Hair that gleams can send a clear sign that you're young and in your prime, whatever your actual age.

A woman of 40 or 50 or 60 can take estrogen replacements, get facelifts, spend her money in bars.

Along with our many human propensities, we evolved a huge cerebral cortex with which we make decisions.

There's all kinds of reasons that you fall in love with one person rather than another: Timing is important. Proximity is important. Mystery is important. You fall in love with somebody who's somewhat mysterious, in part because mystery elevates dopamine in the brain, probably pushes you over that threshold to fall in love.

Keep an open heart. We are wired to find love.

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

The main characteristics of romantic love are craving: an intense craving to be with a particular person, not just sexually, but emotionally.