A world without love is a deadly place.

Real competition can drive up testosterone, which boosts libido.

Romantic love is an addiction.

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.

Scientists know that women gravitate to men who have a different immune system from theirs.

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

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