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Also by my earliest days, I was fascinated by a utopian vision of what the world could be like. I've thought that science could be the basis for a better world, and that's what I've been trying to do all these years.

I always had this vision of what I wanted to do in life.

One of the most startling events in my life was when my older son was about 16, and he blamed me for all the troubles of the world. So I, I felt like telling him, 'Oh no, I was just like you when I was your age; I wanted to change the world, too.'

When I was in college, I wanted to be involved in things that would change the world.

My grandfather raised me believing in the power of youth to change the world.

Back in those days we thought we could change the world.

A huge change has taken place in my lifetime.

As a young boy, I had strange dreams of affecting people and somehow being instrumental in changing the makeup of Africa and helping to improve life there.

I had a nutty career. I was living in New York. Then I got to an age where my friends and sister were having children, and I started to think I needed to orient myself towards a world where it could happen.

My life has been about big changes.