We know how to train the brain of a human being to learn physics (well not always), but that doesn't means that we understand how that brain really works.
The life if full of examples of things we know how to use but that we don't understand. Sometimes it's just impossible to control that things. Think in the stock market or economics. Chemist has been studying this type of things for centuries and you can see the result: there are chemical products everywhere you look.
What the post attack is the concept of creating nanomachines that doesn't degrade (Cosmic rays! oxidation! temperature!!) and do exactly what we want.
And about the "artificial DNA", it's something so simple... Really! the problem is in the emergent properties of DNA, proteins and environmental effects, this is where you loose control. Even nature has problems with that, life forms die, had cancer...
And we can think too, and you can see where is AI in that moment. :)
And ducks can fly with flexible wings.
And the Sun is a thermonuclear reactor.
You can find demonstrations of this type of things everywhere, that doesn't means that we can make them work with our materials, techniques and knowledge.
Nanotech seems to my like AI, always there, at just two steps... that's the type of problems that smell to vaporware from miles.
Somebody said that the reason there is no progress in AI is that once a problem domain is understood well enough that there are working applications in it, nobody calls it AI any longer.
The life if full of examples of things we know how to use but that we don't understand. Sometimes it's just impossible to control that things. Think in the stock market or economics. Chemist has been studying this type of things for centuries and you can see the result: there are chemical products everywhere you look.
What the post attack is the concept of creating nanomachines that doesn't degrade (Cosmic rays! oxidation! temperature!!) and do exactly what we want.
And about the "artificial DNA", it's something so simple... Really! the problem is in the emergent properties of DNA, proteins and environmental effects, this is where you loose control. Even nature has problems with that, life forms die, had cancer...