Of course we're all programmed genetically to some extent. But the "selfish gene" thesis doesn't explain everything.

I love to write - it is a great source of reflection, especially as I continue to meet many new inspiring people.

I got to Africa. I got the opportunity to go and learn, not about any animal, but chimpanzees. I was living in my dream world, the forest in Gombe National Park in Tanzania. It was Tanganyika when I began.

Farm animals feel pleasure and sadness, excitement and resentment, depression, fear, and pain. They are far more aware and intelligent than we ever imagined...they are individuals in their own right.

Without the heart to ground it and open it to who we really can be as human beings, the brain is a very dangerous machine. A machine that is saying: we've got to have economic growth; we've got to have unending economic growth, otherwise societies will collapse. And yet there should be something saying: wait a minute, this isn't going to work.

In what terms should we think of these beings, nonhuman yet possessing so very many human-like characteristics? How should we treat them? Surely we should treat them with the same consideration and kindness as we show to other humans; and as we recognize human rights, so too should we recognize the rights of the great apes? Yes.

The least I can do is speak out for the hundreds of chimpanzees who, right now, sit hunched, miserable and without hope, staring out with dead eyes from their metal prisons. They cannot speak for themselves.