans and our immediate ancestors who walked on two feet, but not in chimps and apes, according to a study published in Thursday's journal Nature.

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