Jim ,so you know someone who can tell us the process for asphyxiating hundreds of people at one ( up to 1500 according to holocaust literature ) using an insecticide (zyklon-b) ? Jim , in the 1930s US Customs imported zyklon-b to delouse the clothing and possesions of Mexican migrants coming across our southern border. The Germans used this insecticide (zyklon-b) just for this purpose . To claim that the Germans could use this insecticde to asphyxiate up to 1500 people at one time in some improvised room is hilarious ! To claim that the Germans could asphyxiate one person to death with this insecticide would be technically challenging let alone thousands repeatedley in different locations by constantly alternating personel is NONSENSE !