Being a mother is an attitude, not a biological relation.

Sense is never common.

Never worry about theory as long as the machinery does what it's supposed to do.

To get anywhere, or even to live a long time, a man has to guess, and guess right, over and over again, without enough data for a logical answer.

Selfishness is the bedrock on which all moral behavior starts and it can be immoral only when it conflicts with a higher moral imperative.

Most women are damn fools and children. But they've got more range than we've got. The brave ones are braver, the good ones are better - and the vile ones are viler, for that matter.

Many short-sighted fools think that going to the Moon was just a stunt. But the astronauts knew the meaning of what they were doing, as is shown by Neil Armstrong's first words in stepping down onto the soil of Luna: "One small step for a man, one giant leap for mankind."