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					Originally Posted by ariel
					
				 
				 The "natives" were doing it for hundreds of years and transmitting the combined knowledge to  their apprentices.  A loss of only one generation would throw  the whole level of expertise back to the beginning.  And that, together with other external  factors you have mentioned, killed the whole tradition. 
			
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 One simple question. Where "lost" this generation?
Moreover, the tradition is usually stored for a long time.