Science fiction is not predictive; it is descriptive. Predictions are uttered by prophets (free of charge), by clairvoyants (who usually charge a fee, and are therefore more honored in their day than prophets), and by futurologists (salaried). Prediction is the business of prophets, clairvoyants, and futurologists. It is not the business of novelists. A novelist’s business is lying.
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Valerie Thomas, NASA scientist and inventor (1979)