There is more and more data indicating that there is a biological basis to your political views.

In courtship, who wins and who loses will determine who passes on their DNA to tomorrow.

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.

I don’t think we’re an animal that was built to be happy; we are an animal that was built to reproduce.

It's in our genes, we were built to wander.

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

Romantic love is an obsession. It possesses you. You lose your sense of self. You can’t stop thinking about another human being.