Ooo, evoluntionary neatness!

Ooo, cool. Scientists, those smarties. have figured out why pregnant women are able to adjust their center of gravity to accommodate the load they're carrying.

Harvard anthropology researcher Katherine Whitcomb found two physical differences in male and female backs that until now had gone unnoticed: One lower lumbar vertebrae is wedged-shaped in women and more square in men; and a key hip joint is 14 percent larger in women than men when body size is taken into account.

The researchers did engineering tests that show how those slight changes allow women to carry the additional and growing load without toppling over — and typically without disabling back pain.

Oh, evolution. You're almost always looking out of us.