Caedes,
While it seems we agree, I think you misunderstood what I was saying, and perhaps the clarity of my post suffered from what may have been over-eagerness to make a point. You said:
"No, our definition is that the supernatural cannot be measured in any way. As soon as a measurement can be made of a supernatural force then it becomes natural by definition. It could be argued that merely our scientific techniques are inadequate but since no-one can come up with an experiment to even prove the existence (never mind measure them) of supernatural forces then it not arrogant to assume they do not exist."
The point of my statements regarding natural/supernatural was not to debate whether "supernatural" events actually occured, which I did state (though I can see how it could have been read in a way not intended), but really that the definition "supernatural" was in itself inappropriate at all times, because the word is merely a reflection of our lack of understanding regarding the true scope of the natural world. As you correctly pointed out, we may simply lack the techniques to prove or disprove something that someone may be referring to as "supernatural".
My point is that it is arrogant to presume that we are qualified to attach a label of "natural/supernatural" to anything. We should recognize that if it is exists in this universe it is simply "natural" and that our own understanding/"techniques" are what require adjusting and reclassification. Case in point, in analysis your own statement quoted above, we do not have the ability to "measure" many aspects to the universe at the particle level, and we have yet to create many of the "scientific techniquies" to explain many of the things we assume to be there. Looking at your own statement above, if what you say is correct regarding the line between natural/supernatural, these particles would then qualify as "supernatural", correct? Of course we both know that that is not the case. So it goes far beyond that...but either way, the use of the term "supernatural" is inappropriate at all times, because it really is just a flawed attempt to arrogantly explain something we have no explanation for. It's an intellectual cop-out. Instead of labeling something as "supernatural", what we should be doing is acknowledging via our use of language that our lack of understanding is a reflection of our own shortcomings, and this "supernatural" phenomina is just as "natural" as the next thing...
I personally feel that the same is true regarding assigning labels of "artificial" to forms of life, whether we are attaching the label to ourselves as a lifeform or any other. We know so little about what constitutes life in the first place that for us to attempt to attach some narrow or vague label to one form as opposed to another is premature at best, and we would be arrogant to attempt to do so.