RT> I'm not a scientist, but my understanding is that isotope ratio
 RT> testing is a reliable way to ascertain origin. How 'bout it George???
 Differentiating between human and alien constructed materials?  Surface 
analysis using an electron microscope...perhaps spectral analysis...but you'd 
never be completely sure if it was alien in construction ....isotope ratio 
testing?   Not sure Ron, I know what the name infers, but I get the feeling 
we need to know a great deal of metallurgy to count out human constructions. 
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