text: The most devastating rebuttal is from the chemist in charge of the Auschwitz analysis , who explains that the gas wouldn 't have penetrated more than 10 microns into the wall ( a human hair is 100 microns thick ) , so by crushing the samples ( standard procedure ) , he had effectively diluted the cyanide 100,000 times .
  
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  The chemist crushed the samples and diluted the cyanide 500,000 times .