The chimps' way of aggression is quick and brutal. I compare them to gang attacks.

It's easy to become hopeless. So people must have hope: the human brain, the resilience of nature, the energy of young people and the sort of inspiration that you see from so many hundreds of people who tackle tasks that are impossible and never give up and succeed.

Chimps act the way they feel unless they are afraid of reprisal if they do so. But that doesn't apply to humans.

I learnt from Flo how to be mother. Flo was patient, tolerant. She was supportive. She was always there. She was playful. She enjoyed having her babies, as good mothers do.

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

Be assured that our individual actions, collectively, make a huge difference.

If you consciously say 'I won't do it!' to yourself, then you have a good chance that you won't.