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When one 's only tool is a hammer , everything looks like a nail . But worse : I had cited two pieces of documentary evidence , one stating explicitly " The gas van Pol 71463 is ready . April 11 , 1942 : a letter from an SS Major-General to the chief of Himmler 's personal staff describes how he has shot all the male Jews he could find , and will soon clear out the camp of women and children with the aid of a " delousing van " ( Entlausungswagen ) . " He 's worked as a professional juggler , a magician 's apprentice and a stand-up comedian . " van Pelt is Professor of Cultural History in the Architecture School at the University of Waterloo in Canada . These results ( Leuchter , Rudolf ) allegedly prove that the materials under examination had not been in contact with cyanide , unlike the wall fragments of delousing buildings in which the revisionists discovered considerable amount of cyanide compounds .