"And of all illumination which human reason can give, none is comparable to the discovery of what we are, our nature, our obligations, what happiness we are capable of, and what are the means of attaining it."

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The question of whether a device will come into being depends upon three things: first, whether there is a practical use for it that warrants its development and manufacturing costs; second, whether the laws of physics applying to the elements available for its design allow the attainment of the needed ranges, sensitivities, or the like; and third, whether the pertinent art of manufacture has advanced sufficiently to allow a useful embodiment to be built successfully.

— Vannevar Bush