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 BushTo pursue science is not to disparage the things of the spirit. In fact, to pursue science rightly is to furnish the framework on which the spirit may rise.
Vannevar BushThere has been a great deal said about a 3,00-mile high-angle rocket. The people who have been writing these things that annoy me, have been talking about a 3,000-mile high-angle rocket shot from one continent to another, carrying an atomic bomb and so directed as to be a precise weapon which would land exactly on a certain target, such as a city.
Vannevar BushFear cannot be banished, but it can be calm and without panic; it can be mitigated by reason and evaluation.
Vannevar Bush