If I ran a school, I'd give the average grade to the ones who gave me all the right answers, for being good parrots. I'd give the top grades to those who made a lot of mistakes and told me about them, and then told me what they learned from them.

Consisting mostly of recirculating scrapped metals, 80% of all the metals that have ever been mined are still at work.

Television is the third parent.

We were deliberately designed to learn only by trial and error. We're brought up, unfortunately, to think that nobody should make mistakes. Most children get de-geniused by the love and fear of their parents - that they might make a mistake. But all my advances were made by mistakes. You uncover what is when you get rid of what isn't.

Coping with the totality of Spaceship Earth and universe is ahead for all of us.

Children will draw pictures with everything in them...houses and trees and people and animals...and the sun AND the moon. Grown-up says, "That's a nice picture, Honey, but you put the moon and the sun in the sky at the same time and that isn't right." But the child is right! The sun and moon are in the sky at the same time.

War is the ultimate tool of politics.