There must be something unique about man because otherwise, evidently, the ducks would be lecturing about Konrad Lorenz, and the rats would be writing papers about B. F. Skinner.

Science is the acceptance of what works and the rejection of what does not. That needs more courage than we might think.

The child is not a prisoner of its inheritance; it holds its inheritance as a new creation which its future actions will unfold.

Knowledge is an unending adventure at the edge of uncertainty.

The idea that the universe is running down comes from a simple observation about machines. Every machine consumes more energy than it renders.

The world is made up of people who never quite get into the first team and who just miss the prizes at the flower show.

The most powerful drive in the ascent of man is his pleasure in his own skill. He loves to do what he does well. And having done it well, he loves to do it better.