And I thought how sad it was that, for all our sophisticated intellect, for all our noble aspirations, our aggressive behavior was not just similar in many ways to that of the chimpanzees - it was even worse. Worse because human beings have the potential to rise above their baser instincts, whereas chimpanzees probably do not.

Mainly because as women's education increases all around the planet, we find that family size tends to drop.

It was because the chimps are so eye-catching, so like us and teach us so much that my work was recognised worldwide.

They used to ask: "How will this decision that we make today affect our people in the future?" Now we make decisions based on: "How does it affect me, now? How does it affect the next shareholders meeting, three months ahead? How does it affect my next political campaign?"

When I was a child, the African forest sounded like a dream to me, because it was full of animals and it was wild.

What makes us human, I think, is an ability to ask questions, a consequence of our sophisticated spoken language.

Other people have talked about chimpanzees being a window into the past, which I suppose is true, in a way.