Understanding how DNA transmits all it knows about cancer, physics, dreaming and love will keep man searching for some time.

I'm always impressed with what young people can do before older people tell them it's impossible

Politics is democracy's way of handling public business. We won't get the type of country in the kind of world we want unless people take part in the public's business.

There are many ways to salvation, and one of them is to follow a river.

If you want to get people off drugs, improve reality.

Polite conservationists leave no mark save the scars upon the Earth that could have been prevented had they stood their ground.

I sort of kept my hand in writing and went to work for the Sierra Club in '52, walked the plank there in '69, founded Friends of the Earth and the League of Conservation Voters after that.