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 BushA belief may be larger than a fact. A faith that is overdefined is the very faith most likely to prove inadequate to the great moments of life.
Vannevar BushI say, technically, I don't think anyone in the world knows how to do such a thing. and I feel confident it will not be done for a very long period to come. I think we can leave that out of our thinking. I wish the American public would leave that out of their thinking.
Vannevar Bush