o1. The stuff the Nazis used to exterminate Jews during WWII, as an alternative to the slower-working Carbon Monoxide.

o2. A pretty excellent Death Metal ban, whose album "World ov Worms" I implore you to try out.

or Zyklon B, the German name for a chemical pesticide used in concentration camps Majdanek and Auschwitz. (Zyklon is the German word for Cyclone) First developed by Fritz Haber, then produced as a delousing agent. The first use of Zyklon B in Auschwitz was on 600 Soviet Prisoners of War.

or Zyklon B, the German name for a chemical pesticide used in concentration camps Majdanek and Auschwitz. (Zyklon is the German word for Cyclone) First developed by Fritz Haber, then produced as a delousing agent. The first use of Zyklon B in Auschwitz was on 600 Soviet Prisoners of War.
Zyklon is the chemical agent used to kill many innocent people during the Holocaust.

The stuff that the Nazis used in their concentration camps to gas people to death.