I'm one of the most durable and fervent advocates of space exploration, but my take is that we could do it robotically at far less cost and far greater quantity and quality of results.

Certainly one of the most enthralling things about human life is the recognition that we live in what, for practical purposes, is a universe without bounds.

Our family was very fond of the University of Iowa. We thought it was a good place to go.

I am never as clear about any matter as when I have finished writing about it.

These days, it's really been uninteresting except when disasters occur.

A man is a fabulous nuisance in space right now. He's not worth all the cost of putting him up there and keeping him comfortable and working.

I think we need someone in a responsible political position to have the courage to say, 'Let's terminate human spaceflight.'

Entrepreneur, let your global & generational vision start locally, now.

It was only a sunny smile And little it cost in the giving. But like morning light it scattered the night And made the day worth living.

As long as I can reach somebody, then I feel like I'm doing my job.

I've never been very attached to genre labels and never set out intentionally to write historic fiction. Besides, what you consider historic depends on how far back your memory extends.

Science never gives up searching for truth, since it never claims to have achieved it.

A lot of people wonder how a 21-year-old with average power (I finished 89th in driving distance) can be so successful. The answer is simple: I know how to score.

Fear and pain and suffering is not OK for any being to feel intentionally at the hands of us.

Sacred texts always offend reason.

A management decision is irresponsible if it risks disaster this year for the sake of a grandiose future.

There is in all visible things an invisible fecundity, a dimmed light, a meek namelessness, a hidden wholeness.