The secrets of evolution are death and time-the deaths of enormous numbers of lifeforms that were imperfectly adapted to the environment; and time for a long succession of small mutations.

I find science so much more fascinating than science fiction. It also has the advantage of being true.

My wonder button is being pushed all the time.

Books break the shackles of time, proof that humans can work magic.

In more than one respect, the exploring of the Solar System and homesteading other worlds constitutes the beginning, much more than the end, of history.

It is the tension between creativity and skepticism that has produced the stunning and unexpected findings of science.

There is perhaps no better a demonstration of the folly of human conceits than this distant image of our tiny world.