It is not easy to see how the more extreme forms of nationalism can long survive when men have seen the Earth in its true perspective as a single small globe against the stars.

Science fiction seldom attempts to predict the future. More often than not, it tries to prevent the future.

I don't believe in astrology; I'm a Sagittarius and we're skeptical.

One of the great tragedies of mankind is that morality has been hijacked by religion. So now people assume that religion and morality have a necessary connection. But the basis of morality is really very simple and doesn't require religion at all.

Once you can reproduce a phenomenon, you are well on the way to understanding it.

In all the universe there is nothing more precious than mind.

... chemistry is a trade for people without enough imagination to be physicists.