“Lighter computers and lighter sensors would let you have more function in a given weight, which is very important if you are launching things into space, and you have to pay by the pound to put things there.”
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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.
If you look at the various strategies available for dealing with a new technology, sticking your head in the sand is not the most plausible strategy.
Nanotechnology will let us build computers that are incredibly powerful. We'll have more power in the volume of a sugar cube than exists in the entire world today.
A molecular manufacturing technology will let us build molecular surgical tools, and those tools will, for the first time, let us directly address the problems at the very root level.