The laws of physics should allow us to arrange things molecule by molecule and even atom by atom and at some point it was inevitable that we would develop a technology that would let us do this.
The moment of drifting into thought has been so clipped by modern technology. Our lives are filled with distraction with smartphones and all the rest. People are so locked into not being present.
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If you think the technology is infeasible you don't worry about what it might do and what its potential is.