I guess what I mean is there are many many amazing applications that I have read about that are supposedly "just around the corner". I am curious to know what, if any scientific impediments there are (i.e. is it just the sheer difficulty of working precisely with subatomic particles that is not yet technologically feasible in a consistent manner yet?) Or is there some other technological or scientific hindrance? I honestly don't know much about the technology just the basic idea, and the premise of using millions of micro-robots to do everything from assemble into self-changing architecture to cell-repairing mechanisms sounds immensely exciting. Are there some specific scientific conundrums blocking this progress (for example missile defense is said to be just extremely difficult to get working mathematically), or is it just a matter of financing, or perhaps legal constraints as you seemed to allude to?Define?
Do you mean nanotechnology as in the nano robots of science fiction?
Or do you mean the use of the nanotechnology we already have?
If you mean the latter, that would be the FDA and other medical oversight commities which won't see our current technology levels in practice for another decade. By then who knows what advancements will be available, and not being used.