Men tend to be hierarchical, but women are driven to make lateral connections so they can cooperate.

Falling in love was not really a choice; it just struck me.

As a group, anthropologists are not too fond of people who work in the business world.

The only people you and I are likely to know in common are people in the news - politicians, journalists and celebrities.

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.

People have often asked me whether what I know about love has spoiled it for me. And I just simply say, 'Hardly.' You can know every single ingredient in a piece of chocolate cake, and then when you sit down and eat that cake, you can still feel that joy.

People live for love. They kill for love. They die for love. They have songs, poems, novels, sculptures, paintings, myths, legends. It's one of the most powerful brain systems on Earth for both great joy and great sorrow.