Popular Science - - WEAPONS DETECTIVES -

The Nazis dis­cover through hu­man ex­per­i­ments that Zyk­lon-B—a hy­dro­gen cyanide orig­i­nally in­tended as a dis­in­fec­tant and in­sec­ti­cide—is an ef­fec­tive killer. When ex­posed to oxy­gen, the pel­lets trans­form into a deadly va­por. The Third Re­ich slaugh­ters more than 1 mil­lion Jews with Zyk­lon-B.

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