"The human race is just a chemical scum on a moderate-sized planet, orbiting around a very average star in the outer suburb of one among a hundred billion galaxies."

"I think that the human race has a great future ahead of it, if we can just learn to cooperate."

"We are in danger of destroying ourselves by our greed and stupidity."

"The downside of my celebrity is that I cannot go anywhere in the world without being recognized. It is not enough for me to wear dark sunglasses and a wig. The wheelchair gives me away."

"The past, like the future, is indefinite and exists only as a spectrum of possibilities."