From the Seattle Post-Intelligencer:
Scientists think they have figured out why pregnant women don’t lose their balance and topple over despite ever-growing weight up front. Evolution provided them with slight differences from men in their lower backs and hip joints, allowing them to adjust their center of gravity, new research shows.
This elegant 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.
Isn’t that amazing? Isn’t evolution smart! You’d almost thing such a difference between men and women, based on their different reproductive roles, was intelligently designed! 🙂