A robot must obey the orders given it by human beings except where such orders would conflict with the First Law. [The Second Law of Robotics]

The human mind works at low efficiency. Twenty percent is the figure usually given. When, momentarily, there is a flash of greater power, it is termed a hunch, or insight, or intuition.

We are all victimized by the natural perversity of inanimate objects...and the assorted human beings who perpetuate and maintain this perversity.

Human beings sometimes find a kind of pleasure in nursing painful emotions, in blaming themselves without reason or even against reason.

It is precisely because it is fashionable for Americans to know no science, even though they may be well educated otherwise, that they so easily fall prey to nonsense.

The world is being Americanized and technologized to its limits, and that makes it dull for some people. Reaching the Moon restores the frontier and gives us the lands beyond.

There is not a discovery in science, however revolutionary, however sparkling with insight, that does not arise out of what went before.