Helen Fisher

After a man falls madly in love, he no longer cares how old she is.

Nobody gets out of love alive. You turn into a menace or a pest when you've been rejected.

Romantic love is an addiction.

Experiences shape the brain, but the brain shapes the way we view experiences, too.

Saliva has testosterone and estrogen. When you kiss, you're having a chemical experience.

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.

In general, men are wired to notice obvious signs that convey interest in mating - a warm smile, for example - and ignore other subtleties, like if your lipstick is faded.

Men have a psychological need to show off their courage and strength. When he sees you talking to another guy, that instinct kicks in and he jumps to protect you and prove he's worthy of your love.

Globalization requires taking a broad contextual and long-term view.

It certainly would have been adaptive for ancestral man to have a chubby wife during stressful times of famine. Not only would she have had more calories to burn, and thus more energy and endurance, but since fat stores estrogen, she would have remained fertile for longer.

My hypothesis is that conservative Republicans have very clear values, and when you have that, you're simply more relaxed.

When people tell you to walk a certain way, it's like not thinking of a purple tomato. You can't not do it.