Widowhood provided Mama with a higher form of being. In refusing to recover from my father's death she had discovered that her life was endowed with a seriousness her years in the kitchen had denied her. She remained devoted to this seriousness for thirty years. She never tired of it, never grew bored or restless in its company, found new ways to keep alive the interest it deserved and had so undeniably earned.

Whatever a scientist is doing - reading, cooking, talking, playing - science thoughts are always there at the edge of the mind. They are the way the world is taken in; all that is seen is filtered through an everpresent scientific musing.

No man worth his salt does not wish to be a husband and father; yet no man is raised to be a husband and father and no man would ever conceive of those relationships as instruments of his prime function in life. Yet every woman is raised, still, to believe that the fulfillment of these relationships is her prime function in life and, what's more, her instinctive choice.

Awareness of the self is more acutely at the heart of things than it has ever been before. On the foundation of self-awareness alone rest all our hopes for a new politics, a new society, a revitalized life. If we do not genuinely know ourselves, the void will now, at last, surely rise up to meet us.

You are the instrument of your own illumination.

I once wrote a book on women in science. I realized when I was interviewing them that they were the equivalent of writers, or anyone else who tries to make art out of life. Through science they had reached the expressive.

The memoirist, like the poet and the novelist, must engage the world, because engagement makes experience, experience makes wisdom, and finally it's the wisdom-or rather the movement toward it-that counts.