It is in meeting the great tests that mankind can most successfully rise to great heights. Out of danger and restless insecurity comes the force that pushes mankind to newer and loftier conquests.

My feeling is, quite simply, that if there is a God, He has done such a bad job that he isn't worth discussing.

Life originated in the sea, and about eighty percent of it is still there.

The great secret of the successful fool is that he's no fool at all

All the hundreds of millions of people who, in their time, believed the Earth was flat never succeeded in unrounding it by an inch.

Feminine intuition? Is that what you wanted the robot for? You men. Faced with a woman reaching a correct conclusion and unable to accept the fact that she is your equal or superior in intelligence, you invent something called feminine intuition.

Science is a set of rules to keep us from telling lies to each other. All scientists really have is a reputation for telling the truth.