All the earlier changes your race has known took countless ages.

All races use the plant to determine the hours of the day, though each race knows them by a different name.

Some races we know of only by a few scattered stones, which say that man once built something there.

A really sympathetic race would not so much as know the meaning of happiness.

The human race does not know that, and never will.

My race did not know there was anything unusual about us until we left our homeworlds.

We may be entering upon the first true peace the human race has ever known.

Our race knew space travel already one million years ago but this knowledge could not save us from the catastrophe.

Johnson was a dreamer - the greatest our race has ever known.

Any race with a knowledge of space travel should know that, Conway thought.