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“I want to build a billion tiny factories, models of each other, which are manufacturing simultaneously¡­ The principles of physics, as far as I can see, do not speak against the possibility of maneuvering things atom by atom. It is not an attempt to violate any laws; it is something, in principle, that can be done; but in practice, it has not been done because we are too big.”
― Richard P. Feynman