One can only prepare for the unpredictable by trying to keep an open and unprejudiced mind — a feat which is extremely difficult to achieve, even with the best will in the world. Indeed, a completely open mind would be an empty one, and freedom from all prejudices and preconceptions is an unattainable ideal. Yet there is one form of mental exercise that can provide good basic training for would-be prophets: Anyone who wishes to cope with the future should travel back in imagination a single life-time — say to 1900 — and ask himself just how much of today’s technology would be, not merely incredible, but incomprehensible to the keenest scientific brains of that time.
1900 is a good round date to choose because it was just about then that all hell started to break loose in science.
-Arthur C. Clarke, from his 1962 essay, Hazards of Prophecy: The Failure of Imagination
If I could remember who set me off on the chase to find this essay, I would thank them
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