Haiti is the poorest country in the western hemisphere; some say the poorest in the world.

Kissing is not just kissing. It is a major escalation or de-escalation point in a powerful process of mate choice.

Women's worst invention was the plow. With the beginning of plow agriculture, men's roles became extremely powerful. Women lost their ancient jobs as collectors.

Women, it turns out, are built to lead - particularly in the modern world.

Good-looking people are always looking for other good-looking people.

Women spend their lives trying to look good for men. So a woman who feels she's sending the right visual signals is pleased with herself.

When chimps threaten, they open their mouth and show their teeth. It's a little like waving a knife in front of you. It's very primitive, and therefore bizarre.