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Earth is a ball that is over 12,000 kilometres in diameter, and if it were modelled into an object the size of a billiard ball, with all its surface unevenness reproduced exactly to scale, the model would be smoother than an ordinary billiard ball—and the ocean would be an all but unnoticeable mist of dampness over 70 percent of its surface.

— Isaac Asimov Exploring the Earth and the Cosmos (1982)

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More quotes by Isaac Asimov

A robot may not injure a human being, or, through inaction, allow a human being to come to harm.

The Three Laws of Robotics (1942)

The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom.

Isaac Asimov's Book of Science and Nature Quotations (1988)

There is no belief, however foolish, that will not gather its faithful adherents who will defend it to the death.

The Stars in Their Courses (1974)

A robot may not injure humanity, or, through inaction, allow humanity to come to harm.

The Three Laws of Robotics (1942)

Science fiction writers foresee the inevitable, and although problems and catastrophes may be inevitable, solutions are not.

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Quote text and notes from Wikiquote: Isaac Asimov (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.