Okay.
From my perspective there's no question that we have to draw on the existing capabilities. In my view, you're asking not so much a technology question as a policy question, and I'm not really qualified to respond to that.
But from the perspective that there are technologies that currently exist and combinations of existing technologies that require a high level of ingenuity in order to be able to extract even more value from them, absolutely, we do that and we continue to do that. The R and D that we do is quite often to push the boundaries of the limitations of the technology that we know.